Digital velocity error compensator

Details Digital velocity error compensator Digital velocity error compensator

1981-12-18

1984-04-17

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 9491

Patent

active

044438214

ABSTRACT:
A velocity error compensator is provided for use in a time base corrector of the type having a memory into which successive samples of a periodic information signal, such as a video signal, are written at a write-in rate that is synchronized with time base errors in the information signal, such that plural periods, such as plural lines, of the information signal are stored in the memory, and from which the successive samples are read at a constant read-out rate. The velocity error compensator comprises a velocity error detector for detecting velocity errors in successive periods, or lines, of the information signal written into the memory; and a sample level compensator for compensating the level of a sample read out from the memory as a function of the detected velocity error, such that the level of the read out sample is modified to be equal to the level that the read out sample should have had at the time it was read out if there had been no velocity error.

REFERENCES:
patent: 3860952 (1975-01-01), Tallent et al.
patent: 4081826 (1978-03-01), Ninomiya
patent: 4165524 (1979-08-01), Ninomiya
patent: 4393413 (1983-07-01), Kaneko

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