Multi channel ADPCM compression and expansion device

Details Multi channel ADPCM compression and expansion device Multi channel ADPCM compression and expansion device

1994-07-20

1995-11-14

Chin, Stephen

Pulse or digital communications

Pulse code modulation

Differential

375241, 348384, H04B 1406

Patent

active

054673720

ABSTRACT:
A multichannel ADPCM compression and expansion device includes N sets of input and output interfaces; an ADPCM compression and expansion device which expansively converts data of K bits in a form of ADPCM signals into PCM signals of M bits in response to a first control signal and outputs the same and compressively converts data of M bits in a form of PCM signals into ADPCM data of K bits in response to a second control signal; and a control unit which divides one signal transmission slot interval into N sections and successively selects the N sets of input and output interfaces in a predetermined order during respective divided intervals divided into N sections and connects to the ADPCM compression and expansion device, and successively performs, while separating the divided interval into a former half and a latter half, a first control which generates the first control signal and sends the data of K bits to the ADPCM compression and expansion device and then returns the expansively converted M bit data to the selected input and output interface, and a second control which generates the second control signal and sends the M bit data to the ADPCM compression and expansion device and then returns the compressively converted K bit data to the selected input and output interface.

REFERENCES:
patent: 4039948 (1977-08-01), Boxall
patent: 4955054 (1990-09-01), Boyd, Jr. et al.
patent: 4970723 (1990-11-01), Lin
patent: 5289549 (1994-02-01), Raffey et al.

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