Journal articles: 'High frequency sound'

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Harusawa, Koki, Yumi Inamura, Masaaki Hiroe, Hideyuki Hasegawa, Kentaro Nakamura, and Mari Ueda. "Measurement of very high frequency (VHF) sound in our daily experiences." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 2 (August 1, 2021): 4275–82. http://dx.doi.org/10.3397/in-2021-2647.

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Recently, it is frequently reported that very high frequency (VHF) sounds are emitted from daily necessaries such as home electric appliances. Although we measured VHF sounds from home electric appliances in our previous study, the origins of such VHF sounds have not yet been identified. In the present study, we tried to identify the VHF sound source in each home electric appliance using a "sound camera", which visualizes the spatial distribution of the sound intensity using a microphone array. The sound camera visualized the location of the sound source at frequencies from 2 to 52 kHz with a field of view of 63 degrees. The sound camera elucidated that the VHF sounds were emitted from the power source of a LET light, the ventilation duct of an electric fan, and the body of an IH cooker. Their frequency characteristics were dependent on the sound source, i.e., combinations of pure tones in the LED light and distributing in a wide frequency range in the electric fan.

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Oohashi, Tsutomu, Emi Nishina, Manabu Honda, Yoshiharu Yonekura, Yoshitaka Fuwamoto, Norie Kawai, Tadao Maekawa, Satoshi Nakamura, Hidenao Fukuyama, and Hiroshi Shibasaki. "Inaudible High-Frequency Sounds Affect Brain Activity: Hypersonic Effect." Journal of Neurophysiology 83, no. 6 (June 1, 2000): 3548–58. http://dx.doi.org/10.1152/jn.2000.83.6.3548.

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Although it is generally accepted that humans cannot perceive sounds in the frequency range above 20 kHz, the question of whether the existence of such “inaudible” high-frequency components may affect the acoustic perception of audible sounds remains unanswered. In this study, we used noninvasive physiological measurements of brain responses to provide evidence that sounds containing high-frequency components (HFCs) above the audible range significantly affect the brain activity of listeners. We used the gamelan music of Bali, which is extremely rich in HFCs with a nonstationary structure, as a natural sound source, dividing it into two components: an audible low-frequency component (LFC) below 22 kHz and an HFC above 22 kHz. Brain electrical activity and regional cerebral blood flow (rCBF) were measured as markers of neuronal activity while subjects were exposed to sounds with various combinations of LFCs and HFCs. None of the subjects recognized the HFC as sound when it was presented alone. Nevertheless, the power spectra of the alpha frequency range of the spontaneous electroencephalogram (alpha-EEG) recorded from the occipital region increased with statistical significance when the subjects were exposed to sound containing both an HFC and an LFC, compared with an otherwise identical sound from which the HFC was removed (i.e., LFC alone). In contrast, compared with the baseline, no enhancement of alpha-EEG was evident when either an HFC or an LFC was presented separately. Positron emission tomography measurements revealed that, when an HFC and an LFC were presented together, the rCBF in the brain stem and the left thalamus increased significantly compared with a sound lacking the HFC above 22 kHz but that was otherwise identical. Simultaneous EEG measurements showed that the power of occipital alpha-EEGs correlated significantly with the rCBF in the left thalamus. Psychological evaluation indicated that the subjects felt the sound containing an HFC to be more pleasant than the same sound lacking an HFC. These results suggest the existence of a previously unrecognized response to complex sound containing particular types of high frequencies above the audible range. We term this phenomenon the “hypersonic effect.”

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Dunning, Dennis J., Quentin E. Ross, Paul Geoghegan, James J. Reichle, John K. Menezes, and John K. Watson. "Alewives Avoid High-Frequency Sound." North American Journal of Fisheries Management 12, no. 3 (August 1992): 407–16. http://dx.doi.org/10.1577/1548-8675(1992)012<0407:aahfs>2.3.co;2.

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Spangler, Hayward G. "High-Frequency Sound Production by Honeybees." Journal of Apicultural Research 25, no. 4 (January 1986): 213–19. http://dx.doi.org/10.1080/00218839.1986.11100720.

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Ridwan, Muhammad, and Ulfah Nurul Amanah. "Fundamental Frequency and Tone in Arabic Vowels and Consonants by Indonesian Speakers Aged 5 Years Old." Jurnal Humaniora 31, no. 3 (December 2, 2019): 274. http://dx.doi.org/10.22146/jh.32581.

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This study discusses the fundamental frequency and tone in Arabic vowels and consonants by Indonesian speakers aged 5 years old. The method of data collecting used an interview method by recording and writing techniques. It also employed one respondent who was 5 years old from the Javanese who resides in Surakarta city. The device used for recording was OPPO Joy 3 mobile phone, which is equipped with RecForge II program and microphone that can record sound clearly. An instrument that was used to know the fundamental frequency and tone was Praat 6.0.26 version. The method of data analysis employed comparing method using the basic technique of elemental sorter technique, connecting technique, and diﬀerential technique. The result of the analysis showed that the fundamental frequency is correlated with the tone. If the fundamental frequency was high and likewise the tone. A vowel sound with the high fundamental frequency is sound [u], followed by [i], then [a]. The high and low frequency of vowel sounds aﬀected the frequency of the consonant sound followed by the vowel. It was known that 52% of consonants with the high tone were accompanied by punctuation [d̪ˤammah], 40% were accompanied by punctuation [kasrah], and 8% were accompanied by punctuation [fatħah]. The highest frequency sounding group was the apico-palatal sound. It happened since the apico-palatal sound was produced by vocal cord in a high vibration inﬂuencing the fundamental frequency and tone. Whereas, the group of consonant sounds with the lowest frequency was a pharyngeal sound as it had a low vibration on the vocal cord; hence, it only produced the low frequency sound.

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ITO, Kae, Tatsuya ISHII, Shunji ENOMOTO, and Hitoshi ISHIKAWA. "High frequency sound reduction by air shield." Transactions of the JSME (in Japanese) 86, no. 884 (2020): 19–00374. http://dx.doi.org/10.1299/transjsme.19-00374.

