Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!us.feeder.erje.net!bloom-beacon.mit.edu!bloom-beacon.mit.edu!panix!not-for-mail
From: JohnF <john@please.see.sig.for.email.com>
Newsgroups: comp.os.linux.misc
Subject: Re: White Noise Software For Linux
Date: Wed, 8 Oct 2014 03:18:26 +0000 (UTC)
Organization: PANIX Public Access Internet and UNIX, NYC
Lines: 33
Message-ID: <m12ae2$5u6$1@reader1.panix.com>
References: <0eb566bb-5d54-47fd-b24a-53b85abda9ed@googlegroups.com> <lvm7ac$fv6$1@speranza.aioe.org> <lvmh1m$7uv$1@dont-email.me> <m0konm$ipq$1@reader1.panix.com> <m0mcd2$jhm$1@dont-email.me>
NNTP-Posting-Host: panix3.panix.com
X-Trace: reader1.panix.com 1412738306 6086 166.84.1.3 (8 Oct 2014 03:18:26 GMT)
X-Complaints-To: abuse@panix.com
NNTP-Posting-Date: Wed, 8 Oct 2014 03:18:26 +0000 (UTC)
User-Agent: tin/2.0.0-20110823 ("Ardenistiel") (UNIX) (NetBSD/6.1.4 (i386))
Xref: csiph.com comp.os.linux.misc:12228

William Unruh <unruh@invalid.ca> wrote:
> JohnF <john@please.see.sig.for.email.com> wrote:
>> <<snip>> suppose I want to generate, say, a 1GB file containing
>> 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,
> 
> man sox. Look up the synth option. Note the len argument to synth.
> Guessing what the syntax is is a fools game. You will never get it
> right. 

Thanks, William, len seems to be the most straightforward solution,
as far as I can tell. From line 2868 of the (Feb 1, 2013) sox man page
         len  is the length of audio to synthesise expressed as a
         time or as a number of samples; 0=inputlength, default=0.
Re "getting it right", yeah, sox's (Feb 1, 2013) man page
has 3264 lines on my box, many of which remain a bit cryptic to me.

And Loki Harfagr also followed-up...
> Loki Harfagr <l0k1@thedarkdesign.free.fr.invalid>
> regarding your "^C Vs length" problem ;-)
> in Sox to fix a length I'd use 'trim', e-g for a 1 min 12 secs of your exp:
> $ sox -q -c 1 -n white.wav synth noise band -n 24 800 echo .1 5 1 .99
>   trim 0 01:12

Thanks, Loki. That seems just about equally straightforward, i.e.,
from line 3024 of the (Feb 1, 2013) sox man page
         For example,
            sox infile outfile trim 0 10
         will copy the first ten seconds, while
-- 
John Forkosh  ( mailto:  j@f.com  where j=john and f=forkosh )