Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By polarity
Patent
1997-09-03
1999-11-02
Lam, Tuan T.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By polarity
327172, 345213, H04N 504
Patent
active
059778024
ABSTRACT:
The present invention relates to a circuit for processing vertical synchronization logic signals of positive or negative polarity. Based on signals locating, on the one hand, the presence of the beginning of a pulse and, on the other hand, the rising and falling edges in the synchronization signals, a brief pulse is provided in a signal generated by a one-shot. This pulse induces the generation of edges in signals controlling a latch which generates a logic detection signal. According to the polarity of the received signals, the latch is set or reset and the state of the detection signal indicates the polarity of the synchronization signals.
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Cirot Eric
Lebouleux Nicolas
Lam Tuan T.
SGS-Thomson Microelectronics S.A.
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