Speech Denoising Based on Estimating Sound Source Direction for Car Navigation System

• Project/Area Number: 17500111
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Perception information processing/Intelligent robotics
• Research Institution: Tottori University
• Principal Investigator: SHIMIZU Tadaaki Tottori University, Faculty of Engineering, associate professor (80196518)
• Project Period (FY): 2005 – 2007
• Project Status: Completed (Fiscal Year 2007)
• Budget Amount: ¥3,240,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥240,000); Fiscal Year 2007: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2006: ¥1,100,000 (Direct Cost: ¥1,100,000); Fiscal Year 2005: ¥1,100,000 (Direct Cost: ¥1,100,000)
• Keywords: Speech Denoising / Speech Signal / Direction-of-arrival estimation / Spectrum Subtraction / Digital Signal Processor / 雑音除去

Research Abstract

We carried out research and development regarding a speech denoising method for a small device such as a car navigation system. Our method has been developed based on 1) estimating sound source direction and 2) spectrum subtraction.
1) We have developed a method of estimating multiple sound source directions from signals received by two microphones. In this method, estimation of sound source directions is performed by classifying spectrum components of speech signal using its harmonic structure. The technique of vector quantization is used for the classification of spectrum components. The evaluation experiment for our method by the simulation was performed about two sound sources (speakers).The simulation results reveal that the proposed method attained 83% of rate of a correct estimation int the accuracy of less than 5 degree.
2) We proposed the improved spectrum subtraction method with two microphones. This method can reduce unstationary noise such as the road noise. We carried out implementation experiment of this method on the digital signal processor (C6713DSK).

Research Products

• [Presentation] Hardware Realization of Panoramic Camera with Direction of Speaker Estimation and a Panoramic Image Generation Function (2007)
  • Author(s): TORU UESUGI
  • Organizer: 7th WSEAS International Conference on Simulation, Modelling and Optimization
  • Place of Presentation: Beijing Jiaotong University
  • Year and Date: 2007-09-15
  • Description: 「研究成果報告書概要(和文)」より
• [Presentation] 2入力スペクトル・サブトラクション法のDSPへの実装 (2006)
  • Author(s): 清水忠昭
  • Organizer: 平成18年度電気・情報関連学会中国支部第57回連合大会
  • Place of Presentation: 岡山理科大学
  • Year and Date: 2006-10-21
  • Description: 「研究成果報告書概要(和文)」より
• [Presentation] Hardware Realization of 2-Input Spectrum Subtraction Method on DSP (2006)
  • Author(s): TADAAKI, SHIMIZU
  • Organizer: 57th Annual Meeting of the Liaison Council of Institues for Electrical Information, and Communication Engineers (chugoku chapter)
  • Place of Presentation: Okayama University of Science
  • Year and Date: 2006-10-21
  • Description: 「研究成果報告書概要(欧文)」より