Subject: Re: [linux-audio-user] Re: Removing distortion
From: Patrick Shirkey (pshirkey_AT_boosthardware.com)
Date: Mon Jul 08 2002 - 13:19:57 EEST
Steve Harris wrote:
> On Sat, Jul 06, 2002 at 12:18:33 -0700, Kingsley G. Morse Jr. wrote:
>
>>On Sat:12:42, Rob wrote:
>>I see that the ladspa plugins
>>
>> /usr/lib/ladspa/declip_1195.so and
>>
>> /usr/lib/ladspa/hermes_filter_1200.so
>>
>>contain the string "clip", so I'm wondering if they
>>may provide a free linux alternative for removing
>>clipping.
>
>
> Not really. IIRC declip is designed to prevent audio that hasn't been
> outputted yet from clipping.
>
> Declipping functions are usually non streaming (ie. they scan backwards and
> forwards thorugh the audio) so LADSPA isn't really appropriate.
>
>
I was told on Saturday that the way to do it is to invert the signal,
cut off all the peaks then reinvert the signal again. At least that was
how my friend fixed up a vinyl track that he was ahem, using.
Apparently the process of inverting seperates the peaks from the stuff
you want to keep in a dramatic fashion and you can just run the signal
through a lowpass filter to get rid of the peaks.
I haven't tried it but it sounded reasonable.
-- Patrick Shirkey - Boost Hardware Ltd. For the discerning hardware connoisseur http://www.boosthardware.com http://www.boosthardware.com/LAU/guide/ ========================================
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