Timing audio and visual signals with coincidental markers
A method for timing audio and video component signals of a television signal with coincidental markers generates (22-24) a field pulse every Nth field of the television signal at the transmitter. The duration of the field pulse is approximately one video field, and is used to enable an audio tone ge...
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| Format: | Patent |
| Sprache: | eng ; fre ; ger |
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| Zusammenfassung: | A method for timing audio and video component signals of a television signal with coincidental markers generates (22-24) a field pulse every Nth field of the television signal at the transmitter. The duration of the field pulse is approximately one video field, and is used to enable an audio tone generator (30) for the one video field and to switch (10) 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 (16) to a waveform display device (18), 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 coincidence as at the transmitter. |
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