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PAPERS |
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Perceptual Evaluation of Speech Quality (PESQ): The New ITU Standard for End-to-End Speech Quality Assessment Part I-Time-Delay Compensation
(PDF-133K) |
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Antony W. Rix, Michael P. Hollier, Andries P. Hekstra, and John G. Beerends |
755 |
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Creating a model for the subjective speech quality in modern telephone
networks, which includes voice-over Internet, presents special problems
because of time-varying delay during transmission. Including delay
compensation in the evaluation algorithm is required in order to match
subjective judgments. The paper explores the numerous origins of
variable delay and its perceptual influence on subjective quality. Delay
can only be considered to be constant over relatively short intervals. |
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Perceptual Evaluation of Speech Quality (PESQ): The New ITU Standard for End-to-End Speech Quality Assessment Part II-Psychoacoustic Model
(PDF-135K) |
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John G. Beerends, Andries P. Hekstra, Antony W. Rix, and Michael P. Hollier |
765 |
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Using delay compensation, as described in Part I above, the authors
present a full psychoacoustic model for the perceptual evaluation of
speech quality in telephone systems to predict the end-to-end judgment
of subjective degradation. The final quality score is a combination of
many independent measures. Although extensive empirical testing of the
cognitive model showed that it provided a much better measure of
degradation than previous approaches, additional factors are yet to be
included in the model. |
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Improved Microphone Array Configurations for Auralization of Sound Fields by Wave-Field Synthesis
(PDF-395K) |
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Edo Hulsebos, Diemer de Vries, and Emmanuelle Bourdillat |
779 |
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In order to provide accurate auralization when reproducing an acoustic
field in a large space, significant amounts of impulse response data are
required. The paper investigates and compares three classes of
microphone array configurations: linear, cross, and circular. The
proposed circular configuration, the basis for wave-field synthesis,
provides better spatial reconstruction over a wider area because it
avoids diffraction effects present at the end points in the other
configurations. |
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Crossover Systems in Digital Loudspeakers
(PDF-221K) |
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S. C. Busbridge, Y. Huang, and P. A. Fryer |
791 |
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Implementing a crossover network for a digital loudspeaker allows the
individual binary currents to be filtered into two spectral channels
because the operations of digital-to-analog conversion and filtering can
be interchanged. The paper explores a mathematical simulation of a
proposed digital loudspeaker using a separate voice coil for each bit.
Actual measurements from an experimental system are then used to support
the results. |
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STANDARDS AND INFORMATION DOCUMENTS |
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AES Standards Committee News
(PDF-25K) |
799 |
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Digital interfacing; digital libraries; loudspeaker modeling and
measurement; high-performance serial bus |
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FEATURES |
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22nd Conference Report, Espoo
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804 |
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816 |
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858 |
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864 |
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