Digital Vocoder Effect On FPGA

This effect was implemented on a Xilinx FPGA board using the hardware description language Verilog. The vocoder was designed using a digital filter bank (16 filters) to break down the carrier signal and the modulating signal. Each corresponding band is then combined to produce the output signal. There are 3 types of carrier signals generated onboard: sawtooth wave, square wave, and white noise (with the additional option of polyphony for pitched carriers). Note that there is much more spectral energy contained in the white noise signal than in the other carrier signals, which is why it sounds so loud in comparison.