Development of a Portable Acoustic Beamformer using FPGA Technology and Digital Microphones
Published June 15, 2015 by SAE International in United States
Annotation of this paper is available
This is an overview of the development of a portable, real-time acoustic beamformer based on FPGA (Field Programmable Gate Arrays) and digital microphones for noise source identification. Microphone arrays can be a useful tool in identifying noise sources and give designers an image of noise distribution.
The beamforming algorithm is a classic and efficient algorithm for signal processing of microphone arrays and is the core of many microphone array systems. High-speed real-time beamforming has not been implemented much in a portable instrument because it requires large computational resources. Utilizing a beamforming algorithm running on a Field Programmable Gate Array (FPGA), this camera is able to detect and locate both stationary and moving noise sources. A high-resolution optical camera located in the middle of the device records images at a rate of 25 frames per second. The use of the FPGA technology and digital microphones provides increased performance, reduced cost and weight.
CitationVeggeberg, K. and Denton, M., "Development of a Portable Acoustic Beamformer using FPGA Technology and Digital Microphones," SAE Technical Paper 2015-01-2246, 2015, https://doi.org/10.4271/2015-01-2246.
- Zheng, Z. and Wei, L. “Development of a Real Time Noise Source Identification System using Recofigurable FPGA Technology.” Inter-Noise 2008 Paper, 2008.
- Read, P. and Meyer, M. “Restoration of Motion Picture Film,” Butterworth-Heinemann, 2000, pp. 24-26.
- Littrell, R. “High Performance Piezoelectric MEMS Microphones,” PhD dissertation, University of Michigan, 2010. p. 57-58.
- Lewis, J. and Moss, B. “MEMS Microphone: The Future for Hearing Aids. Invensense, Document Number, WP-00, 2013.
- Analog Devices MEMS Microphone Technology & Overview presentation, 2013.
- Kim, Y. and Ih, K. “Hyundai Uses a Portable Sound Camera for Buzz, Squeak, and Rattle Studies.” Available from http://sine.ni.com/cs/app/doc/p/id/cs-15675