.mu.-Law/A-law PCM CODEC

Details .mu.-Law/A-law PCM CODEC .mu.-Law/A-law PCM CODEC

1981-04-09

1983-09-13

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347C, 340347DA, 340347M, H03K 1302, H03K 1308

Patent

active

044045441

ABSTRACT:
In a PCM CODEC, a binary-weighted charge redistribution capacitor array is designed to be configured for either .mu.-law or A-law coding. Selection of one or the other coding configuration is achieved by controlling a single gate circuit. A unique cascaded switch arrangement ensures that when selected capacitors representative of a specified coding segment are connected to a reference voltage source, the next successive capacitor of the array is automatically connected to a variable source that provides a voltage representative of a step within the specified segment.

REFERENCES:
patent: 3594782 (1971-07-01), Carbrey
patent: 3626408 (1971-12-01), Carbrey
patent: 3651518 (1972-03-01), Carbrey
patent: 3653030 (1972-03-01), Carbrey
patent: 3653035 (1972-03-01), Carbrey
patent: 3745555 (1973-07-01), Carbrey
patent: 4231022 (1980-10-01), Kosugi et al.
Members of the Technical Staff, Bell Telephone Labs, Transmission Systems for Communication, 1971, pp. 574-583.
Tsividis et al., A Segmented U-255 Law PCM Voice Encoder--, IEEE Journal of Solid-State Circuits, vol. SC-11, No. 6, pp. 740-747.
Dwarakanath et al., A Two-Chip CMOS CODEC, International Conference on Communications, 1980 Conference Record, pp. 11.3.1-11.3.4.

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