On the design and FPGA implementation of real-time scanned-array 2D frequency-planar beam filters

We propose a field programmable gate array (FPGA) circuit-based 2D IIR single-chip spatio-temporal filter having low hardware complexity for the purpose of processing 2D scanned-array sampled signals. The filter is suitable for the selective real-time filtering of broadband spatio-temporal plane waves by employing low-order highly-selective 2D frequency-planar beam-shaped filter passbands. The design and hardware co-simulation is described for a Xilinx FPGA chip. Employing a linear array of N sensors, temporal sampling rates up to f_AS/N MHz per sensor are feasible using one A/D converter and a FPGA chip, clocked at f_AS MHz. A directional audio example is given for CD quality propagating sound waves.