Friday, September 13, 2013 4:00 p.m. in ETC 4.150
Acoustic beamforming involves mapping noise sources using an acoustical array. It discerns the direction from which the sound originates by the time delays that occur as the sound passes over an array of microphones such as a sound camera. A sound camera visualizes sound in color contours similar to the way a thermal camera visualizes temperature. A microphone array, which implements a beamforming method, locates noise sources visually, making it one of the best devices to detect buzz, squeak, and rattle (BSR) noises. This is a presentation and demonstration of a portable system developed with the cooperation of Hyundai Motors to visualize and identify annoying transient BSR noise sources in Hyundai automobiles. The solution involves developing a handheld sound camera with National Instruments LabVIEW system design software that identifies and displays noise sources in real time using microelectromechanical system (MEMS) and field-programmable gate array (FPGA) technologies to increase the image update rate and to decrease the total weight of the device.