Spectral Subtraction for Speech Enhancement in Modulation Domain
In this paper, an enhancement method is proposed for a speech signal that is corrupted by background noise. The proposed method is based on the spectral subtraction technique. The conventional spectral subtraction method improves the quality of the signal by reducing noise but it introduces an annoying musical noise. To eliminate the musical noise, spectral subtraction method in modulation domain is proposed. A filter bank, the heart of modulation domain, splits the broadband signal into several sub-bands. Then Instantaneous Frequency (IF) carrier estimator technique is used to estimate the carrier and modulating signal of each sub-band. Implementing spectral subtraction on each modulating signal and by synthesizing signals at the output, we get the enhanced speech signal without musical noise. Both qualitative (listening tests) quantitative tests were performed to determinate the intelligibility and quality of speech enhanced by the proposed method.
Keywords: Speech Enhancement, Spectral Subtraction, Modulation domain, Noise Removal
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ABOUT THE AUTHORS
Muhammad Tariq Sadiq
Muhammad Tariq Sadiq was born in Lahore, Pakistan, in 1985. He recieved his BS Electrical Engineering degree from COMSATS Institute of Information Technology (CIIT), Lahore, Pakistan, in 2009 and MS Electrical Engineering degree from Blekinge Institute of Technology, Sweden in 2011. He is currently working as a Lecturer & Project Manager in the Dept. of Electrical Engineering., Sharif College of Engineering & Technology (Affiliated with UET Lahore) Lahore, Pakistan. His research interests are in the field of cognitive radio, speech processing and wireless networks
Noman Shabbir
Noman Shabbir was born in Lahore, Pakistan in 1985. He got his BS Computer Engineering degree from COMSATS Institute of Information Technology (CIIT), Lahore, Pakistan, in 2007 and MS Electrical Engineering (Radio Comm.) degree from Blekinge Institute of Technology, Sweden in 2009. His project on Unmanned Arial Vehicles (UAV) got 3rd position in a National competition in 2006. He is currently working as a lecturer in the Dept of Electrical Engineering., GC University, Lahore, Pakistan. His research interests are in the field of wireless networks and computer networks.
Wlodek J. Kulesza
Wlodek J. Kulesza received the M.Sc. and the Ph.D. degrees from Lodz University of Technology, Poland, and a docent degree from Linkoping University, Sweden. In 2001 he became Professor in Measurement Science at the University of Kalmar, Sweden. Since 2005 he has held a Professor position at the School of Engineering in the Blekinge Institute of Technology (BTH), Karlskrona, Sweden. His current research interests are multi-sensor systems and wireless sensor networks. IEEE member since 1995.
Muhammad Tariq Sadiq
Muhammad Tariq Sadiq was born in Lahore, Pakistan, in 1985. He recieved his BS Electrical Engineering degree from COMSATS Institute of Information Technology (CIIT), Lahore, Pakistan, in 2009 and MS Electrical Engineering degree from Blekinge Institute of Technology, Sweden in 2011. He is currently working as a Lecturer & Project Manager in the Dept. of Electrical Engineering., Sharif College of Engineering & Technology (Affiliated with UET Lahore) Lahore, Pakistan. His research interests are in the field of cognitive radio, speech processing and wireless networks
Noman Shabbir
Noman Shabbir was born in Lahore, Pakistan in 1985. He got his BS Computer Engineering degree from COMSATS Institute of Information Technology (CIIT), Lahore, Pakistan, in 2007 and MS Electrical Engineering (Radio Comm.) degree from Blekinge Institute of Technology, Sweden in 2009. His project on Unmanned Arial Vehicles (UAV) got 3rd position in a National competition in 2006. He is currently working as a lecturer in the Dept of Electrical Engineering., GC University, Lahore, Pakistan. His research interests are in the field of wireless networks and computer networks.
Wlodek J. Kulesza
Wlodek J. Kulesza received the M.Sc. and the Ph.D. degrees from Lodz University of Technology, Poland, and a docent degree from Linkoping University, Sweden. In 2001 he became Professor in Measurement Science at the University of Kalmar, Sweden. Since 2005 he has held a Professor position at the School of Engineering in the Blekinge Institute of Technology (BTH), Karlskrona, Sweden. His current research interests are multi-sensor systems and wireless sensor networks. IEEE member since 1995.
