Abstract: An input voltage controlled oscillator circuit for a digital video time base corrector used to process television signals to remove time base errors introduced during signal recording, reproducing, or transmission. In the time base corrector, incoming video signals are converted from analog-to-digital form, temporarily stored in a memory unit at a clocking rate which varies in a manner generally proportional to the time base errors, and the stored signals are fetched at a standard clocking rate.The input voltage controlled oscillator circuit generates the clock signals for performing the analog-to-digital conversion and for storing the digital signals in the memory unit. The frequency of the clock signals varies in accordance with the time base errors in the composite sync and burst portions of the incoming video signals.

Abstract: A sequence control unit for a digital video time base corrector used to process television signals to remove time base errors introduced during signal recording, reproducing, or transmission. In the time base corrector, incoming video signals are converted from analog to digital form, temporarily stored in a memory unit at a clocking rate which varies in a manner generally proportional to the time base errors, and the stored signals are fetched at a standard clocking rate. The sequence control unit controls contemporaneous storing and fetching from different portions of the memory unit and includes circuitry for preventing application of both store and fetch signals to the same memory unit portion when the accumulated time base error would cause such an overlap condition.