AES Journal

Journal of the AES

2011 December - Volume 59 Number 12

Editor’s Note and Reviewer List

Author: Bozena Kostek

Page: 923

Download: PDF (90KB)


Interactive Teleconferencing Combining Spatial Audio Object Coding and DirAC Technology


In teleconferencing applications with multiple participants, it would be desirable to create the perception of a real meeting with each speaker in a specific perceived location. This paper describes how Directional Audio Coding (DirAC) can be used as a front end to MPEG Spatial Audio Object Coding (SAOC) to achieve that goal. A novel parameter transcoder provides an efficient way of combining the two technologies. Reproduction of the virtual environment, where each talker exists in a virtual location, can be achieved using headphones or loudspeakers. Subjective tests on different simple and optimized versions were performed, many of which were rated as “good” on the MUSHRA scale.

  Download: PDF (HIGH Res) (543KB)

  Download: PDF (LOW Res) (369KB)

  Be the first to discuss this paper

Sparse Frequency-Domain Reverberator


There are many topologies for implementing the late part of artificial reverberation, each of which is a unique trade-off among perceived quality, computational cost, and parameter flexibility. A new approach, which assumes that the late reverberation can be described as a stochastic process, applies the reverberation in frequency bands using a combination of a feedback loop and an efficient sparse decorrelator. Listening tests with ten experts confirmed that the new reverberator topology has a perceived quality that was mostly equivalent to the idealized reverberation using decaying Gaussian noise response in frequency bands.

  Download: PDF (HIGH Res) (1.4MB)

  Download: PDF (LOW Res) (751KB)

  Be the first to discuss this paper

A Diffractive Study on the Relation between Finite Baffle and Loudspeaker Measurement


Measuring the frequency response of a driver mounted in an idealized infinite baffle is desirable even though the IEC specifies a finite baffle with fixed dimensions. Finite baffles confound direct radiation with diffracted radiation. Based on quantitative computations using the extended Boit-Tolstoy-Medwin technique, a correction process compensates the measured response with a finite baffle to the result that would be obtained with an ideal infinite baffle. Experimental results show the validity of the approach.

  Download: PDF (HIGH Res) (1.5MB)

  Download: PDF (LOW Res) (858KB)

  Be the first to discuss this paper

Impulse Response Measurement of Nonlinear Systems: Properties of Existing Techniques and Wide Noise Sequences


Methods for measuring impulse responses have problems when the system under test contains elements that are nonlinear. Before exploring a new approach to the problem, the authors explain the effects of nonlinearities on traditional impulse response techniques. They show how wide maximum-length sequences have advantages over existing techniques for measuring the linear component of the response. Then they illustrate how these advantages can be applied to multiple noise sequence measurements to measure nonlinear behavior using the diagonal Volterra series expansion of the impulse response of general nonlinear systems. This approach better characterizes the system being measured.

  Download: PDF (HIGH Res) (2.3MB)

  Download: PDF (LOW Res) (364KB)

  Be the first to discuss this paper

Standards and Information Documents

AES Standards Committee News

Page: 964

Download: PDF (3.1MB)


131st Convention Report, New York

Page: 968

Download: PDF (1.4MB)

131st Convention Exhibitors

Page: 980

Download: PDF (306KB)

45th Conference Preview, Helsinki, Finland

Page: 984

Download: PDF (432KB)

Live Sound: Things to Get Right


Live sound featured large in the technical program of the 131st Convention, held in October in New York, with a series of workshops organized by Henry Cohen and Mac Kerr. Although wireless microphone issues took up quite a lot of the sessions, owing to the changes taking place in that field, this article concentrates on some of the other areas of live sound that we have not covered as much in the past. It includes practical tips from a workshop entitled “Ten Things to Get Right,” as well as the use of subwoofer arrays and beamsteering.

  Download: PDF (417KB)

  Be the first to discuss this feature

Education News

Page: 998

Download: PDF (176KB)

48th Call for Papers, Munich

Page: 1005

Download: PDF (67KB)

133rd Call for Papers, San Francisco

Page: 1006

Download: PDF (66KB)

Call for Nominations for the Board of Governors

Page: 1007

Download: PDF (25KB)

Call for Awards Nominations

Page: 1008

Download: PDF (22KB)

AES Bylaws

Page: 1016

Download: PDF (55KB)

Index to Volume 59

Page: 1020

Download: PDF (121KB)


Section News

Page: 991

Download: PDF (679KB)

Products and Developments

Page: 1000

Download: PDF (306KB)

Advertiser Internet Directory

Page: 1001

Download: PDF (200KB)


Page: 1002

Download: PDF (97KB)

Annual Report

Page: 1009

Download: PDF (19KB)

131st Convention Papers Order Form

Page: 1010

Download: PDF (53KB)

131st Convention Audio MP3 Order Form

Page: 1015

Download: PDF (142KB)

Membership Information

Page: 1036

Download: PDF (52KB)

Section Contacts Directory

Page: 1040

Download: PDF (118KB)

AES Conventions and Conferences

Page: 1048

Download: PDF (65KB)


Table of Contents

Download: PDF (82KB)

Cover & Sustaining Members List

Download: PDF (30KB)

AES Officers, Committees, Offices & Journal Staff

Download: PDF (56KB)

AES - Audio Engineering Society