Request: FIR Convolver for Banana

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Request: FIR Convolver for Banana

Postby DonGateley » Wed Mar 18, 2015 4:22 am

The incorporation of an equalizer in Banana suggests a powerful extension to that function, an FIR convolver. There are numerous powerful applications of FIR convolution. An FIR can easily be created which implements an arbitrarily contoured frequency/phase response. With stereo FIR's it can be used for very realistic reverberation. With two stereo FIR's (called true stereo) it can mix cross channels for even better reverb and also for HRTF's (Head Related Transfer Function's) for stereo -> binaural conversion for 'phones so as to take them off the sides of your head and perceptually place the stereo sources in a live room. It can also be used to perform room equalization or device to device transformation for emulation. Or all of this simultaneously. :-)

Only a very basic function need be provided in Banana, the specificication of one or two FIR .wav files (or more if mult-channel flexibility is desired) within each output channel's equalizer panel. If Banana can monitor the specified files for changes and reload them on such an event all intelligence about creating, parameterizing and deeper selection functions can be pushed out of the app to some concurrently running app with no real time DSP functionality requirement. That basic convolution function in Banana, however, must be partitioned, zero latency convolution so as to maintain synchronization with video. DSP code for this operation is available and the function may even be available in sound libraries like FFTW now that Lake's patent on partitioned convolution has run out.

I'd love to hear your take on this, Vincent, and anyone else who might be listening.

Vincent Burel
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Re: Request: FIR Convolver for Banana

Postby Vincent Burel » Wed Mar 18, 2015 9:24 am

Well, convolution algorithms are used in some cases, but usually for specific applications not direlty showing this convolution process to user - The fact is that the "convolution" itself is not a usual tool, for example you will never find such process in a mixing console.

I know "convolution" as Audio DSP developper and i know several companies using this technology to make specific audio app, but i don't know the "convolution process" as audio production tool (because it's basically a tool for engineers or R&D department).

However Voicemeeter, thanks to its interconnection capabilities, should allow using Convolution Algorithms coming from extra application: many DAW provides such convolution function and can be connected to Voicemeeter Virtual ASIO point, and there is even some standalone application like or plug-in that could work with... to be experimented...

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