jks

v1.279 has improved spectrum filter options. In addition to the default IIR filter you can now select an MMA (modified moving average) and EMA (exponential moving average) filter or no filtering at all. There is also a new slider for the parameter associated with each filtering algorithm:

IIR: param = gain coefficient 0..1 (slower..faster)
MMA: param = averaging size in samples (1..64)
EMA: param = decay period (averaging size) in samples (1..64)

The URL parameter options sp= and spp= allow the filter and filter parameter to be preset in the URL. See http://kiwisdr.com/quickstart/index.html#id-user-tune

I implemented a minimum decay rate for the IIR filter. For various reasons the filtering is implemented after the waterfall colormap scaling. And with a more restricted colormap range (i.e. WF min slider less negative so no-signal waterfall area is black) the IIR filter would not decay for small signals as was observed.

There is also a new "GND" momentary button (i.e. click/touch and hold). This zeros (grounds) the waterfall/spectrum input data so you can see how the various spectrum filters decay under no-signal conditions.

@Martin: Done.

I split these comments out of the ongoing Massdrop thread as it seemed like they deserved their own topic.

Good catch. This is a consequence of how the extension code is now loaded only on demand when selected from the extension menu or via the ext= URL parameter. The same needs to occur from the denoiser/autonotch buttons in the audio tab.

Good catch. This is a consequence of how the extension code is now loaded only on demand when selected from the extension menu or via the ext= URL parameter. The same needs to occur from the denoiser/autonotch buttons in the audio tab.