Transmission system with improved tone detection

Details Transmission system with improved tone detection Transmission system with improved tone detection

1996-04-16

1998-12-15

Matar, Ahmad F.

Telephonic communications

Supervisory or control line signaling

Signal receiver

379282, 379351, 704263, H04M 100

Patent

active

058504370

ABSTRACT:
In a transmission system, a signalling tone is transmitted by a transmitter to a receiver via a transmission channel. In the receiver, a tone detector detects the presence of a signalling tone. In order to improve a reliability of the tone detector, a number of correlating elements which determine a correlation value between an input signal and a reference signal are used. Absolute output signals of the correlating elements are added by an adder to derive a combined correlation signal to be used for detection.

REFERENCES:
patent: 4064488 (1977-12-01), Chapman
patent: 4088960 (1978-05-01), Osborne
patent: 4100378 (1978-07-01), Claasen et al.
patent: 4216463 (1980-08-01), Backof, Jr. et al.
patent: 4363100 (1982-12-01), Agnew et al.
patent: 4769610 (1988-09-01), Weiss
patent: 4783845 (1988-11-01), McChesney et al.
patent: 5519774 (1996-05-01), Battista et al.
"ADSI: maximixing the synergy between the network and terminals" by B. Bowles in Telephony, Aug. 29, 1994.

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