System for time compression and/or expansion of electrical signa

Details System for time compression and/or expansion of electrical signa System for time compression and/or expansion of electrical signa

1983-09-07

1986-11-18

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 21R, 358138, 358260, 455 72, 370109, 381 34, H04N 514

Patent

active

046239227

ABSTRACT:
A system for time compression and/or expansion of video signals is disclosed. Samples of the video signals are interpolated, written in a memory and read out of the memory. Clock signals used for writing into and reading from the memory include a continuous pulse sequence and a pulse sequence having the same pulse frequency except that certain pulses are suppressed in accordance with predetermined compression of expansion factors. In this manner a substantially continuous compression or expansion is obtained by using a circuit of relatively simple design.

REFERENCES:
patent: 4134128 (1979-01-01), Hurst
patent: 4200890 (1980-04-01), Inaba et al.
patent: 4302776 (1981-11-01), Taylor et al.

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