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Re: White Noise Software For Linux

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JohnF <john@please.see.sig.for.email.com> wrote:
> Rich <rich@example.invalid> wrote:
> > JohnF <john@please.see.sig.for.email.com> wrote:
> >> Rich <rich@example.invalid> wrote:
> >> > beforewisdom@gmail.com wrote:
> >> > 
> >> >> Can anyone recommend any white noise software
> >> > 
> >> > sox has a large number of "noise" (both white and colored) options.
> >> > Here is one that someone posted somewhere on Usenet in the not too
> >> > distant past to generate brown noise:
> >> >   play -q -c 2 -n synth brownnoise band -n 1600 1500 tremolo .1 30
> > 
> >> Thanks, that works great. And I see from man sox (or man play)
> >> that output can be saved to a file. And I suppose it's got to be
> >> pretty obvious, but I'm not seeing (or getting it to work
> >> by messing around) exactly how to do that with your above example.
> >> That is, suppose I want to generate, say, a 1GB file containing
> >> the above, something functionally like the second line below...
> >>   play -q -c 2 -n synth brownnoise band -n 1600 1500 tremolo .1 30 \
> >>        --size 1GB --format mp3 -o brownnoise.mp3
> >> How would I correctly do that? Thanks again,
> > 
> > After many false starts (sox has a very convoluted CLI interface),
> > I found the "hint" in the docs to make it work:
> >   sox -q -c 2 -n out.wav synth brownnoise band -n 1600 1500 tremolo .1 30
> > Produces brownnoise in out.wav.

> Thanks so much, Rich. That works perfectly. I thought I'd looked at
> that -n in man sox, and it said null device/file. Seems weird that
> it works, but maybe I shouldn't be asking too many questions:).

Sox has an odd ordering of parameters:

  sox [global stuff] [input file] [output file] [effects]

> > What it does not do is "stop" at a certain length. You could watch the
> > file in another window, and kill the sox command when the file reaches
> > the length you want. If you really want to directly output a specific
> > length, then this will work (sox will complain that the wav header
> > length value will be incorrect, but the file seems to play anyway):
> >    sox -q -c 2 -n -t wav - synth brownnoise band -n 1600 1500 tremolo .1 30
> >    | dd of=out.wav bs=1024 count=1000
> > bs = block size
> > count = number of blocks
> > So total size is bs*count, adjust to the size you wish to obtain.

> Thanks, again. Kind of "my bad" about that size thing, which I just
> threw in without thinking much. Very sorry if it made you work more.

Nah, how to "get X amount" was the easy part, once I figured out how to
get it to "write to a file".  I'd already encountered the hyphen for
stdout (which is quite common) in the manpage.  So once I knew where
the output file needed to be, clipping the result was easy.

> Ctrl-C is pretty much okay for me, or maybe --seconds for duration
> of play would've been a more sensible -switch.
>    By the way, I let it run for maybe ~10secs (on an i7-3770K), and
> out.wav contained ~448MB. I was curious to see if sox ended abruptly
> or terminated the file properly after Ctrl-C, but haven't listened
> all the way to the end yet:). Thanks,

^C likely results in a final sample that is clipped.  The "dd" method
wil clip the final sample also (unless you compute number of samples +
header byte lenght and set a specifc dd size first, or get very lucky
in your size choice).

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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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