Bibliografické údaje¶
| Název | Two Methods of Mechanical Noise Reduction of Recorded Speech During Phonation in an MRI Device |
| Autor | Přibil, J., Horáček, J., Horák, P. |
| Typ publikace | Článek v časopise, odborném periodiku |
| Periodikum | Measurement Science Review |
| Nakladatel | Journal of the Institute of Measurement Science SAS (on-line edition)/ Versita - Central European Science Publisher |
| Svazek | 11 |
| Číslo | 3 |
| Strana | 92-98 |
| Rok | 2011 |
| ISSN | 1335-8871 (elektronická verze) |
Abstrakt¶
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.