Detection circuit for detecting standard television signals and

Details Detection circuit for detecting standard television signals and Detection circuit for detecting standard television signals and

1987-06-18

1989-04-11

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358148, H04N 944

Patent

active

048211125

ABSTRACT:
There is provided a detection circuit for TV receiver which includes a frame comb filter and a field comb filter and which generates a luminance signal or a chrominance signal by effecting addition or subtraction upon video signals of two frames adjoining each other included in the received TV signal. This detection circuit includes a synchronization separation circuit, an APC circuit, a frequency division circuit connected to the APC circuit, and a comparator circuit connected to the frequency division circuit. The frequency of the chrominance subcarrier signal is demultiplied by the frequency division circuit. The phase of the chrominance subcarrier signal thus frequency-divided is compared with the phase of the synchronizing signal separated by the synchronizing separation circuit. It is thus judged whether the received TV signal is a standard TV signal or a nonstandard TV signal.

REFERENCES:
patent: 4255759 (1981-03-01), Ohmori et al.
patent: 4335403 (1982-06-01), Srivastava
patent: 4454531 (1984-06-01), Elmis et al.
patent: 4488170 (1984-12-01), Nillesen
patent: 4613827 (1986-09-01), Takamori et al.
patent: 4635099 (1987-01-01), Nicholson et al.
patent: 4739390 (1988-04-01), Achiha et al.
Achiha et al., A Motion-Adaptive High-Definition Converter for NTSC Color TV Signals, Journal SMPTE vol. 93, No. 5, pp. 470-476, May 1984.
Nikkei Electronics, Jul. 1985, pp. 195-218.

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