1996 SEPTEMBER, VOLUME 44 NUMBER 9

CONTENT

PAPERS

Generalized Transaural Stereo and Applications
Jerry Bauck and Duane H. Cooper p. 683
Precisely defined audio signals at the listener's ears using loudspeakers are discussed, including various applications of several other possible systems. The discussion covers several interaural delay compensation methods, which with other system features are designed to present the listener with a three-dimensional audio image. Historical approaches in the area of precise three-dimensional sound reproduction are also reviewed.

Lossless Coding for Audio Discs
Peter Craven and Michael Gerzon p. 706
Lossless coding of data fully retains the original information. This method is free of the argument that can arise when using lossy compression schemes, which may discard some data as not important. Previously developed lossless data-compressing schemes are reviewed and their data- reducing advantages indicated. This paper will serve both the neophyte and digital practitioner well with its concise analysis of audio data reduction methods.

Error Correction in Audio Amplifiers
Dimitri Danyuk and George Pilko p. 721
The authors compare two generalized amplifier correction topologies and find that both exhibit the same sensitivities to changes in the main path as does negative feedback if analyzed on the basis of loop gain. Feedforward frequency compensation has no substantial advantages over conventional frequency compensation methods in these findings. Regarding the phase margin that can be realized at a given closed-loop cutoff frequency, Miller compensation remains unmatched when compared to feedforward and pole-zero compensation.

ENGINEERING REPORTS

An Alternative Algorithm for Estimating and Tracking Talker Location by Microphone Arrays
Ming Zhang and M. H. Er p. 729
Estimating and tracking talker locations when using microphone arrays are valuable tools in improving the overall quality of microphone utility in teleconferencing systems. Directed arrays can reduce reverberation and other extraneous unwanted sounds from the desired audio path by determining the direction of the talker's location and subsequently steering the microphone array toward the talker. A comparison is made to known radar methods, which points out that the problems in determining directionality and range of audio sources are more complex because of their wide frequency range.

STANDARDS AND INFORMATION DOCUMENTS

AES Standards Committee News p. 737
101st Convention meetings

DRAFT REVISED AES11-xxxx, AES Recommended practice for digital audio engineering Synchronization of digital audio equipment in studio operations (insert)

FEATURES

101st Convention Preview: Los Angeles p. 742

Calendar p. 744
Exhibitors p. 746
Exhibit Previews p. 752

Updates and Corrections to the 1995/1996 AES International Sections Directory p. 790

Departments

Review of Acoustical Patents p. 738
News of Sections p. 780
Sound Track p.785
Upcoming Meetings p. 788
Available Literature p. 788
Membership Information p. 791
In Memoriam p. 796
AES Annual Report p. 799
AES Special Publications p. 800
Sections Contacts Directory p. 804
AES Conventions and Conferences p. 808