Fwd: Re: Playing tone through speakers
Andor Demarteau
andor at nl.linux.org
Sat Jan 22 19:59:54 UTC 2005
press ctrl+g to get a bell.
or you may want to use the unixcw package (which actually does to
morse-code)
On Sat, 22 Jan 2005, Thomas Stivers wrote:
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> - ----- Forwarded message from Sam Watkins <swatkins at fastmail.fm> -----
>
> From: Sam Watkins <swatkins at fastmail.fm>
> Subject: Re: Playing tone through speakers
>
> I thought you might find this interesting.
>
> On Fri, Jan 14, 2005 at 01:19:20PM -0600, Michael Satterwhite wrote:
> > So the correct question would be: Does anyone know of a utility that
> > would play a continuous tone of a specified frequency through the
> > speakers attached to my SoundBlaster Live?
>
> Yes, I wrote one, it's called "bell". It's OSS specific at the moment,
> but I suppose it would work with ALSA's OSS emulation.
>
> http://nipl.net/hacks/
>
> It's written in my C dialect, which has a python-like syntax, and uses
> some libraries I wrote. Here is the source code:
>
> http://nipl.net/hacks/bell.b
>
> I wrote a program yesterday to automatically make standalone source
> files so I wouldn't have to burden you with my libraries. Here is the
> source code including the bits of my libraries it needs:
>
> http://nipl.net/hacks/bell.b1
>
> Here is the C translation, this is the one you'll need if you want to
> compile it yourself:
>
> http://nipl.net/hacks/bell.c
>
> And here is an i386/linux elf executable:
>
> http://nipl.net/hacks/bell
>
>
> To compile:
>
> gcc -Wall -lm bell.c
>
> Usage:
>
> bell <freq> <amplitude> <duration>
>
> Examples:
>
> bell 440 1 1
>
> gives an A440 tone at max volume for 1 second.
>
> bell 220 0.5 0.1
>
> gives an A220 tone (one octave lower) at half volume for 0.1 second.
>
>
> If you are musically inclined, you might want to do something like this
> to use semitones instead of hertz (beware, perl code):
>
> sub bell {
> my ($pitch, $duration, $volume) = @_;
> $volume = $ENV{bell_volume} if @_ == 2;
> my $freq = 440 * 2 ** ($pitch / 12);
> system("bell", $freq, $volume, $duration);
> }
>
> I should probably modify the bell program to do this itself.
>
>
> I wrote this bell program as part of my "voice editor", "ved", which is
> intended for blind people to record and edit speech, or for people to
> record audio-books, or for children who have trouble writing or typing
> to be able to record stories for school then write them down later.
> I found it was quite good for recording a diary too.
>
> It allows you to record your speech, automatically splits the recorded
> sound into sentences and omits stretches of silence. You can browse
> back and forth and change things, insert new recorded speech, etc., play
> back the recording at various speeds (using sox), structure your work
> into paragraphs and chapters and browse around a paragraph or chapter at
> a time, etc. I wrote it for my grandmother who cannot see very well.
>
> I intend to release "ved" as free-software, would anyone be interested
> in using it when I do?
>
>
> - --
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>
>
> - ----- End forwarded message -----
>
> - --
> "Debugging is twice as hard as writing the code in the first place.
> Therefore, if you write the code as cleverly as possible, you are,
> by definition, not smart enough to debug it." - Brian W. Kernighan
>
> Thomas Stivers e-mail: stivers_t at tomass.dyndns.org
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--
Andor Demarteau E-mail: andor at nl.linux.org
student computer science www: http://www.nl.linux.org/~andor
UU based & VU guest-student jabber,icq,msn,voip: do ask ;)
-----------
chairman Stichting Studiereizen Storm 2002-2004
vice-chairman USF Studentenbelangen executive committee 2002-2003
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