Am 08.06.2014 11:49, schrieb Fons Adriaensen:
On Sun, Jun 08, 2014 at 06:38:50AM +0200, hermann meyer wrote:
The whole part that finds the exact frequency by comparing
phases is completely redundant. This information is never
really used. It just looks as if it is used.
That's true, we could leave that part out, that will spare us 0.2%
dsp load.
You're missing the point. Which is that the frequency info
*should* be used to decide how to map bins to a new frequency.
Also, it's easy to reduce CPU load by letting the whole thing
run at a quarter of the system sample rate. Which means that
for one octave down everything above 3 kHz is gone. But I guess
CPU load was not the only reason for doing that.
Ciao,
Without downsampling it use (well, 4xtimes more then now) 8% dsp load.
Most costs in the original source comes from that used values are not
pre-calculated.
But indeed, the reason for downsampling is that the limited frequency
range makes it sound good, and for guitar/bass 3kHz are far more then
enough when you would add a octave up/down to the original sound.
regards
hermann
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