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Objective Modeling of Speech Quality with a Psychoacoustically Validated Auditory Model
Martin Hansen and Birger Kollmeier 395

Objective measurement of low-bit rate speech coding algorithms using a quantitative psychoacoustical signal processing model has been developed and tested. This model objectively measures the perceptually relevant deviations between the transmitted degraded signal and the corresponding reference signal. A quality measure can be derived from a comparison of these two signals. The performance of this new measurement system was validated by comparing it to alternative models and the PSQM/P.861 measurement protocol.

Design of Three Unusual Loudspeakers for the High Court of Australia
Glenn Leembruggen 410

Unique, targeted loudspeaker systems were used to design the High Court of Australia's sound reinforcement system. Three distinct loudspeaker designs were employed: one is a distributed array of dipole loudspeakers, the second an acoustically curved line array, and the third a short tapered line array. The final performance of the loudspeaker system has satisfied both the design goals and the users' expectations.

Loudspeakers on Damped Pipes
G. L. Augspurger 424

A computer analog to model transmission line loudspeaker systems was developed and validated by comparing it to a variety of designs. Basic performance relationships similar to the Thiele-Small analysis of vented boxes are presented. It is also shown that Locanthi's horn analog is well-suited for modeling transmission line loudspeaker systems using this model. The circuit can accommodate arbitrary flare shapes and allows damping to be included in any combination of series or parallel losses. Using one of the new alignments, a transmission line loudspeaker system can be designed to match the frequency response and efficiency of a comparable closed box, while reducing cone excursion.


A Time-Scale Modification Algorithm Based on the Subband Time-Domain Technique for Broad-Band Signal Applications
Roland K. C. Tan and Amerson H. J. Lin 436

Time-domain digital time-scale modification algorithms using the overlap-and-add technique were developed previously mainly for speech signals and may not perform well for broad-band audio signals. A new algorithm to overcome the problems of the older formats has been proposed. The focus in this study has been on the time-scale modification for varying the tempo of audio signals or the rate of speech articulation without altering the pitch of musical instruments or speakers' or singers' voices.


AES-6id-2000 AES information document for digital audio - Personal computer audio
quality measurements

AES Standards Committee News Diffusion; fiber-optic connectors; synchronization; patch panels;
grounding; polarity


Audio in the New Millennium
James A. Moorer 490

Updates and Corrections to the 1999/2000 International Sections Directory 499

Education News 500


Review of Acoustical Patents 487

News of the Sections 502

Sound Track 506

New Products and Developments 508

Available Literature 510

Upcoming Meetings 511

Membership Information 512

Advertiser Internet Directory 513

AES Special Publications 517

Sections Contacts Directory 522

AES Conventions and Conferences 528

FPOFor the cover:


spine:VOLUME 48 NUMBER 5 2000 MAY