Pierce, Jeff
Permanent URI for this collectionhttps://hdl.handle.net/10222/22102
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Item Open Access Periodicity and pitch perception(1991-10) Pierce, J. R.There has been experimental evidence pointing to at least two pitch mechanisms, the first involving low-order harmonics that are resolved along the basilar membrane, and the second a periodicity mechanism that depends only on the repetition rate of the time waveform on the basilar membrane. If this time waveform is derived from repeated bursts of sinusoidal tone, the second mechanism might be the sole pitch mechanism. It is found that this can be so up to rates as high as 250 bursts of 4978-Hz tone per second. The stimuli used are periodic patterns of equally spaced tone bursts, with either successive tone bursts in the same phase, or every fourth tone burst 180 out of phase with respect to the rest. Up to a critical transitional rate of tone bursts a second, the two sequences sound exactly the same, despite their different fundamental frequencies and frequency separation of harmonics. Critical rate data are given for sinusoidal bursts of seven different frequencies. Critical rates appear to be closely related to the critical bandwidth. Pitch matching appears to be consistent with these observations; it is on rate below the critical rate and can be on fundamental frequency above the critical rateItem Open Access A passive nonlinear digital filter design which facilitates physics-based sound synthesis of highly nonlinear musical instruments(Acoust. Soc. America through AIP, 1997-02) Pierce, J. R.; Van Duyne, S. A.Recent work has led to highly efficient physics-based computational models of wave propagation in strings, acoustic tubes, membranes, plates, and rooms using the digital waveguide filter, the 2-D digital waveguide mesh, and the 3-D tetrahedral digital waveguide mesh, all of which are suitable for real-time musical synthesis applications. A simple first-order nonlinear filter structure derived from a passive nonlinear impedance circuit is described which extends the usefulness of these models, and which avoids the difficulties of energy conservation when memoryless nonlinearities are inserted in resonant feedback systemsItem Open Access Periodicity and pitch perception(1991-10) Pierce, J. R.There has been experimental evidence pointing to at least two pitch mechanisms, the first involving low-order harmonics that are resolved along the basilar membrane, and the second a periodicity mechanism that depends only on the repetition rate of the time waveform on the basilar membrane. If this time waveform is derived from repeated bursts of sinusoidal tone, the second mechanism might be the sole pitch mechanism. It is found that this can be so up to rates as high as 250 bursts of 4978-Hz tone per second. The stimuli used are periodic patterns of equally spaced tone bursts, with either successive tone bursts in the same phase, or every fourth tone burst 180 out of phase with respect to the rest. Up to a critical transitional rate of tone bursts a second, the two sequences sound exactly the same, despite their different fundamental frequencies and frequency separation of harmonics. Critical rate data are given for sinusoidal bursts of seven different frequencies. Critical rates appear to be closely related to the critical bandwidth. Pitch matching appears to be consistent with these observations; it is on rate below the critical rate and can be on fundamental frequency above the critical rateItem Open Access A passive nonlinear digital filter design which facilitates physics-based sound synthesis of highly nonlinear musical instruments(Acoust. Soc. America through AIP, 1997-02) Pierce, J. R.; Van Duyne, S. A.Recent work has led to highly efficient physics-based computational models of wave propagation in strings, acoustic tubes, membranes, plates, and rooms using the digital waveguide filter, the 2-D digital waveguide mesh, and the 3-D tetrahedral digital waveguide mesh, all of which are suitable for real-time musical synthesis applications. A simple first-order nonlinear filter structure derived from a passive nonlinear impedance circuit is described which extends the usefulness of these models, and which avoids the difficulties of energy conservation when memoryless nonlinearities are inserted in resonant feedback systemsItem Open Access Jeff Pierce CV(2013-08-07) Pierce, JeffItem Open Access Detecting thin cirrus in Multiangle Imaging Spectroradiometer aerosol retrievals(2010-04) Pierce, Jeffrey R.; Kahn, Ralph A.; Davis, Matt R.; Comstock, Jennifer M.No abstract available.Item Open Access Global evaluation of CCN formation by direct emission of sea salt and growth of ultrafine sea salt(2006-03) Pierce, JR; Adams, PJNo abstract available.Item Open Access Relating atmospheric and oceanic DMS levels to particle nucleation events in the Canadian Arctic(2011-11) Chang, Rachel Y. -W; Sjostedt, Steven J.; Pierce, Jeffrey R.; Papakyriakou, Tim N.; Scarratt, Michael G.; Michaud, Sonia; Levasseur, Maurice; Leaitch, W. Richard; Abbatt, Jonathan P. D.No abstract available.