Television – Synchronization – Locking of video or audio to reference timebase
Patent
1994-12-08
1996-08-06
Metjahic, Safet
Television
Synchronization
Locking of video or audio to reference timebase
348497, H04N 9475
Patent
active
055438547
ABSTRACT:
A video signal processing apparatus, video signal recording/reproduction apparatus, and method therefor, perform arithmetic operations upon an input video signal and the input signal delayed by a predetermined amount of time. A memory stores the input signal for the predetermined amount of time in order to produce the delayed input video signal. A controller controls the memory to store the input video signal for the predetermined amount of time based on a main synchronization signal. A first synchronization signal is produced by separating a synchronizing signal from the input video signal. A second synchronization signal is generated based on the first synchronization signal. During operation, a switching unit supplies the first synchronization signal to the controller as the main synchronization signal until the second synchronization signal becomes synchronized with the first synchronization signal. Once the second synchronization signal becomes synchronized with the first synchronization signal, the switching unit supplies the second synchronization signal to the controller as the main synchronization signal. In this manner, jitter caused by noise or distortion in the first synchronization signal separated from the input video signal is eliminated by the switching to the second synchronization signal. The second synchronizing signal is not affected by noise or waveform distortion; and consequently, arithmetic operations in the correct time axis are performed.
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Kodama Masafumi
Morikawa Yasuhiro
Ohashi Tomonori
Lee Michael H.
Metjahic Safet
Mitsubishi Denki & Kabushiki Kaisha
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