| 2002 October, Vol 50 Number 10 |
CONTENT
PAPERS
Perceptual Evaluation of Speech Quality (PESQ): The New ITU Standard for End-to-End Speech Quality Assessment Part I-Time-Delay Compensation
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.
Perceptual Evaluation of Speech Quality (PESQ): The New ITU Standard for End-to-End Speech Quality Assessment Part II-Psychoacoustic Model
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.
Improved Microphone Array Configurations for Auralization of Sound Fields by Wave-Field Synthesis
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.
Crossover Systems in Digital Loudspeakers
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.
STANDARDS AND INFORMATION DOCUMENTS
AES Standards Committee News 799
Digital interfacing; digital libraries; loudspeaker modeling and measurement; high-performance serial bus
FEATURES
22nd Conference Report, Espoo 804
New Officers 2002/2003 814
Review of Society's Sustaining Members 816
Education News 838
24th Conference, Banff, Call for Contributions 851
DEPARTMENTS
News of the Sections 839
Sound Track 844
Upcoming Meetings 844
New Products and Developments 845
Available Literature 847
Membership Information 848
Advertiser Internet Directory 849
In Memoriam 850
AES Special Publications 853
Sections Contacts Directory 858
AES Conventions and Conferences 864
FPO For the cover:
2002 October, Vol 50 Number 10
spine: 2002 October, Vol 50 Number 10