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A Speech Enhancement Technique Using Kalman Filter with State Vector of Time-Frequency Patterns
Ryouichi NISHIMURA Futoshi ASANO Yoiti SUZUKI Toshio SONE
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/04/01
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Acoustic Signal Processing)
speech enhancement, Kalman filter, wavelet transform, time-frequency pattern,
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A new speech enhancement technique is proposed assuming that a speech signal is represented in terms of a linear probabilistic process and that a noise signal is represented in terms of a stationary random process. Since the target signal, i.e., speech, cannot be represented by a stationary random process, a Wiener filter does not yield an optimum solution to this problem regarding the minimum mean variance. Instead, a Kalman filter may provide a suitable solution in this case. In the Kalman filter, a signal is represented as a sequence of varying state vectors, and the transition is dominated by transition matrices. Our proposal is to construct the state vectors as well as the transition matrices based on time-frequency pattern of signals calculated by a wavelet transformation (WT). Computer simulations verify that the proposed technique has a high potential to suppress noise signals.