Integrating a spectrum analyser into the EQ / filter graphs

[unfa]

There are some places that could make home for pretty frequency content information. For example the filter graphs in ADDsynth etc.

And even more importantly: the EQ plots - they are hungry for RTA work, I can tell :)

Here's the EQ graph:

And here's the filter graph in ADDsynth:

What do you think?

[fundamental]

On 02-05, unfa wrote:

There are some places that could make home for pretty frequency content information. For example the filter graphs in ADDsynth etc. What do you think?

I agree 100%. Spectral analysis + waveform analysis are two things which I wanted to get the new UI to perform, even though they didn't make it into the initial sprint.

Basically the process amounts to:

1. UI view with waveform/spectral analysis capabilities opens
2. Periodically (5-10 Hz?) on animation frames the view requests a particular realtime data stream to be 'watched' for a certain number of samples
3. ZynAddSubFX receives the watch request and on the next frame of audio it's able to start collecting data
4. Once the watch request has collected the needed data it is set to the UI
5. The UI can then perform the analysis
6. The UI then updates the screen on the next animation frame

So, if the process is understood, what needs to be done?

• Watch points currently work for multiple voices and single values, but they need to be tested with multiple values/per watch
• Watch points need to have a better triggering mechanism (e.g. zero crossing) if they're going to be used for viewing the time-domain waveform (looking into
• A log spaced Fourier transform needs to be added to the UI's numeric routines (I've written one elsewhere, so this is mostly copy/paste)
• The UI code for the request/update/draw needs to be done (minor amount of work compared to other parts IMO)
• Design decisions about multiple voices/left-right channels in the name of not adding excess CPU load
• Testing testing testing

[unfa]

I can help with testing and some aesthetics.

Do you think a small master waveform/spectrum view visible at all times would be a nice idea?