A Multimode SoC FPGA-Based Acoustic Camera for Wireless Sensor Networks
Host Publication: International Symposium on Reconfigurable Communication-centric Systems-on-Chip
Authors: B. da Silva Gomes, L. Segers, Q. Quevy, A. Braeken and A. Touhafi
Publication Date: Jul. 2018
Number of Pages: 8
Acoustic cameras allow the visualization of soundsources using microphone arrays and beamforming techniques.The required computational power increases with the numberof microphones in the array, the acoustic images resolution,and in particular, when targeting real-time. Such computationaldemand leads to a prohibitive power consumption for WirelessSensor Networks (WSNs). In this paper, we present a SoCFPGA based architecture to perform a low-power and real-timeaccurate acoustic imaging for WSNs. The high computationaldemand is satisfied by performing the acoustic acquisition andthe beamforming technique on the FPGA side. The hard-coreprocessor enhances and compresses the acoustic images beforetransmitting to the WSN. As a result, the WSN manages thesupported configuration modes of the acoustic camera. Forinstance, the resolution of the acoustic images can be adapted ondemandto satisfy the available networks BW while performingreal-time acoustic imaging. Our performance measurements showthat acoustic images are generated on the FPGA in real timewith resolutions of 160x120 pixels operating at 32 frames-persecond.Nevertheless, higher resolutions are achievable thanksto the exploitation of the hard-core processor available in SoCFPGAs such as Zynq.