Loud pop at the end of messages causing levelproblems

2 msg	Cisco config 7940 via telnet
3 msg	R: Intercept Hangup

Loud pop at the end of messages causing levelpr...
\ Eric Deutsch (16 Oct 2007)
. \ Stephen Bosch (17 Oct 2007)
. . \ Brian West (17 Oct 2007)

3 msg	Control space of each voicemail box
1 msg	DUNDI
4 msg	Stupid Question #1 - Testing the 's' exten from...
10 msg	Re: phone as control interface (was 99bottlesof...
7 msg	asterisk at non-root / zaptel
27 msg	What web GUI are people happy with?
1 msg	Answering Machine Detection
1 msg	CDR MERGING
1 msg	Announce: Blindside Project
12 msg	PSTN failover
4 msg	Voicemail issues in 1.4.11
2 msg	Conference Calls with single-line SIP
1 msg	Trade T1/PRI Card for 4 Port FXO Card
1 msg	Problems with voice lag/delay
1 msg	Proxy Authentication on Colinux
1 msg	Cannot create socket error
1 msg	Re: [asterisk-dev] About Ringing Time out

Subject:	Loud pop at the end of messages causing levelproblems
Group:	Asterisk-users
From:	Eric Deutsch
Date:	16 Oct 2007

Hi everyone, I've set up a little Asterisk system with a Digium TDM400P and
everything works splendidly except for the messages callers leave. Every
message that a caller leaves is very faint. I've already set volgain=6.0 in
voicemail.conf, and that seems better, but to be at a good volume I estimate
I may need to go up to 40.0. Is that reasonable?

One interesting artifact is that at the end of every message, there is a
loud pop (I think I usually hear a faint click when the caller hangs up and
then I surmise that the loud pop is some sort of local connection ending.
If I do:

sox msg0004.WAV zz1.WAV stat

it always tells me that the volume correction should be 1.0000. I surmise
that the volume peak is triggering on this loud pop. In fact if I trim off
the pop with something like:

sox msg0004.WAV zz1.WAV trim 0 00:00:15 stat

Then it tells me that the volume gain should be between 7 and 12 depending
on the message.

So here are the questions:

1) Is there anything simple I can do to stop this loud pop at the end of
every message?

2) Failing that, is there a way that I can shell out to some post processing
on the message easily after it is left?

I assume that Asterisk already does some processing with sox; this is where
the volgain goes. Can I instead insert some logic like:

- trim the last half-second off the message

- Do a sox stat to determine the suggested gain

- Use sox to readjust the gain

I could script this up if I knew how Asterisk would call my script.

Or, perhaps there is another solution I am not considering.

Any help would be most appreciated.

Thanks,

Eric

_______________________________________________
--Bandwidth and Colocation Provided by http://www.api-digital.com--

asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
http://lists.digium.com/mailman/listinfo/asterisk-users