Dereverberation technique with linear predictive modeling and inverse filtering
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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

Dereverberation Technique with Linear Predictive Modeling and Inverse Filtering

E6820 – Speech/Audio Processing

Spring 2005

Victor Sutan


Dereverberation technique with linear predictive modeling and inverse filtering

Background & Purpose and Inverse Filtering

  • What is reverberation?

  • Why study dereverberation?

  • Purpose: A method to reduce or possibly remove reverberation from the audio signal


Dereverberation technique with linear predictive modeling and inverse filtering

Solutions and Inverse Filtering

  • 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


Dereverberation technique with linear predictive modeling and inverse filtering

Naka03 and Inverse Filtering


Dereverberation technique with linear predictive modeling and inverse filtering

Naka03 (cont.) and Inverse Filtering

  • Naka 03

  • Legends:

  • Thin: Impulse response

  • Thick dashed line: male

  • Thick solid line: female


Dereverberation technique with linear predictive modeling and inverse filtering

Naka04 and Inverse Filtering

x(t) = observed signal

F = Adaptive Harmonic Filter

w(t) = Dereverberation Filter


Dereverberation technique with linear predictive modeling and inverse filtering

Naka 04 (cont.) and Inverse Filtering


Dereverberation technique with linear predictive modeling and inverse filtering

Ellis 05 and Inverse Filtering

  • 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


Dereverberation technique with linear predictive modeling and inverse filtering

Next Steps and Inverse Filtering

  • 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?


Dereverberation technique with linear predictive modeling and inverse filtering

References and Inverse Filtering

  • 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.