Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-09-22
1990-01-02
Shepperd, John W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358147, 455 70, 371 51, 371 48, H04N 7087, H04N 708
Patent
active
048917036
ABSTRACT:
A video program system (VPS) signal superimposed on a television signal is continuously stored in an input buffer. A determination process circuit determines whether or not the VPS signal stored in the input buffer is a normal signal. When the VPS signal stored in the input buffer is a no-signal, a count value of a no-signal counter is counted. When the count value of the no-signal counter exceeds a predetermined count value, the circuit determines that the VPS signal detected from the television signal is the no-signal. When VPS signals corresponding to various programs are stored in the input buffer, a count value of an error counter is counted. When the count value of the error counter exceeds a predetermined count value, the circuit determines that the input state of the VPS signal detected from the television signal is unstable. When the same VPS signal is continuously stored in the input buffer, the circuit determines that the VPS signal detected from the television signal is a normal signal.
REFERENCES:
patent: 4479146 (1984-10-01), Cohn
patent: 4706121 (1987-11-01), Young
Kabushiki Kaisha Toshiba
Parker Michael D.
Shepperd John W.
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