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Re: White Noise Software For Linux

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On Sat, 20 Sep 2014, Floyd L. Davidson wrote:

> The Natural Philosopher <tnp@invalid.invalid> wrote:
>> On 20/09/14 11:44, Floyd L. Davidson wrote:
>>> The Natural Philosopher <tnp@invalid.invalid> wrote:
>>>> On 20/09/14 07:39, William Unruh wrote:
>>>>> On 2014-09-19, beforewisdom@gmail.com <beforewisdom@gmail.com> wrote:
>>>>>> I'm running Linux Mint 17.
>>>>>>
>>>>>> Can anyone recommend any white noise software that is controlled by a GUI?
>>>>>
>>>>> Wha is White noise sofware tha is controlled by a gui? White noise has
>>>>> only one controllable parameter and that is ampliude, and tha is
>>>>> conrollable by the volume control.
>>>>> I think you need o be a bit less elliptical.
>>>> Thnks for sayung that. saved me the trouble
>>>
>>> White noise is not restricted to just one controllable parameter.
>>>
>>> Distribution is controllable, hence it might be Gaussian or Poisson, or
>>> something else.
>>>
>> then its not white, its colored
>>
>>> It is also always bandwidth limited, which is controllable too.
>>>
>>
>> then its not white.
>
> The definition of "white noise" doesn't agree with those statements.
>
You can use a long shift register and suitable feedback to make a 
pseudo-random number generator, and run that fast enough and you get 
"white noise".  There was an IC made for that purpose at one point (and 
the same technique was used in things like the Commodore SID and the 
AY-4-8910 sound generator), and it would give you "white noise" the caveat 
being it probably was limited output the higher in frequency you got, but 
likely fine for the intended purpose of audio.

You can reverse bias a diode and generate white noise.  That works at 
audio, and it works at microwave, though better to have a better diode if 
you want higher frequencies.

But, this isn't a "let's limit bandwidth" so much as "this is good enough 
for the purposes at these frequencies".  White noise by any definition 
I've seen is broadband.

But, if you want "pink noise" for testing audio equipment, you start with 
a white noise generator (like that pseudo-random shift register setup) and 
a filter that falls off a certain amount per octave.  But that's no longer 
white noise.

   Michael

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White Noise Software For Linux beforewisdom@gmail.com - 2014-09-19 16:41 -0700
  Re: White Noise Software For Linux William Unruh <unruh@invalid.ca> - 2014-09-20 06:39 +0000
    Re: White Noise Software For Linux The Natural Philosopher <tnp@invalid.invalid> - 2014-09-20 09:32 +0100
      Re: White Noise Software For Linux floyd@apaflo.com (Floyd L. Davidson) - 2014-09-20 02:44 -0800
        Re: White Noise Software For Linux The Natural Philosopher <tnp@invalid.invalid> - 2014-09-20 11:53 +0100
          Re: White Noise Software For Linux floyd@apaflo.com (Floyd L. Davidson) - 2014-09-20 04:25 -0800
            Re: White Noise Software For Linux Michael Black <et472@ncf.ca> - 2014-09-20 11:52 -0400
        Re: White Noise Software For Linux William Unruh <unruh@invalid.ca> - 2014-09-22 18:31 +0000
          Re: White Noise Software For Linux floyd@apaflo.com (Floyd L. Davidson) - 2014-09-22 18:59 -0800
            Re: White Noise Software For Linux Michael Black <et472@ncf.ca> - 2014-09-22 23:30 -0400
              Re: White Noise Software For Linux floyd@apaflo.com (Floyd L. Davidson) - 2014-09-23 02:51 -0800
                Re: White Noise Software For Linux William Unruh <unruh@invalid.ca> - 2014-09-23 23:49 +0000
  Re: White Noise Software For Linux asdf <asdf@nospam.com> - 2014-09-21 09:55 +0000
    Re: White Noise Software For Linux Rich <rich@example.invalid> - 2014-09-21 12:41 +0000
      Re: White Noise Software For Linux JohnF <john@please.see.sig.for.email.com> - 2014-10-02 23:56 +0000
        Re: White Noise Software For Linux Rich <rich@example.invalid> - 2014-10-03 01:41 +0000
          Re: White Noise Software For Linux JohnF <john@please.see.sig.for.email.com> - 2014-10-03 02:13 +0000
            Re: White Noise Software For Linux Rich <rich@example.invalid> - 2014-10-03 02:55 +0000
              Re: White Noise Software For Linux JohnF <john@please.see.sig.for.email.com> - 2014-10-03 05:38 +0000
                Re: White Noise Software For Linux JohnF <john@please.see.sig.for.email.com> - 2014-10-03 11:50 +0000
                Re: White Noise Software For Linux Loki Harfagr <l0k1@thedarkdesign.free.fr.INVALID> - 2014-10-07 13:04 +0000
        Re: White Noise Software For Linux William Unruh <unruh@invalid.ca> - 2014-10-03 14:38 +0000
          Re: White Noise Software For Linux JohnF <john@please.see.sig.for.email.com> - 2014-10-08 03:18 +0000

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