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

1987-04-27

1988-11-01

Schreyer, Stafford D.

Telephonic communications

Supervisory or control line signaling

Signal receiver

324 77B, H04M 100

Patent

active

047825235

ABSTRACT:
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.

REFERENCES:
patent: 4286326 (1981-08-01), Houdard
1979 IEEE International Conference on Acoustics, Speech & Signal Processing, Washington, D.C. "New Concept of Digital Multi-Frequency Receiver" pp. 863-867.
"Application of Digital Signal Processing to No. 5 Signalling System", pp. E.1.2.1-E.1.2.5.

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