AES Journal

Journal of the AES

2006 June - Volume 54 Number 6


Loudspeakers and Rooms for Sound Reproduction-A Scientific Review (PDF-678KB) (HI-RES PDF-4.8MB)  
Floyd E. Toole    451
Much of our understanding of how listeners hear spatial acoustics originates from studies with large spaces, notably concert halls. While the resulting insights are frequently extended to small spaces, other phenomena weaken the validity of conclusions. Listeners may be adapting to the complexities of reflections and resonances in small spaces, thereby reducing or eliminating the perception of measured degradation. Informal evidence from the professional recording industry suggests that humans compensate and adapt to the acoustical anarchy of complex sound fields.  

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A Comparison of the "Pruned Tree" versus "Stack" Algorithms for Look-Ahead Sigma-Delta Modulators (PDF-1.1MB) (HI-RES PDF-18.9MB)  
J. A. S. Angus    477
High-order Sigma-Delta modulators, used in high-quality converters, cannot use aggressive noise-shaped filtering because the one sample delay in the feedback produces instability under overload conditions. Various solutions have been proposed, but computational burdens grow exponentially with increases in the look-ahead depth. Pruning the choices reduces the burden but at the risk of discarding the optimum choice. A comparison of the "pruned tree" and the "stack" algorithms shows that the former is most efficient even though the latter has better theoretical performance.  

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Evaluation of Sound Quality, Boominess, and Boxiness in Small Rooms (PDF-580KB) (HI-RES PDF-10.5MB)  
Adam Weisser and Jens Holger Rindel    495
Subjective listening tests were conducted in seven small rooms to investigate those physical attributes that correspond to the perception of boominess and boxiness. Three new acoustic metrics-small room bass ratio, small room early decay time ratio, and low-high ratio-proved to be better predictors of sound quality than conventional measures. However, the type of audio, namely music or speech, influenced preference and quality judgments. Speech was best in rooms with weak reverberation, whereas a preferred range of reverberation was found for music.  

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Effect of Reflectors on Sound-Source Localization with Two Microphones (PDF-659KB) (HI-RES PDF-13.6MB)  
Sandeep A. Phatak, Rama Ratnam, Bruce C. Wheeler, William D. O'Brien, Jr., and Albert Feng    512
The performance of algorithms that extract source location using a pair of microphones degrades in either reverberant conditions or the presence of parallel reflectors. Localization of signals such as white noise, which are very broadband, is more robust than with speech, which can be narrow band. Reverberation produces excessive temporal smearing at low frequencies. Finally, the localization-extraction algorithm, which is frequency-based, proved more reliable than the commonly used multiple signal classification algorithm.  

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29th Conference Preview, Seoul (PDF-950KB)    526
   Calendar (PDF-130KB)    528
   Program (PDF-211KB)    530
   Registration Form (PDF-97KB)    535
Enhanced Multichannel Audio (PDF-343KB) (HI-RES PDF-818KB)    536
Surround Sound: A Chance for Enhanced Creativity (PDF-142KB)    540
News of the Sections (PDF-283KB)    542
Sound Track (PDF-289KB)    546
New Products and Developments (PDF-94KB)    548
Available Literature (PDF-147KB)    549
Advertiser Internet Directory (PDF-147KB)    549
Upcoming Meetings (PDF-151KB)    550
Membership Information (PDF-200KB)    551
Sections Contacts Directory (PDF-242KB)    560
AES Conventions and Conferences (PDF-246KB)    568
Cover & Sustaining Members List (PDF-86KB)    
AES Officers, Committees, Offices & Journal Staff (PDF-171KB)    
Advertising Insert (PDF-1.8MB)    
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