linuxaudio.org

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

quoted text
> 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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