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 Forum index » DIY Hardware and Software » Thomas Henry designs
Blue noise?
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cloudberry



Joined: Jun 30, 2009
Posts: 30
Location: uk

PostPosted: Tue May 26, 2015 3:29 pm    Post subject: Blue noise? Reply with quote  Mark this post and the followings unread

Hi all,


Does anyone have a (preferably analogue) circuit for blue noise? AKA white noise through a 3dB/oct high pass filter? I've been looking through Thomas Henry's Noise Generator Cookbook, and the stuff about pink noise got me thinking about its 'opposite', ie blue.
Knowing Mr Henry's predilection for noisy things, I've posted this here. Hope this is OK.

Thoughts anyone?
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Blue Hell
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Joined: Apr 03, 2004
Posts: 21103
Location: The Netherlands, Enschede
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PostPosted: Tue May 26, 2015 3:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

It often works with filters to subtract the filter output from it's input to get the opposite response curve, for instance low pass -> high pass. That would just be an opamp and some resistors. So maybe it's worth a try on a pink noise filter.
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cloudberry



Joined: Jun 30, 2009
Posts: 30
Location: uk

PostPosted: Tue May 26, 2015 3:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

ooh, cunning! Thankyou. Shall try.
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