On Friday 12 March 2010 15:20:33 [email protected] wrote: > Do you want a logarithmic *scale* or a logarithmic *analyser* ? > In other words what exactly are you trying to do ?
> How accurately you can measure certain things (or if > they will be visible at all) depends on the analyser > bandwidth and the levell of its sidelobes. For Jaaa > the BW is constant over the F range, and all sidelobes > are below -80 dB (and decreasing as you move away from > the center frequency). For Japa BW is function of F and > sidelobes are below -40 dB. The idea (under discussing at some of russian DIY audio forum) is to use multitone signal, compare it before and after audio amplifier and (having such *multiple* results for *different* amplifiers) to try get some - at least partially useful - correlation between results and subjective audio perceptions (in particular, "clearance" - don't know an appropriate English term; it's about how easy different instruments can be "separated" in brain). I'm not sure it is a right way, but would like to take participation in the experiment (especially with my last SE-invention :-)). Fellows (using appropriate software analyzers under MS win) show very clear spectrum plots for original multitone signal (ten -20db tones in 20Hz - 20KHz range). Having single-boot Linux, I'd want to get something the same :-) Andrew _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
