Integrated digital circuit for processing speech signal

Details Integrated digital circuit for processing speech signal Integrated digital circuit for processing speech signal

1987-05-18

1988-06-28

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

370 62, H03M 738

Patent

active

047542586

ABSTRACT:
In an integrated circuit for transcoder, a substractor generates a signal representing a difference between an input speech signal and a prediction signal. This signal is transferred to a quantizing unit. The unit quantizes an output signal from the subtractor, and generates a predictive encoded signal. An inverse quantizing unit generates a difference signal. A predictor filter generates the prediction signal to be supplied to the subtractor. A signal path changing unit made up of electronic switches respondes to a mode select signal to suitably change an electric connection among the subtractor, the quantizing unit and the reverse quantizing unit, whereby the integrated circuit device can function as and ADPCM encoder or an ADPCM decoder.

REFERENCES:
patent: 3743790 (1973-07-01), Hilsley
patent: 4190742 (1980-02-01), Southard

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