<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>The paper presents two methods of noise reduction of speech signal recorded in an MRI device during phonation for the human vocal tract modelling. The applied approach of noise speech signal cleaning is based on cepstral speech analysis and synthesis because the noise is mainly produced by gradient coils, has a mechanical character, and can be processed in spectral domain. Our first noise reduction method is using real cepstrum limitation and clipping the "peaks" corresponding to the harmonic frequencies of mechanical noise. The second method is coming out from substation of the short-time spectra of two signals recorded withal: the first includes speech and noise, and the second consists of noise only. The resulting speech quality was compared by spectrogram and mean periodogram methods.</p></abstract>

The paper presents two methods of noise reduction of speech signal recorded in an MRI device during phonation for the human vocal tract modelling. The applied approach of noise speech signal cleaning is based on cepstral speech analysis and synthesis because the noise is mainly produced by gradient coils, has a mechanical character, and can be processed in spectral domain. Our first noise reduction method is using real cepstrum limitation and clipping the "peaks" corresponding to the harmonic frequencies of mechanical noise. The second method is coming out from substation of the short-time spectra of two signals recorded withal: the first includes speech and noise, and the second consists of noise only. The resulting speech quality was compared by spectrogram and mean periodogram methods.

Two Methods of Mechanical Noise Reduction of Recorded Speech During Phonation in an MRI device

Institute of Measurement Science, SAS, Dúbravská cesta 9, SK-841 04 Bratislava, Slovakia

Institute of Thermomechanics, AS CR, v.v.i., Dolejškova 5, CZ-182 00 Prague, Czech Republic

Institute of Photonics and Electronics, AS CR, v.v.i., Chaberská 57, CZ-182 51 Prague, Czech Republic

Measurement Science Review

The paper presents two methods of noise reduction of speech signal recorded in an MRI device during phonation for the human vocal tract modelling. The applied...

Two Methods of Mechanical Noise Reduction of Recorded Speech During Phonation in an MRI device

Published Online: Aug 12, 2011

Page range: 92 - 98

DOI: https://doi.org/10.2478/v10048-011-0017-y

Keywords
speech processing, noise reduction, NMR imaging

This content is open access.

Two Methods of Mechanical Noise Reduction of Recorded Speech During Phonation in an MRI device

Published Online: Aug 12, 2011

Page range: 92 - 98

DOI: https://doi.org/10.2478/v10048-011-0017-y

Keywordsspeech processing, noise reduction, NMR imaging

This content is open access.

Keywords
speech processing, noise reduction, NMR imaging