Time base corrector

Details Time base corrector Time base corrector

1985-09-19

1987-08-18

Faber, Alan

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

360 381, 358339, 358336, 358160, H04N 594, H04N 595

Patent

active

046881115

ABSTRACT:
In a time base corrector incorporated in a VTR, if a time during which a vertical synchronizing signal is written in a memory unit exceeds one horizontal period segment, the video signal stored at the first address of the memory unit is dropped out during data reading operation. To overcome the above problem, a write address designation signal is initially latched in response to a vertical synchronizing signal; a predetermined number is subtracted from the latched address number; the subtracted address number is loaded in a counter in response to a reference vertical synchronizing signal and is incremented in response to a reference horizontal synchronizing signal in order to shift the read start address, thus preventing video signals stored in the memory unit from being dropped off.

REFERENCES:
patent: 4134131 (1979-01-01), Hopkins
patent: 4215376 (1980-07-01), Mach
patent: 4389678 (1983-06-01), Mizukami
patent: 4626912 (1986-12-01), Wilkinson

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