TY - GEN
T1 - Enhancement of Non-Stationary Speech using Harmonic Chirp Filters
AU - Nørholm, Sidsel Marie
AU - Jensen, Jesper Rindom
AU - Christensen, Mads Græsbøll
PY - 2015
Y1 - 2015
N2 - In this paper, the issue of single channel speech enhancement of non-stationary voiced speech is addressed. The non-stationarity of speech is well known, but state of the art speech enhancement methods assume stationarity within frames of 20–30 ms. We derive optimal distortionless filters that take the non-stationarity nature of voiced speech into account via linear constraints. This is facilitated by imposing a harmonic chirp model on the speech signal. As an implicit part of the filter design, the noise statistics are also estimated based on the observed signal and parameters of the harmonic chirp model. Simulations on real speech show that the chirp based filters perform better than their harmonic counterparts. Further, it is seen that the gain of using the chirp model increases when the estimated chirp parameter is big corresponding to periods in the signal where the instantaneous fundamental frequency changes fast.
AB - In this paper, the issue of single channel speech enhancement of non-stationary voiced speech is addressed. The non-stationarity of speech is well known, but state of the art speech enhancement methods assume stationarity within frames of 20–30 ms. We derive optimal distortionless filters that take the non-stationarity nature of voiced speech into account via linear constraints. This is facilitated by imposing a harmonic chirp model on the speech signal. As an implicit part of the filter design, the noise statistics are also estimated based on the observed signal and parameters of the harmonic chirp model. Simulations on real speech show that the chirp based filters perform better than their harmonic counterparts. Further, it is seen that the gain of using the chirp model increases when the estimated chirp parameter is big corresponding to periods in the signal where the instantaneous fundamental frequency changes fast.
KW - speech enhancement, single-channel, non-stationary signals, harmonic chirp model
UR - http://interspeech2015.org//wp-content/uploads/direct/INTERSPEECH_2015_AbstractBook.pdf
UR - http://www.isca-speech.org/archive/interspeech_2015/
M3 - Article in proceeding
T3 - INTERSPEECH
SP - 1755
EP - 1759
BT - INTERSPEECH 2015
PB - International Speech Communications Association
T2 - INTERSPEECH 2015 16th Annual Conference of the International Speech Communication Association
Y2 - 6 September 2015 through 10 September 2015
ER -