Timing audio and video signals with coincidental markers

Details Timing audio and video signals with coincidental markers Timing audio and video signals with coincidental markers

1989-03-10

1990-10-16

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, 358149, H04N 704, H04N 504

Patent

active

049639676

ABSTRACT:
A method for timing audio and video component signals of a television signal with coincidental markers generates a field pulse every Nth field of the televison signal at the transmitter. The duration of the field pulse is approximately one video field, and is ued to enable an audio tone generator for the one video field and to switch a distinctive video signal, such as a flat video signal, into the video component signal for the one video field. At the receiver the two component signals are input through a synchronizer to a waveform display device, such as an oscilloscope, to observe the time differential between the two markers in the audio and video component signals. The audio component signal is delayed by the synchronizer until the markers are again in time conicidence as at the transmitter.

REFERENCES:
patent: 4218705 (1980-08-01), Inaba et al.
patent: 4258385 (1981-03-01), Greenberg et al.
patent: 4313135 (1982-01-01), Cooper
patent: 4618890 (1986-10-01), Kouyama et al.
patent: 4644400 (1987-02-01), Kouyama et al.
patent: 4703355 (1987-10-01), Cooper
patent: 4851909 (1989-07-01), Noske et al.

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