A New Method for Noise Reduction in Receiving FM Stereo Signals

At a glance

The signal processing method presented here considerably improves FM stereo reception and enables full stereo reception in an extended area. It reduces noise and other types of interference to mono quality without deteriorating the left-right channel separation. It maintains the audio signal-to-noise ratio at a high level, down to the FM threshold. For a receiver using this new technology the stereo coverage area of a transmitter is extended to the mono coverage area.

To fully exploit the benefits of the method, functions of the FM receiver such as stereo-blend and hi-blend should be disabled.

Core features

Up to 22 dB less noise while preserving stereo separation

Reduction of all types of interference, including multipath interference and interference from IBOC

Only L and R needed as input signals

Undisturbed audio signals are passed audibly unchanged

Can be connected as a stand-alone device to existing receivers or audio post-processing units

Software-based solution (C-Code available), portable to software-designed radio (SDR)


Noise reduction while preserving stereo separation

more audio examples >>

The method is fully compatible with the pilot-tone system described in FM Stereo transmission standard ITU-R BS.450 and is applicable worldwide in the following sectors:

  • automotive
  • smartphones
  • Hi-Fi/high-end Stereo
  • professional broadcasting

Read more >>> (technology of the noise reduction method)