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International Journal of Scientific and Engineering Research
ISSN Online 2229-5518
ISSN Print: 2229-5518 1    
Website: http://www.ijser.org
scirp IJSER >> Volume 3,Issue 1,January 2012
An Automatic Voice-Controlled Audio Amplifie
Full Text(PDF, )  PP.274-279  
Author(s)
Jonathan A. Enokela and Jonathan U. Agber
KEYWORDS
Audio Amplifier, Electronic Control, Attenuation, Voice Control, Public Address System, Audio Fading
ABSTRACT
The delivery of the proper quality of audio signals to the audience in the entertainment, public and other environments is of great, and sometimes critical, importance. This always requires that the audio signals be of the correct intensity to the hearing of the audience, especially if the signals come from different sources. This work presents a system which automatically fades out the main stream signal when signals from other sources are received. By arranging the circuit such that the signal from the other sources continuously drives a pair of bipolar junction transistors towards heavier saturation, the mainstream signal was attenuated by as much as 3 dB
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