Audio Filter DSP for Shorthwave Receiver. This Is a Digital Signal Processing to compute the audio of a Radio receiver. The project Is based on the Raspberry Pico pi board. The project implements some usefull filters and show how to setup a simple audio dsp realtime processing chain using ADC In and I2S Out.
The 8k decimation may be causing high frequency noise in SSB and CW filter. I add post interpolation 0-4kHz filter to cutout this noise.