Research Information :

[Current Project | Research Areas of Interest | Projects and Grants]

 

 

Current Project:

Noise Reduction techniques for digital hearing aids

Examples of speech files (DARPA TIMIT)
(these signals are relevant to a paper on "A hybrid structure for noise reduction technique in digital hearing aids" submitted to EURASIP Journal on Advances in Signal Processing, June 2012)

- A clean speech signal (fs = 8kHz) (download)
- Noisy speech signal (WGN, input SNR=10dB) (download)
- Noisy speech signal (babble noise, input SNR=10dB) (download)

Case 1 : Enhanced speech signals, when the additive noise is WGN, input SNR=10dB
- Enhanced speech signal using the Power Spectral Subtraction (PSS) method, fixed alpha (noise subtraction parameter) (download)
- Enhanced speech signal using the Power Spectral Subtraction (PSS) method, variable alpha (proposed scheme for noise subtraction parameter) (download)
- Enhanced speech signal using the Modified Cross Spectral Subtraction (MCSS) method (download)
- Enhanced speech signal using the proposed hybrid method with variable alpha (proposed scheme for noise subtraction parameter) (download)

Case 2 : Enhanced speech signals, when the additive noise is babble noise, input SNR=10dB
- Enhanced speech signal using the Power Spectral Subtraction (PSS) method, fixed alpha (noise subtraction parameter) (download)
- Enhanced speech signal using the Power Spectral Subtraction (PSS) method, variable alpha (proposed scheme for noise subtraction parameter) (download)
- Enhanced speech signal using the Modified Cross Spectral Subtraction (MCSS) method (download)
- Enhanced speech signal using the proposed hybrid method with variable alpha (proposed scheme for noise subtraction parameter) (download)

 

Research Areas:

  • Adaptive Filter and its applications
    • Mono-channel Acoustic Echo Cancellation (AEC) / Stereophonic Acoustic Echo Cancellation (SAEC) in Hands-Free Communication Systems
    • Acoustic Feedback Cancellation (AFC) in Hearing-Aid Devices
  • Digital Signal Processing (DSP) and its applications for telecommunications
    • Subband Processing in AEC / SAEC systems
    • Multi-band Compression in Hearing-Aid Devices
  • Speech Enhancement Techniques
    • Adaptive Noise Cancellation (ANC)
    • Noise Reduction (NR) techniques
    • Acoustic Echo and Noise Suppression (AENS) techniques

 

Research Grants :

 

 

  •  

 

Project

Noise reduction techniques for digital hearing aids (Year II)

 

Role

Project Director & Researcher

 

Budget

252,975 baht

 

Agency

AUN/SEED-Net

 

Duration

April 2009 - March 2010

 


 

  •  

 

Project

Noise reduction techniques for digital hearing aids

 

Role

Project Director & Researcher

 

Budget

84,333 baht

 

Agency

AUN/SEED-Net

 

Duration

October 2008 - March 2009

 


 

  •  

 

Project

 

Industrial Linkage for Research and Development Year V (ILRD V)

Sub-project : Achieving high subjective voice quality in Voice over "X"-networks (Phase III)

 

Role

Project Director & Researcher

 

Budget

700,000 baht

 

Agency

Government

 

Duration

June 2006 - May 2007


 

  •  

 

Project

 

On the improvement of Loudness Recruitment in Hearing Aids using Non-linear Compression

 

Role

Project Director & Researcher

 

Budget

212,000 baht

 

Agency

Ratchadapiseksompoj Endowment, Chulalongkorn University

 

Duration

October 2005 - September 2006


 

  •  

 

Project

 

Industrial Linkage for Research and Development Year IV (ILRD IV)

Sub-project : Achieving high subjective voice quality in Voice over "X"-networks (Phase II)

 

Role

Project Director & Researcher

 

Budget

600,000 baht

 

Agency

Government

 

Duration

June 2005 - May 2006


 

  •  

 

Project

 

Industrial Linkage for Research and Development Year III (ILRD III)

Sub-project : Achieving high subjective voice quality in Voice over "X"-networks

 

Role

Project Director & Researcher

 

Budget

550,000 baht

 

Agency

Government

 

Duration

June 2004 - May 2005


 

  •  

 

Project

Feasibility Study on Power Line Communication (PLC)

 

Role

Coordinator & Researcher

 

Budget

3,000,000 baht

 

Agency

Metropolitan Electricity Authority of Thailand (MEA)

 

Duration

March - September 2004


 

  •  

 

Project

eLearning Development

 

Role

Researcher

 

Budget

1,000,000 baht

 

Agency

House of Parliament

 

Duration

September - December 2003


 

  •  

Project

On the improvement of acoustic feedback cancellation in hearing-aid devices for enhanced dynamic range

 

Role

Project Director & Researcher

 

Budget

173,000 baht

 

Agency

Ratchadapiseksompoj Endowment, Chulalongkorn University

 

Duration

August 2003 - July 2004


 

  •  

 

Project

 

Industrial Linkage for Research and Development Year II (ILRD II)

Sub-project : Stereophonic Acoustic Echo Cancellation in the Double-Talk Situation (Phase II)

 

Role

Project Director & Researcher

Budget

388,000 baht

Agency

Government

Duration

June 2003 - May 2004


 

  •  

Project

Thai Text-to-Speech (TTS) and Thai Automatic Word Recognition (AWR) for Sun IVR Systems

 

Role

Researcher

 

Budget

5,922,450 baht (AWR : 2,465,000 baht)

 

Agency

Sun System (Thailand) Co. Ltd.

 

Duration

January 2003 - December 2003


 

  •  

Project

Study of the Stereophonic Acoustic Echo Cancellation in the Double-Talk Situation

 

Role

Project Director & Researcher

 

Budget

200,000 baht

 

Agency

Grants for development of new faculty staff, Ratchadapiseksompoj Endowment, Chulalongkorn University

 

Duration

October 2002 - September 2004


 

  •  

Project

 

Industrial Linkage for Research and Development Year I (ILRD I)

Sub-project : Stereophonic Acoustic Echo Cancellation in the Double-Talk Situation

 

Role

Project Director & Researcher

 

Budget

213,811.80 baht

 

Agency

Government

 

Duration

June 2002 - May 2003


 

 

Research Information :

[Research Areas of Interest | Projects and Grants]

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