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Journal of the AES


2003 November - Volume 51 Number 11

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Papers

President's Message (PDF-23K)       Ron Streicher    1011
 
PAPERS
The Effect of Nonlinear Distortion on Perceived Quality of Music and Speech Signals (PDF-239K)  
Chin-Tuan Tan, Brian C. J. Moore, and Nick Zacharov    1012
The subjective evaluation of nonlinear distortions often shows a weak correlation with physical measures because the choice of distortion metrics is not obvious. In reexamining this subject, the authors validated a metric based on the change in the spectrum in a series of spectral bins, which when combined leads to a single distortion metric. Distortion was evaluated both objectively and subjectively using speech and music. Robust results support the hypothesis for this approach.  
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ENGINEERING REPORTS
Ultra-High Quality Video Frame Synchronous Audio Coding (PDF-343K)  
Michael J. Smithers, Brett G. Crockett, and Louis D. Fielder    1032
When audio signals accompany video information, additional requirements are imposed on audio encoding to allow for frame-based video editing, switching, and splicing. Moreover within the bit budget, the number of channels and their bit allocation is flexible. In the proposed approach audio blocks are designed to match the frame boundaries, but with an additional transitional region that avoids time-domain aliases, a degradation resulting when neighboring blocks are no longer contiguous.  
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Large-Signal Analysis of Triode Vacuum-Tube Amplifiers (PDF-104K)  
Muhammad Taher Abuelma'atti    1046
With the renewed interest in vacuum tubes, the issue of intrinsic distortion mechanisms becomes relevant again. The author demonstrates a nonlinear model of triodes and pentodes that leads to a closed-form solution when the nonlinearity is represented by a Fourier expansion rather than the conventional Taylor series. When applied to a two-tone sine wave, the analysis shows that the distortion in tube amplifiers is similar to that of the equivalent transistor amplifier. A SPICE analysis confirms the approach.  
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Acoustical Measurements of Traditional Theaters Integrated with Chinese Gardens (PDF-490K)  
Weihwa Chiang, Yenkun Hsu, Jinjaw Tsai, Jiqing Wang, and Linping Xue    1054
The acoustics of three Chinese theaters from the nineteenth century were evaluated using the conventional metrics for performance spaces. Similar to the Western tradition, theaters evolved as one of three types: amphitheater, courtyard, and auditorium. However, Chinese theaters were often integrated with privately owned gardens with a diversified design and acoustic architecture. Even with a high degree of spatial irregularity, measurements were consistent with modern theater acoustics.  
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LETTERS TO THE EDITOR
Comments on "History of Spatial Coding" (PDF-16K)  
Peter Scheiber    1062
 
Why Is Bass Reproduction from a Dipole Woofer in a Living Room Often Subjectively More Accurate Than from a Monopole Woofer? (PDF-16K)  
Siegfried Linkwitz    1062
 
STANDARDS AND INFORMATION DOCUMENTS
AES Standards Committee News (PDF-53K)    1064
Standards in print  
 
FEATURES
Binaural Audio in the Era of Virtual Reality (PDF-609K)    1066
New Officers 2003/2004 (PDF-313K)    1073
2003/2004 AES International Sections Directory (PDF-346K)    1078
 
DEPARTMENTS
News of the Sections (PDF-113K)    1104
Sound Track (PDF-42K)    1108
New Products and Developments (PDF-42K)    1108
Upcoming Meetings (PDF-48K)    1109
Available Literature (PDF-12K)    1110
Membership Information (PDF-98K)    1111
Advertiser Internet Directory (PDF-21K)    1112
AES Special Publications (PDF-80K)    1115
AES Conventions and Conferences (PDF-44K)    1120
 
EXTRAS
Cover & Sustaining Members List (PDF-33K)    
VIP List & Editorial Staff (PDF-41K)    
Ads In This Issue (HTML)    
 
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