Towards undistorted and noise-free speech in an MRI scanner: correlation subtraction followed by spectral noise gating

Noise cancellation in an MRI environment is difficult due to the high noise levels that are in the spectral range of human speech. This paper describes a two-step method to cancel MRI noise that combines operations in both the time domain (correlation subtraction) and the frequency domain (spectral...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2014-03, Vol.135 (3), p.1019-1022
Main Authors: Inouye, Joshua M, Blemker, Silvia S, Inouye, David I
Format: Article
Language:English
Subjects:
Acoustics
Algorithms
Equipment Design
Humans
Larynx - anatomy & histology
Larynx - physiology
Magnetic Resonance Imaging - instrumentation
Noise - adverse effects
Noise - prevention & control
Perceptual Masking
Signal Processing, Computer-Assisted
Software
Sound Spectrography
Speech Acoustics
Speech Intelligibility
Speech Perception
Speech Production Measurement
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Summary:Noise cancellation in an MRI environment is difficult due to the high noise levels that are in the spectral range of human speech. This paper describes a two-step method to cancel MRI noise that combines operations in both the time domain (correlation subtraction) and the frequency domain (spectral noise gating). The resulting filtered recording has a noise power suppression of over 100 dB, a significant improvement over previously described techniques on MRI noise cancellation. The distortion is lower and the noise suppression higher than using spectral noise gating in isolation. Implementation of this method will aid in detailed studies of speech in relation to vocal tract and velopharyngeal function.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.4864482