Neural Kalman Filter Application to Speech Enhancement
Subject Areas : Electrical Engineering
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Keywords: Speech Enhancement, Extended Kalman Filter, Neural Network.,
Abstract :
Speech enhancement is introduced as a requirement to increase the quality of communication systems' operations. There is a broad range of improvements for speech recognition systems in aviation, military, telecommunication, and cellular environments. Also, speech quality confirmation can be important in decrement of audience boredom in noisy environments. In this paper, speech quality enhancement and its intelligibility by extended Kalman filter is introduced. It is obvious that for speech detection the right estimation is needed, but an important subject is that the linear filter is unable to estimate nonlinear systems while most real systems like voice systems have nonlinear architecture. Hence, according to the extended Kalman filter method, modelling and estimation of voice signal with nonlinearity assumption that leads to speech enhancement, is executed and its results are shown.
Since 1960 the Kalman filter was introduced, always researchers tried to use this filter for linear systems dynamics estimation, however, the main problem was that most real systems have nonlinear architecture while the linear Kalman filter is unable to estimate those systems. For instance, voice systems are nonlinear systems that because of voice nonlinearity architecture and linear Kalman filter restriction could not be estimated until an extended Kalman filter was introduced.
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