Circuit for identifying television standards

Details Circuit for identifying television standards Circuit for identifying television standards

1993-09-16

1995-03-21

Goody, James J.

Television

Basic receiver with additional function

Multimode

348555, H04N 546, H04N 964

Patent

active

054000785

ABSTRACT:
A Standard identification circuit has a capacitor that is gradually charged in a constant progression direction if the Standard is appropriate and in a reverse progression direction when the voltage across the capacitor reaches a low threshold. The circuit operates symmetrically (the charging and discharging currents of the capacitor have equal value) when the voltage across the capacitor is lower than an intermediate threshold, and operates asymmetrically (the discharging current is higher than the charging current) when the voltage is higher than the intermediate threshold.

REFERENCES:
patent: 4240102 (1980-12-01), Goenewes
patent: 4438451 (1984-03-01), Hinn et al.
IEEE Transactionson Consumer Electronics, vol. 31, No. 3, Aug. 1985, New York, US. pp. 147-155, Peru et al., "A Fully Automatic Multistandard TV Chrominance Decoder".

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