Signal detector circuit

Details Signal detector circuit Signal detector circuit

1981-10-27

1983-08-16

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

3581931, 3581951, H04N 550

Patent

active

043994636

ABSTRACT:
A circuit for detecting the presence or absence of a television receiving signal is disclosed, wherein a detection output for automatic frequency control is compared with first to fifth levels. A low-level output is produced when the detection output is lower than the fifth level; an intermediate-level output is produced when the detection output is between the fifth and fourth levels; a low-level output is produced when the detection output is between the third and second levels; an intermediate-level output is produced when the detection output is between the second and first levels; and a high-level output is produced when the detection output is higher than the first level, thus producing an output signal of three-digit level from a single output terminal.

REFERENCES:
patent: 4249256 (1981-02-01), Molinari
patent: 4280140 (1981-07-01), Skerlos
patent: 4303944 (1981-12-01), Kitamura

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