1996 JUNE, VOLUME 44 NUMBER 6

CONTENT

PAPERS

Binaural Technique: Do We Need Individual Recordings?
Henrik Møller, Michael Friis Sørensen, Clemen Boje Jensen, and Dorte Hammershøi p. 451
In this study of individual binaural recordings, tiny microphones are fitted to the ear canals of the test individual. Subsequent recordings are made using this setup for a like series of test subjects. The test subjects are then called upon to ascertain their ability to perceive the spatial and directional qualities of their individual recordings compared to other recordings made in the test group. The findings indicate fewer mean localization errors from individual binaural recordings. Nonindividual binaural recordings resulted in an increased number of distance errors.

Modeling the Nonlinearities in Horn Loudspeakers
Wolfgang Klippel p. 470
Nonlinear parameters of horn loudspeakers are examined using a power series expansion while second- and third-order system functions are developed using the Volterra series. The results are used to predict the harmonic and intermodulation products in the radiated sound pressure signal from horn loudspeakers. These predicted criteria can be used to make systematic investigations into the audibility of nonlinear distortions in horn drivers by implementing block-oriented models in digital signal processors.

Computation and Memory Tradeoffs with Multiple Wavetable Interpolation
Andrew Horner p. 481
A multiple wavetable interpolation technique is employed to match acoustic instrument tones via a genetic algorithm optimization in which the user defines the number of oscillators and wavetables to be used. Cross-fading between multiple wavetables interpolates the data, thus saving compilation time. Analysis of the findings indicates that using more than four oscillators results in diminishing returns.

Design of Logarithmically Spaced Constant-Directivity Transducer Arrays
Menno van der Wal, Evert W. Start, and Diemer de Vries p. 497
The effectiveness of microphone and loudspeaker transducer arrays generally has been limited by beamwidths that vary with frequency. Here a new scheme is described for a broadband, controllable transducer array, which improves performance in many applications. Software control makes the system flexible for a variety of broad-based applications.

CORRECTIONS

Correction to "Constant-Beamwidth One-Octave Bandwidth End-Fire Line Array of Loudspeakers" p. 507

STANDARDS AND INFORMATION DOCUMENTS

AES Standards Committee News p. 508
Interconnections; style for preparation of standards

FEATURES

AES 6th Australian Regional Convention Preview: Melbourne p. 514

• Calendar p. 516
• Exhibitors p. 518
• Exhibitor Previews p. 518

Updates and Corrections to the 1995/1996 AES International Sections Directory p. 521

DEPARTMENTS

Review of Acoustical Patents p. 511
News of the Sections p. 522
Sound Track p. 530
Upcoming Meetings p. 532
Available Literature p. 533
Membership Information p. 534
In Memoriam p. 542
AES Special Publications p. 544
Sections Contacts Directory p. 548
AES Conventions and Conferences p. 552