VOX discrimination device

Details VOX discrimination device VOX discrimination device

1996-11-01

1998-10-13

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704214, G10L 500

Patent

active

058227253

ABSTRACT:
In a radio communication system such as a digital automobile telephone, a VOX controller stops a transmission of a frame having no voice data to perform power savings, and a VOX device discriminates whether the voice data are present or absent in each frame. In a reference power measuring circuit, all or selected pilot signals of a received frame are oppositely rotated using theoretical values of the pilot signals to uniform their phases, and in-phase vector synthesis is conducted. The vector synthesis result is averaged by the number of the synthesis symbols, and an absolute value of the averaged vector value becomes the desired signal reference power X. In a fading compensation circuit, by using the previous and next pilot signals of a data part, each fading vector is calculated. In a power measuring circuit, the data upon which the fading compensation has been conducted are oppositely rotated to uniform their phases, and in-phase vector synthesis is carried out. The vector synthesis result is averaged by the number of the synthesis symbols, and an absolute value of the averaged vector value become a received signal power Y. In a discrimination circuit, the desired signal reference power X and the received signal power Y are compared with each other to carry out a VOX discrimination.

REFERENCES:
patent: 5012519 (1991-04-01), Adlersberg et al.
patent: 5509102 (1996-04-01), Sasaki
patent: 5596608 (1997-01-01), Sassa et al.

Affiliated with

Also associated with

Rating

VOX discrimination device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with VOX discrimination device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and VOX discrimination device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-326840