Relevant bibliographies by topics / Pitch variance

Academic literature on the topic 'Pitch variance'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Pitch variance"

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Bottalico, Pasquale, Natalia Łastowiecka, Joshua D. Glasner, and Yvonne Gonzales Redman. "Singing in different performance spaces: The effect of room acoustics on vibrato and pitch inaccuracy." Journal of the Acoustical Society of America 151, no. 6 (June 2022): 4131–39. http://dx.doi.org/10.1121/10.0011675.

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Previous literature suggests that musical performers may be influenced to some extent by the acoustic environment in which they sing or play. This study investigates the influence of room acoustics on singers' voice production, by analyzing consecutive sung performances of classically trained students in five different performance spaces. The analyzed voice parameters were vibrato rate, extent, and pitch inaccuracy. Nine classically trained student-singers performed the same aria unaccompanied on a variable starting pitch that was consistent between spaces. Variance in vibrato rate and pitch inaccuracy was primarily explained by individual differences between singers. Conversely, the variance attributable to the rooms for the parameter of vibrato extent was larger compared to the variance attributable to the performers. Vibrato extent tended to increase with room clarity (C80) and was inversely associated with early decay time (EDT). Additionally, pitch inaccuracy showed a significant negative association with room support (STv). Singers seem to adjust their vocal production when performing in different acoustic environments. Likewise, the degree to which a singer can hear themself on stage may influence pitch accuracy.
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Ueda, Sachiyo, Ayane Mizuguchi, Reiko Yakushijin, and Akira Ishiguchi. "Effects of the Simultaneous Presentation of Corresponding Auditory and Visual Stimuli on Size Variance Perception." i-Perception 9, no. 6 (November 2018): 204166951881570. http://dx.doi.org/10.1177/2041669518815709.

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To overcome limitations in perceptual bandwidth, humans condense various features of the environment into summary statistics. Variance constitutes indices that represent diversity within categories and also the reliability of the information regarding that diversity. Studies have shown that humans can efficiently perceive variance for visual stimuli; however, to enhance perception of environments, information about the external world can be obtained from multisensory modalities and integrated. Consequently, this study investigates, through two experiments, whether the precision of variance perception improves when visual information (size) and corresponding auditory information (pitch) are integrated. In Experiment 1, we measured the correspondence between visual size and auditory pitch for each participant by using adjustment measurements. The results showed a linear relationship between size and pitch—that is, the higher the pitch, the smaller the corresponding circle. In Experiment 2, sequences of visual stimuli were presented both with and without linked auditory tones, and the precision of perceived variance in size was measured. We consequently found that synchronized presentation of audio and visual stimuli that have the same variance improves the precision of perceived variance in size when compared with visual-only presentation. This suggests that audiovisual information may be automatically integrated in variance perception.
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Li, Aini, Ruaridh Purse, and Nicole Holliday. "Variation in global and intonational pitch settings among black and white speakers of Southern American English." Journal of the Acoustical Society of America 152, no. 5 (November 2022): 2617–28. http://dx.doi.org/10.1121/10.0014906.

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This article revisits classic questions about how pitch varies between groups by examining global and intonational pitch differences between black and white speakers from Memphis, Tennessee, using data from read speech to control for stylistic and segmental variables. Results from both mixed-effects regression modeling and smoothing spline analysis of variance find no difference between black and white men in mean F0 and pitch range measures. However, black women produced consistently lower mean F0 than white women. These findings suggest that while pitch patterns in black women's speech remain underexplored in the literature, they may play an important role in shaping attitudes and ideological associations concerning black American speakers in general. Moreover, vocal pitch may be a linguistic variable subject to variation, especially in a context of racialized and gendered linguistic standards.
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Wei, Xiaopeng, Lasheng Zhao, Qiang Zhang, and Jing Dong. "Robust pitch estimation using a wavelet variance analysis model." Signal Processing 89, no. 6 (June 2009): 1216–23. http://dx.doi.org/10.1016/j.sigpro.2009.01.005.

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Duling, Ed. "Predictors of Form Perception in Preservice Music Education Majors." Bulletin of the Council for Research in Music Education, no. 185 (July 1, 2010): 77–85. http://dx.doi.org/10.2307/41110367.

