On 28 Jun 2006, at 19:50, Douglas Garstang wrote:
-----Original Message-----
From: Doug Lytle [mailto:[EMAIL PROTECTED]
Sent: Wednesday, June 28, 2006 12:31 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] Standard Sound Files Distortion
Douglas Garstang wrote:
I've been noticing lately what seems to be some distortian
in the standard asterisk sound files, used for voicemail.
These files are stored on the local Asterisk system. When
Asterisk plays them, I can hear some cracles and pops. I'd
never noticed these until recently.
What I've learned from reading the list, is it usually is a sign of
shared IRQs. Just a thought.
Thanks for the reply. I just worked out what it was. I had ulaw
copies of all the sound files in the digits/ directory. For some
reason, the ulaw files either had the cracks and pops in the
recordings, or when asterisk played the ulaw files, it generated
the cracks and pops.
I've noticed something that may (or may not) be related.
If you have a sound file that isn't an exact multiple of 20ms long,
then asterisk 1.2.9.1 (don't know about other versions - yet) sends
out a 'partial' packet with the remaining data in it. For ulaw,
the data would normally be 160 bytes, but a few (the last?) packet(s)
might be 54 bytes (or whatever). This confuses my softphone.
Do we think this is correct behavior ? Shouldn't
asterisk pad the sound out to 20ms?
Note - this never occurs with GSM data, like the
'standard' voice files, as gsm is always a multiple of
20ms long.
T.
Tim Panton
[EMAIL PROTECTED]
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