Re: [LAU] Subject: Albums under a label recorded and/or mixed with Linux

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From: <fons@...>
To: Patrick Shirkey <pshirkey@...>
Cc: <linux-audio-user@...>
Date: Sunday, September 26, 2010 - 1:12 pm

On Sun, Sep 26, 2010 at 05:50:24AM -0700, Patrick Shirkey wrote:

> Can you give me a little more idea why you feel using FFT in this method

Again, the choice is not between 'FFT' and 'convolution'. Jamin
performs convolution, and uses an FFT to do it. The problem is
that what Jamin does is *cyclic* convolution which produces
artefacts and is not the same as filtering. Filtering requires
*linear* convolution, which would actually be simpler, if you
take into account the steps that Jamin takes to reduce the ill
effects of the cyclic convolution.

As explained above, the difference is in step (6) which for
cyclic convolution is allowed to wrap around (meaning that
part of the output ends up where it shouldn't be), while
in linear convolution this is avoided by limiting the size
of the inputs. Unless you want the detailed maths I don't
think I could explain it any more clearly.

Ciao,

--
FA

There are three of them, and Alleline.

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Messages in current thread:
Re: [LAU] Subject: Albums under a label recorded and/or mixe..., Giorgio - Audiophilo, (Sat Sep 25, 8:43 pm)
Re: [LAU] Subject: Albums under a label recorded and/or mixe..., Philipp √úberbacher, (Thu Sep 23, 5:43 am)
[LAU] [ANN] QmidiNet 0.1.1 Released!, Rui Nuno Capela, (Fri Sep 24, 6:15 pm)
Re: [LAU] Subject: Albums under a label recorded and/or mixe..., , (Sun Sep 26, 1:12 pm)
Re: [LAU] Subject: Albums under a label recorded and/or mixe..., Gabriel M. Beddingfield, (Tue Sep 28, 4:09 pm)
Re: [LAU] Subject: Albums under a label recorded and/or mixe..., Philipp √úberbacher, (Sun Sep 26, 6:52 am)