Tone detection process and device for implementing said process

Details Tone detection process and device for implementing said process Tone detection process and device for implementing said process

H - Electricity

04

M

340/203, 379/59

H04M 1/00 (2006.01) H04Q 1/457 (2006.01)

Patent

CA 1284679

ABSTRACT TONE DETECTION PROCESS AND DEVICE FOR IMPLEMENTING SAID PROCESS The process is made to detect a received tone including at least one single predetermined frequency, within a signal encoded using block coding and Linear Prediction Coding techniques providing auto-correlation coefficients R(i) and direct form coefficients a(i). The process is based upon Fourier Transform computations over the successive blocks of a(i)'s, with table look up tone identification, further confirmed upon R(i)'s stationarity detecting.

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