The handsfree mode is convenient when using a mobile phone in a vehicle. This mode brings the microphone away from the talkers mouth. As a consequence the speech signal picked up has low Signal to Noise Ratio. Thus, to improve the SNR a noise reduction method is employed. The proposed method is an improvement of the well-known spectral subtraction method which uses one SNR-depen-dent gain function to suppress the noise. The proposed method reduces the residual noise artifacts by using an adaptive averaging of the gain function. The adaptation is controlled by a spectral discrepancy measure, which is obtained by comparing the averaged noise spectrum and the current input signal spectrum. Experiments show a noise reduction of 10 dB with good noise quality and sig-nificantly low residual noise distortion. Sound results are presented athttp://www.its.hk-r.se/research.
Cite as: Gustafsson, H., Nordholm, S., Claesson, I. (1999) Spectral subtraction with adaptive averaging of the gain function. Proc. 6th European Conference on Speech Communication and Technology (Eurospeech 1999), 2599-2602, doi: 10.21437/Eurospeech.1999-572
@inproceedings{gustafsson99_eurospeech,
author={Harald Gustafsson and Sven Nordholm and Ingvar Claesson},
title={{Spectral subtraction with adaptive averaging of the gain function}},
year=1999,
booktitle={Proc. 6th European Conference on Speech Communication and Technology (Eurospeech 1999)},
pages={2599--2602},
doi={10.21437/Eurospeech.1999-572}
}