[Asterisk-Users] feature - VM gain adjust?

[William Suffill]

Normalize for Linux can tell you the levels of a wav and can be used
to adjust it according.

Been toying with using it for some of my streaming media clients since
it sucks to go from too low and having to up the volume to very loud.


On Mon, 12 Jul 2004 10:31:08 -0400, Seth Remington
<sremington at saberlogic.com> wrote:
> What about a "post processor" that performs Compression/Normalization on
> the recorded voice mail file?
> 
> On the down side I can see this being a big CPU hog if you are handling
> a huge amount of calls and trying to normalize a 5 minute long voicemail
> at the same time.
> 
> On the upside you don't have to concern yourself determining line loss
> or similar things. You also wouldn't have to worry about what I call the
> "Seinfeld Syndrome": quit talker / loud talker issues. You would just
> have two new variables in voicemail.conf - normalization=yes or no and
> another to set the db value.
> 
> -Seth
> 
> 
> 
> On Mon, 2004-07-12 at 08:46, Rich Adamson wrote:
> > > > Are you suggesting such a thing exists, or that that would be a
> > > > proposed future application?
> > >
> > > I propose to think if an AGC / dynamic compressor could be used instead of
> > > a config variable.
> > >
> > > Most sound editors have modules for this.
> >
> > So how would you detect the remote caller is 14.7 db away from *
> > and adjust the 'outbound' voice message to be at some higher
> > audio level?
> >
> > I like the AGC approach, but I'm not sure its realistic in terms of
> > consistently being able to identify the transmission loss from
> > each and every vm call. Since we know what the loss is for each
> > pstn line (to the central office), it would appear that static
> > value would be a good starting point and the user could adjust from
> > there. Much easier (and more likely) to implement.
> >
> >
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> --
> Seth Remington
> SaberLogic, LLC
> 661-B Weber Drive
> Wadsworth, Ohio 44281
> Phone: (330)335-6442
> Fax: (330)336-8559
> 
> 
> 
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