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PAPERS |
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A Model of Loudness Applicable to Time-Varying Sounds
(PDF-128K) |
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Brian R. Glasberg and Brian C. J. Moore |
331 |
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A previous model for computing the subjective loudness of steady-state
sounds from their spectra has been extended to include time variations.
After filtering the input signal to mimic the frequency response of the
outer and middle ear, a fast Fourier transform (FFT) of the resulting
signal is then used to compute an instantaneous loudness. The overall
loudness uses attack and release times to convert the instantaneous
loudness to the subjective experience of the listeners. The model gives
good results with modulated signals over a wide range of rates. |
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Perception of Reverberation Time in Small Listening Rooms
(PDF-89K) |
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T. I. Niaounakis and W. J. Davies |
343 |
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Spatial parameters, such as reverberation time, are typically used for
large spaces and have not been extensively applied in a small room. This
study determined that listeners' sensitivity to changes in reverberation
time was on the order of 40 ms. Two methods were used: changing
absorption in a real space and simulating changes from a dummy head with
delay headphone reproduction. |
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ENGINEERING REPORTS |
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An IIR Synthesis Method for Plucked-String Instruments with Embedded Portamento
(PDF-558K) |
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Alvin W. Y. Su, Wei-Chen Chang, and Rei-Wen Wang |
351 |
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The normal wavetable technique for synthesizing the portamento of
plucked-string instruments, such as the ancient Chinese San-Sien, fails
because of the wide frequency range. A new approach, which uses a
wavetable to drive an infinite-impulse-response (IIR) filter whose
coefficients have been modeled as a neural network training algorithm,
provides accurate synthesis of these unusual sounds. The method assumes
that the sounds are quasi-periodic, which also makes the method
appropriate for certain wind instruments. Signal processing requirements
are not particularly problematic. |
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Dipole Loudspeaker Response in Listening Rooms
(PDF-198K) |
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James M. Kates |
363 |
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A dipole loudspeaker, which radiates sound energy from both the front
and rear surfaces, appears as a velocity source, whereas the
conventional monopole loudspeaker appears as a pressure source. Although
the dipole loudspeaker can provide better auditory localization
accuracy, it is more sensitive to room placement and angular
orientation.Using a two-dimensional simulation, the author explores the
importance of room response and coloration of the reproduced sounds. |
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LETTERS TO THE EDITOR |
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Comments on In Memoriam Roy Allison
(PDF-8K) |
375 |
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CORRECTIONS |
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Correction to Content Page
(PDF-8K) |
375 |
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STANDARDS AND INFORMATION DOCUMENTS |
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AES Standards Committee News
(PDF-34K) |
376 |
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Digital audio measurements; loudspeaker modeling; audio connections |
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FEATURES |
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Managing Change: The Challenge of Rights Management in the New Millennium
Keith Hill
(PDF-95K) |
380 |
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Audio for Games Martin Wilde
(PDF-291K) |
392 |
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114th Convention, Amsterdam, Call for Papers
(PDF-13K) |
417 |
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DEPARTMENTS |
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News of the Sections
(PDF-75K) |
397 |
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Upcoming Meetings
(PDF-75K) |
401 |
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Sound Track
(PDF-14K) |
402 |
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New Products and Developments
(PDF-182K) |
404 |
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Available Literature
(PDF-12K) |
407 |
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Membership Information
(PDF-141K) |
408 |
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Advertiser Internet Directory
(PDF-144K) |
410 |
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AES Special Publications
(PDF-122K) |
411 |
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In Memoriam
(PDF-16K) |
416 |
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Sections Contacts Directory
(PDF-38K) |
418 |
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AES Conventions and Conferences
(PDF-131K) |
424 |
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EXTRAS |
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Cover & Sustaining Members List
(PDF-32K) |
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VIP List & Editorial Staff
(PDF-32K) |
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