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Davis, J. P., H. Choi, J. Pollanen, and W. P. Halperin. "High Frequency Sound in Superfluid 3He-B." Journal of Low Temperature Physics 153, no. 1-2 (August 19, 2008): 1–14. http://dx.doi.org/10.1007/s10909-008-9819-1.

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Dell'Anna, R., G. Ruocco, M. Sampoli, and G. Viliani. "High Frequency Sound Waves in Vitreous Silica." Physical Review Letters 80, no. 6 (February 9, 1998): 1236–39. http://dx.doi.org/10.1103/physrevlett.80.1236.

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Ma, Zha Gen, Xue Ying Xu, and Guo Hua Han. "The Study on Influence of High Frequency Noise on Sound Quality for Generator." Applied Mechanics and Materials 105-107 (September 2011): 74–79. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.74.

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As cars become quieter the sound quality of components becomes more critical in the customer perception of car quality. This requires a need of new evaluation method for the specification of component sounds. Considering that high frequency noise plays an important roll for internal noise, the noise signals in the range from 7000Hz to 8000Hz are specially emphasized. Then the acoustic evaluation parameters, such as Sound Pressure Level, Sharpness and Steadiness have been evaluated. Judged from experiences and measuring results, an abnormal noise comes from Generator, through the exchange of Generator, Sound Pressure Level and sharpness were greatly improved. At the same time, subjective evaluation also indicated that there was no complaint any more in passenger compartment. Low Sound Pressure Level, sharpness can lead to perceived high product quality.

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Vos, Joos, and Mark M. J. Houben. "Annoyance caused by the low-frequency sound produced by aircraft during takeoff." Journal of the Acoustical Society of America 152, no. 6 (December 2022): 3706–15. http://dx.doi.org/10.1121/10.0016596.

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In a laboratory study, the indoor annoyance caused by the sound produced by aircraft during the takeoff on the runway is investigated. This aircraft sound is dominated by relatively high sound levels in the 16 and 31.5 Hz octave bands. Road-traffic and passenger railway sounds, which lack high sound levels in these octave bands, are included as references. The sounds are presented at indoor A-weighted equivalent levels of 32 and 42 dB. The participants are males and females between 20 and 40, or between 40 and 60 years of age. The indoor annoyance increased with sound level, but it was not affected by source type. Moreover, it was not or hardly affected by gender or age. With the dose expressed as A-weighted outdoor levels, the penalty for the aircraft sound and the bonus for the passenger railway sound at least qualitatively correspond to those obtained in pertinent previous studies. In the present study, such adjustments can be avoided by including the difference between the outdoor C-weighted and A-weighted levels as a second predictor, yielding an explained variance in the mean indoor annoyance ratings as high as 98%.

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Jones, Heath G., Andrew D. Brown, Kanthaiah Koka, Jennifer L. Thornton, and Daniel J. Tollin. "Sound frequency-invariant neural coding of a frequency-dependent cue to sound source location." Journal of Neurophysiology 114, no. 1 (July 2015): 531–39. http://dx.doi.org/10.1152/jn.00062.2015.

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The century-old duplex theory of sound localization posits that low- and high-frequency sounds are localized with two different acoustical cues, interaural time and level differences (ITDs and ILDs), respectively. While behavioral studies in humans and behavioral and neurophysiological studies in a variety of animal models have largely supported the duplex theory, behavioral sensitivity to ILD is curiously invariant across the audible spectrum. Here we demonstrate that auditory midbrain neurons in the chinchilla ( Chinchilla lanigera) also encode ILDs in a frequency-invariant manner, efficiently representing the full range of acoustical ILDs experienced as a joint function of sound source frequency, azimuth, and distance. We further show, using Fisher information, that nominal “low-frequency” and “high-frequency” ILD-sensitive neural populations can discriminate ILD with similar acuity, yielding neural ILD discrimination thresholds for near-midline sources comparable to behavioral discrimination thresholds estimated for chinchillas. These findings thus suggest a revision to the duplex theory and reinforce ecological and efficiency principles that hold that neural systems have evolved to encode the spectrum of biologically relevant sensory signals to which they are naturally exposed.

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Donskoy, Dimitri M. "Broadband low‐frequency sound radiator with high‐frequency pump resonator." Journal of the Acoustical Society of America 91, no. 4 (April 1992): 2429. http://dx.doi.org/10.1121/1.403179.

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Gai, Yan, Vibhakar C. Kotak, Dan H. Sanes, and John Rinzel. "On the localization of complex sounds: temporal encoding based on input-slope coincidence detection of envelopes." Journal of Neurophysiology 112, no. 4 (August 15, 2014): 802–13. http://dx.doi.org/10.1152/jn.00044.2013.

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Behavioral and neural findings demonstrate that animals can locate low-frequency sounds along the azimuth by detecting microsecond interaural time differences (ITDs). Information about ITDs is also available in the amplitude modulations (i.e., envelope) of high-frequency sounds. Since medial superior olivary (MSO) neurons encode low-frequency ITDs, we asked whether they employ a similar mechanism to process envelope ITDs with high-frequency carriers, and the effectiveness of this mechanism compared with the process of low-frequency sound. We developed a novel hybrid in vitro dynamic-clamp approach, which enabled us to mimic synaptic input to brain-slice neurons in response to virtual sound and to create conditions that cannot be achieved naturally but are useful for testing our hypotheses. For each simulated ear, a virtual sound, computer generated, was used as input to a computational auditory-nerve model. Model spike times were converted into synaptic input for MSO neurons, and ITD tuning curves were derived for several virtual-sound conditions: low-frequency pure tones, high-frequency tones modulated with two types of envelope, and speech sequences. Computational models were used to verify the physiological findings and explain the biophysical mechanism underlying the observed ITD coding. Both recordings and simulations indicate that MSO neurons are sensitive to ITDs carried by spectrotemporally complex virtual sounds, including speech tokens. Our findings strongly suggest that MSO neurons can encode ITDs across a broad-frequency spectrum using an input-slope-based coincidence-detection mechanism. Our data also provide an explanation at the cellular level for human localization performance involving high-frequency sound described by previous investigators.

