Circuit for discriminating output of squelch circuit and...

Details Circuit for discriminating output of squelch circuit and... Circuit for discriminating output of squelch circuit and...

2007-09-13

2010-11-23

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

C375S376000

Reexamination Certificate

active

07839183

ABSTRACT:
A circuit for discriminating a ‘Noisy’ state of an output of a squelch circuit is disclosed. A circuit for resolve the ‘Noisy’ state of the output of the squelch circuit is also disclosed which uses the output identification circuit. The output of the squelch circuit and a clear signal are input into a first AND gate. The output of the first AND gate is input into a first flip-flop. An inversed signal of the output of the first AND gate is input into a second flip-flop. The outputs of the first and second flip-flops are input into a discriminating unit including a second AND gate. The ‘Noisy’ state is identified by the output of the second AND gate. Based on the identification result, sensitivity of the squelch circuit is regulated.

REFERENCES:
patent: 5436934 (1995-07-01), Co
patent: 5446921 (1995-08-01), Tobler
patent: 6081572 (2000-06-01), Filip
patent: 6486710 (2002-11-01), Simoni
patent: 6954510 (2005-10-01), Lee

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