20-kHz frequency-range acoustic echo canceller for high-quality TV conferencing

This paper presents an overview of a new sub-band acoustic echo canceller for the 100 Hz–20 kHz frequency band that we have developed. It consists mainly of adaptive digital filter and echo reduction processes to eliminate an echo signal. The experimental results indicate that the new echo canceller suppresses the echo signal at least over 35 dB and delivers natural near-end speech sound even during double-talk situations.