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Audibility of a CD-Standard A/DA/A Loop Inserted into High-Resolution Audio Playback - September 2007
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Reflecting on Reflections - June 2014
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Quiet Thoughts on a Deafening Problem - May 2014
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Journal of the AES


2008 October - Volume 56 Number 10

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Papers

President’s Message (PDF-102KB)                            Jim Anderson    771
 
PAPERS
Low-Frequency Loudspeaker–Room Simulation Using Finite Differences in the Time Domain—Part 1: Analysis (PDF-1.2MB) (HI-RES PDF-16.4MB)  
Adrian Celestinos and Sofus Birkedal Nielsen    772
A computer simulation using finite-difference time-domain techniques has been used to model the low-frequency transfer function between a loudspeaker and virtual microphones in a rectangular room. The model for the analysis was validated with measurements in an IEC standard listening space. Using the mean sound field deviation, the cumulative spectral energy decay, and the clarity metric, the properties of a sample room can be examined mathematically and visually. At frequencies between 30 and 100 Hz, sound pressure varies as much as 30 dB from one position to another.  
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Adaptive RD Optimized Hybrid Sound Coding (PDF-1.2MB) (HI-RES PDF-7.8MB)  
Nicolle H. van Schijndel, Julien Bensa, Mads G. Christensen, Catherine Colomes, Bernd Edler, Richard Heusdens, Jesper Jensen, Søren Holdt Jensen, W. Bastiaan Kleijn, Valery Kot, Balázs Kövesi, Jonas Lindblom, Dominique Massaloux, Omar A. Niamut, Fredrik Nordén, Jan H. Plasberg, Renat Vafin, Steven van de Par, David Virette, and Oliver Wübbolt    787
Rather than select a single type of codec optimized for a particular application, the authors propose a generic sound-coding technology that combines a range of different coding algorithms based on the current properties of the audio and the channel constraints. Rate-distortion optimization is a promising method for such a framework. Subjective listening tests show the advantages of this kind of flexibility in such applications as Internet radio, portable storage, and mobile communications. Bit allocation is not fixed but flexible, which allows for adaptation to time-varying inputs and changing channel properties.  
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Modifying the Directional Responses of a Coincident Pair of Microphones by Postprocessing (PDF-470KB) (HI-RES PDF-5.8MB)  
Christof Faller    810
By means of time–frequency signal processing, the effective directional response of stereo coincident microphones can be altered. This allows the spaciousness of the recording to be controlled without the use of artificial reverberation and with good localization. Effectively, the algorithm reduces the overlapping region of the microphone responses. Subjective testing shows that audio quality is very high and cardioid coincident stereo recordings are improved. Rear sound is rejected and the two signals remain in phase.  
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Corpuscular Streaming and Parametric Modification Paradigm for Spatial Audio Teleconferencing (PDF-1.1MB) (HI-RES PDF-11.5MB)  
B. St. James and M. O. J. Hawksford    823
This paper presents a new paradigm for spatial audio teleconferencing that exploits the corpuscular nature of general audio parametric coding for low bit-rate audio compression. The paradigm consists of several processing tools. The spatial aspect is enacted by a dynamic rendition tool that optimizes placement of speech sources within the soundscape; the temporal aspects of a phoneme protection tool misalign corruptive and vulnerable speech elements in a multitalking environment. A novel means of echo suppression eliminates the need for adaptive filtering and real-time echo cancellation, which is difficult for multichannel audio.  
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CORRECTIONS
Correction to “Binaural Loudness for Artificial-Head Measurements in Directional Sound Fields”  
V. P. Sivonen and W. Ellermeier (PDF-36KB)    844
 
STANDARDS AND INFORMATION DOCUMENTS
AES Standards Committee News (PDF-75KB)    845
AESSC progress report; audio networks; cable shields; loudspeaker polar radiation; digital interface for loudspeakers; audio metadata  
 
FEATURES
34th Conference Report, Jeju Island (PDF-4.0MB)    850
Let the Games Be Mobile (PDF-480KB)    Francis Rumsey    862
New Officers 2008/2009 (PDF-164KB)    866
Review of Society’s Sustaining Members (PDF-683KB)    870
126th Convention, Munich, Call for Papers (PDF-112KB)    896
37th Conference, Denmark, Call for Papers (PDF-88KB)    897
Call for Nominations for the Board of Governors (PDF-41KB)    898
Call for Awards Nominations (PDF-55KB)    899
Bylaws: Audio Engineering Society, Inc. (PDF-89KB)    900
 
DEPARTMENTS
Reviews of Acoustical Patents (PDF-346KB)    847
Upcoming Meetings (PDF-64KB)    869
News of the Sections (PDF-221KB)    886
Sound Track (PDF-64KB)    890
New Products and Developments (PDF-70KB)    891
Membership Information (PDF-208KB)    892
Advertiser Internet Directory (PDF-166KB)    893
In Memoriam (PDF-108KB)    895
Sections Contacts Directory (PDF-178KB)    904
AES Conventions and Conferences (PDF-114KB)    912
 
EXTRAS
Cover & Sustaining Members List (PDF-101KB)    
AES Officers, Committees, Offices & Journal Staff (PDF-77KB)    
Advertisements (PDF-4.5MB)    
 
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