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TECHNIQUE FOR DETECTING LONG DURATION PULSES FROM A TRAIN OF SHORT DURATION PULSES
TECHNIQUE FOR DETECTING LONG DURATION PULSES FROM A TRAIN OF SHORT DURATION PULSES
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机译：从短时脉冲序列中检测长时脉冲的技术
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摘要
A circuit particularly adapted for detecting the occurrence of vertical sync pulses in a composite television synchronization pulse train. In a first subcircuit horizontal and equalizing pulses are inverted, while the subcircuit acts as a one-shot for the longer pulses in the vertical sync interval. The input and subcircuit output are summed so that cancellation is achieved until the one-shot action has concluded in the vertical sync interval. The remaining portion of the vertical sync interval thus is not cancelled and is used to generate an output pulse that indicates the occurrence of the vertical sync period.
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