Method and apparatus for synchronizing record and playback of vi

Details Method and apparatus for synchronizing record and playback of vi Method and apparatus for synchronizing record and playback of vi

1975-04-25

1977-01-25

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 946, H04N 576

Patent

active

040054730

ABSTRACT:
Methods and apparatus for the encoding with synchronization information of video signals to be recorded and for subsequently decoding the signals in a synchronous manner. A standard broadcast format video signal is stripped of its sync signal and separated into its luminance and chrominance components. Additional sync or chroma identifying information for decoding purposes is added in the blanking period between each horizontal sync pulse and each subsequent picture signal information. The chrominance signals and added sync information are processed by a two-stage modulation network, added to the luminance signal and recorded. Upon playback, the encoded signal is decoded by a two-stage demodulation network which utilizes the added sync information to achieve synchronization. Time base-error correction is also effected by comparing a known frequency with a reconstituted carrier frequency taken from the encoded video signal and adjusting the replay speed or the time delay of decoding in dependence upon the frequency difference.

REFERENCES:
patent: 3255303 (1966-06-01), Kihara
patent: 3659040 (1972-04-01), Fujita
patent: 3729579 (1973-04-01), De Boer
patent: 3821788 (1974-06-01), Kobayashi

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