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Abstract Thirty-four undergraduate music education majors in a general music methods class created and present kinesthetic analogues (bodily movements) of recorded music (Cohen, 1997), which were then scored for quality of representation of pitch, rhythm, and form. Students’ACT scores and composite GPAs in music history, theory, and aural skills were used in the data analysis. Significant correlations were between form and pitch, form and rhythm, form and ACT, and form and GPA. A regression analysis for ACT with form perception as the dependent variable showed that ACT scores explained 16% of the variance [F(1, 33) = 6.445, p < .02]; analysis for GPA with form as the dependent variable showed the GPA explained 13% of the variance [F(1, 33) = 5.066, p < .03].The implications of the results for music education and directions for further research are discussed.
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Bidelman, Gavin M. "Sensitivity of the cortical pitch onset response to height, time-variance, and directionality of dynamic pitch." Neuroscience Letters 603 (August 2015): 89–93. http://dx.doi.org/10.1016/j.neulet.2015.07.018.

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Hutter, Elisabeth, Miriam Grapp, Heike Argstatter, and Hans Volker Bolay. "Music Therapy for Chronic Tinnitus: Variability of Tinnitus Pitch in the Course of Therapy." Journal of the American Academy of Audiology 25, no. 04 (April 2014): 335–42. http://dx.doi.org/10.3766/jaaa.25.4.5.

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Background: In general, tinnitus pitch has been observed to be variable across time for most patients experiencing tinnitus. Some tinnitus therapies relate to the dominant tinnitus pitch in order to adjust therapeutic interventions. As studies focusing on tinnitus pitch rarely conduct consecutive pitch matching in therapeutic settings, little is known about the course and variability of tinnitus pitch during therapeutic interventions. Purpose: The purpose of this study was to investigate the variability and development of tinnitus pitch in the course of therapeutic interventions. Tinnitus pitch was suspected to be highly variable. Research design: The researchers conducted a descriptive, retrospective analysis of data. Study Sample: A total of 175 adult patients experiencing chronic tinnitus served as participants. All patients had received a neuro-music therapy according to the “Heidelberg Model of Music Therapy for Chronic Tinnitus.” Data Collection and Analysis: During therapeutic interventions lasting for 5 consecutive days, the individual tinnitus frequency was assessed daily by means of a tinnitus pitch–matching procedure. The extent of variability in tinnitus pitch was calculated by mean ratios of frequencies between subsequent tinnitus measurements. Analysis of variance of repeated measures and post hoc paired samples t-tests were used for comparison of means in tinnitus frequencies, and the test-retest reliability of measurements was obtained by the Pearson product-moment correlation coefficient. Results: Tinnitus pitch displayed a variability of approximately 3/5 to 4/5 octaves per day. Overall, the mean frequency declined in the course of the therapy. Detailed analysis revealed three groups of patients with diverging tinnitus progression. The test-retest reliability between assessments turned out to be robust (r = 0.74 or higher). Conclusions: Considerable variation in tinnitus pitch was found. Consequently, a frequent rechecking of tinnitus frequency is suggested during frequency-specific acoustic stimulation in order to train appropriate frequency bands.
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Schueller, Marianne, Donald Fucci, and Z. S. Bond. "Perceptual Judgment of Voice Pitch during Pitch-Matching Tasks." Perceptual and Motor Skills 94, no. 3 (June 2002): 967–74. http://dx.doi.org/10.2466/pms.2002.94.3.967.

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This study investigated the perceptual judgment of voice pitch. 24 individuals were assigned to two groups to assess whether there is a difference in perceptual judgment of voice during pitch-matching tasks. Group I, Naïve listeners, had no previous experience in anatomy, physiology, or voice pitch-evaluation methods. Group II, Experienced listeners, were master's level speech-language pathologists having completed academic training in evaluation of voice. Both groups listened to identical stimuli, which required matching audiotaped voice-pitch samples of a male and female voice to a note on an electronic keyboard. The experiment included two tasks. The first task assessed pitch range, which required marching of the lowest and highest voice pitch of both a male and female speaker singing /a/ to a note on a keyboard. The second task assessed habitual pitch, which required matching of the voice pitch of a word spoken by a male and female speaker to a note on a keyboard. A one-way analysis of variance indicated a significant difference between groups occurred for only one of four conditions measured, perceptual judgment of the female pitch range. No differences between groups were found in the perceptual judgments of the male pitch range or during perceptual judgment of the female or male habitual pitch, suggesting that the skill possessed by speech-language pathology students is no different from that of inexperienced listeners.
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Siedenburg, Kai, and Stephen McAdams. "Short-term Recognition of Timbre Sequences." Music Perception 36, no. 1 (September 1, 2018): 24–39. http://dx.doi.org/10.1525/mp.2018.36.1.24.

