linuxaudio.org

On Wed, Oct 19, 2011 at 10:37 AM, 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.

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

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"In the rhythm of music a secret is hidden; If I were to divulge it,

it would overturn the world."

    -- Jelaleddin Rumi

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