Title :
A single board multirate APC speech coding terminal
Author :
Field, K. ; Derr, A. ; Cosell, L. ; Henry, C. ; Krasner, M. ; Tiao, J.
Author_Institution :
BBN Laboratories, Inc., Cambridge, MA
Abstract :
A single-board 16 kb/s and 32 kb/s APC speech coding terminal is described. The board is configurable as either two receivers, two transmitters, or a single-channel full-duplex coder. The terminal consists of two identical, independent TI TMS32020- based modules. Included in each module is a TMS32020, an analog I/O section, A/D/A conversion, digital I/O circuitry, static RAMs, and EPROMs. The board size is 5.6" × 6.0", and can be packaged in a standard secretarial desk phone shell. A software architecture using this hardware to implement the 16/32 kb/s Adaptive Predictive Coding with Hybrid Quantization (APCHQ) algorithm is described.
Keywords :
Circuits; EPROM; Hardware; Packaging; Predictive coding; Quantization; Software algorithms; Software architecture; Speech coding; Transmitters;
Conference_Titel :
Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '87.
DOI :
10.1109/ICASSP.1987.1169767