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The goal of the current study was to explore outstanding questions in the field of timbre perception and cognition—specifically, whether memory for timbre is better in trained musicians or in nonmusicians, whether short-term timbre recognition is invariant to pitch differences, and whether timbre dissimilarity influences timbre recognition performance. Four experiments examined short-term recognition of musical timbre using a serial recognition task in which listeners indicated whether the orders of the timbres of two subsequently presented sound sequences were identical or not. Experiment 1 revealed significant effects of sequence length on recognition accuracy and an interaction of music training and pitch variability: musicians performed better for variable-pitch sequences, but did not differ from nonmusicians with constant-pitch sequences. Experiment 2 yielded a significant effect of pitch variability for musicians when pitch patterns varied between standard and comparison sequences. Experiment 3 high-lighted the impact of the timbral dissimilarity of swapped sounds and indicated a recency effect in timbre recognition. Experiment 4 confirmed the importance of the dissimilarity of the swap, but did not yield any pertinent role of timbral heterogeneity of the sequence. Further analyses confirmed the strong correlation of the timbral dissimilarity of swapped sounds with response behavior, accounting for around 90% of the variance in response choices across all four experiments. These results extend findings regarding the impact of music training and pitch variability from the literature on timbre perception to the domain of short-term memory and demonstrate the mnemonic importance of timbre similarity relations among sounds in sequences. The role of the factors of music training, pitch variability, and timbral similarity in music listening is discussed.
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Moore, Randall S. "Effects of Age, Sex, and Melodic/Harmonic Patterns on Vocal Pitch-Matching Skills of Talented 8-11-Year-Olds." Journal of Research in Music Education 42, no. 1 (April 1994): 5–13. http://dx.doi.org/10.2307/3345332.

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The purpose of this study was to determine the effects of age, sex and melodic/harmonic patterns on pitch-matching skills of children. Subjects were 128 talented singers, ages 8-11, equally divided among boys and girls, who sang 16 pitch-matching patterns; 4 patterns were melodic and 12 were harmonic. In 4 harmonic patterns, the upper tone was matched; in another 4, the lower tone was matched, and in the last set, the middle tone was matched. Two judges recorded correct/incorrect responses across 1,536 trials with 85% agreements. Results of a three-factor analysis of variance with repeated measures indicated no differences between age or sex groups and significant differences among pitch-matching tasks. More errors were made on matching the middle pitch of a chord than on any other trials. Singing the lower pitch of two tones was more difficult than matching the higher pitch of two tones or singing back a short melody. A task hierarchy for children's part-singing is suggested.
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Dissertations / Theses on the topic "Pitch variance"

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Oberhofer, Robert. "Pitch adaptive variable bitrate CELP speech coding." Thesis, University of Ulster, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264811.

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Poole, Sean. "The development of a segmented variable pitch small horizontal axis wind turbine with active pitch control." Thesis, Nelson Mandela Metropolitan University, 2013. http://hdl.handle.net/10948/d1020583.

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Small scale wind turbines operating in an urban environment produce dismal amounts of power when compared to their expected output [1-4]. This is largely due to the gusty wind conditions found in an urban environment, coupled with the fact that the wind turbines are not designed for these conditions. A new concept of a Segmented Variable Pitch (SVP) wind turbine has been proposed, which has a strong possibility to perform well in gusty and variable wind conditions. This dissertation explains the concept of a SVP wind turbine in more detail and shows analytical and experimental results relating to this concept. Also, the potential benefits of the proposed concept are mentioned. The results from this dissertation show that this concept has potential with promising results on possible turbine blade aerofoil configurations. Scaled model tests were completed and although further design optimisation is required, the tests showed good potential for the SVP concept. Lastly a proof-of-concept full scale model was manufactured and tested to prove scalability to full size from concept models. Along with the proof-of-concept full scale model, a wireless control system (to control the blade segments) was developed and tested.
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Guentert, Paul H. "A Variable Pitch Quadrotor with Quaternion Based Attitude Controller." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504882010631186.

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Harson, Andrew. "A blade angle control system for large variable pitch fans." Thesis, Queen's University Belfast, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334529.

