Browse Prior Art Database

ACOUSTIC PROXIMITY DETECTION VOX EMPLOYING TWO MICROPHONES

IP.com Disclosure Number: IPCOM000007432D
Original Publication Date: 1995-Jul-01
Included in the Prior Art Database: 2002-Mar-26
Document File: 2 page(s) / 134K

Publishing Venue

Motorola

Related People

Authors:
Clint Luckinbill

Abstract

The VOX described here is an audio proximity detector. Applications for the VOX are envisioned as supportive of portable radio communications. Two microphones are utilized. The 1st is placed next to the VOX operator's mouth to capture his voice and the 2nd placed away from his mouth to capture back- ground noise. Differences in the microphone sig- nals are used to discern when the VOX operator is talking. Environments benelitting from this design are those incorporating human voices in the back- ground noise. Imagine the difficulty in getting a nor- mal VOX to operate a portable radio at the ball park. A noisy environment filled with loud voices makes it difficult to discern the operator's voice from the background. The VOX described here has no difft- culty in these environments as it discerns ambient sounds as distant relative to the operator mouth.