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Journal of the AES


2002 October - Volume 50 Number 10

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Papers

PAPERS
Perceptual Evaluation of Speech Quality (PESQ): The New ITU Standard for End-to-End Speech Quality Assessment Part I-Time-Delay Compensation (PDF-133K)  
Antony W. Rix, Michael P. Hollier, Andries P. Hekstra, and John G. Beerends    755
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)  
John G. Beerends, Andries P. Hekstra, Antony W. Rix, and Michael P. Hollier    765
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)  
Edo Hulsebos, Diemer de Vries, and Emmanuelle Bourdillat    779
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)  
S. C. Busbridge, Y. Huang, and P. A. Fryer    791
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
AES Standards Committee News (PDF-25K)    799
Digital interfacing; digital libraries; loudspeaker modeling and measurement; high-performance serial bus  
 
FEATURES
22nd Conference Report, Espoo (PDF-2.8MB)    804
New Officers 2002/2003 (PDF-140K)    814
Review of Society's Sustaining Members (PDF-3.4MB)    816
Education News (PDF-67K)    838
24th Conference, Banff, Call for Contributions (PDF-21K)    851
 
DEPARTMENTS
News of the Sections (PDF-146K)    839
Sound Track (PDF-12K)    844
Upcoming Meetings (PDF-12K)    844
New Products and Developments (PDF-72K)    845
Available Literature (PDF-12K)    847
Membership Information (PDF-47K)    848
Advertiser Internet Directory (PDF-47K)    849
In Memoriam (PDF-109K)    850
AES Special Publications (PDF-87K)    853
Sections Contacts Directory (PDF-33K)    858
AES Conventions and Conferences (PDF-38K)    864
 
EXTRAS
Cover & Sustaining Members List (PDF-32K)    
VIP List & Editorial Staff (PDF-26K)    
Ads In This Issue (HTML)    
Download Entire Journal As One PDF (PDF-6.1MB)    
 
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