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Hsieh, Min-Chih, Hung-Jen Chen, Ming-Le Tong, and Cheng-Wu Yan. "Effect of Environmental Noise, Distance and Warning Sound on Pedestrians’ Auditory Detectability of Electric Vehicles." International Journal of Environmental Research and Public Health 18, no. 17 (September 2, 2021): 9290. http://dx.doi.org/10.3390/ijerph18179290.

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With developments in science and technology, the number of electric vehicles will increase, and they will even replace ICE vehicles. Thus, perceiving the presence of approaching electric vehicles on the road has become an important issue. In this study, the auditory detectability of the electric vehicle warning sound at different volumes, distances, and environmental noise levels was investigated. To this end, the detection rate was recorded in experiments with three environmental noise levels (50, 60, and 70 dBA), two sound pressure levels (SPLs) of the warning sound (46 and 51 dBA), three frequency combinations of the warning sound (5000, 2500, 1250, and 630 Hz for high frequencies; 2500, 1250, 630, and 315 Hz for medium frequencies; and 1250, 630, 315, and 160 Hz for low frequencies), and five distances (2, 4, 6, 8, and 10 m). The main results showed that the detection rate at 51 dBA was significantly higher than that at 46 dBA under a high-frequency warning sound; however, the detection rates were similar under medium- and low-frequency warning sounds. The participants’ rates of detection for warning sounds were less than 20% under all experimental conditions, and a high-frequency warning sound was not affected by environmental noise. With regard to distances, no significant effects were observed between the distances and the detection rate at any of the three frequencies. In addition, auditory thresholds based on high-, medium-, and low-frequency warning sounds were found through logistic regression analysis results. The results of this study can be used as a reference for the future design of warning sounds.

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Sales, G. D., S. R. Milligan, and K. Khirnykh. "Sources of Sound in the Laboratory Animal Environment: A Survey of the Sounds Produced by Procedures and Equipment." Animal Welfare 8, no. 2 (May 1999): 97–115. http://dx.doi.org/10.1017/s0962728600021448.

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AbstractSounds in the laboratory and animal house environment were monitored for sound pressure levels over both low frequency (10Hz-l2.5kHz) and high frequency (12.5—70 kHz) ranges and were recorded for frequency analysis over the range 10Hz-100kHz. Forty sources of sound were investigated at 10 different sites. Sources included environmental control systems, maintenance and husbandry procedures, cleaning equipment and other equipment used near animals. Many of the sounds covered a wide frequency band and extended into the ultrasonic (> 20kHz) range. Sound levels produced by environmental control systems were generally at a low level. High sound pressure levels (SPLs) up to and exceeding 85dB SPL were recorded during cleaning and particularly high levels were recorded from the transport systems studied. Equipment such as a tattoo gun, a condensation extractor system, a high-speed centrifuge, and an ultrasonic disintegrator produced high levels of sound over a broad spectrum.As many laboratory animals are much more sensitive to a wider range of sound frequency than humans, it seems likely that the levels of sound reported here could adversely affect animals through physiological or behavioural changes, or may even cause sensory damage in extreme cases. There appear to have been no studies on the minimal threshold levels for such adverse responses, or on the long-term effects of exposure to the types of sounds recorded here. It is not yet possible to set realistic exposure limits for laboratory animals.

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Gautama Simanjuntak, Juniarto, Mega Putri Amelya, Fitri Nuraeni, and Rika Raffiudin. "Keragaman Suara Tonggeret dan Jangkrik di Taman Nasional Gunung Gede Pangrango." Jurnal Sumberdaya Hayati 6, no. 1 (December 3, 2020): 20–25. http://dx.doi.org/10.29244/jsdh.6.1.20-25.

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Indonesia is a biodiversity country and has much of samples of bioacoustics but there are no bioacoustics data collected and saved to be referred. Bioacoustics is a study of frequency range, sound amplitudo intensity, sound fluctuation, and sound patterns. It is very useful to study more about population presumption and species determination. This insect bioacoustics research is done at Gunung Gede Pangrango National Park and aims to analyse variety of sound frequency of cicada and cricket. Methods which are used are recording the sounds, editing and analyzing the record result with Praat and Raven Lite 2.0 softwares, and analysing the environment. Analysing the sounds which is done is to find miximum frequency, minimum frequency, and average frequency. The result of the sounds analysis is compared to database in Singing Insect of North America (SINA). Environmental analysing includes temperature, air humidity, and light intensity. There are nine cicada sound recording files and twenty four cricket sound recording files. Cicada has high sound characteristic (9,168.2 Hz) and cricket has low sound characteristic (3,311.80 Hz). Comparation to Singing Insect of North America (SINA) database shows that the cicada’s sound is resemble to Tibicen marginalis and the cricket’s sound is resemble to Grylodes sigillatus.

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Zhao, Fengtong, Bo Cui, Haitao Liu, Fei Wu, and Yundong Sha. "The Characteristics and Mechanisms of High-Intensity Sound in a High-Speed Multistage Compressor." Applied Sciences 12, no. 14 (July 7, 2022): 6865. http://dx.doi.org/10.3390/app12146865.

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An experiment with a multistage high-speed compressor is conducted to investigate the high noise with abnormal blade vibration. Different points are selected to monitor the noise in the compressor and the amplitude of blade vibration. The evolution rhythm of sound frequency and sound pressure level against speed is captured. The relation between the vibration and the noise is obtained. A research method based on an acoustic analogy is developed to investigate the characteristics and mechanisms of high-intensity sound in a rectangular cavity pipeline. The calculated distribution of the first four-order acoustic mode inside the rectangular cavity pipe is consistent with the results in the literature, and the maximum calculation error of the acoustic mode frequency value is 2.7%, which certifies the effectiveness of the method. A simplified compressor model is established to study the vortex system and the sound field characteristics of this method when high-intensity sound occurs. The results present the motion law of shedding vortices with high-intensity sound, and the calculation error of the frequency corresponding to the high-intensity sound is 3.6%. The “frequency-locked phase-locked” characteristics (i.e., character frequency) keep constant at a range of velocities, showing similarity with the phenomenon obtained in experiment above, and beta mode forms of Parker are captured. The study in the present paper makes a contribution for the cognition of mechanisms with high-intensity sound in aeroengine compressors.