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Cutler, Mark Johnson. "Design and control of an autonomous variable-pitch quadrotor helicopter." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/77106.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2012.
Cataloged from department-submitted PDF version of thesis. This electronic version was submitted and approved by the author's academic department as part of an electronic thesis pilot project. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 101-106).
The aerospace community, particularly in academia, has seen a recent rise in the popularity of fixed-pitch quadrotor helicopters. The fixed-pitch quadrotor is popular largely because of its mechanical simplicity relative to other hovering aircraft. This simplicity, however, places fundamental limits on the achievable actuator bandwidth and the types of maneuvers possible to fly. This thesis explores the extent to which the addition of variable-pitch propellers to a quadrotor helicopter overcomes these limitations. A detailed analysis of the potential benefits of variable-pitch propellers over fixed-pitch propellers for a quadrotor is presented. This analysis is supported with experimental testing to show that variable-pitch propellers, in addition to allowing for efficient generation of negative thrust, substantially increase the maximum rate of thrust change. A nonlinear, quaternion-based control algorithm is presented for controlling the quadrotor. An accompanying trajectory generation method is detailed with an optimization routine for finding minimum-time paths through waypoints. The control law and trajectory generation algorithms are implemented in simulation and on a custom variable-pitch quadrotor. The quadrotor attitude control is performed on the vehicle using a custom autopilot. Position and attitude measurements are made with an off-board motion capture system. Several flight tests are shown with a particular emphasis on the benefits of a variable-pitch qaudrotor over a standard fixed-pitch quadrotor for performing aggressive and aerobatics maneuvers. To the best of the author's knowledge, this work marks the first documented, autonomous variable-pitch quadrotor built for agile and aggressive flight.
by Mark Johnson Cutler.
S.M.
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Pawsey, N. C. K. Mechanical &amp Manufacturing Engineering Faculty of Engineering UNSW. "Development and evaluation of passive variable-pitch vertical axis wind turbines." Awarded by:University of New South Wales. School of Mechanical and Manufacturing Engineering, 2002. http://handle.unsw.edu.au/1959.4/18805.

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Vertical-axis wind turbines do not need to be oriented to the wind direction and offer direct rotary output to a ground-level load, making them particularly suitable for water pumping, heating, purification and aeration, as well as stand-alone electricity generation. The use of high-efficiency Darrieus turbines for such applications is virtually prohibited by their inherent inability to self-start. The provision of blade-articulation (variable-pitch blades) has been demonstrated by a number of researchers to make Darrieus turbines self-starting. One aim of this thesis is to evaluate the various concepts manifested in the numerous specific passive variable-pitch designs appearing in the literature, often without theoretical analysis. In the present work, two separate mathematical models have been produced to predict the performance of passive variable-pitch Darrieus-type turbines. A blade-element/momentum theory model has been used to investigate the relationships between the key parameter values and turbine steady-state performance. A strategy for parameter selection has been developed on the basis of these results. A free vortex wake model for passive variable-pitch turbines has been developed, allowing the study of unsteady performance. Significant reduction of average ef- ficiency in a turbulent wind is predicted for a Darrieus turbine. The improved low-speed torque of passive variable-pitch turbines is predicted to significantly improve turbulent wind performance. Two new design concepts for passive variable-pitch turbines are presented that are intended to allow greater control of blade pitch behaviour and improved turbulent wind performance. A prototype turbine featuring these design concepts has been designed, constructed and tested in the wind tunnel. As part of this testing, a technique has been developed for measuring the pitch angle response of one of the turbine blades in operation. This allows comparison of predicted and measured pitch histories and gives insight into the performance of turbines of this type. Results have demonstrated the usefulness of the mathematical models as design tools and have indicated the potential of one of the new design concepts in particular to make a vertical axis wind turbine self-starting.
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Wu, Xiaonan. "Design and Development of Variable Pitch Quadcopter for Long Endurance Flight." Thesis, Oklahoma State University, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=10813154.

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The variable pitch quadrotor is not a new concept but has been largely ignored in small unmanned aircraft, unlike the fixed pitch quadcopter which is controlled only by changing the RPM of the motors and only has about 30 minutes of total flight time. The variable pitch quadrotor can be controlled either by the change of the motor RPM or rotor blade pitch angle or by the combination of both. This gives the variable pitch quadrotor potential advantages in payload, maneuverability and long endurance flight. This research is focused on the design methodology for a variable pitch quadrotor using a single motor with potential applications for a long endurance flight. This variable pitch quadcopter uses a single power plant to power all four rotors through a power transmission system. All four rotors have the same rpm but vary the blade pitch angle to control its attitude in the air. A proof of concept variable pitch quadcopter is developed for testing the drivetrain mechanism on the vehicle and evaluating performance of the vehicle through numbers of testing.

