LPC-based DTMF receiver for secondary signalling

Details LPC-based DTMF receiver for secondary signalling LPC-based DTMF receiver for secondary signalling

1988-06-02

1989-08-01

Brown, Thomas W.

Telephonic communications

Supervisory or control line signaling

Signal receiver

364484, 36472803, 3701103, 379283, H04J 312, H04M 322

Patent

active

048539589

ABSTRACT:
A dual tone multi-frequency (DTMF) receiver for use in detecting digitally transmitted signals in the telephone industry. The receiver derives linear predictive coefficients for the digital signals in the data frame. This information is used to compute frequency response magnitudes at the DTMF frequencies. A plurality of magnitude comparisons are then performed to verify the presence of true DTMF signals and concurrently the frequency of these signals is obtained.

REFERENCES:
patent: 4211897 (1980-07-01), Ichikawa et al.
patent: 4614909 (1986-09-01), Jarvfalt

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