NoiseOFF V1.0 Audio DSP Filter

This small DSP filter improves the reception of SW communications receivers. The board provides two filters for SSB (normal and narrow), one filter for CW and a noise reduction algorithm. The filter must be inserted into the audio path between the output of the receiver and an external active speaker or headphones.

Filters: SSB normal (250 - 2300 Hz), SSB narrow (250 - 1800 Hz), CW (300 , centered at 750 Hz)

Noise reduction: LMS based, adjustable depth (4 steps)

Input impedance: 32 ohms

Output impedance: 32 ohms

Gain: 0 dB