On Friday 12 March 2010 15:20:33 fons@email-addr-hidden 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
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Received on Fri Mar 12 16:15:01 2010
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