Method and apparatus for detection of a telephone CPE alerting signal
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United States of America Patent
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Sep 6, 2005
Grant Date -
Aug 21, 2003
app pub date -
Feb 21, 2002
filing date -
Feb 21, 2002
priority date (Note) -
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Abstract
A method and apparatus for detecting a signaling tone within a communications channel, such as a telephone line, is presented. The energy level of the communications channel signal is measured at the frequency of the signaling tone and at one or more frequencies that are integer divisors of the signaling tone (i.e. at one or more subharmonics). The subharmonic energies are evaluated in determining whether the signaling tone is present. The technique can be implemented using a plurality of resonators and a comparator.
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