Time base corrector

Details Time base corrector Time base corrector

H - Electricity

04

N

350/62

H04N 9/12 (2006.01) H04N 9/896 (2006.01)

Patent

CA 1170353

38/SOl567 TIME BASE CORRECTOR ABSTRACT OF THE DISCLOSURE A time base corrector for removing time base errors from composite color video signals has a write clock and write start pulse generating circuit for pro- viding write clock and write start pulses in synchronism with horizontal sync signals separated from the incoming composite color video signal, a read clock and read start pulse generating circuit receiving reference video signals and being operative to generate read clock and read start pulses on the basis of such reference video signals, a memory into which the incoming color video signals are written for temporary storage in response to the write clock and write start pulses and from which the tempor- arily stored color video signals are read in response to the read clock and read start pulses, a circuit connected with the read clock and read start pulse generating cir- cuit for provided added sync and sub-carrier signals which are inserted in the color video signals from the memory, and a phase control circuit for varying a phase of the separated horizontal sync signals with which the write clock and write start pulses are synchronized in accordance with changes in the relative phase of the read start pulses and the added sync signals.

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