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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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Journal of the AES


2005 April - Volume 53 Number 4

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Papers

PAPERS
System Measurement and Identification Using Pseudorandom Filtered Noise and Music Sequences (PDF-1.1MB)  
M. O. J. Hawksford    275
Either music sequences or pseudorandom filtered noise can be used to evaluate simultaneously the transfer function and distortion mechanisms in audio systems. This approach is applicable to amplifiers, signal processors, digital-to-analog converters, loudspeakers, and perceptual coders. In addition, the technique allows nonlinear modeling using a simplified Volterra model. Because the technique is a single-pass analysis, the effect of time-varying changes is minimized.  
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Synthesis of Room Responses Using Virtual Source Representation with Application in Reverberator Design (PDF-443KB)  
Mingsian R. Bai and Kwuen-Yieng Ou    297
Conventional methods for synthesizing reverberation and a spatial impression consider the space separately from the sound source. In the proposed method the sound field is represented by a mesh of virtual sources at the boundary surface, rather than by a simple image method or ray-tracing procedure. Physical settings of the space are naturally incorporated into the model. Numerical simulations were performed for a rectangular room and a concert hall, and subjective listening tests confirmed that the technique is capable of rendering remarkable realism. Only the early part of the reverberation process is represented in this approach.  
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Direct-Radiator Loudspeaker Efficiency at Fundamental Resonance (PDF-398KB)  
Carlo Zuccatti    307
For direct-radiator loudspeakers, the efficiency at resonance is often higher than the rated efficiency at midfrequencies, which are assumed to be the more useful frequency range. Band-limited systems, such as subwoofer enclosures using loudspeakers operating near their resonant frequency, can take advantage of this effect, especially with low DC resistance voice coils.  
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ENGINEERING REPORTS
A Comparison between Local Search and Genetic Algorithm Methods for Wavetable Matching (PDF-535KB)  
Simon Wun and Andrew Horner    314
The effectiveness and efficiency of wavetable synthesis of musical notes require a strategy for selecting the basis spectra from which the notes can be synthesized. This work describes a local search method for basis spectra that improves the performance with simple selection criteria. Five methods converged to within an error range of about 1%, though occasionally the algorithm gets stuck on defective local optimum.  
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STANDARDS AND INFORMATION DOCUMENTS
AES Standards Committee News (PDF-85KB)    326
MADI guidelines; recorded fluxivity; magnetic tape handling; microphone measurements and digital interface  
 
FEATURES
Multichannel Audio Systems and Techniques (PDF-649KB)    329
Shake, Rattle, and Roll; Getting Immersed in Multisensory, Interactive Music via Broadband Networks  
Wieslaw Woszczyk, Jeremy Cooperstock, John Roston, and William Martens (PDF-549KB)    336
 
DEPARTMENTS
Upcoming Meetings (PDF-518KB)    344
News of the Sections (PDF-217KB)    345
Sound Track (PDF-148KB)    348
New Products and Developments (PDF-177KB)    350
Available Literature (PDF-90KB)    352
Membership Information (PDF-265KB)    355
In Memoriam (PDF-266KB)    360
Sections Contacts Directory (PDF-136KB)    361
AES Conventions and Conferences (PDF-191KB)    368
 
EXTRAS
Cover & Sustaining Members List (PDF-119KB)    
AES Officers, Committees, Offices & Journal Staff (PDF-141KB)    
 
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