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Wong, Richard Tik Fai. "Sub-micron pitch variable diffraction grating using nanoporous electrodes and electrophoresis of dye ions." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/12660.

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One approach to achieve non-mechanical beam steering is to use variable diffraction devices, whose intensity and direction of the outgoing diffractive orders can be actively (typically electronically) altered by modifying the optical properties of the device. Devices with sub-micron features are of particular interest when working with visible wavelengths, since such gratings can, when not activated, produce only an undeflected beam as the output and, when activated, produce diffractive orders at large deflection angles that appear and disappear entirely. Such sub-micron pitch variable diffraction gratings can be achieved by electrophoretically moving dye ions into and out of appropriately patterned transparent electrically-conductive nanoporous electrodes. This study aimed to explore their potential for use in practical devices. One significant technical hurdle associated with these devices has been the irreversible electrochemical reactions that can be induced with an applied voltage difference between the two electrodes exceeding a critical value on the order of 1 V. These reactions are undesirable as they limit the lifetime of the device. However, it was observed that when operating within such a voltage limit the optical response time is undesirably long - on the order of seconds. To better optimize the lifetime and response time of these devices, an electron tunneling model of the electrochemical reaction threshold was developed and verified. This enabled the use of a high speed drive circuit that was able to improve the response time by a factor of 50 without compromising the lifetime of the device. A prototype grating with nanoporous zinc antimonate electrodes and methylene blue dye-methanol solution was fabricated using focused ion beam milling. Modulation of a diffractive order was observed with this prototype, where the exit beam geometry was in good agreement with the model. The diffractive efficiency of the diffractive order was observed to be 3.9×10-3 when in the charged state and 7.9×10-4 when in the uncharged state with an optical switching time of 250 ms. These observations demonstrated the potential of this type of device to achieve large angular deflection and fast operating speed for non-mechanical beam steering applications.
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Yalcin, Levent. "Design And Performance Analysis Of A Variable Pitch Axial Flow Fan For Ankara Wind Tunnel." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/3/12607091/index.pdf.

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In this study, a variable pitch axial flow fan is designed and analysed for Ankara Wind Tunnel (AWT). In order to determine the loss caharacteristics of AWT, an algorithm is developed and the results are validated. Also some pressure and velocity measurements are made at the fan section to find the losses experimentally. After completion of the fan design, analyses are made at different volumetric flowrates and blade angles including the design point and the performance characteristics of the fan are obtained and thereafter the operating range of the tunnel is deterimened.
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Hou, Hoe Chen. "Performance of Variable Helix and Pitch Cutting Tools on Chatter Vibration in End Milling of Inconel 718." Thesis, Curtin University, 2018. http://hdl.handle.net/20.500.11937/73521.

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This research work carried out to investigate the performance of variable helix and pitch cutting tools on the chatter vibration of Inconel 718. The results show that variable helix and pitch cutting tool are able to enhance the stability in the milling process of Inconel 718. In addition, it also revealed that tool corner geometry plays a significant role in reducing chatter vibration, improving surface roughness and conserving longer tool life.
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Books on the topic "Pitch variance"

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Oberhofer, Robert. Pitch adaptive variable bitrate CELP speech coding. [s.l: The Author], 1998.

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Xiuli, Zheng, ed. Hai yang qian qi quan fang wei tui jin qi kong zhi xi tong: HAIYANG QIANQI QUANFANGWEI TUIJINQI KONGZHI XITONG. Beijing: Guo fang gong ye chu ban she, 2013.

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United States. National Aeronautics and Space Administration., ed. Low-order nonlinear dynamic model of IC engine-variable pitch propeller system for general aviation aircraft. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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United States. National Aeronautics and Space Administration., ed. Low-order nonlinear dynamic model of IC engine-variable pitch propeller system for general aviation aircraft. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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United States. National Aeronautics and Space Administration., ed. Low-order nonlinear dynamic model of IC engine-variable pitch propeller system for general aviation aircraft. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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United States. National Aeronautics and Space Administration., ed. Low-order nonlinear dynamic model of IC engine-variable pitch propeller system for general aviation aircraft. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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United States. National Aeronautics and Space Administration., ed. Wind-tunnel results of advanced high-speed propellers at takeoff, climb, and landing Mach numbers. [Washington, DC]: National Aeronautics and Space Administration, 1985.

