On Wed, Oct 19, 2011 at 10:37 AM, Fons Adriaensen <fons@email-addr-hidden> 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.
My main concern with Jamin these days is whether or not it's being
actively developed and/or supported... it hasn't been updated in quite
a while (0.95 came out in 2005, right?).
-- Brett W. McCoy -- http://www.electricminstrel.com ------------------------------------------------------------------------ "In the rhythm of music a secret is hidden; If I were to divulge it, it would overturn the world." -- Jelaleddin Rumi _______________________________________________ Linux-audio-user mailing list Linux-audio-user@email-addr-hidden http://lists.linuxaudio.org/listinfo/linux-audio-userReceived on Wed Oct 19 20:15:01 2011
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