Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1986-02-27
1987-08-11
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
340347C, 375 27, H03M 737
Patent
active
046865128
ABSTRACT:
In an integrated circuit for transcoder, a subtractor 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 responds to a mode select signal to suitably change an electric connection among the subtractor, the quantizing unit and the reverse quantizing unit, whereby the integrataed circuit device can function as an ADPCM encoder or an ADPCM decoder.
REFERENCES:
patent: 4128832 (1978-12-01), Betts
patent: 4592070 (1986-05-01), Chow
patent: 4646322 (1987-02-01), Flanagin
"A Single Chip Processor for CCITT Standard ADPCM CODEC" M. Sato, et al. Feb. 14, 1985; IEEE International Solid State Circuits Conference.
"Overview of the ADPCM Coding Algorithm"; W. R. Daumer et al. Nov. 1984; IEEE Global Telecommunications Conference.
Kuroki Toshihiko
Nakamura Makoto
Suzuki Hideo
Kabushiki Kaisha Toshiba
Miller Charles D.
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