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United States. National Aeronautics and Space Administration., ed. Wind-tunnel results of advanced high-speed propellers at takeoff, climb, and landing Mach numbers. [Washington, DC]: National Aeronautics and Space Administration, 1985.

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Wind-tunnel results of advanced high-speed propellers at takeoff, climb, and landing Mach numbers. [Washington, DC]: National Aeronautics and Space Administration, 1985.

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C, Gallo, and United States. National Aeronautics and Space Administration., eds. Design and dynamic simulation of a fixed pitch 56 kW wind turbine drive train with a continuously variable transmission. [Washington, DC: National Aeronautics and Space Administration, 1986.

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Book chapters on the topic "Pitch variance"

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Barabanov, Andrey, and Aleksandr Melnikov. "Trade-Off Between Speed and Accuracy for Noise Variance Minimization (NVM) Pitch Estimation Algorithm." In Speech and Computer, 714–21. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43958-7_87.

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Weik, Martin H. "variable pitch." In Computer Science and Communications Dictionary, 1880. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_20663.

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Wu, Zhenhang, Manuel Paredes, and Sébastien Seguy. "Constraint Analysis and Optimization of NES System Based on Variable Pitch Spring." In Lecture Notes in Mechanical Engineering, 162–68. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70566-4_26.

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AbstractThis study proposes the realization of a device with a pure cubic stiffness mechanism to suppress a wide range of vibrations, which is known as the Nonlinear Energy Sink. Deciding how to construct a light, reliable NES device is always a challenge. According to our design, the device can counterbalance the undesirable linear stiffness that emerges from the intrinsic property of a variable pitch spring. Our goal is to reduce the mass of the spring while keeping the same cubic stiffness. Through the multifaceted analysis of the nonlinear constraint, we try to explore the full potential of NES device to reduce its mass. Meanwhile, a global search method, Multi Start, is applied by repeatedly running a local solver. Finally, a new design with different variable pitch distribution is proposed.
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Lei, Zhang, Li Haidong, E. Chunliang, and Xu Honghua. "Modeling and Control of Variable Pitch and Variable Speed Wind Turbine." In Proceedings of ISES World Congress 2007 (Vol. I – Vol. V), 2305–8. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75997-3_466.

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Felicetti, Riccardo, Alessandro Baldini, Alessandro Freddi, Sauro Longhi, and Andrea Monteriù. "Fault Tolerant Control of a Variable Pitch Quadrotor." In Lecture Notes in Control and Information Sciences - Proceedings, 235–55. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-85318-1_15.

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Benetos, Emmanouil, and Simon Dixon. "Temporally-Constrained Convolutive Probabilistic Latent Component Analysis for Multi-pitch Detection." In Latent Variable Analysis and Signal Separation, 364–71. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-28551-6_45.

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Van, Tan Luong, Buu Pham Nhat Tan Nguyen, Trung Hieu Truong, and Tran Thanh Trang. "Improved Pitch Angle Control for Variable-Speed Wind Turbine System." In AETA 2013: Recent Advances in Electrical Engineering and Related Sciences, 103–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41968-3_12.

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Miliket, Temesgen Abriham, Mesfin Belayneh Ageze, and Muluken Temesgen Tigabu. "Numerical Investigations of Variable Pitch Straight-Bladed H-Darrieus VAWT." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 565–83. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-93712-6_38.

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Krishnan, S., and G. K. Sadekar. "Variable Pitch Tube Layout Concept for Shell and Tube Heat Exchanger." In Design and Operation of Heat Exchangers, 64–73. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84450-8_6.

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Xie, Weicai, Shibo Liu, Yaofeng Wang, Hongzhi Liao, and Li He. "Wind Power Variable-Pitch DC Servo System Based on Fuzzy Adaptive Control." In Advances in Intelligent Systems and Computing, 52–59. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8462-6_6.

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Conference papers on the topic "Pitch variance"

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Teodorescu, Horia-Nicolai. "Using local variance, Allan- and Hadamard variances in speech analysis – Pitch analysis." In 2019 International Symposium on Signals, Circuits and Systems (ISSCS). IEEE, 2019. http://dx.doi.org/10.1109/isscs.2019.8801757.

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Wei, Xiaopeng, Lasheng Zhao, Qiang Zhang, and Jing Dong. "A Pitch Estimation Algorithm Based on the Variance Analysis." In 2008 3rd International Conference on Innovative Computing Information and Control. IEEE, 2008. http://dx.doi.org/10.1109/icicic.2008.75.

