FAST FPGA Audio Processor Prototype

The FAST FPGA audio processor is currently being developed as part of the FAST project. It provides a round-trip audio latency inferior to 80us. It also hosts an Analog to Digital Converter (ADC) for sensors offering a "control-to-sound" latency inferior to 100us.

It is based on a Digilent Zybo Z7 board hosting a Xilinx Zynq 7000 FPGA that is used for audio processing. The FAST FPGA audio processor is fully programmable with the Faust programming language at high level through USB.

For reference, here's the Faust program used in the above demo video:

import("stdfaust.lib");
oscFreq = hslider("oscFreq",80,50,5000,0.01);
lfoFreq = hslider("lfoFreq",1,0.01,50,0.01);
lfoRange = hslider("lfoRange",1000,10,5000,0.01);
oscGain = hslider("oscGain",0.5,0,1,0.01);
noiseGain = hslider("noiseGain",0,0,1,0.01);
LFO = os.lf_triangle(lfoFreq)*0.5 + 0.5;
process = os.sawtooth(oscFreq)*oscGain + no.noise*noiseGain : fi.resonlp(LFO*lfoRange+50,5,1);

(you can try it directly in your Web browser in the Faust Web IDE).

Next steps involve:

  • improving the performances of the system to run large Faust programs,
  • adding more audio inputs and outputs (we're currently aiming at 32x32),
  • use this system for active control.

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