Method for recognition of video standards and circuit implementi

Details Method for recognition of video standards and circuit implementi Method for recognition of video standards and circuit implementi

1995-02-24

1997-12-02

Kostak, Victor R.

Television

Basic receiver with additional function

Multimode

345213, 348525, H04N 546

Patent

active

056941757

ABSTRACT:
A method for the recognition of video standards, in which an up/down counter is used to detect the polarity of synchronization pulses. Specifically, a value representing a duration is memorized, a counting value (Q) is produced, this value being incremented when a binary synchronization signal (INCI) is in one state and decremented when this signal is in the other state, a comparison is made of the value representing the duration and the counting value, at a given time, of the synchronization signal, and a signal representing the standard is produced as a function of the result of the comparison. This method is implemented by a circuit comprising a microcontroller, a detection circuit producing a pick-up control logic signal (CAP), a counter producing a counting value (Q) and a register to load the counting value when the pick-up control signal is active.

REFERENCES:
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patent: 5031118 (1991-07-01), Morizot
patent: 5241281 (1993-08-01), Wilkes
patent: 5394171 (1995-02-01), Rabii
patent: 5473387 (1995-12-01), Okada et al.
patent: 5502501 (1996-03-01), Rumreich et al.

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