Mark Taylor wrote:
>
> This could very will be a bug, but it my also just be the correct
> resonce of the medium quality lowpass filter used by LAME.
>
> For resampling, LAME is using a 19 point lowpass filter with
> a Blackman window. The position of the window is adjusted
> to do the resampling at the same time.
>
> For a near-perfect filter, you need to use many more than 19 points
> (like thousands, and then it becomes benificial to use a lapped
> transform instead of an FIR filter) which will be much slower.
> CoolEdit may be doing something like that.
>
> Before we look for bugs, maybe David could test LAME
> with a larger filter size?
>
> David: can you run the same test with a stencil 10x bigger?
> To do this, change:
>
> BLACKSIZE = 200 change in util.h
> filter_l = 191 change in util.c
>
> If this improves results, then I guess we will have to
> add yet another option :-)
>
Ahh yesss...
As you one remarked - yet another option nobody knows the ideal value
for ;-)
Upsampling uses a different algorithm - has anyone looked at that?
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