| PAPERS | |
| Blind Cancellation of Stereo-Base Widening (PDF-844KB) (HI-RES PDF-8.9MB) | |
| Erik van de Ven, Ronald M. Aarts, and Piet C. W. Sommen | 227 |
| Depending on the application, signal processing in audio reproduction equipment is often used to widen the perceived image, especially when the listener is relatively far from the sound source or when the stereo loudspeakers are close together. However, if the stereo signal has already been widened, a second widening can produce severe spatial degradation and coloration. For this reason, an algorithm that determines if the signal has already been widened allows for a conditional widening only if the signal has not been so processed. A reliable model for widening based on the statistics of phase difference between the stereo pair is presented and validated. | |
| Examination of Multichannel Sound-Field Recomposition Utilizing Frequency-Dependent Interaural Cross Correlation (FIACC) (PDF-3.7MB) (HI-RES PDF-117.8MB) | |
| Teruo Muraoka and Tomoaki Nakazato | 236 |
| A frequency-dependent interaural cross correlation (FIACC) metric was used to evaluate the degree to which a variety of loudspeaker configurations could adequately reproduce the sound field of a large space. By comparing the metric of a real and reproduced space using a dummy head, an objective measure of each configuration could be established. The five-channel system configured according to the ITU recommendation BS.775-1 was shown to be optimum. | |
| Derivation of a Transfer Function for Imaging Polarimetry Used in Magneto-Optical Investigations of Audio Tapes in Authenticity Investigations (PDF-478KB) (HI-RES PDF-10.3MB) | |
| Jos Bouten, Mariska van Rijsbergen, and Simon Donkers | 257 |
| Ferrimagnetic garnet films, known as Faraday crystals, offer a nondestructive means for forensic authentication of tape recordings. But in order to replace the more familiar pictures using ferrofluids, which may alter the tape's magnetism, a theoretical explanation for the physics of this new technique must be established. What are the pictures actually showing? A theoretical model, including a practical transfer function, establishes the relationship between the magnetic distribution and the resulting visualization. | |
| DSP Techniques for Determining "Wow" Distortion (PDF-1.7MB) (HI-RES PDF-39.4MB) | |
| Andrzej Czyzewski, Andrej Ciarkowski, Andrzej Kaczmarek, Jozef Kotus, Maciej Kulesza, and Przemek Maziewski | 266 |
| Given the artistic value of archived analog recordings, there is strong desire to use modern signal processing techniques to remove wow degradations created by variations in speed. A new set of algorithms is proposed to model speed variations by tracking the frequency of incidental pilot tones, such as hum and bias frequency, and by using an adaptive analysis of the center of gravity of the spectrum of the distorted signal. A semiautomated adaptive approach, with a human operator making critical choices, improves performance. | |
| STANDARDS AND INFORMATION DOCUMENTS | |
| AES Standards Committee News (PDF-64KB) | 285 |
| Membership; digital audio interfaces, AES3 implementation guidelines; digital audio measurements, jitter performance | |
| FEATURES | |
| 31st Conference Preview, London (PDF-1.7MB) | 290 |
| Calendar (PDF-1.1MB) | 292 |
| Program (PDF-1.3MB) | 293 |
| Registration Form (PDF-74KB) | 300 |
| Audio for Mobile and Handheld Devices (PDF-473KB) | 301 |
| DEPARTMENTS | |
| Reviews of Acoustical Patents (PDF-630KB) | 287 |
| News of the Sections (PDF-397KB) | 305 |
| Sound Track (PDF-115KB) | 310 |
| New Products and Developments (PDF-58KB) | 313 |
| Available Literature (PDF-61KB) | 314 |
| Upcoming Meetings (PDF-50KB) | 315 |
| Membership Information (PDF-238KB) | 316 |
| Advertiser Internet Directory (PDF-214KB) | 317 |
| In Memoriam (PDF-58KB) | 319 |
| Sections Contacts Directory (PDF-111KB) | 320 |
| AES Conventions and Conferences (PDF-159KB) | 328 |
| EXTRAS | |
| Cover & Sustaining Members List (PDF-57KB) | |
| AES Officers, Committees, Offices & Journal Staff (PDF-116KB) | |
