A single board multirate APC speech coding terminal

descriptionPublicationkeyboard_double_arrow_right Article 24 Mar 2005Publisher:Institute of Electrical and Electronics Engineers (IEEE)Journal:ICASSP '87. IEEE International Conference on Acoustics, Speech, and Signal Processing, volume 12, pages 960-963

Authors: L. Cosell; C. Henry; M. Krasner; A. Derr; J. Tiao; K. Field;

doi: 10.1109/icassp.1987.1169767

A single board multirate APC speech coding terminal

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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.

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