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

058504389

ABSTRACT:
In a transmission system, a tone is transmitted by a transmitter to a receiver via a transmission channel. In the receiver, a tone detector is used to detect the presence of a signalling tone. In order to improve a reliability of the tone detector when the arrival of the signalling tone is unknown, a number of correlators having mutually displaced measuring periods are used. More than two correlators are used in order to reduce the measuring period, also resulting in an improved reliability of the tone detection.

REFERENCES:
patent: 4064488 (1977-12-01), Chapman
patent: 4088960 (1978-05-01), Osborne
patent: 4100378 (1978-07-01), Classen 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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