Real Time Noise Canceling by Bandpass Filter.

Abstract

In this paper we describe a hardware system based on a channel vocoder for reducing, in real time, noises superimposed on speech. Furthermore, we describe two algorithms to be performed on the hardware system for reducing classical random noises and acoustic pulsive noises with resonances and long duration such as a telephone bell. Noises in environments degrade the quality of speech so that reduction of noises from noisy speech is essentially required for speech communication by telephone line or for speech recognition by a computer. From the view point of speech communication, we developed the noise reduction hardware system and two algorithms which are performed, in real time, for several kinds of noises including random noises.