Re: [music-dsp] Fwd: Re: [dumb question] do Eurorack audio and CV signals use the same connectors?

2017-12-16 Thread Laurent de Soras
Laurie wrote: Diode drops are not acceptable and a reversed diode needs to be rated to several amps at least. You can use MOSFETs to avoid diode drops, although they are a bit more expensive than diodes.

Re: [music-dsp] Low cost DSPs

2017-02-16 Thread Laurent de Soras
Philippe Wicker wrote: the A15 is not good at providing a sustained high cpu usage without getting rapidly too hot.You rapidly get a throttling cpu (the OS reduces the core frequency to a bare minimum [...] the code compiled in 64bit for the 1.5GHz C2 runs nearly as fast than the same code

Re: [music-dsp] Low cost DSPs

2017-02-16 Thread Laurent de Soras
Pablo Riera wrote: I try some stuff on Rpi with supercollider + jack but I couldn't manage to have lots of performance. As a synth it would crash with more than 6 polyphony with 256 sample buffers. I think the supercollider build was messed up but need more testing. What audio framework are

Re: [music-dsp] Low cost DSPs

2017-02-16 Thread Laurent de Soras
Does anyone has experience with some of these combinations or others Teensy + audio board is popular too. and could share comments on technical issues, ease of use, latency, audio quality (noise, max sampling rate), etc. I’m working on something using a Raspberry Pi 3 + USB audio. Latency

Re: [music-dsp] ± 45° Hilbert transformer using pair of IIR APFs

2017-02-05 Thread Laurent de Soras
robert bristow-johnson wrote: cool, so it appears from your comments to be real poles. complex conjugate poles are not considered in the design. i wonder why that is? I’m not the author of the formula, I just implemented it and don’t understand how it produces these filters. I guess the

Re: [music-dsp] ± 45° Hilbert transformer using pair of IIR APFs

2017-02-05 Thread Laurent de Soras
robert bristow-johnson wrote: so Olli, how do you get your coefficients? (if i may ask?) If I may reply, I wrote long time ago a C++ library implementing this kind of polyphase halfband filter, including a coefficient calculator involving elliptic stuff (way beyond my knowledge). Check the

Re: [music-dsp] Can anyone figure out this simple, but apparently wrong, mixing technique?

2016-12-11 Thread Laurent de Soras
robert bristow-johnson wrote: it's this Victor Toth article: http://www.vttoth.com/CMS/index.php/technical-notes/68 and it doesn't seem to make sense to me. The article is 16 year old now and mention even much older technologies. I think that compression/limiting (or ducking?) + dithering is

Re: [music-dsp] Android related audio group / mailing list?

2016-06-05 Thread Laurent de Soras
Nuno Santos wrote: I’m struggling with performance questions on Android. https://groups.google.com/forum/#!topic/andraudio/zuXnnmZyePk Your results tell that your program computes 10^9 operations in a few dozen microseconds. There is definitely something wrong here because even the most

Re: [music-dsp] Release pyo 0.8.0 (Python dsp library)

2016-05-19 Thread Laurent de Soras
list_em...@icloud.com wrote: (Too bad the gifs on the devmaster.net page have gone missing.) I previously saved this page with all the graphics: ___ dupswapdrop: music-dsp mailing

Re: [music-dsp] Changing Biquad filter coefficients on-the-fly, how to handle filter state?

2016-03-01 Thread Laurent de Soras
Paul Stoffregen wrote: Does anyone have any suggestions or publications or references to best practices for what to do with the state variables of a biquad filter when changing the coefficients? Use an implementation designed to handle nicely coefficient changes. For example the trapezoidal

Re: [music-dsp] MSVC 2012/2013 upgrade with audio differences

2015-02-25 Thread Laurent de Soras
-generated codes. Make sure that precision, rounding and behaviour with denormals are set exactly the same in all the code paths. Also, check the strictness of the Floating Point Model in the code generation options. -- Laurent de Soras | Ohm Force DSP developer

Re: [music-dsp] IIR Coefficient Switching Glitches

2013-11-02 Thread Laurent de Soras
Chris Townsend wrote: Any ideas? Recommendations? Probably this: http://cytomic.com/files/dsp/SvfLinearTrapOptimised.pdf -- Laurent de Soras | Ohm Force DSP developer Software designer | Digital Audio Software http://ldesoras.free.fr | http