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This article describes a prototype FPGA implementation, of a delay-and-sum beamformer in the audio frequency range. This prototype is essentially a real-time acoustic camera, which is used to estimate a sound field intensity. Data acquisition is performed by means of a 4-microphone square array and the delay- and-sum beamforming algorithm is implemented on a Xilinx Spartan 3AN FPGA. The computed acoustic...
The real-time acoustic camera prototype. consists of a field-programmable gate array (FPGA) base-board and an A/D-conversion board with 32 attached microphone modules arranged in a rectangular array. The FPGA base-board is connected to an external TFT display. Two loudspeakers will be connected to a laptop and play audio test-signals. The external display visualizes the location and intensity of the...
Acoustic cameras visualize the origin and intensity of sound waves using an array of microphones and sophisticated signal-processing algorithms. Due to the high memory-bandwidth and signal-processing complexity required by such algorithms, current available devices either compute the corresponding intensity-images off-line or require large and expensive hardware equipment. In this paper, we describe...
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