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Dariusz, Pleban, and Mikulski Witold. "Methods of Testing of Sound Insulation Properties of Barriers Intended for High Frequency Noise and Ultrasonic Noise Protection." Strojnícky casopis – Journal of Mechanical Engineering 68, no. 4 (December 1, 2018): 55–64. http://dx.doi.org/10.2478/scjme-2018-0047.

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AbstractTwo test stands for determining sound insulation in the frequency range above 5 kHz were made. One consisted of two horizontally adjacent reverberation rooms and a special source of high frequency sounds and ultrasounds. The other test stand consisted of a miniaturized test chamber and a special source of ultrasounds. The paper presents results of the preliminary measurements of sound insulation properties of different barriers in the frequency range above 5 kHz.

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Clark, Christopher James, and Teresa J. Feo. "The Anna's hummingbird chirps with its tail: a new mechanism of sonation in birds." Proceedings of the Royal Society B: Biological Sciences 275, no. 1637 (January 29, 2008): 955–62. http://dx.doi.org/10.1098/rspb.2007.1619.

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A diverse array of birds apparently make mechanical sounds (called sonations) with their feathers. Few studies have established that these sounds are non-vocal, and the mechanics of how these sounds are produced remains poorly studied. The loud, high-frequency chirp emitted by a male Anna's hummingbird ( Calypte anna ) during his display dive is a debated example. Production of the sound was originally attributed to the tail, but a more recent study argued that the sound is vocal. Here, we use high-speed video of diving birds, experimental manipulations on wild birds and laboratory experiments on individual feathers to show that the dive sound is made by tail feathers. High-speed video shows that fluttering of the trailing vane of the outermost tail feathers produces the sound. The mechanism is not a whistle, and we propose a flag model to explain the feather's fluttering and accompanying sound. The flag hypothesis predicts that subtle changes in feather shape will tune the frequency of sound produced by feathers. Many kinds of birds are reported to create aerodynamic sounds with their wings or tail, and this model may explain a wide diversity of non-vocal sounds produced by birds.

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Chen, Hui Yu, and Jing Gong. "Analysis about the Effect on the Design of the Diffusers." Applied Mechanics and Materials 174-177 (May 2012): 2016–19. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.2016.

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In order to study the effect of the diffusers,there has been designed a variety of diffusers.If groove depth is large , the diffuser will become a high absorption coefficient, low-frequency sounds will reduce significantly. So we have spread the body size nested within each other, a small has been nested in a large body .The smaller parts expand of high-frequency sound, the larger parts for low-frequency sound, so over a wide frequency band can been spreading.

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Mizukoshi, Fumiya, and Hidetoshi Takahashi. "Acoustic notch filtering earmuff utilizing Helmholtz resonator arrays." PLOS ONE 16, no. 10 (October 19, 2021): e0258842. http://dx.doi.org/10.1371/journal.pone.0258842.

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In recent years, noisy bustling environments have created situations in which earmuffs must soundproof only specific noise while transmitting significant sounds, such as voices, for work safety and efficiency. Two sound insulation technologies have been utilized: passive noise control (PNC) and active noise control (ANC). However, PNC is incapable of insulating selective frequencies of noise, and ANC is limited to low-frequency sounds. Thus, it has been difficult for traditional earmuffs to cancel out only high-frequency noise that people feel uncomfortable hearing. Here, we propose an acoustic notch filtering earmuff utilizing Helmholtz resonator (HR) arrays that provides a sound attenuation effect around the tuneable resonant frequency. A sheet-like sound insulating plate comprising HR arrays is realized in a honeycomb structure. Since the resonant frequency is determined by the geometry of the HR arrays, a highly audible sound region can be designed as the target frequency. In this research, the acoustic notch filtering performance of the proposed HR array plate is investigated in both simulations and experiments. Furthermore, the fabricated earmuffs using the novel HR array plates achieve a sound insulation performance exceeding 40 dB at the target frequency, which is sufficiently high compared to that of conventional earmuffs. The experimental results confirm that the proposed device is a useful approach for insulating frequency-selective sound.

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Kellam, Barbara, and Jatinder Bhatia. "Sound Spectral Analysis in the Intensive Care Nursery: Measuring High-Frequency Sound." Journal of Pediatric Nursing 23, no. 4 (August 2008): 317–23. http://dx.doi.org/10.1016/j.pedn.2007.09.009.

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Luecke, Vivien Nancy, Laura Buchwieser, Peter zu Eulenburg, Torsten Marquardt, and Markus Drexl. "Ocular and cervical vestibular evoked myogenic potentials elicited by air-conducted, low-frequency sound." Journal of Vestibular Research 30, no. 4 (October 17, 2020): 235–47. http://dx.doi.org/10.3233/ves-200712.

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BACKGROUND: Sound is not only detected by the cochlea, but also, at high intensities, by the vestibular system. Acoustic activation of the vestibular system can manifest itself in vestibular evoked myogenic potentials (VEMPs). In a clinical setting, VEMPs are usually evoked with rather high-frequency sound (500 Hz and higher), despite the fact that only a fraction of saccular and utricular hair cells in the striolar region is available for high-frequency stimulation. OBJECTIVE: As a growing proportion of the population complains about low-frequency environmental noise, including reports on vestibular symptoms, the activation of the vestibular system by low-frequency sound deserves better understanding. METHODS: We recorded growth functions of oVEMPs and cVEMPs evoked with air-conducted sound at 120 Hz and below. We estimated VEMP thresholds and tested whether phase changes of the stimulus carrier result in changes of VEMP amplitude and latency. RESULTS: The VEMP response of the otholith organs to low-frequency sound is uniform and not tuned when corrected for middle ear attenuation by A-weighting the stimulus level. Different stimulus carrier phases result in phase-correlated changes of cVEMP latencies and amplitudes. CONCLUSIONS: VEMPs can be evoked with rather low-frequency sound, but high thresholds suggest that they are unlikely to be triggered by environmental sounds.

