Re: [LAU] octaver (plugin) for bass

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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Received on Sun Jun 8 16:15:02 2014