High speed voice replay via digital delta modulation

Details High speed voice replay via digital delta modulation High speed voice replay via digital delta modulation

1977-07-11

1978-05-23

Brown, Thomas W.

325 38B, G11B 1300

Patent

active

040912426

ABSTRACT:
A method of and apparatus for time compression and changing the readout speed of a delta modulation encoded audio signal. The encoded audio signal has portions selectively deleted therefrom in accordance with detected zero crossovers of the same sign which occur in a predetermined timing sequence. The encoded audio signal which has had portions selectively deleted therefrom is decoded, with the undeleted decoded portions being joined. The undeleted portions have the same gain factor where joined, thereby eliminating step transients.

REFERENCES:
patent: 3104284 (1963-09-01), French et al.
patent: 3949175 (1976-04-01), Tanizoe et al.
patent: 3971987 (1976-07-01), Carrubba et al.

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