Adaptive differential PCM decoder

Details Adaptive differential PCM decoder Adaptive differential PCM decoder

1983-05-11

1985-10-22

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 32, 375 30, 332 11D, 340347DA, H03K 1322, H03K 1301

Patent

active

045493057

ABSTRACT:
The present invention features an ADPCM decoder of the instantaneous companding type which comprises two memory circuits (each preferably PROM). The first memory contains a plurality of differential values and the second a plurality of step size control codes. The memories receives ADPCM input codes which function as address signals. The memories are connected through an adder and a shift register feedback connected with the adder. The first memory receives two inputs, one of which is an ADPCM input code and the other is an input consisting of the sum of the current output of the second memory plus the previous value outputted thereby. The first memory produces a differential value on the basis of the two inputs applied.

REFERENCES:
patent: 3609551 (1971-09-01), Brown
patent: 3835385 (1974-09-01), Hoeschele et al.
patent: 3925731 (1975-12-01), Brainard et al.
patent: 4039948 (1977-08-01), Boxall
patent: 4449190 (1984-05-01), Flanagan et al.

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