Squelch circuit and communication apparatus used with the same

Details Squelch circuit and communication apparatus used with the same Squelch circuit and communication apparatus used with the same

2005-12-01

2009-02-10

Phu, Sanh D (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Squelch

C455S212000, C455S222000, C455S223000, C375S217000

Reexamination Certificate

active

07489915

ABSTRACT:
A squelch circuit and a communication apparatus used with the same that are able to generate a squelch signal even if a squelch period is short and an operation of a squelch detecting circuit is insufficient, the circuit having: a squelch detecting circuit detecting the existence of a signal on a communication line in response to a transmission signal or a received signal and generating a first squelch signal; and a squelch control circuit generating a squelch mask signal in response to the first squelch signal and a transmission control signal and generating a second squelch signal based on the squelch mask signal and the control signal. The first squelch signal is controlled by the transmission signal to generate the second squelch signal in which the lacked portion of the first squelch signal is temporally restructured.

REFERENCES:
patent: 5179577 (1993-01-01), Ilyadis
patent: 5436934 (1995-07-01), Co
patent: 6259904 (2001-07-01), Branner et al.
patent: 02-095030 (1990-04-01), None

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