Sync signal separator apparatus

Television – Synchronization – Sync separation

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348465, H04N 504

Patent

active

059951575

ABSTRACT:
In a composite video signal that contains an image field having vertical synchronization (V.sub.-- Sync) pulses, The V.sub.-- sync pulses include first equalization pulses of E.sub.1 waveforms followed by a serration pulses of S waveforms, T.sub.S -long each, followed by a second equalization pulse of E.sub.2 waveforms, T.sub.E -long each. The transition from a last waveform of the E.sub.1 waveforms to a first waveform of the S waveforms constitutes a vertical synchronization (V.sub.-- sync) signal. The system a reference event occurring at a first time interval .DELTA.T .sub.1 .+-.Er after said V.sub.-- sync signal, wherein Er stands for time shift error. The system includes filter for filtering the composite video signal so as to obtain a filtered signal. Clamper for clamping the filtered signal so as to obtain a clamped signal. First detector for detecting N (N.ltoreq.S) waveforms in the serration pulses thereby indicating first event occurrence. Second detector for detecting M (M.ltoreq.E.sub.2) waveforms in the second equalization pulses, thereby determining the reference event occurrence, such that the .DELTA.T .sub.1 equals M*T.sub.E +S*T.sub.S.

REFERENCES:
patent: 4170026 (1979-10-01), Nagaoka et al.
patent: 4654708 (1987-03-01), De La Guardia

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