| PAPERS | |
| Perceptual Enhancement of Wavefield Synthesis by Stereophonic Means (PDF-2.5MB) (HI-RES PDF-58.5MB) | |
| Helmut Wittek, Francis Rumsey, and G��nther Theile | 723 |
| Systems designed to accurately reconstruct soundfields in real spaces contain compromises that often result in error in perceived localization and sound color timbre. Wavefield synthesis is such an example. A new technique, called optimized phantom source imaging (OPSI), is designed to avoid spatial aliasing and the corresponding coloration of virtual sources. By combining low-frequency wavefield synthesis with conventional stereo, the proposed system improves the perceived sound color. This somewhat surprising result led to the hypothesis that a decoloration process exists in the model for stereo reproduction. | |
| A Perceptual Approach for Interaural Transfer Function Calculations Based on Wiener Filtering (PDF-816KB) (HI-RES PDF-17.0MB) | |
| Kwuen-Yieng Ou and Mingsian R. Bai | 752 |
| In order to reduce the quantity of data needed to represent head-related impulse responses by as much as 40%, a perceptual approach uses the ipsilateral response as the basis for the contralateral response. Errors at high frequencies are masked, and non-audible components are eliminated. Objective analysis and a subjective listening test validated the proposed technique for three-dimensional sound generation. No significant errors were found in either azimuth or elevation. | |
| ENGINEERING REPORTS | |
| Evaluation of Weighted Principal-Component Analysis Matching for Wavetable Synthesis (PDF-951KB) (HI-RES PDF-10.6MB) | |
| Simon Wun and Andrew Horner | 762 |
| Synthesizing musical instrument tones using wavetables is limited by the quality of the tables. Principal- component analysis (PCA), which uses spectral correlation to automatically create such tables, is efficient but usually does not adequately model sound in low-amplitude frames and with weak harmonics. By normalizing the signal before analysis, the weighted PCA method reduces spectral errors. Although PCA gives an analytic solution, none of the methods that were evaluated were optimum in all cases. | |
| Audibility of a CD-Standard A/D/A Loop Inserted into High-Resolution Audio Playback (PDF-615KB) (HI-RES PDF-9.4MB) | |
| E. Brad Meyer and David R. Moran | 775 |
| Conventional wisdom asserts that the wider bandwidth and dynamic range of SACD and DVD-A make them of audibly higher quality than the CD format. A carefully controlled double-blind test with many experienced listeners showed no ability to hear any differences between formats. High-resolution audio discs were still judged to be of superior quality because sound engineers have more freedom to make them that way. There is no evidence that perceived quality has anything to do with additional resolution or bandwidth. | |
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| STANDARDS AND INFORMATION DOCUMENTS | |
| AES Standards Committee News (PDF-891KB) | 780 |
| Standards participation; audio applications using IEEE 1394; transfer technologies; microphone measurement and characterization; grounding and EMC practices | |
| FEATURES | |
| Auditory Displays (PDF-3.2MB) | 784 |
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| EXTRAS | |
| Cover & Sustaining Members List (PDF-58KB) | |
| AES Officers, Committees, Offices & Journal Staff (PDF-75KB) | |
