Tone-detection method for detecting at least one tone in a dual-

Details Tone-detection method for detecting at least one tone in a dual- Tone-detection method for detecting at least one tone in a dual-

1994-02-28

1996-02-27

Hofsass, Jeffery A.

Telephonic communications

Supervisory or control line signaling

Signal receiver

379351, 379282, 379283, H04M 100

Patent

active

054955262

ABSTRACT:
A method for detecting the presence of single tone and dual tone signals compares a ratio r which equals the square of the maximum value of the received signal (A max) during a sampling period divided by a measure E of the energy to three different thresholds. If r is less than the first threshold (3) a single tone is indicated. If it is greater than the first but less than the second (5.2) a dual tone is indicated. When a single tone is indicated the received signal is subjected to a second order autoregressive process to determine the frequency of the single tone. If a dual tone is indicated the received signal is subjected to a fourth order autoregressive process to determine the frequencies of the dual tones.

REFERENCES:
patent: 4042788 (1977-08-01), Richards
patent: 4667065 (1987-05-01), Bangerter
patent: 4979214 (1990-12-01), Hamilton
patent: 5307404 (1994-04-01), Yatsunami
patent: 5321745 (1994-06-01), Drory et al.
patent: 5325425 (1994-06-01), Novas et al.
27th Midwest Symposium on Circuits and Systems pp. 258-260.

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