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Message
From: -boggy<boggy@e...>
Date: Sun Nov 20 15:34:38 CET 2005
Subject: [oc] random integer - VHDL
Hi Charles,NonDigital@g... wrote: >Hi-
>
> I read your discussion with interest. I am charged with generating
>random signals for testing seismometers in the frequency span 1mHz to
>50Hz.
>Question 1: Is it possible to simply lower the spectrum of the
>generated- noise by lowering the clock frequency?
>
>
I think: yes.
But, your lower frequency of your noise is mainly defined with duration
of your sequence.
Sample rate define maximum frequency, and _also_ duration of sequence if
number of
samples is constant.
>Question 2: What is the "diehard" test? I am searching for a method of
>testing random signals or the underlying numbers. I have read that a
>good archiving file compressor will give a qualitative measure of
>randomness based on the degree of compression achieved. Is this
>accurate?
> (A friend of mine wrote a program to win at one of the Las Vegas
>games, and based on his results drove to Vegas and lost his money. He
>discovered that the fly in the ointment was allowing his PC to generate
>the random numbers for the game simulation, without any checking.)
>-Charles
>
>
Try (well known) MLS (Maximum Length Sequence) for generating pseudo
random stream...
this method is used in audio/acoustics measurements, for example.
Possibly you can find responses to your questions because MLS is well
analyzed.
Hope this helps,
Best regards
-boggy
BoZo Electronics
http://www.bozoel.com
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