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Greene, Charles H., Peter H. Wiebe, and Janusz Burczynski. "Analyzing zooplankton size distributions using high-frequency sound." Limnology and Oceanography 34, no. 1 (January 1989): 129–39. http://dx.doi.org/10.4319/lo.1989.34.1.0129.

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UDA, Toki, Yoichi SAWAMURA, Toshiki KITAGAWA, Sanetoshi SAITOH, and Yusuke WAKABAYASHI. "Low-frequency aerodynamic sound from high-speed trains." Proceedings of the Symposium on Environmental Engineering 2017.27 (2017): 123. http://dx.doi.org/10.1299/jsmeenv.2017.27.123.

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Jaffe, Jules S. "High‐frequency sound variation in a coastal environment." Journal of the Acoustical Society of America 96, no. 5 (November 1994): 3287. http://dx.doi.org/10.1121/1.410891.

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Foote, Kenneth G. "Rather‐high‐frequency sound scattering by swimbladdered fish." Journal of the Acoustical Society of America 78, no. 2 (August 1985): 688–700. http://dx.doi.org/10.1121/1.392438.

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Han-Moi, Shim, Cho Ok-Hue, Jang Seok-Woo, Choi Ji-Hyang, Choi Hyun, and Lee Won-Hyung. "Inaudible high-frequency sound affects frontlobe brain activity." Contemporary Engineering Sciences 7 (2014): 1189–96. http://dx.doi.org/10.12988/ces.2014.49148.

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Sun, Zhongbo, Jiajia Jiang, Yao Li, Chunyue Li, Zhuochen Li, Xiao Fu, and Fajie Duan. "An automated piecewise synthesis method for cetacean tonal sounds based on time-frequency spectrogram." Journal of the Acoustical Society of America 151, no. 6 (June 2022): 3758–69. http://dx.doi.org/10.1121/10.0011551.

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Bionic signal waveform design plays an important role in biological research, as well as bionic underwater acoustic detection and communication. Most conventional methods cannot construct high-similarity bionic waveforms to match complex cetacean sounds or easily modify the time-frequency structure of the synthesized bionic signals. In our previous work, we proposed a synthesis and modification method for cetacean tonal sounds, but it requires a lot of manpower to construct each bionic signal segment to match the tonal sound contour. To solve these problems, an automated piecewise synthesis method is proposed. First, based on the time-frequency spectrogram of each tonal sound, the fundamental contour and each harmonic contour of the tonal sound is automatically recognized and extracted. Then, based on the extracted contours, four sub power frequency modulation bionic signal models are combined to match cetacean sound contours. Finally, combining the envelopes of the fundamental frequency and each harmonic, the synthesized bionic signal is obtained. Experimental results show that the Pearson correlation coefficient (PCC) between all true cetacean sounds and their corresponding bionic signals are higher than 0.95, demonstrating that the proposed method can automatically imitate all kinds of simple and complex cetacean tonal sounds with high similarity.

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Sharma, Snandan, Lucas H.M. Mens, Ad F.M. Snik, A. John van Opstal, and Marc M. van Wanrooij. "Hearing Asymmetry Biases Spatial Hearing in Bimodal Cochlear-Implant Users Despite Bilateral Low-Frequency Hearing Preservation." Trends in Hearing 27 (January 2023): 233121652211439. http://dx.doi.org/10.1177/23312165221143907.

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Many cochlear implant users with binaural residual (acoustic) hearing benefit from combining electric and acoustic stimulation (EAS) in the implanted ear with acoustic amplification in the other. These bimodal EAS listeners can potentially use low-frequency binaural cues to localize sounds. However, their hearing is generally asymmetric for mid- and high-frequency sounds, perturbing or even abolishing binaural cues. Here, we investigated the effect of a frequency-dependent binaural asymmetry in hearing thresholds on sound localization by seven bimodal EAS listeners. Frequency dependence was probed by presenting sounds with power in low-, mid-, high-, or mid-to-high-frequency bands. Frequency-dependent hearing asymmetry was present in the bimodal EAS listening condition (when using both devices) but was also induced by independently switching devices on or off. Using both devices, hearing was near symmetric for low frequencies, asymmetric for mid frequencies with better hearing thresholds in the implanted ear, and monaural for high frequencies with no hearing in the non-implanted ear. Results show that sound-localization performance was poor in general. Typically, localization was strongly biased toward the better hearing ear. We observed that hearing asymmetry was a good predictor for these biases. Notably, even when hearing was symmetric a preferential bias toward the ear using the hearing aid was revealed. We discuss how frequency dependence of any hearing asymmetry may lead to binaural cues that are spatially inconsistent as the spectrum of a sound changes. We speculate that this inconsistency may prevent accurate sound-localization even after long-term exposure to the hearing asymmetry.

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Schmidt, Felix N., Maximilian M. Delsmann, Kathrin Mletzko, Timur A. Yorgan, Michael Hahn, Ursula Siebert, Björn Busse, Ralf Oheim, Michael Amling, and Tim Rolvien. "Ultra-high matrix mineralization of sperm whale auditory ossicles facilitates high sound pressure and high-frequency underwater hearing." Proceedings of the Royal Society B: Biological Sciences 285, no. 1893 (December 12, 2018): 20181820. http://dx.doi.org/10.1098/rspb.2018.1820.

