|1997 OCTOBER, VOLUME 45 NUMBER 10|
President's Message Subir K. Pramanik p.763
Effect Design: Part 2 Delay-Line Modulation and Chorus
Jon Dattorro p.764
The author has written a comprehensive three-part toolbox paper, which is intended to serve as a tutorial point of reference for digital audio effects that are frequently used by the electronic music industry. In this second presentation, linear interpolation, all-pass interpolation, and white chorus effects including flanger algortihms are discussed. Historical background, pertinent references, and appendices are included on each of these subjects to further aid the reader's understanding.
ISO/IEC MPEG-2 Advanced Audio Coding
Marina Bosi, Karlheinz Brandenburg, Schuyler Quackenbush, Louis Fielder, Kenzo Akagiri, Henrik Fuchs, Martin Dietz, Juergen Herre, Grant Davidson, and Yoshiaki Oikawa p.789
The main features of the MPEG-2 advanced audio coding (AAC) system (ISO/IEC 13818-7) are described in this paper. The AAC system was designed to provide MPEG-2 with the best audio quality without compatibility-based restrictions. MPEG-2 AAC combines the coding efficiency of a high- resolution filter bank, prediction techniques, and Huffman coding with additional functionalities aimed at delivering very high audio quality at a variety of data rates. According to the current plans of ISO/IEC MPEG, the AAC system will be the last very high quality audio standard for the foreseeable future.
Learning Algorithms for Audio Signal Enhancement: Part 1 Neural Network Implementation for the Removal of Impulse Distortions
Andrzej Czyzewski p.815
Unique learning algorithms were used to analyze impulse distorted audio signal fragments. The purpose of these algorithms was to aid in eliminating impulse distortions in old records and transmitted audio signals. The results of these studies indicate that neural networks are an appropriate tool for detection and removal of impulsive disturbances when using nonlinear predictive interpolation of missing signal intervals.
TDFD-Based Measurement of Analog-to-Digital Converter Nonlinearity
James Rathmell, Jonathan Scott, and Anthony Parker p.832
Analog-to-digital converter nonlinearity is measured using the standard audio total difference frequency distortion (TDFD) method. In this system two signal frequencies are applied to the device under test and the resulting intermodulation products are then identified. The TDFD measurement method has the advantage of being relatively insensitive to the harmonic content of the input test signals; it is easier to produce a valid intermodulation test signal than it is to produce a test signal of low harmonic content to measure harmonic distortion.
STANDARDS AND INFORMATION DOCUMENTS
AES Standards Committee News p.841
DVD audio; Internet audio
DRAFT REVISED AES24-1-xxxx DRAFT REVISED AES standard for sound system control - Application protocol for controlling and monitoring audio devices via digital data networks - Part 1: Principles, formats, and basic procedures (insert)
New AES Officers 1997/1998 p.844
Review of Society's Sustaining Members p.851
Updates and Corrections to the 1996/1997 AES International Sections Directory p.883
News of the Sections p.873
Sound Track p.877
New Products and Developments p.879
Upcoming Meetings p.881
Available Literature p.881
Membership Information p.885
Sections Contacts Directory p.892
AES Conventions and Conferences p.896