AES Journal

Journal of the AES

2004 November - Volume 52 Number 11


President's Message (PDF-89K)                            Theresa Leonard    1123
Dithered Noise Shapers and Recursive Digital Filters (PDF-642K)  
Stanley P. Lipshitz, Robert A. Wannamaker, and John Vanderkooy    1124
Quantizers combining the use of colored, nonsubtractive dither with or without noise-shaping error feedback are closely examined for the first time. In particular, it is shown that the appropriate use of spectrally shaped dither signals entails subtle practical and theoretical considerations, especially if such dithers are combined with noise-shaping schemes. A rigorous analysis of systems employing such dither signals with and without feedback is undertaken, yielding practical guidelines that ensure satisfactory results in applications. In particular, it is shown that the class of dither signals suitable for combination with noise shaping is greatly restricted.  

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Motion-Tracked Binaural Sound (PDF-596K)  
V. Ralph Algazi, Richard O. Duda, and Dennis M. Thompson    1142
By using a head tracking system that selects from an array of microphones placed on a surface that approximates the listener's head, the authors have created an alternative to the conventional binaural recording technique. Based on the orientation of the listener, the appropriate microphone is selected or the signals from a pair of microphone signals are interpolated. Head tracking provides strong dynamic cues that create a strong sense of realism with a reduced need for pinna matching. This approach supports multiple listeners from a single microphone array.  

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Importance and Representation of Phase in the Sinusoidal Model (PDF-407K)  
Tue Haste Andersen and Kristoffer Jensen    1157
While the importance of differential phase among the components of an audio signal has been debated over the years, experiments show that both synthesized and encoded audio need to consider phase integrity. Subjective listening tests with sounds that were synthesized with varying amounts of phase information clearly demonstrate the need to use a reliable phase model, especially with common harmonic musical sounds. A novel phase representation, called partial-period phase, characterizes phase evolution as an almost stationary parameter.  

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Direct Approximate Third-Order Response Synthesis of Vented-Box Loudspeaker Systems (PDF-218K)  
Bernat Llamazares    1170
Extending the earlier work on vented-box loudspeaker systems, a new approach is proposed that provides approximate third-order frequency-response alignments characterized by featuring a good transient response at reduced efficiency for the lower frequencies. These new alignments are very suitable for low-resonance, low-Q drivers, producing a response characteristic midway between a second-order sealed-box and a fourth-order vented-box loudspeaker system. This approach provides an additional degree of freedom in the design.  

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Correction to "Analysis of Loudspeaker Line Arrays" (PDF-88K)    1176
Mark S. Ureda  
AES Standards Committee News (PDF-85K)    1177
Synchronization; optical disks; media storage; file interchange; jitter  
Metadata Revisited: Six New Things to Know About Audio Metadata (PDF-439K)    1178
Digital Archive Strategies and Solutions for Radio Broadcasting (PDF-728K)    1180
New Officers 2004/2005 (PDF-153K)    1185
26th Conference, Denver, Call for Papers (PDF-85K)    1200
News of the Sections (PDF-323K)    1188
Upcoming Meetings (PDF-105K)    1192
Sound Track (PDF-105K)    1192
New Products and Developments (PDF-100K)    1193
Available Literature (PDF-117K)    1194
Membership Information (PDF-136K)    1195
Advertiser Internet Directory (PDF-115K)    1197
Sections Contacts Directory (PDF-120K)    1201
AES Conventions and Conferences (PDF-116K)    1208
Cover & Sustaining Members List (PDF-273K)    
VIP List & Editorial Staff (PDF-104K)    
AES - Audio Engineering Society