Pieter Palmers wrote: > Robin Gareus wrote: >> Erik de Castro Lopo wrote: >>> Robin Gareus wrote: >>> >>> When Spice loads the libsndfile component, can the component find out >>> the inter-sample period used by Spice? >> >> no. Spice does not use a constant interval; else it would be straight >> forward to use libsamplerate. >> >>> If the above is not possible, I suggest that you up sample the audio >>> by say 128 times and then linearly interpolate to get whatever inter >>> sample values you need. >> >> sounds like a great idea. >> >> I should do that with the output too, but it's a little more complex >> there: In the beginning I've tried to take the average for all the >> "spice"-samples matching the corresponding audio-sample. I've only tried >> that up to 1/(4*Fsample) and it gave much worse results than just taking >> the closest sample... - combining interpolation and resampling could be >> the solution. >> >> now that I've got the framework, I'll dig into the details.. > > Since you're patching ngspice anyway, maybe introducing a fixed-timestep > behavior into ngspice is easier? IMHO it's the 'correct' solution (cfr > other mails).
I have not dug that deep into ngSpice - but from what I've gathered every instance can modify the time-step depending on different conditions for each element during the simulation. - That would be a reason to implement the audio-sink as element (or model) rather than 'print' command.. ngSpice too interpolates points during a transient analysis, and a 1st order might be the best one can get anyway. gnucap might have been the better choice. - When I started, I thought it'd be a nice /afternoon/ project to fire up SPICE. yawn. - I'll try upsampling and interpolating input-samples and the reverse on the output - but else I'm heading back to the drawing board.. and other endeavors. more later, gotta run now. robin _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-dev
