Conference_programme: 21: Source identification and localization
Lecture: Sound source localization in 360 degrees using a circular microphone array
Author(s): Gaber Mohamed, Elnady Tamer, Elsabbagh Adel
Summary:
Sound source localization is useful in several applications such as noise activated cameras used in surveillance or used for video conferencing in meeting rooms. These cameras provide many advantages over a regular camera which keeps shooting in a certain direction. They can rotate and look in the direction of the sound source, then start recording. Large areas can be covered with minimum number of cameras. In this paper, sound source localization is performed using 15 free field microphones arranged in a circular array. All microphones acquire the sound signals simultaneously. From these signals, the Time Difference of Arrival (TDOA) between the microphones is measured. Using trilateration technique, the position of a sound source can be pin pointed. Trilateration calculations are very simple which make them ideal for real time applications where the computation time is of critical importance. The experimental setup includes 15 high precision microphones, connected to a National Instruments’ PXI Data Acquisition system. A program is written in LabVIEW to manage the data acquisition, TDOA estimation, trilateration calculation and the display of the results. A rotary mechanism is attached on top of the microphone holder with a stepper motor to point at the sound source and a character LCD to show the calculated values. The system is validated for a variety of angles and radial distances from the center of the array. The system is then ported to single board RIO (sbRIO) to act stand-alone, using low-cost commercial microphones which proved to give the same performance.
Corresponding author
Name: Mr Mohamed Gaber
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Country: Egypt
