Dereverberation technique with linear predictive modeling and inverse filtering
Download
1 / 10

Dereverberation Technique with Linear Predictive Modeling and Inverse Filtering - PowerPoint PPT Presentation


  • 137 Views
  • Uploaded on

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?

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Dereverberation Technique with Linear Predictive Modeling and Inverse Filtering' - sharla


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
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 and Inverse Filtering

  • What is reverberation?

  • Why study dereverberation?

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


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


Naka03 and Inverse Filtering


Naka03 (cont.) and Inverse Filtering

  • Naka 03

  • Legends:

  • Thin: Impulse response

  • Thick dashed line: male

  • Thick solid line: female


Naka04 and Inverse Filtering

x(t) = observed signal

F = Adaptive Harmonic Filter

w(t) = Dereverberation Filter


Naka 04 (cont.) 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


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?


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.


ad