March 18, 2014

SDR# now with IF Stage Noise Reduction Algorithm

SDR# has recently been updated to include an IF stage digital noise reduction algorithm. Previously digital noise reduction could be done at the audio output stage, but now it can be done to the IF signal as well. Performing digital noise reduction on the IF stage appears to work much better than at the audio stage. Update SDR# by running the install.bat file again.

Here are some comparison audio files tested on a noisy NFM voice signal for listening.

Original Signal

[audio https://www.rtl-sdr.com/wp-content/uploads/2014/03/IF_NR_OFF.mp3]

IF Noise Reduction (set to -12 dB)

[audio https://www.rtl-sdr.com/wp-content/uploads/2014/03/IF_NR.mp3]

Audio Noise Reduction (set to -80 dB)

[audio https://www.rtl-sdr.com/wp-content/uploads/2014/03/AF_NR.mp3]

sdrsharp_if_nr — SDR# IF Digital Noise Reduction Plugin

May 6, 2013

Digital Noise Reduction Plugin for SDRSharp

A new digital noise reduction plugin for SDRSharp has been released. It is packaged as part of the SDRSharp binaries. Head to the SDRSharp downloads page, and download and use the automated installer for rtl-sdr under the heading “Important note for RTL-SDR users”.

Then in SDRSharp, simply click “Enabled” in the Digital Noise Reduction plugin window and adjust the slider until you get good results. In testing I found significant improvements in noise reduction.