On Wed, 2011-10-19 at 14:37 +0000, Fons Adriaensen wrote:
> The two issues are related. The FFT based EQ in Jamin uses a form
> of block processing that leads to a filter that is not time-invariant,
> it produces AM on some frequencies. In the first release that was very
> obvious, you could actually hear it quite easily. Instead of changing
> the algorthm to a correct one (which would be quite similar) the Jamin
> devs chose to mitigate the effect by increasing the overlap between
> successive blocks. IIRC there are now 32 overlapping blocks at any
> time. This reduces the modulation to acceptable levels, but is also
> what is responsible for the high CPU load. A correct implementation of
> this type of EQ requires an overlap of half the FFT size, so it would
> require much less CPU.
>
> Ciao,
How much work would be require to implement this change?
Rich...
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Received on Wed Oct 19 20:15:02 2011
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