Re: [music-dsp] Comb filter decay wrt. feedback

2015-05-13 Thread Tim Goetze
[Peter S] but when i consider that part of designing comb filters tuned to musical notes, i have to at least pause and wonder which interpolation would be better or sufficient for whatever application and that's why it didn't seem trivial to me. Linear interpolation is fast and dirty, and

Re: [music-dsp] Simulating Valve Amps

2014-06-20 Thread Tim Goetze
[Andrew Simper] On 18 June 2014 21:01, Tim Goetze t...@quitte.de wrote: I absolutely agree that this looks to be the most promising approach in terms of realism. However, the last time I looked into this, the computational cost seemed a good deal too high for a realtime implementation sharing

Re: [music-dsp] Simulating Valve Amps

2014-06-18 Thread Tim Goetze
[Sampo Syreeni] From what (very little!) I know of hardcore analog simulations, I'd say that is part of a more general and much nastier problem. That's the interaction one: whereas digital signal graphs have a definite direction of signal flow, there's no such thing on the analog side no

Re: [music-dsp] Simulating Valve Amps

2014-06-18 Thread Tim Goetze
wasn't talking about the tone controls but about the whole amp and cabinet business. Thanks to the work of Yeh, I personally consider the tonestack a solved problem, or at least one of least concern for the time being. Cheers, Tim On 18 Jun 2014, at 10:01, Tim Goetze t...@quitte.de wrote: [Sampo

Re: [music-dsp] Oversampling and CPU + Bandlimited Distortion Effects?

2013-11-30 Thread Tim Goetze
[Thomas Strathmann] BTW, for those who can read some German, this book https://hps.hs-regensburg.de/~elektrogitarre/ might be a fascinating read. It's a scholarly treatise on the physics of e-guitars. Nice! There's a truly dire need for the scientific approach to the physics of the electric

Re: [music-dsp] need help with gnuplot and octave on my mac.

2013-04-02 Thread Tim Goetze
[robert bristow-johnson] Reason: Incompatible library version: libfontconfig.1.dylib requires version 13.0.0 or later, but libfreetype.6.dylib provides version 10.0.0 It appears the version of libfreetype installed on your system is too old. The required version number 13.0.0 is a bit

Re: [music-dsp] Efficiency of clear/copy/offset buffers

2013-03-09 Thread Tim Goetze
[robert bristow-johnson] On 3/9/13 1:31 PM, Wen Xue wrote: I think one can trust the compiler to handle a/3.14 as a multiplication. If it doesn't it'd probably be worse to write a*(1/3.14), for this would be a division AND a multiplication. there are some awful crappy compilers out there.

Re: [music-dsp] Efficiency of clear/copy/offset buffers

2013-03-09 Thread Tim Goetze
[Tim Blechmann] Though recent gcc versions will replace the above a/3.14 with a multiplication, I remember a case where the denominator was constant as well but not quite as explicitly stated, where gcc 4.x produced a division instruction. not necessarily: in floating point math a/b and a *

Re: [music-dsp] Noise gate for guitar amplifiers and hysteresis

2012-07-05 Thread Tim Goetze
[robert bristow-johnson] first, you need to decide of your level is to be measured as peak level or rms level or mean abs value or whatever. I'd like to throw in that I've gotten excellent results (for electric guitar) from a design that considers the instantaneous peak level for opening and