Signal detector circuit

Details Signal detector circuit Signal detector circuit

H - Electricity

04

B

325/117, 350/88,

H04B 1/16 (2006.01) H03J 7/18 (2006.01) H03J 7/28 (2006.01)

Patent

CA 1171911

ABSTRACT OF THE DISCLOSURE 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.

388960

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