| PAPERS | |
| Effects of Bandwidth Limitation on Audio Quality in Consumer Multichannel Audiovisual Delivery Systems (PDF-246K) | |
| Slawomir K. Zielinski, Francis Rumsey, and Søren Bech | 475 |
| When transmitting or storing 5.1 program material, if bandwidth must be sacrificed to accommodate channel limitations, the rear surround and the front center channels are the best choices. As long as the front left and right channels maintain the full spectrum, subjective degradation is minimal. Extensive subjective tests support this conclusion even if the bandwidth-limited channels contain foreground audio content. | |
| An Efficient Algorithm for the Restoration of Audio Signals Corrupted with Low-Frequency Pulses (PDF-756K) | |
| Paulo A. A. Esquef, Luiz W. P. Biscainho, and Vesa Välimäki | 502 |
| Restoring old recordings, especially those that contain clicks at the boundaries where pieces of a broken record have been glued together, requires a model of the corruption. In addition to the transient itself, the cartridge responds to the transient with a long-tailed, low-frequency impulse response, which must also be removed. The authors propose a computationally efficient algorithm, called two-pass split-window filtering, to model and remove this additional component. The results are compared with an autoregressive algorithm. | |
| ENGINEERING REPORTS | |
| Study on the Relationship between Some Room Acoustical Descriptors (PDF-610K) | |
| D. Ouis | 518 |
| An acoustic model of a performance space provides a means for evaluating those physical measures that predict the subjective experience, such as spaciousness. In order to evaluate the relationship between the various metrics over the space, the author simulated a rectangular space with an additional pair of sidewall balconies. Image reflections and diffraction effects were included to make the model more representative of a real space. This allowed the relationship among parameters to be evaluated. | |
| Automated Parameter Optimization for Double Frequency Modulation Synthesis Using a Tree Evolution Algorithm (PDF-132K) | |
| B. T. G. Tan and N. Liu | 534 |
| As a means of synthesizing complex sounds, several frequency modulation techniques have become popular. However, finding the ideal frequency and amplitude modulation waveforms to create a target signal is difficult, ad hoc, and prone to nonoptimum results. Many optimization algorithms tend to converge to a local solution without adequately exploring the entire space for better solutions. The proposed approach separately explores each local solution rather than focusing on a single part of the space. | |
| STANDARDS AND INFORMATION DOCUMENTS | |
| AES Standards Committee News (PDF-1.0MB) | 547 |
| Level meters; digital interfacing; digital synchronization; forensic audio; microphone measurements; audio applications of IEEE 1394 | |
| FEATURES | |
| History of Spatial Coding Mark F. Davis (PDF-1.3MB) | 554 |
| Automotive Audio (PDF-454K) | 570 |
| New Media for Music: An Adaptive Response to Technology (PDF-138K) | 575 |
| Updates and Corrections to the 2002/2003 International Sections Directory (PDF-192K) | 578 |
| Education News (PDF-258K) | 580 |
| 116th Convention, Berlin, Call for Papers (PDF-35K) | 596 |
| DEPARTMENTS | |
| News of the Sections (PDF-249K) | 582 |
| Upcoming Meetings (PDF-10K) | 587 |
| Sound Track (PDF-10K) | 588 |
| New Products and Developments (PDF-89K) | 589 |
| Available Literature (PDF-9K) | 591 |
| Membership Information (PDF-42K) | 592 |
| Advertiser Internet Directory (PDF-37K) | 593 |
| In Memoriam (PDF-101K) | 594 |
| AES Special Publications (PDF-84K) | 597 |
| Sections Contacts Directory (PDF-33K) | 602 |
| AES Conventions and Conferences (PDF-42K) | 608 |
| EXTRAS | |
| Cover & Sustaining Members List (PDF-25K) | |
| VIP List & Editorial Staff (PDF-26K) | |
| Ads In This Issue (HTML) | |
