Method and apparatus of inserting an address signal in a video signal
AssigneeSony Corporation
InventorKatsuichi Tachi
Life of this patent
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Abstract
Method and apparatus for inserting an address signal in a video signal by compressing the SMPTE (Society of Motion Picture And Television Engineers) time code signal and then inserting the compressed time code signal into three successive vertical blanking periods of the video signal. The invention allows the time code signals to be reconstructed where the record medium is stopped or transported at very low speeds.
Claims6
A method of inserting an address signal in a video signal having a chrominance subcarrier having a frequency equal to 455/2 of the horizontal line frequency comprising the steps of:
- (a) providing the address signal having a plurality of time code bits corresponding to one field or frame of the video signal, the frequency of said bits being selected at (1/N) of said subcarrier frequency, wherein N is an integer more than one,
- (b) selecting at least one predetermined horizontal line within a vertical blanking period from each field or frame of said video signal, and
- (c) inserting said address signal in said selected one horizontal line.
An apparatus for producing a video signal having a chrominance subcarrier having a frequency equal to 455/2 of the horizontal line frequency with an address signal therein, comprising:
- (a) means for providing the address code corresponding to one field or frame of the video signal, said address code consisting of a plurality of time code bits,
- (b) means for converting said address code into an address signal having a shorter duration than one horizontal line of said video signal,
- a bit frequency of said address signal being selected at (1/N) of said subcarrier frequency, wherein N is an integer more than one,
- (c) means for selecting at least one predetermined horizontal line within a vertical blanking period of each field or frame of said video signal, and
- (d) means for inserting said address signal in said selected one horizontal line.
Dependencies are inferred from the claim text.