Method and apparatus for detection of a telephone CPE...

Details Method and apparatus for detection of a telephone CPE... Method and apparatus for detection of a telephone CPE...

2005-09-06

2005-09-06

Tran, Sinh (Department: 2644)

Telephonic communications

Supervisory or control line signaling

Signal receiver

C379S377000, C379S351000, C379S142010

Reexamination Certificate

active

06940966

ABSTRACT:
A method and apparatus for detecting a signaling tone within a communications channel, such as a telephone line, is presented. The energy level of the communications channel signal is measured at the frequency of the signaling tone and at one or more frequencies that are integer divisors of the signaling tone (i.e. at one or more subharmonics). The subharmonic energies are evaluated in determining whether the signaling tone is present. The technique can be implemented using a plurality of resonators and a comparator.

REFERENCES:
patent: 5214693 (1993-05-01), Chujo
patent: 5519774 (1996-05-01), Battista et al.
patent: 5809133 (1998-09-01), Bartkowiak et al.
patent: 5896560 (1999-04-01), Pfiefer et al.
patent: 6122353 (2000-09-01), Brady et al.

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