All digital delta to PCM converter

Details All digital delta to PCM converter All digital delta to PCM converter

1975-12-03

1977-11-08

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

325 38B, 332 11D, H03K 1322

Patent

active

040577970

ABSTRACT:
A digital circuit for converting a delta modulated signal to a binary coded signal without producing an interim analog signal. The principal portions of the circuit are an up-down counter, a read-only memory the instantaneous output of which is controlled by the up-down counter, logic for driving the up-down counter in response to an incoming delta modulated signal, and a scanner for producing time-spaced pulses in response to the instantaneous outputs of the memory. A comparator is also included for driving the up-down counter relatively slowly to compensate for drift by ensuring that, over relatively long periods such as a few seconds, the output of the up-down counter oscillates around its mid-value.

REFERENCES:
patent: 3596267 (1971-07-01), Goodman
patent: 3750144 (1973-07-01), Bolus et al.
patent: 3795900 (1974-03-01), Monford
patent: 3922619 (1975-11-01), Thompson
Jones, "Digital Transversal Filter with Read-Only Memory," IBM Technical Disclosure Bulletin, vol. 15, No. 3, 8/72, pp. 976, 977.

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