Download Entire Journal (2.9MB)
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| Volume 51 Number 11 | 2003 November |
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CONTENT Download Entire Journal (2.9MB) |
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| 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. | |
| Comment on this paper | |
| 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. | |
| Comment on this report | |
| 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. | |
| Comment on this report | |
| 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. | |
| Comment on this report | |
| 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) | |