[App_rpt] irlp audio vs asterisk audio (channel drivers)
Ramesh Dhami (VA3UV)
Ramesh at va3uv.com
Thu Oct 30 15:31:50 EDT 2008
James Nessen wrote:
> I recently setup a node for a buddy of mine and we moved him to the
> channelized irlp and echolink installation. He has recently received
> poor audio reports from the IRLP side of his node and we did a A/B test
> one night on his audio.
> I found that his Asterisk audio is great, and is full of audio (our two
> nodes connected via uLaw). leaving the volume on my HT, I disconnect
> from him via AllStar and then connect up to him via IRLP. His audio on
> the IRLP side is about 10% lower than his level when were chatting via
> AllStar and also sounds muffled. Has anyone else noticed this? If so,
> is there a fix for it?
<-- Hi Jim; I have also noticed this on my chan_irlp node (2304). I
believe part (if not all) of the issue is due to the fact that app_rpt
and irlp use different audio levels as the calibration standard (3.2kHz
and 3.5kHz deviation respectively). Of course then there is the ADPCM
to ulaw conversion...
I have previously discussed this with Jim (WB6NIL); I know that he'll
come up with a fix!
app_rpt node 2182
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