Method and structure for detecting a customer premises equipment

Details Method and structure for detecting a customer premises equipment Method and structure for detecting a customer premises equipment

1996-08-29

1999-01-19

Zele, Krista

Telephonic communications

Supervisory or control line signaling

Signal receiver

379257, 379283, 379351, H04M 150

Patent

active

058622128

ABSTRACT:
A method and device for detecting a customer premises equipment alerting signal (CAS) tone in a telephone system which has both caller identification and call waiting. The present invention distinguishes between valid CAS tones transmitted by the telephone company central office and invalid CAS tones which are caused by music or a human voice. The present invention samples detected tone during a plurality of sample periods. The change of frequency, as well as the direction of frequency change, between successive sample periods is calculated. The number of transitions in the direction of frequency change are counted and used to determine whether the detected tone corresponds to a valid CAS tone or an invalid CAS tone.

REFERENCES:
patent: 4395595 (1983-07-01), Nishitani et al.
patent: 4669114 (1987-05-01), Reesor et al.
patent: 5109409 (1992-04-01), Bomgardner et al.
patent: 5251256 (1993-10-01), Crowe et al.
patent: 5307404 (1994-04-01), Yatsunami
patent: 5353342 (1994-10-01), Pietrowicz
IEE Journal Of Solid-State Circuits, vol. 26, No. 7, Jul. 1991, New York, NY-USA, pp. 1027-1037, XP000237045, R. Becker et al: "Sigfred: A Low-Power DTMF and Signaling Frequency Detector".

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