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The auditory ossicles—malleus, incus and stapes—are the smallest bones in mammalian bodies and enable stable sound transmission to the inner ear. Sperm whales are one of the deepest diving aquatic mammals that produce and perceive sounds with extreme loudness greater than 180 dB and frequencies higher than 30 kHz. Therefore, it is of major interest to decipher the microstructural basis for these unparalleled hearing abilities. Using a suite of high-resolution imaging techniques, we reveal that auditory ossicles of sperm whales are highly functional, featuring an ultra-high matrix mineralization that is higher than their teeth. On a micro-morphological and cellular level, this was associated with osteonal structures and osteocyte lacunar occlusions through calcified nanospherites (i.e. micropetrosis), while the bones were characterized by a higher hardness compared to a vertebral bone of the same animals as well as to human auditory ossicles. We propose that the ultra-high mineralization facilitates the unique hearing ability of sperm whales. High matrix mineralization represents an evolutionary conserved or convergent adaptation to middle ear sound transmission.

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Browning, David G., and Robert H. Mellen. "A comparison between low‐frequency sound absorption in seawater and high‐frequency sound absorption in serum albumen." Journal of the Acoustical Society of America 85, S1 (May 1989): S88. http://dx.doi.org/10.1121/1.2027192.

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Hung, Yu-Chen, Ya-Jung Lee, and Li-Chiun Tsai. "Validation of the Chinese Sound Test: Auditory Performance of Hearing Aid Users." American Journal of Audiology 27, no. 1 (March 8, 2018): 37–44. http://dx.doi.org/10.1044/2017_aja-17-0057.

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Purpose The Chinese Sound Test (Hung, Lin, Tsai, & Lee, 2016) has been recently developed as a modified version of the Ling Six-Sound Test (Ling, 2012). By incorporating Chinese speech sounds, this test should be able to estimate whether the listener can hear across the Chinese speech spectrum. To establish the clinical validity of the test, this study examined the relationship between the aided audiometric thresholds and the distance thresholds. Method Sixty children with bilateral hearing aids were recruited. The aided sound-field thresholds at 250, 500, 1000, 2000, 4000, and 6000 Hz were compared with the distance thresholds of six sounds, /u, ə, a, i, tɕʰ, and s/, which encompass the entire Chinese speech frequency range from low to high. Results Partial correlation and stepwise regression analyses revealed that the Chinese testing sounds are frequency specific and that the audibility of each sound could be predicted by a specific frequency threshold. Conclusions The results confirm the validity of the Chinese Sound Test, indicating that the testing sounds can be reliably used to assess the perception of frequency-specific information. Crucially, these data also demonstrate that the Chinese Sound Test is a useful tool to identify red flags of poor auditory access in daily environment to monitor device malfunctions and possible hearing fluctuations.

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Jo, Song, Ikei, Enomoto, Kobayashi, and Miyazaki. "Physiological and Psychological Effects of Forest and Urban Sounds Using High-Resolution Sound Sources." International Journal of Environmental Research and Public Health 16, no. 15 (July 24, 2019): 2649. http://dx.doi.org/10.3390/ijerph16152649.

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Exposure to natural sounds is known to induce feelings of relaxation; however, only few studies have provided scientific evidence on its physiological effects. This study examined prefrontal cortex and autonomic nervous activities in response to forest sound. A total of 29 female university students (mean age 22.3 ± 2.1 years) were exposed to high-resolution sounds of a forest or city for 60 s, using headphones. Oxyhemoglobin (oxy-Hb) concentrations in the prefrontal cortex were determined by near-infrared spectroscopy. Heart rate, the high-frequency component of heart rate variability (which reflects parasympathetic nervous activity), and the ratio of low-frequency to high-frequency (LF/HF) components (which reflects sympathetic nervous activity) were measured. Subjective evaluation was performed using the modified semantic differential method and profiles of mood states. Exposure to the forest sound resulted in the following significant differences compared with exposure to city sound: decreased oxy-Hb concentrations in the right prefrontal cortex; decreased ln(LF/HF); decreased heart rate; improved feelings described as “comfortable,’’ “relaxed,” and “natural”; and improved mood states. The findings of this study demonstrated that forest-derived auditory stimulation induced physiological and psychological relaxation effects.

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Dorkoski, Ryan, Kenneth E. Hancock, Gareth A. Whaley, Timothy R. Wohl, Noelle C. Stroud, and Mitchell L. Day. "Stimulus-frequency-dependent dominance of sound localization cues across the cochleotopic map of the inferior colliculus." Journal of Neurophysiology 123, no. 5 (May 1, 2020): 1791–807. http://dx.doi.org/10.1152/jn.00713.2019.

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A “division of labor” has previously been assumed in which the directions of low- and high-frequency sound sources are thought to be encoded by neurons preferentially sensitive to low and high frequencies, respectively. Contrary to this, we found that auditory midbrain neurons encode the directions of both low- and high-frequency sounds regardless of their preferred frequencies. Neural responses were shaped by different sound localization cues depending on the stimulus spectrum—even within the same neuron.

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Azalia, Aisha, Desi Ramadhanti, Hestiana Hestiana, and Heru Kuswanto. "Audacity Software Analysis In Analyzing The Frequency And Character Of The Sound Spectrum." Jurnal Penelitian Pendidikan IPA 8, no. 1 (January 11, 2022): 177–82. http://dx.doi.org/10.29303/jppipa.v8i1.913.

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In the process of learning physics, experiments are needed that can help someone in gaining a deeper understanding of learning physics concepts and using technology in the learning process, especially learning sound waves. In this study, the aim is to be able to analyze the sound frequency with the help of Audacity software. Subjects used are 5 different cat sounds. The implementation of this research uses several tools such as a microphone, Audacity software on a laptop, and 5 cat sounds. This experiment was carried out by bringing the micro hope closer to the cat with 5 cm so that the sound was captured by the microphone which would later be transferred to the laptop and read by the audacity software. Furthermore, the data recorded in audacity were analyzed. From the results of the study, it can be said that a tool that can be used in practicum and can read and capture sound waves is effectively used in analyzing sound frequency, spectrum in the application of sound learning so that it can be used as one of the learning media in practicum on sound wave material at Junior high school.

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Zhang, Rui, Desen Yang, Shengguo Shi, and Boquan Yang. "Model approximation for sound transmission from underwater structures in high-frequency range." MATEC Web of Conferences 283 (2019): 09007. http://dx.doi.org/10.1051/matecconf/201928309007.

