Telephone circuit capable of inhibiting noise of customer premis

Details Telephone circuit capable of inhibiting noise of customer premis Telephone circuit capable of inhibiting noise of customer premis

1997-11-19

1999-07-20

Vo, Nguyen

Telephonic communications

Substation or terminal circuitry

Sidetone control or hybrid circuit

379215, 379 9335, H04M 100

Patent

active

059265426

ABSTRACT:
A telephone circuit is composed of a current circuit, an hybrid circuit, a noise inhibiting unit, and a CAS detector circuit. The current circuit has two input ends connected with tip and ring of the telephone line, and two output ends connected with two input ends of the hybrid circuit. The signal received by two input ends of the hybrid circuit is analyzed. The noise inhibiting unit is connected in series between the hybrid circuit and the CAS detector circuit and is provided with at least one inhibiting circuit which has two input ends connected with the first signal line and the second signal line of the hybrid circuit. The output ends of the inhibiting circuit are connected with two input ends of the CAS detector circuit for minimizing the error of identifying the CAS signal by the CAS detector circuit.

REFERENCES:
patent: 5263084 (1993-11-01), Chaput et al.
patent: 5519774 (1996-05-01), Battista et al.
patent: 5649002 (1997-07-01), Brady et al.
patent: 5745557 (1998-04-01), Anglikowski

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