FPGA Audio ID: what the FPGA does

speech: LibriSpeech readings
vehicle: engines, airplanes, helicopters, trains
machinery: chainsaws, hand saws, vacuum cleaners, washing machines
alarm: sirens, clock alarms, car horns, church bells
background: the other 38 ESC-50 sound types (rain, dogs, footsteps, …)

A PDM microphone on a Digilent Cmod A7-35T. Logic in the FPGA turns the mic's pulses into a spectrum; a MicroBlaze V processor inside the same chip turns spectra into one of five sound categories twice a second. Click any block, or follow the sound from the microphone.

XC7A35T Artix-7 one 96 MHz clock 4,093 LUTs (20%) 39 / 50 block RAMs 12 DSP slices timing met, +0.38 ns 2 decisions per second boots from flash in ~0.1 s

external parts & pins signal-processing logic RAM / ROM firmware on the processor platform outputs

Solid lines carry audio data (dots show the direction); dashed lines are control or debug. ← → keys step through the blocks.