Re: [LAU] GuitarSynth - Linux-audio-user

Gerald

18 Apr 18 Apr

7:26 p.m.

New subject: GuitarSynth and polyphonic pitch estimation

Ok issues are fixed. I was sure that something like it exists, as aubio has it. I want to take this thing to be polyphonic, Ideally split up into polyphonic guitar to midi lv2 and maybe synth plugin that somehow apeals to guitarist (I know that vague, but i'm thinking of a synth thats piped through guitarixcab for that nice tube sound). But the emphasis will be the polyphonic audio (actually only guitar) to midi. The other stuff I wrote just not to have to deal with lv2 standard for now. And wavetables are easy and fun. I've done some research and the polyphonic pitch estimation falls under the wider topic called Blind Source Separation (BSS). Is there any expert on BSS here on the list? Gerald On 18.04.2015 14:55, Ralf Mardorf wrote:

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Thank you, builds without issues on Arch Linux. Running it works too, but I didn't test it. Jack audio IOs and Jack MIDI out are shown by QjackCtl. Are you aware that Rakarrack provides a relatively good working monophonic MIDI converter? JFTR I got those messages: $ ./GuitarSynth2 jack_client_new: deprecated Samplerate 44100 Buffersize 256 QObject::connect: No such slot GSEngine::setInputGain(int) QObject::connect: (sender name: 'InputVol') QObject::connect: No such slot GSEngine::setOutputGain(int) QObject::connect: (sender name: 'OutputVol') Regards, Ralf _______________________________________________ Linux-audio-user mailing list Linux-audio-user(a)lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-user

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Gerald Mwangi

19 Apr 19 Apr

9:49 a.m.

New subject: GuitarSynth and polyphonic pitch estimation

Hi, thanks for your interest. The pitch is stable after attack and before release phase. But during those phases it jumps arround. aubio has a method for detecting those phases, which I want to try out. When nothing is played it get irritated by the noise if your input gain is to high. You have to set your input gain low enough to silence the noise, but high enough that the synths kick in. For Hardware: Any cheap soundcard should do the job. I tried it with the onboard card of my computer. But if your looking for something beyond alpha stage checkout Rakarrack's monophonic audio to midi converter. My plans are to test aubio's polyphonic pitch abilities, which doesn't need a hex-pickup (is that what your building?). so stay tuned Gerald On 18.04.2015 20:47, Michael Nelson wrote:

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Hi, I am very interested in this. I've put some piezo-sensor saddles in a Strat, and have knocked up a rough PCB design for a set of preamps. I am *eventually* planning to build a prototype, and test it with my old Roland GR-1. I have been keen on investigating the next step -- constructing something as reliable and efficient as possible to do the actual conversion. I'm very interested in any progress you make. I have a lot going on right now in both my home and work lives (moved house recently, doing training at work, etc), but I would love to finish my prototype and test it with your code. What sort of minimum hardware do you think would be needed to get it to run reliably? I'll try to grab and compile the code at some point this week. Regards, Michael On 18 April 2015 at 18:26, Gerald <gerald.mwangi(a)gmx.de> wrote:

Ok issues are fixed. I was sure that something like it exists, as aubio has it. I want to take this thing to be polyphonic, Ideally split up into polyphonic guitar to midi lv2 and maybe synth plugin that somehow apeals to guitarist (I know that vague, but i'm thinking of a synth thats piped through guitarixcab for that nice tube sound). But the emphasis will be the polyphonic audio (actually only guitar) to midi. The other stuff I wrote just not to have to deal with lv2 standard for now. And wavetables are easy and fun. I've done some research and the polyphonic pitch estimation falls under the wider topic called Blind Source Separation (BSS). Is there any expert on BSS here on the list? Gerald On 18.04.2015 14:55, Ralf Mardorf wrote:

Thank you, builds without issues on Arch Linux. Running it works too, but I didn't test it. Jack audio IOs and Jack MIDI out are shown by QjackCtl. Are you aware that Rakarrack provides a relatively good working monophonic MIDI converter? JFTR I got those messages: $ ./GuitarSynth2 jack_client_new: deprecated Samplerate 44100 Buffersize 256 QObject::connect: No such slot GSEngine::setInputGain(int) QObject::connect: (sender name: 'InputVol') QObject::connect: No such slot GSEngine::setOutputGain(int) QObject::connect: (sender name: 'OutputVol') Regards, Ralf _______________________________________________ Linux-audio-user mailing list Linux-audio-user(a)lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-user

_______________________________________________ Linux-audio-user mailing list Linux-audio-user(a)lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-user

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Gerald Mwangi

12:06 p.m.

New subject: GuitarSynth and polyphonic pitch estimation

Oh. !FOR NOW! the software is just monophonic. It's a testbase which i want to add polyphony to it. So the CPU usage isn't high, although I haven't quantified it. Gerald On 19.04.2015 10:32, Michael Nelson wrote:

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When I asked about hardware, I was also wondering about CPU and memory requirements. I assume, for example, that a Raspberry Pi would not be up to the job of converting six signals... I'd like to find a compact, relatively low power box that could be dedicated to doing pitch-to-MIDI conversion.

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