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International Journal of Information Technology & Computer Science ( IJITCS )

Abstract :

This paper presents howling detection method in two-way hands-free communication system.  Though hands-free communication is convenient for multi-user system such as audio/video conference, it is very common for the open microphones and loudspeakers produce acoustic feedback in a closed loop, which results in howling. This obviously prevents any useful conversation between participants.  
In this paper we propose a real time howling detection method based on the long-term average spectral power and howling information of the previous frame.  Performance tests show that the proposed algorithm provides quick and stable howling detection results.

Keywords :

: howling detecion; howling suppression; hands-free video conferencing

References :

  1. Senthil Kumar Mani and Sowmya Mannava, “Robust and High quality Howling Suppression for Real Time Hands-Free Communication systems”, IEEE 2011 
  2. Franck Beaucoup, “ A Novel Loop Stabilisation Technique for Full-Duplex Speakerphones”, IEEE CCECE/CCGEI, May, 2006, pp.771-774. 
  3. T.van Waterschoot and M.Moonen, “comparative spectral analysis of howling detection criteriia in notch filter based howling suppression”. AES 126th conv., Munich, Germany, May, 2009
  4. ITU-T Recommendation  G.711.1, “Wideband embedded extension for ITU-T G.711 pulse code modulation “, sept. 2012.

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