Multistage selective differential pulse code modulation system

Details Multistage selective differential pulse code modulation system Multistage selective differential pulse code modulation system

1978-07-27

1980-10-21

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 28, H03K 1322

Patent

active

042298202

ABSTRACT:
A differential pulse code modulation system, in which an input signal is at first approximated to a stepwise waveform having level changes at a constant number n of sampling points selected in the order of level magnitude from a predetermined number N of samples in the input signal. The remainder of the above approximating operation is secondary followed-up by delta modulation, which uses a variable step level controlled in accordance with the variation feature of the remainder. The differential pulse code modulation output is provided by the above two approximating operations.

REFERENCES:
patent: 3518662 (1970-06-01), Nakagome
patent: 3573364 (1971-04-01), Shimamura
patent: 3594509 (1971-07-01), Shimamura
patent: 3796956 (1974-03-01), Fudemoto
patent: 3829779 (1974-08-01), Fujimoto
patent: 3925611 (1975-12-01), Dennis
patent: 4010422 (1977-03-01), Wouda
patent: 4021799 (1977-05-01), Hinoshita

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