Voice activity detection method and apparatus using the same

Details Voice activity detection method and apparatus using the same Voice activity detection method and apparatus using the same

1994-02-28

1996-07-02

Hofsass, Jeffery

Telephonic communications

Supervisory or control line signaling

Signal receiver

379351, 379282, 379283, 379 80, H04M 100

Patent

active

055331181

ABSTRACT:
A method for detecting the presence of voice, 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. If it is greater than the second, the received signal level is compared to the third threshold (-43 dB) and receipt of a voice signal is indicated if the level of the received signal exceeds this threshold.

REFERENCES:
patent: 4042788 (1977-08-01), Richards
patent: 4667065 (1987-05-01), Bangerter
patent: 4764966 (1988-08-01), Einkauf et al.
patent: 4979214 (1990-12-01), Hamilton
patent: 5321475 (1994-06-01), Drory et al.
patent: 5325425 (1994-06-01), Novas et al.
27th Midwest Symposium on Circuits and Systems pp. 258-260.
Globecom, vol. 3, Nov. 28, 1988 pp. 1419-1427. A DSP Implemented Speech/Voiceband Data Discriminator, para. 3.1.

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