Post date: Oct 13, 2009 7:58:48 AM
Acoustic Source Localization is a very well established technique that has a wide range of applications. Blind signal separation is still a very current area of research, with no generally acceptable solution. My project consisted of studying the benefits and limitations of these existing techniques, and applying them to solve the problem of sound source separation and localization.In this project we are going to discuss the acoustic sound source localization in a plane using the Time Difference of Arrival Algorithm (TDOA) positioning method.We assume that the sound source is a point source and the microphones we use have Omni directional receiving pattern (although realistic modelling can be done). So there is a delay in the sound wave received by a pair of microphones.The object localization requires three microphones in a 2-D plane since two coupled microphones can give only one information i.e., direction of source. The acoustic waves generated by the source reaches the first microphone earlier than the second. The difference in the propagation delay and that the acoustic velocity in air is known, we calculate the path difference of the acoustic waves.