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 Forum index » Instruments and Equipment » Samplers
Bit reduction/crushing
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Electronicant



Joined: Feb 23, 2006
Posts: 81
Location: North

PostPosted: Tue Dec 09, 2008 1:56 pm    Post subject: Bit reduction/crushing Reply with quote  Mark this post and the followings unread

Hi all. I´m looking for a source for bit reduction. Which technique is the best to reduce the sample resolution on a hardware sampler? let´s say that you have a 16 or 12 bit sample and want to transform it to 8 bit. There´s bit crucher´s but they seem a bit expensive and goes from 8 bits and down to 1. I´d rather see something go from 8 and up. Can you make it on some sort of compressor? external ADC or DAC DIY module?

Thanks for tip
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noisedeputy



Joined: Nov 15, 2008
Posts: 17
Location: Boston, MA

PostPosted: Wed Dec 10, 2008 4:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

go to make.com and search for Arduino Bitcrusher, this is a very easy to make Bitcrusher pedal with just an arduino and a few jacks.

You can also look for bugbrand's Lo-fi Bitcrusher, it is posted in the DIY section of this forum (stickied actually)

Can also check out Zfex lo-fi, and there's the Ibanez Lo-fi pedal as well.

lots of people make DIY 8-bitish lo-fi pedals, you can find lots of schematics online, and find them for sale on ebay.


LOTS of choices, for bitcrushing, many different styles out there. I know sp-303 has bitcrushing on it eternally.
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fac



Joined: Dec 08, 2007
Posts: 162
Location: Mexico
G2 patch files: 1

PostPosted: Sun Jul 26, 2009 9:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

One trick is to reduce the level of the sample by -6 db per reduced bit, and then normalize the sample.

For example, if you have a 16-bit sampler and want 12-bit samples, you have to attenuate them by -24 db, either by using destructive editing functions on your sampler, or by playing the sample quieter while resampling it.

Bit reduction is performed by trimming the N less significant bits of each sample, which is equivalent to a binary shift of N bits to the right, which is also equivalent to dividing the sample values by 2 to the N, which, in turn, is equivalent to reducing the level by approximately -6N db.

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