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Sound-insulation model provides a straightforward way to describe sound transmission behaviours of the thin-walled structures in engineering applications. The sound transmission characteristics depend on the parameters of incident wave, such as incident wave amplitude and incident angles. However, this model is limited when the sound source is located in an enclosed space (e.g., noise source in underwater cabins), because it is difficult to obtain incident angles especially in the high-frequency range. In this paper, we develop a simply analytical model that can effectively study the sound transmission from an enclosed shell with internal acoustic excitation. In order to extend the application of the sound-insulation model to a submerged shell, the structural vibration equation is firstly simplified to the plate vibration equation. Then, the sound pressure near the inner surface of the shell is decomposed into an expansion of orthogonal cavity eigenmodes, and each cavity mode is replaced by two pairs of incident plane waves. Finally, the acoustic transmission loss can be obtained by substituting the parameters of incident waves into the sound-insulation model. Numerical results show that the sound transmission for the fundamental cavity mode (0, 0, 0) can be explained by the normal incidence in the sound-insulation model, while every other modes corresponds to a group of oblique incident plane waves whose incident angles decrease monotonically with the increase of frequency. In addition, it can be observed that the total reflection phenomenon in the sound-insulation model is consistent with the low radiation efficiency of the high order modes in the shell model.

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Ding, Xiaoxia, Zhipeng Wu, Mingze Gao, Minkan Chen, Jiawei Li, Tao Wu, and Liang Lou. "A High-Sensitivity Bowel Sound Electronic Monitor Based on Piezoelectric Micromachined Ultrasonic Transducers." Micromachines 13, no. 12 (December 14, 2022): 2221. http://dx.doi.org/10.3390/mi13122221.

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Bowel sounds contain some important human physiological parameters which can reflect information about intestinal function. In this work, in order to realize real-time monitoring of bowel sounds, a portable and wearable bowel sound electronic monitor based on piezoelectric micromachined ultrasonic transducers (PMUTs) is proposed. This prototype consists of a sensing module to collect bowel sounds and a GUI (graphical user interface) based on LabVIEW to display real-time bowel sound signals. The sensing module is composed of four PMUTs connected in parallel and a signal conditioning circuit. The sensitivity, noise resolution, and non-linearity of the bowel sound monitor are measured in this work. The result indicates that the designed prototype has high sensitivity (−142.69 dB), high noise resolution (50 dB at 100 Hz), and small non-linearity. To demonstrate the characteristic of the designed electronic monitor, continuous bowel sound monitoring is performed using the electronic monitor and a stethoscope on a healthy human before and after a meal. Through comparing the experimental results and analyzing the signals in the time domain and frequency domain, this bowel sound monitor is demonstrated to record bowel sounds from the human intestine. This work displays the potential of the sensor for the daily monitoring of bowel sounds.

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Imamori, Kanta, Atsuya Yoshiga, and Junji Yoshida. "Sound quality evaluation for luxury refrigerator door closing sound." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 5 (August 1, 2021): 1845–54. http://dx.doi.org/10.3397/in-2021-1968.

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In this study, we carried out subjective evaluation tests employing 19 refrigerator door closing sounds to quantify the luxury feeling. By applying factor analysis to the subjective evaluation results, the sound quality of the refrigerator door closing sound was found to be expressed by the following two factors: overall loudness and the pitch of the sound. Subsequently, luxury feeling evaluation model was obtained through multiple regression analysis. As the result, the luxury feeling of the door closing sound was evaluated to be high when the sound was softer and had lower pitch. Then, we prepared several luxury door closing sounds according to the obtained evaluation model through a filter processing and conducted subjective evaluation tests again to verify the evaluation model. The result shows that the amplitude increased sound at low frequency band under 100 Hz, which was calculated to be high luxury by the evaluation model, was actually evaluated as the best among the presented sounds through the subjective test. And the luxury sound quality evaluation method was confirmed to be useful to quantify and estimate the sound quality of the refrigerator door closing sound.

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Lee, Yun-Ju, Chang-Hsu Chen, Chao-Che Wu, Yu-Jung Chen, and Jing Nong Liang. "Sound Effects on Standing Postural Strategies in the Elderly via Frequency Analysis Approach." Applied Sciences 10, no. 16 (August 11, 2020): 5539. http://dx.doi.org/10.3390/app10165539.

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Sound and sound frequency could improve postural sway in the elderly. The power spectrum intervals of the center of pressure (COP) displacement are associated with different postural regulations, which could be revealed by frequency analysis. The aim of the study was to investigate the effects of sound on dual-tasking postural control and conduct frequency analysis to distinguish postural regulations in the elderly. Fifteen young and 15 older healthy participants were instructed to stand on a force platform and performed the Purdue Pegboard test while hearing 50 dB sounds with sound frequencies of 250 Hz, 1000 Hz, 4000 Hz, or no sound. The total excursion, velocity, sway area, and power spectrum of low-, medium-, and high-frequency bands of the COP displacement were calculated in the anterior–posterior and medial–lateral directions. The percentages of low-frequency and medium-frequency bands in both directions were significantly different between with and without sound conditions, but not affected by sound frequency. Older adults showed a smaller percentage of low-frequency, larger percentage of medium-frequency, larger total COP excursion, and faster velocity in the medial–lateral direction. The outcome of the study supports the frequency analysis approach in evaluating sound effects on postural strategies in dual-tasking and reveals older adults utilize vestibular regulation as the primary postural strategy when the dual-task required visual attention.

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Ayton, Lorna J., and N. Peake. "On high-frequency noise scattering by aerofoils in flow." Journal of Fluid Mechanics 734 (October 8, 2013): 144–82. http://dx.doi.org/10.1017/jfm.2013.477.

