pink or white noise (daft?) idea
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Posts: 46,084
Vernon asked about STAMP generated noise. Can't say I
know the difference between pink and white but here's
a thought - although it depends how fast the stamp is.
1. THE NOISE Assuming you have a source you like -
like the analogue one - digitise onto PC and use a
wave editor to look for natural repeat points and
zero-crossing then edit it into a loop and see if it's
annoying / what you want.
2. THE GENERATOR Years ago there was a lot of interest
in using microporcessors in polyphonic synthesisers.
It was quite possible to get a good result from a 1MHz
6502 with up to 4 'voices'. The tables were only 256
bytes long and usually jumped into at longish gaps so
sampling was quite sparse. OK that was programmed in
very tight assembly language but the STAMP seems
pretty fast! Program a look up table to read data and
send to DAC (fastest is probably a resisitor network
on O/P pins) and then subsequently filtered. This can
be tested my making a sine wave table and then seeing
what frequency comes out.
3. IF STAMP is fast enough plug the noise table into
the system.
Those with more STAMP experience might say it's far
too slow to do this...
Adrian
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know the difference between pink and white but here's
a thought - although it depends how fast the stamp is.
1. THE NOISE Assuming you have a source you like -
like the analogue one - digitise onto PC and use a
wave editor to look for natural repeat points and
zero-crossing then edit it into a loop and see if it's
annoying / what you want.
2. THE GENERATOR Years ago there was a lot of interest
in using microporcessors in polyphonic synthesisers.
It was quite possible to get a good result from a 1MHz
6502 with up to 4 'voices'. The tables were only 256
bytes long and usually jumped into at longish gaps so
sampling was quite sparse. OK that was programmed in
very tight assembly language but the STAMP seems
pretty fast! Program a look up table to read data and
send to DAC (fastest is probably a resisitor network
on O/P pins) and then subsequently filtered. This can
be tested my making a sine wave table and then seeing
what frequency comes out.
3. IF STAMP is fast enough plug the noise table into
the system.
Those with more STAMP experience might say it's far
too slow to do this...
Adrian
=====
-
*********************************************
________________________________________________________________________
Want to chat instantly with your online friends? Get the FREE Yahoo!
Messenger http://uk.messenger.yahoo.com/