Method and apparatus for detecting dual tone alerting signal...

Details Method and apparatus for detecting dual tone alerting signal... Method and apparatus for detecting dual tone alerting signal...

H - Electricity

04

Q

H04Q 1/45 (2006.01) H03L 7/085 (2006.01) H03L 7/099 (2006.01) H03L 7/14 (2006.01) H03L 7/18 (2006.01) H04J 3/06 (2006.01) H04M 1/50 (2006.01) H03L 7/095 (2006.01) H04L 12/56 (2006.01)

Patent

CA 2327907

An apparatus for detecting a dual tone alert signal in a telephone system capable of at least off hook mode operation includes a processing channel for each tone. Each channel consists of a bandsplit filter for extracting the tone of interest and attenuating the other tone; a comparator for comparing the output of said bandsplit filter with a threshold value; and an adaptive threshold generator for generating said threshold value adapted to the amplitude of the output of said bandsplit filter to reject speech and music imitations. The apparatus offers improved talkdown and talkoff immunity.

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