As an illustration of my newly-released software I dug through the
recent archive for something that would be easy and fun to implement
in Moselle, and came across this post from forum stalwart Robert
Bistow-Johnson.
The following is a Moselle program (or patch) that implements the
first
On 03/11/2013, robert bristow-johnson r...@audioimagination.com wrote:
the point is that if you upsample, then soft-clip, then LPF, and finally
downsample back to the original sample rate, you need only prevent the
aliases from getting back into your *original* baseband. it doesn't
matter
I think I've been caught out on the html email thing as well, I wonder
how many posts have gone completely missing that I've sent? Here is
one I sent 5 days ago, sorry if this is a double up, I checked the
archives but couldn't find anything:
Hi Robert,
Thanks very much for the post! I plotted
On 11/2/13 6:58 PM, Wen Xue wrote:
But, soft-clipping is not going to change periodicity, is it?
it should not. that's why we don't want non-harmonic components
(aliases) to survive the soft-clipping process.
the point is that if you upsample, then soft-clip, then LPF, and finally
If you are just looking for a minimally noticable softclip, with analog
sound, just two three-order distortions in series is optimal. With a
crossfade on 1 and 2, and a threshold on knee-depth, it really gives a
sound many wants, and is very optimal, in terms of computing power
required
But, soft-clipping is not going to change periodicity, is it?
So if you soft-clip a sine wave, be it polynomial or not, the outcome is
periodical at the same period, so contains only perfect harmonics. It
cannot behave in the folded alias way one usually suspect.
Xue
On 02/11/2013 06:36,
On 10/30/13 4:24 PM, Theo Verelst wrote:
For whoever follows this, I thought and worked a bit about the
clipping idea, and especially I was thinking about the harmonic
behavior of the clipping function of N degree, so i tried using
Maxima, and found there are distinct harmonics added to a
On 2013-11-01, robert bristow-johnson wrote:
just to be clear. the general rule is that an Nth-order polynomial
can generate images at frequencies up to the Nth multiple of the
frequency of the original baseband image.
Quite so. So in addition, if you want to really keep it clean of
Hi
For whoever follows this, I thought and worked a bit about the clipping
idea, and especially I was thinking about the harmonic behavior of the
clipping function of N degree, so i tried using Maxima, and found there
are distinct harmonics added to a sine wave passing through it.
Maybe this
robert bristow-johnson wrote:
at the last AES in NYC, i was talking with some other folks (that likely
hang out here, too) about this family of soft clipping curves made outa
polynomials...
Th script you supplied worked fine with the Open Source (and free)
Octave as well, and gives this
: music-dsp-boun...@music.columbia.edu
[mailto:music-dsp-boun...@music.columbia.edu] On Behalf Of robert
bristow-johnson
Sent: 29 October 2013 01:56
To: music-dsp@music.columbia.edu
Subject: [music-dsp] family of soft clipping functions.
at the last AES in NYC, i was talking with some other folks
robert bristow-johnson wrote:
x
g(x) = integral{ (1 - v^2)^N dv}
0
you figger this out using binomial expansion and integrating each power
term.
Maybe a nice worksheet of (wx)Maxima, the FOS algebraic manipulation
programs:
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