Detection of tones while minimizing incorrect identification of

Details Detection of tones while minimizing incorrect identification of Detection of tones while minimizing incorrect identification of

1997-01-15

1998-06-09

MacDonald, Allen R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704219, 36472409, 370526, H04M 150

Patent

active

057651256

ABSTRACT:
A first validation circuit utilizes residual energy unaccounted for by a linear predictive coding model for a specified order of model as a criteria on which to make a validity determination of whether a valid tone or digit has been received. A second validation circuit operating in conjunction with the first validation circuit utilizes discrete Fourier transforms at the center and adjacent frequencies to energy peaks associated with tones. A ratio of the peak energy to the adjacent energies is utilized in combination with corresponding thresholds to make a validity determination. The combination of the first and second validation circuit provides a high level of confidence that a particular tone or digit has been detected.

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"Algorithms for Multi-Channel DTMF Detection for the WE.RTM.DSP32 Family", S. L. Gay, J. Hartung and G. L. Smith, Int'l Conference on Acoustics, Speech and Signal Processing (ICASSP), vol. 2, 23-26 May, 1989, Glasgow, Scotland, pp. 1134-1137.
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"Linear Prediction Based DTMF Detection for the WE.RTM.DSP32 Digital Signal Processor Family", S.L. Gay, J. Hartung and G.L. Smith, Jun. 1989 pp. 1-19 .

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