H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
H04Q 1/46 (2006.01) H04L 27/30 (2006.01) H04Q 1/457 (2006.01)
Patent
CA 2081535
- 46 - The present invention provides a method and apparatus for detecting control signal information for an element of a communication system. The controlsignal information is included in one or more segments of a signal communicated over a communication system channel. The invention provides for the application of a plurality of tapers to a segment of a communicated signal; the transformation of a tapered segment; the determination of a similarity score based on a transform of a tapered segment and a model of a control signal; the identification of control signal information based on a similarity score; and the creation of an indicator signalrepresentative of the identified control signal information to the communicationsystem element. The control signal information may comprise a dual-tone multi- frequency signal. The tapers may comprise a discrete prolate spheroidal sequence. A similarity score may be determined based on a ratio of energy distributions. The numerator of the ratio may comprise an energy distribution based on a control signal model, and the denominator of the ratio may comprise an energy distribution based on a difference between a transformed tapered segment and the control signal model.
Lindberg Craig Robert
Thomson David James
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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