access icon free Speech enhancement based on modulation domain processing using coherent harmonic demodulation technique

This Letter presents a single-channel speech enhancement technique based on modulation domain signal processing. In the proposed approach, noise-dominant low-frequency (4–16 Hz) temporal modulation envelopes are discarded based on the modulation domain a priori signal-to-noise ratio criterion. Moreover, the authors have employed coherent harmonic demodulation method which ensures distortion-free filtering of modulators. The experiment results in various acoustic non-stationary noise scenario show that the proposed approach can significantly improve the speech quality and intelligibility while compared to the other existing state-of-the-art baseline techniques.

Inspec keywords: filtering theory; demodulation; modulation; speech enhancement

Other keywords: speech intelligibility; frequency 4 Hz to 16 Hz; coherent harmonic demodulation technique; modulation domain a priori signal-to-noise ratio criterion; noise-dominant low-frequency temporal modulation envelopes; speech modulations; speech quality; single-channel speech enhancement technique; distortion-free filtering; modulation domain signal processing; noncoherent Hilbert envelope; acoustic nonstationary noise scenario

Subjects: Speech processing techniques; Speech and audio signal processing; Filtering methods in signal processing

References

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      • 3. Paliwal, K., Schwerin, B., Wojcicki, K.: ‘Single channel speech enhancement using MMSE estimation of short-time modulation magnitude spectrum’, Interspeech, Florence, Italy, August 2011, pp. 12091212.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2017.2857
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