Digital code converter

Details Digital code converter Digital code converter

1982-10-22

1985-05-21

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

375 27, 375 34, H03K 1324

Patent

active

045189501

ABSTRACT:
Accumulation of distortion possible from multiple digital code conversions is eliminated in an ADPCM coder that converts PCM incoming signals, e.g., .mu.-law PCM to linear PCM and, then, to a quantized n-bit differential PCM output signal. Elimination of distortion accumulation in subsequent code conversion stages is realized in the coder when the differential PCM output is not on the most positive or most negative ADPCM quantizer steps by controllably modifying the coder differential PCM output so that a next subsequent coder would generate the same differential PCM value.
Accumulation of distortion in subsequent code conversions when the differential PCM coder output is either the most positive or most negative quantizer step is eliminated by controllably modifying a decoder output so that the next subsequent code converter will choose the same ADPCM code value.

REFERENCES:
patent: 3937897 (1976-02-01), Song
patent: 3949299 (1976-04-01), Song
patent: 4437087 (1984-03-01), Petr
patent: 4475227 (1984-10-01), Belfield
"A Low Noise ADPCM-Log PCM Code Converter", 1979 International Symposium on Circuits and Systems, Proceedings, IEEE Catalog No. 79 CH1421-7 CAS, pp. 969-970, Jul. 17-19, 1979, by Hideyo Murakami.

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