| President's Message (PDF-89K) Theresa Leonard | 1123 |
| PAPERS | |
| Dithered Noise Shapers and Recursive Digital Filters (PDF-642K) | |
| Stanley P. Lipshitz, Robert A. Wannamaker, and John Vanderkooy | 1124 |
| Quantizers combining the use of colored, nonsubtractive dither with or without noise-shaping error feedback are closely examined for the first time. In particular, it is shown that the appropriate use of spectrally shaped dither signals entails subtle practical and theoretical considerations, especially if such dithers are combined with noise-shaping schemes. A rigorous analysis of systems employing such dither signals with and without feedback is undertaken, yielding practical guidelines that ensure satisfactory results in applications. In particular, it is shown that the class of dither signals suitable for combination with noise shaping is greatly restricted. | |
| Motion-Tracked Binaural Sound (PDF-596K) | |
| V. Ralph Algazi, Richard O. Duda, and Dennis M. Thompson | 1142 |
| By using a head tracking system that selects from an array of microphones placed on a surface that approximates the listener's head, the authors have created an alternative to the conventional binaural recording technique. Based on the orientation of the listener, the appropriate microphone is selected or the signals from a pair of microphone signals are interpolated. Head tracking provides strong dynamic cues that create a strong sense of realism with a reduced need for pinna matching. This approach supports multiple listeners from a single microphone array. | |
| Importance and Representation of Phase in the Sinusoidal Model (PDF-407K) | |
| Tue Haste Andersen and Kristoffer Jensen | 1157 |
| While the importance of differential phase among the components of an audio signal has been debated over the years, experiments show that both synthesized and encoded audio need to consider phase integrity. Subjective listening tests with sounds that were synthesized with varying amounts of phase information clearly demonstrate the need to use a reliable phase model, especially with common harmonic musical sounds. A novel phase representation, called partial-period phase, characterizes phase evolution as an almost stationary parameter. | |
| ENGINEERING REPORTS | |
| Direct Approximate Third-Order Response Synthesis of Vented-Box Loudspeaker Systems (PDF-218K) | |
| Bernat Llamazares | 1170 |
| Extending the earlier work on vented-box loudspeaker systems, a new approach is proposed that provides approximate third-order frequency-response alignments characterized by featuring a good transient response at reduced efficiency for the lower frequencies. These new alignments are very suitable for low-resonance, low-Q drivers, producing a response characteristic midway between a second-order sealed-box and a fourth-order vented-box loudspeaker system. This approach provides an additional degree of freedom in the design. | |
| CORRECTIONS | |
| Correction to "Analysis of Loudspeaker Line Arrays" (PDF-88K) | 1176 |
| Mark S. Ureda | |
| STANDARDS AND INFORMATION DOCUMENTS | |
| AES Standards Committee News (PDF-85K) | 1177 |
| Synchronization; optical disks; media storage; file interchange; jitter | |
| FEATURES | |
| Metadata Revisited: Six New Things to Know About Audio Metadata (PDF-439K) | 1178 |
| Digital Archive Strategies and Solutions for Radio Broadcasting (PDF-728K) | 1180 |
| New Officers 2004/2005 (PDF-153K) | 1185 |
| 26th Conference, Denver, Call for Papers (PDF-85K) | 1200 |
| DEPARTMENTS | |
| News of the Sections (PDF-323K) | 1188 |
| Upcoming Meetings (PDF-105K) | 1192 |
| Sound Track (PDF-105K) | 1192 |
| New Products and Developments (PDF-100K) | 1193 |
| Available Literature (PDF-117K) | 1194 |
| Membership Information (PDF-136K) | 1195 |
| Advertiser Internet Directory (PDF-115K) | 1197 |
| Sections Contacts Directory (PDF-120K) | 1201 |
| AES Conventions and Conferences (PDF-116K) | 1208 |
| EXTRAS | |
| Cover & Sustaining Members List (PDF-273K) | |
| VIP List & Editorial Staff (PDF-104K) | |