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Moo-Ho Bae, Sung-Bae Park, YoungKyoung Kim, Deokgon Kim, and Sung-Jae Kwon. "Minimum variance beamforming using fine pitch array probe with limited aperture size." In 2012 IEEE International Ultrasonics Symposium. IEEE, 2012. http://dx.doi.org/10.1109/ultsym.2012.0319.

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Gu, Hung-Yan, and Kai-Wei Jiang. "A pitch-contour generation method combining ANN, global variance, and real-contour selection." In 2015 International Conference on Machine Learning and Cybernetics (ICMLC). IEEE, 2015. http://dx.doi.org/10.1109/icmlc.2015.7340954.

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Doi, Masayoshi, Kazuhisa Nagamoto, and Tetsuya Takehira. "A study of ship's mooring method with Controllable Pitch Propeller (CPP) by applying generalized minimum variance control." In 2013 European Control Conference (ECC). IEEE, 2013. http://dx.doi.org/10.23919/ecc.2013.6669167.

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Kingston, Todd A., and Theodore J. Heindel. "Visualization and Composition Analysis to Quantify Mixing in a Screw Pyrolyzer." In ASME 2013 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fedsm2013-16054.

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Characterizing the mixing effectiveness of systems or processes in granular applications is difficult due to ineffective sampling procedures and a lack of quantifiable measurement techniques. The mixing effectiveness of a screw pyrolyzer consisting of a binary mixture of 500–6350 μm red oak chips and 300–500 μm glass beads is evaluated using optical visualization and composition analysis techniques. The mass fraction of binary mixture samples is determined and the weighted sample variance from four outlet ports is used to evaluate the mixing effectiveness. The effect of dimensionless screw pitch on the mixing effectiveness is investigated at levels of p/D = 0.75, 1.25, and 1.75. Optical visualization is captured across the entire mixing region’s periphery allowing qualitative observations to be made, leading to the visual observation that increasing the dimensionless screw pitch increases the mixing effectiveness. Quantitative composition analysis utilizing a one-way analysis of variance (ANOVA) statistical model confirms that increasing the dimensionless screw pitch from 0.75 to 1.25 results in a significant increase in mixing effectiveness. However, diminishing increases in mixing effectiveness were shown as the dimensionless screw pitch increased from 1.25 to 1.75, and statistically these two conditions could not be distinguished given the amount of data in this study. Results are compared to previous granular mixing measurement techniques found in the literature, and similar results are reported.
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Boyd, Nicholas, and David Molyneux. "Analysis of Variance to Determine the Effect of Hull Form Parameters on Resistance and Seakeeping Performance for PSV Hulls." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54542.

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Throughout the world many Platform Supply Vessel designs have been proposed as the optimal form for their given operating environment, but evaluating these claims has been difficult due to a poor understanding of the relationships between hull form shapes and performance for these vessels. This paper presents the results of analysis aimed at determining these relationships. Results of CFD calculations to determine the Effective Horsepower/tonne for a series of PSV designs were presented in the paper A step towards an optimum PSV Hull form. This paper presents results for 16 separate hull forms, which were designed as each possible combination of four two-level hull form parameters. The hull form features considered were bow shape (vertical stem or bulbous), flat of bottom (flat or deadrise), length of parallel mid body (short or long), and stern shape (convention or integrated); resistance was calculated at two typical operating speeds (10 and 14 knots). This set of results was favourable for analysis using the statistical design of experiments technique: analysis of variance, which was used to determine the relationship between the hull and resistance performance. The same hull form series was used to study the effects of the hull form parameters on motions in head waves. A 2 level factorial experiment was designed based on the hull parameters with the heave and pitch response calculated using the potential flow ship motion prediction code Shipmo3D, for each of two representative wave conditions (summer light seas and winter heavy seas) at the zero speed and 10 knot operating speed. Analysis of variance was used to analyze the heave and pitch responses measured, and was used to determine the relationship between each hull parameter and each response. In both cases a 5% F-test was used to determine the significance of each parameter studied, and the significant effects were analyzed to determine their contributions to the overall model of the data. The results have found the relationships between the hull design parameters and the Effective Horespower/tonne, heave, and pitch response of the vessel, indicating which factors provide the largest contribution to minimizing each response. The interaction effects between factors were also examined to allow for a generalized understanding of the resulting effect of selecting one hull parameter over another. A numerical model combining all significant factors was fitted to the data, allowing for multiple objective optimization to determine which hull forms provide the most desirable performance for each response.
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Jeong, Youn-Ju, Min-Su Park, Du-Ho Lee, and Young-Jun You. "Experimental Study on Hydrodynamic Behaviors of Hybrid Floating Body With Cylinders." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23179.

