Universal telephony tones detector

Details Universal telephony tones detector Universal telephony tones detector

2005-03-15

2005-03-15

Tse, Young T. (Department: 2637)

Pulse or digital communications

Transceivers

Modems

C370S286000, C370S289000

Reexamination Certificate

active

06868116

ABSTRACT:
A signalling tone detector for use in a communications network carrying voice traffic incorporating single frequency and dual frequency signalling tones comprises a first output path, a second output path, and a switch arranged to selectively couple an input signal to one or other of the output paths. The detector is used for the selective disablement of an echo canceller in the presence of signalling tones.

REFERENCES:
patent: 3937899 (1976-02-01), Denenberg
patent: 5029204 (1991-07-01), Shenoi et al.
patent: 5533121 (1996-07-01), Suzuki et al.
patent: 5689556 (1997-11-01), Gupta et al.
patent: 5694517 (1997-12-01), Sugino et al.
patent: 5815568 (1998-09-01), Trump
patent: 6370555 (2002-04-01), Bartkowiak
patent: 6549587 (2003-04-01), Li

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