SR5 is an audio spectrum analyser and real time audio filter for use with communications receivers.

SR5 combines these functions in a modern, easy to use 32-bit multi-tasking application which you can run alongside other radio software.  SR5 has been designed to provide a comfortable spectral display AND to provide real-time audio filtering, without hogging the CPU and therefore allowing you to use other radio software at the same time.

When a communications receiver is in USB, LSB or CW mode, the frequencies present in audio output are directly related to the input radio frequency.  Therefore a spectral display of the audio gives a spectral display of the R.F.

This makes it very easy to see the shift of RTTY signals and the location of interfering carriers, for example.

RTTY signal around 8.5 MHz

By the use of the Fast Fourier Transform and its Inverse, SR5 provides the ability to draw any filter shape in real time.  With this facility you can combine pass band and notch filters, however you wish, across the audio band.

A pseudo-stereo effect can be created by the use of the forward and reverse FFT, in order to give physical spatial separation of audio signals according to their frequency, so you hear the spectrum as you see it.

SR5 also includes a customisable real time Linear dsp Filter and implements a built in 900 Hz CW filter of 200 Hz bandwidth as an example.

The program can monitor for overload and automatically reduce the input level if necessary.