A Psychoacoustic Noise Reduction Approach for Stereo Hands-Free Systems

New optimal filtering approaches for hands-free telecommunication terminals

The use of Wiener filtering to simultaneously reduce all the perturbations at the sound pick-up of hands-free terminals is investigated in this paper. This analysis of perturbation reduction is a global approach as all types of perturbations to desired signal are reduced by a unique filter. Filters derived from this approach are applied in two different contexts: hands-free radiotelephony in ca...

A psychoacoustic approach to combined acoustic echo cancellation and noise reduction

This paper presents and compares algorithms for combined acoustic echo cancellation and noise reduction for hands-free telephones. A structure is proposed, consisting of a conventional acoustic echo canceler and a frequency domain postfilter in the sending path of the hands-free system. The postfilter applies the spectral weighting technique and attenuates both the background noise and the resi...

Multichannel Dereverberation and Noise Reduction for Hands-Free Speech Communication Systems

Noise robust hands-free speech recognition using microphone array and Kalman filter as front-end system of conversational TV

In this paper, we investigate hands-free speech recognition as front-end system of conversational TV. The conversational TV is one of machine conversation systems to retrieve the interesting information by inquiring it to the TV. To realize the natural machine conversation without consciousness of microphone, hands-free speech recognition is required. In the handsfree speech recognition system,...

On integrating acoustic echo and noise cancellation systems for hands-free telephony

An integrated acoustic echo and noise cancellation system for hands-free telephony is presented. The proposed system includes a new residual echo cancellation scheme based on spectral analysis and a new double-talk detector suitable for real-time implementation. Residual echo is whitened via AR analysis during no near-end-talk period and is cancelled by noise reduction. Removing speech characte...