Circuitry for processing a synchronizing signal

Details Circuitry for processing a synchronizing signal Circuitry for processing a synchronizing signal

1989-09-11

1991-03-26

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358153, H04N 504

Patent

active

050033913

ABSTRACT:
Circuitry for processing, in a television signal, a first, low-frequency synchronizing signal on which a second, high-frequency synchronizing signal is superposed, for supplying standardized television signal capable of being processed by a customary television signal processing arrangement or display device, respectively by inhibiting a shift between the picture content of the signal representing the television signal and the synchronizing signal. The circuitry includes a first signal processing branch (1) having a low-pass filter (11) for separating low-frequency components and consequently the first synchronizing signal (Sy1) from the television signal, a synchronizing pulse detector (12) for detecting signal variations exceeding a cut-off level (SP) in the low-frequency components, and also a pulse generating stage (13) for producing a pulse when such a signal variation corresponding to a synchronizing pulse of the first synchronizing signal (Sy1) is detected, the pulse being of a duration shorter than the shortest second synchronizing signal (Sy2), a second signal processing branch (2) having a halfwave detector (21) for separating signal peaks exceeding maxima (MaSy1) of the first synchronizing signal (Sy1) from the television signal and for charging a signal store (23) in a first direction during a time interval corresponding to the period of the second synchronizing signal (Sy2), in which the signal peaks occur, and also a third signal processing branch (3) producing a constant reference level during a time interval wherein either a pulse is supplied in the first signal processing stage (1) or the signal store (23) is charged in the first direction, instead of the television signal produced in the remaining time.

REFERENCES:
patent: 3504115 (1970-03-01), Suzuki et al.
patent: 4228464 (1980-10-01), Duijkers

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