Voice activity detection method and apparatus using the same

Telephonic communications – Supervisory or control line signaling – Signal receiver

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Voice activity detection method and apparatus using the same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Voice activity detection method and apparatus using the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Voice activity detection method and apparatus using the same will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1513913

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.