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AbstractA theoretical model is developed for the sound scattered when a sound wave is incident on a cambered aerofoil at non-zero angle of attack. The model is based on the linearization of the Euler equations about a steady subsonic flow, and is an adaptation of previous work which considered incident vortical disturbances. Only high-frequency sound waves are considered. The aerofoil thickness, camber and angle of attack are restricted such that the steady flow past the aerofoil is a small perturbation to a uniform flow. The singular perturbation analysis identifies asymptotic regions around the aerofoil; local ‘inner’ regions, which scale on the incident wavelength, at the leading and trailing edges of the aerofoil; Fresnel regions emanating from the leading and trailing edges of the aerofoil due to the coalescence of singularities and points of stationary phase; a wake transition region downstream of the aerofoil leading and trailing edge; and an outer region far from the aerofoil and wake. An acoustic boundary layer on the aerofoil surface and within the transition region accounts for the effects of curvature. The final result is a uniformly-valid solution for the far-field sound; the effects of angle of attack, camber and thickness are investigated.

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Landström, Ulf, Kjell Englund, Bertil Nordström, and Anita Åström. "Laboratory Studies of a Sound System that Maintains Wakefulness." Perceptual and Motor Skills 86, no. 1 (February 1998): 147–61. http://dx.doi.org/10.2466/pms.1998.86.1.147.

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Two studies investigated the effects of a waking sound that enhances wakefulness. Study I investigated the effect of the sound level and Study 2 the effect of time and frequency variability of the sound. The recordings of EEG and subjective ratings were analysed to study the effect upon wakefulness. The waking effect increased when sound varied in duration and frequency. A number of specific conditions necessary for the waking effect are described. The exposure should be based on high frequency sounds and several tones chosen to produce disharmony. The exposure should be loud enough to be heard over the masking background noise. The duration and tonal quality should be variable from one presentation to another.

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BODONY, DANIEL J., and SANJIVA K. LELE. "Low-frequency sound sources in high-speed turbulent jets." Journal of Fluid Mechanics 617 (December 25, 2008): 231–53. http://dx.doi.org/10.1017/s0022112008004096.

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An analysis of the sound radiated by three turbulent, high-speed jets is conducted using Lighthill's acoustic analogy (Proc. R. Soc. Lond. A, vol. 211, 1952, p. 564). Computed by large eddy simulation the three jets operate at different conditions: a Mach 0.9 cold jet, a Mach 2.0 cold jet and a Mach 1.0 heated jet. The last two jets have the same jet velocity and differ only by temperature. None of the jets exhibit Mach wave characteristics. For these jets the comparison between the Lighthill-predicted sound and the directly computed sound is favourable for all jets and for the two angles (30° and 90°, measured from the downstream jet axis) considered. The momentum (ρuiuj) and the so-called entropy [p − p∞ − a∞2(ρ − ρ∞)] contributions are examined in the acoustic far field. It is found that significant phase cancellation exists between the momentum and entropy components. It is observed that for high-speed jets one cannot consider ρuiuj and (p′ − a∞2ρ′)δij as independent sources. In particular the ρ′ūxūx component of ρuiuj is strongly coupled with the entropy term as a consequence of compressibility and the high jet velocity and not because of a linear sound-generation mechanism. Further, in more usefully decoupling the momentum and entropic contributions, the decomposition of Tij due to Lilley (Tech. Rep. AGARD CP-131 1974) is preferred. Connections are made between the present results and the quieting of high-speed jets with heating.

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Sessarego, Jean-Pierre, RÉgine Guillermin, and Anatoly N. Ivakin. "High-Frequency Sound Reflection by Water-Saturated Sediment Interfaces." IEEE Journal of Oceanic Engineering 33, no. 4 (October 2008): 375–85. http://dx.doi.org/10.1109/joe.2008.2002457.

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Saussus, Patrick, and Kenneth A. Cunefare. "High‐frequency monopole sound source for anechoic chamber qualification." Journal of the Acoustical Society of America 113, no. 4 (April 2003): 2219. http://dx.doi.org/10.1121/1.4780274.

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Thivant, Michael, Patrik B. U. Andersson, and Jean-Louis Guyader. "Intensity Potential Approach for Modeling High-Frequency Sound Fields." Acta Acustica united with Acustica 97, no. 1 (January 1, 2011): 103–14. http://dx.doi.org/10.3813/aaa.918391.

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Shen, Jun-Xian. "High-frequency sound communication in the concave-eared frog." Journal of the Acoustical Society of America 131, no. 4 (April 2012): 3455. http://dx.doi.org/10.1121/1.4709020.

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Sandström, Roland, and Mats Olsson. "High Intensity Low Frequency Sound Used for Cleaning Purposes." Journal of Low Frequency Noise, Vibration and Active Control 5, no. 1 (March 1986): 9–13. http://dx.doi.org/10.1177/026309238600500102.

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Makler, S. S., D. E. Tuyarot, E. V. Anda, and M. I. Vasilevskiy. "Ultra-high-frequency coherent sound generation in resonant tunneling." Surface Science 361-362 (July 1996): 239–42. http://dx.doi.org/10.1016/0039-6028(96)00393-7.

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Xie, Liping, Chihua Lu, Zhien Liu, Yawei Zhu, and Weizhi Song. "A method of generating car sounds based on granular synthesis algorithm." Noise Control Engineering Journal 70, no. 4 (July 1, 2022): 384–93. http://dx.doi.org/10.3397/1/377031.

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The active sound generation technique for automobiles, where car sounds can be synthesized by means of electronic sound production, is one of the effective methods to achieve the target sound. A method for active sound generation of automobile based on the granular synthesis algorithm is put forward here to avoid the broadband beating phenomena that occur due to the mismatch of parameters of sound granular signals. The comparison of the function expression of sound signal and Hilbert transformation is performed based on the principle of overlap and add; moreover, those parameters (phase, frequency and amplitude) of sound signals are interpolated by means of the Hermite interpolation algorithm which can ensure the continuity of the phase, frequency and amplitude curves. Thus, the transition audio is constructed by means of the sound signal function here to splice the adjacent sound granules. Our simulations show that our method can be applied to solve the current broadband beating issue for splicing sound granules and achieve natural continuity of synthesized car sounds. The subjective test results also indicate that our transition audio can produce high quality audio restitution.

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Journal articles on the topic 'High frequency sound'

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