Telephonic communications – Supervisory or control line signaling – Signal receiver
Patent
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
Beyrouti Michael G.
Mermelstein Paul
Rabipour Rafi
Brown Thomas W.
Mowle John E.
Northern Telecom Limited
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