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.