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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

slide2

Background & Purpose

  • What is reverberation?
  • Why study dereverberation?
  • Purpose: A method to reduce or possibly remove reverberation from the audio signal
slide3

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
slide5

Naka03 (cont.)

  • Naka 03
  • Legends:
  • Thin: Impulse response
  • Thick dashed line: male
  • Thick solid line: female
slide6

Naka04

x(t) = observed signal

F = Adaptive Harmonic Filter

w(t) = Dereverberation Filter

slide8

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
slide9

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?
slide10

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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