Loading in 5 sec....

Dereverberation Technique with Linear Predictive Modeling and Inverse FilteringPowerPoint Presentation

Dereverberation Technique with Linear Predictive Modeling and Inverse Filtering

- 137 Views
- Uploaded on

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

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.

Download Presentation

Connecting to Server..