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Dereverberation Technique with Linear Predictive Modeling and Inverse Filtering

Dereverberation Technique with Linear Predictive Modeling and Inverse Filtering. E6820 – Speech/Audio Processing Spring 2005 Victor Sutan. Background & Purpose. What is reverberation? Why study dereverberation?

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Dereverberation Technique with Linear Predictive Modeling and Inverse Filtering

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  1. Dereverberation Technique with Linear Predictive Modeling and Inverse Filtering E6820 – Speech/Audio Processing Spring 2005 Victor Sutan

  2. Background & Purpose • What is reverberation? • Why study dereverberation? • Purpose: A method to reduce or possibly remove reverberation from the audio signal

  3. Solutions • Existing methods • Multi-microphones: beam-forming, inverse filtering • Single-microphone: Cepstrum based, Linear regression • Nakatani • Single Channel Speech based on Harmonic Structure (Naka 03) • Blind Dereverberation with Time Warping (Naka 04) • Proposed Solution • Dereverberation with LPC and Inverse Filtering

  4. Naka03

  5. Naka03 (cont.) • Naka 03 • Legends: • Thin: Impulse response • Thick dashed line: male • Thick solid line: female

  6. Naka04 x(t) = observed signal F = Adaptive Harmonic Filter w(t) = Dereverberation Filter

  7. Naka 04 (cont.)

  8. Ellis 05 • Separate Reverberated Resonances with LPC models • High Level LPC models to capture spectral structures • Look for repeating pole for every frame. • Could be from reverberation • Inverse Filtering to dereverb

  9. Next Steps • Investigate proposed solution • LPC Model • Inverse Filter • Can Nakatani’s be improved for male speech? • What will happen to Nakatani’s if Reverberation Time is more than 1 sec?

  10. References • Nakatani, T., Kinoshita, K., Miyoshi, M., Zolfaghari, P.S. Harmonicity Based Blind Dereverberation with Time Warping. Proc. ISCA Tutorial and Research Workshop on Statistical and Perceptual Audio Processing (SAPA), Oct., 2004. • Nakatani, T., and Miyoshi, M., Blind Dereverberation of Single Channel Speech Signal based on Harmonic Structure, ICASSP-2003, vol.1, pp. 92-95, Apr., 2003.

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