DD4WH
commented
3 years ago - added de-emphasis, North-American users must change the time constant from 50e-6 to 75e-6
- added 15kHz Butterworth response lowpass filter
- added high shelf filter (user changeable)
- optimized stereo separation and WFM gain level
- toggle demod button to manually switch between FM Stereo and FM Mono
- on F7, MCU use is now at 60% for MONO and 79% for STEREO demodulation @192ksps sample rate
- small bugfixes for IIR filter coefficient calculations [all calculations now done with double precision, corrected wrong formulae]