Multiple-loop adaptive delta modulator

Pulse or digital communications – Repeaters – Testing

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Details

332 11D, 381 32, H04B 1204

Patent

active

044110030

ABSTRACT:
An adaptive delta modulator employs an additional feedback loop to produce a more accurate estimate of the input signal. The delta modulated bit stream is applied to a filter having variable filter characteristics such as bandwidth, the output of the filter being combined with the signal estimated by the prior art adaptive delta modulator. The characteristics of the incoming signal, such as bandwidth, are determined by examining the prior art estimated signal, and the filter characteristics of the additional feedback loop are varied in accordance therewith.

REFERENCES:
patent: 3026375 (1962-03-01), Graham
patent: 3746990 (1973-07-01), Diberder et al.
patent: 3922606 (1975-11-01), Nordling

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