AES Journal

Journal of the AES

2010 July/August - Volume 58 Number 7/8


Parametric Spring Reverberation Effect


The unique sonic quality of spring reverberation, and its historical importance in many musical genres, motivated implementing this sound with modern digital signal processing techniques. Spring reverberation produces chirplike responses. Rather than attempt to reproduce the physical vibrations of springs, this research uses a parametric model to duplicate their sound. The basic model consists of a spectral delay filter placed into a feedback loop with a long delay line and a selectable loop gain. A delay line is modulated with a strongly correlated random-number sequence. Parameters such as delay time, chirp shape, and decay rate can be adjusted.

  Download: PDF (HIGH Res) (17.3MB)

  Download: PDF (LOW Res) (1.9MB)

  Discuss this paper (1 comment)

Reverse Engineering of a Mix


In order to remaster an old recording made before modern digital processing, reverse engineering the original mix would allow for improving on the final mix. Two algorithms based on least-squares optimization allow the parameters of time-invariant processes, such as gains, delays, panning and filtering, to be estimated if a raw multitrack recording and the final targeted mix are both available. Theoretical and experimental results show that under specific assumptions the proposed method can precisely and efficiently retrieve the original mixing parameters.

  Download: PDF (HIGH Res) (5.8MB)

  Download: PDF (LOW Res) (1.4MB)

  Be the first to discuss this paper

Engineering Reports

Closed-Box Loudspeaker with a Series Capacitor


Adding a series capacitor to a closed-box loudspeaker modestly extends the low-frequency response, enabling the use of a smaller enclosure. In addition, the capacitor offers substantial protection against excessive voice-coil excursions from subsonic input signals. The capacitor converts a second-order system to third order. A design procedure for the composite system in closed form is provided, allowing the resulting transfer function to be optimized for group delay, frequency response, and cone excursion.

  Download: PDF (HIGH Res) (1.8MB)

  Download: PDF (LOW Res) (860KB)

  Discuss this report (6 comments)

Acoustical Design of a Bluetooth Earphone Using Simulated Annealing Optimization


Because a designer of a Bluetooth earphone is faced with conflicting requirements arising from sensitivity, distortion, bandwidth, and miniaturization, a systematic way of meeting these requirements would be useful. Based on a lumped-parameter model, the design process uses a simulated annealing algorithm, which is essential to a random-search technique. For the microspeaker and associated enclosure, a lumped-parameter model predicts the frequency response. Experimental results of the approach are presented, illustrating that the 3GPP2 standards can be met.

  Download: PDF (HIGH Res) (1.7MB)

  Download: PDF (LOW Res) (826KB)

  Be the first to discuss this report

Standards and Information Documents

AES Standards Committee News

Page: 591

Download: PDF (947KB)


128th Convention Report, London

Page: 594

Download: PDF (18.9MB)

128th Convention Exhibitors

Page: 611

Download: PDF (691KB)

40th Conference Preview, Tokyo

Page: 612

Download: PDF (7.0MB)

40th Conference Program

Page: 614

Download: PDF (588KB)

129th Convention Preview, San Francisco

Page: 626

Download: PDF (2.0MB)

129th Convention Exhibit Previews

Page: 629

Download: PDF (2.9MB)

Time-Frequency Processing of Spatial Audio


Time–frequency processing of spatial audio signals is an important area of current research. It enables elements of composite sounds to be isolated and managed selectively, and it is used in format conversion processes such as upmixing and downmixing. Time–frequency processing is also an important element of some low bit-rate coding schemes, and it is shown how stereo microphone signals can be processed directly for MPEG-Surround applications.

  Download: PDF (1.9MB)

  Be the first to discuss this feature

Education News

Author: Alex Case

Page: 661

Download: PDF (1.2MB)

41st Conference, London, Call for Papers

Page: 680

Download: PDF (402KB)


News of the Sections

Page: 664

Download: PDF (1.2MB)

Sound Track

Page: 668

Download: PDF (757KB)

Upcoming Meetings

Page: 669

Download: PDF (605KB)

Advertiser Internet Directory

Page: 669

Download: PDF (605KB)

Membership Information

Page: 671

Download: PDF (1.3MB)

In Memoriam

Page: 677

Download: PDF (853KB)

128th Convention Papers Order Form

Page: 681

Download: PDF (437KB)

Sections Contacts Directory

Page: 688

Download: PDF (460KB)

AES Conventions and Conferences

Page: 696

Download: PDF (521KB)


Table of Contents

Download: PDF (405KB)

Cover & Sustaining Members List

Download: PDF (411KB)

AES Officers, Committees, Offices & Journal Staff

Download: PDF (440KB)

AES - Audio Engineering Society