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Date: Sun, 15 Jan 2006 17:25:13 +0800
From: Ariff Abdullah <ariff@FreeBSD.org>
To: "Michael W. Oliver" <michael@gargantuan.com>
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Cc: multimedia@FreeBSD.org
Subject: Re: cwpcm straight to dsp is way fast
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On Sun, 15 Jan 2006 03:54:56 -0500
"Michael W. Oliver" <michael@gargantuan.com> wrote:
> Hey guys,
>=20
> I am using cwpcm to generate morse, and when using this:
>=20
>   echo "sos sos sos" | cwpcm -w 20 -F 24 -f 800 | sox -r 8000 -bu -t
>   raw - sos.wav lowpass 1500
>=20
> I get a wav file that sounds perfect.  However, when using this:
>=20
>   echo "sos sos sos" | cwpcm -w 20 -F 24 -f 800 >/dev/dsp
>     -or-
>   echo "sos sos sos" | cwpcm -w 20 -F 24 -f 800 >sos.raw && cat
>   sos.raw >/dev/dsp
>=20
> I get horrible noise from speakers.  I am _guessing_ that it has
> something to do with the rate at which dsp is processing that raw
> data, but I don't know how to fix it so that I can just play the
> code without creating the wav file.
>=20
Since you have sox, how about something like this:

echo "sos sos sos" | cwpcm -w 20 -F 24 -f 800 | \
	play -b -u -r 8000 -t raw -


--
Ariff Abdullah
FreeBSD

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