[Asterisk-Users] Asterisk Native Sound Distortion (ulaw)
kris at krisk.org
Mon Sep 11 08:51:03 MST 2006
Tzafrir Cohen wrote:
> On Sat, Jul 01, 2006 at 01:29:30PM +0200, Paul Hewlett wrote:
>> Maybe on other distros the sound files are being read from an IDe disk and
>>the interrupts generated are distorting the sound - on astlinux the
>>soundfiles are in a memory filesystem - no interrupts - no distortion ?
> Bigger systems have large buffers.
> An hourly cron job to can the sound files you normally use to /dev/null?
Although tmpfs is used extensively in AstLinux, all of the sound
prompts are stored and read from disk. This issue has come up several
times, and I have no idea why they sound so much better in AstLinux.
Don't get me wrong - I'm glad they do, but they should work equally well
for all users of Asterisk, not just those that use AstLinux!
Actually, now that I think about it, AstLinux does have one crucial
difference. By default, DMA for IDE transfers are disabled (better
compatibility with compact flash - rather safe than sorry)... I should
try to enable DMA on a system that supports it and see what happens.
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