Near-instantaneous companding PCM involving accumulation of less

Details Near-instantaneous companding PCM involving accumulation of less Near-instantaneous companding PCM involving accumulation of less

1984-04-02

1986-12-30

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 27, 375122, H03M 730

Patent

active

046334831

ABSTRACT:
A data transmission system combines a near-instantaneous companding system with PCM or DPCM transmission data. In the transmitting side, lower bits are removed from an original data, to form transmission data and are accumulated in an accumulator. When a carry is caused as a result of such accumulation, the carry is added to the transmission data. Thus, total amount of the original data can be transmitted to the receiving side, thereby to improve a transmission quality and to reduce quantizing-noise. When the removed bits are subject to an addition, it is determined whether an overflow occurs. When the overflow occurs, the addition is not performed and such a logic operation as to prevent the overflow is performed.

REFERENCES:
patent: 3723909 (1973-03-01), Condon
patent: 3927372 (1975-12-01), Zschunke
patent: 4005274 (1977-01-01), Vagliani et al.
patent: 4205200 (1980-05-01), Parikh et al.
patent: 4352191 (1982-09-01), Un

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