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In this study, in order to evaluate hydrodynamic behaviors of the hybrid floating body with cylinders, experimental studies were carried out. At first, two small-scale models of pontoon and hybrid with scale factor 1:75 were fabricated and tested under the wave loadings. Based on the measured data, hydrodynamic motions of the pitch, surge, drift force, and free decay motions were evaluated and compared with each other. As the result of small-scale test, it was found that the pitch motion is more sensitive to the wave period than the surge and drift motions. Whereas the pitch motion increased by increasing of the wave period, the surge and drift motion presented a small variance according to the increasing of the wave period for the both models of pontoon and hybrid. Also, it was found that the hybrid floating body significantly influenced on the hydrodynamic motions under the wave loadings. The pitch motion reduced significantly for the all wave period cases. The surge and drift motion reduced over the wave period of 0.982sec. Damping properties of hybrid model indicated more favorable in terms of logarithmic decrement and damping ratio because of the shape effects. Therefore, it was expected that the hybrid model of this study contribute to improve serviceability and safety of floating body as decreasing hydrodynamic motions.
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Zhang, Lichao, Zhou Zhao, Yi Ren, and Liqun Deng. "EditSinger: Zero-Shot Text-Based Singing Voice Editing System with Diverse Prosody Modeling." In Thirty-First International Joint Conference on Artificial Intelligence {IJCAI-22}. California: International Joint Conferences on Artificial Intelligence Organization, 2022. http://dx.doi.org/10.24963/ijcai.2022/625.

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Zero-shot text-based singing editing enables singing voice modification based on the given edited lyrics without any additional data from the target singer. However, due to the different demands, challenges occur when applying existing speech editing methods to singing voice editing task, mainly including the lack of systematic consideration concerning prosody in insertion and deletion, as well as the trade-off between the naturalness of pronunciation and the preservation of prosody in replacement. In this paper we propose EditSinger, which is a novel singing voice editing model with specially designed diverse prosody modules to overcome the challenges above. Specifically, 1) a general masked variance adaptor is introduced for the comprehensive prosody modeling of the inserted lyrics and the transition of deletion boundary; and 2) we further design a fusion pitch predictor for replacement. By disentangling the reference pitch and fusing the predicted pronunciation, the edited pitch can be reconstructed, which could ensure a natural pronunciation while preserving the prosody of the original audio. In addition, to the best of our knowledge, it is the first zero-shot text-based singing voice editing system. Our experiments conducted on the OpenSinger prove that EditSinger can synthesize high-quality edited singing voices with natural prosody according to the corresponding operations.
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Ali, Mariam N., and Hassan El-Hofy. "Experimental Investigation of Vibration Assisted Helical Milling of 7075 Aluminum Alloy." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2738.

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Abstract Vibration-assisted helical milling (VAHM) is a novel machining process in which an axial ultrasonic vibration is superimposed to the milling cutter. The current work aims to experimentally investigate the influence of applying ultrasonic vibration on the machining performance during helical milling of 7075 aluminum alloy. A full factorial design of experiment is first implemented. Analysis of Variance (ANOVA) is then performed to study the effect of rotational speed (n), tangential feed (Ft), helical pitch (P) and ultrasonic vibration on the process performance. The output response variables considered in this investigation are cutting forces (axial, tangential and radial), torque and hole quality in terms of out-of-roundness, hole size error and surface roughness. The results show that the best cutting conditions to minimize the cutting forces and the diameter deviation are the rotational speed of 5000 rpm, tangential feed of 100 mm/min and helical pitch of 0.1 mm/rev with the assistance of the ultrasonic vibration. The ultrasonic vibration improves the performance of helical milling by decreasing the axial cutting forces.
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Reports on the topic "Pitch variance"

1

Bartkowski, Peter T., and Paul R. Berning. Inductance Calculations of Variable Pitch Helical Inductors. Fort Belvoir, VA: Defense Technical Information Center, July 2015. http://dx.doi.org/10.21236/ada625194.

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Gallo, C., R. Kasuba, A. Pintz, and J. Spring. Design and dynamic simulation of a fixed pitch 56 kW wind turbine drive train with a continuously variable transmission. Office of Scientific and Technical Information (OSTI), March 1986. http://dx.doi.org/10.2172/6684402.

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