asterisk users - Jul 2004 - Audio filters (was: feature - VM gain adjust?)

At 11:08 AM -0500 7/12/04, Steven Critchfield wrote:
>[snip]
>
>Would it be something people would like to be able to add filters to a
>line? Consider normalization as a filter. Monitor could then be moved to
>a filter as well. Echo cancel could be a filter. Set it up so multiple
>filters could be added and chained together. This could help those with
>echo chain a couple of filters together and see if that helps.
>
>--
>Steven Critchfield  <critch@basesys.com>

This is an excellent idea, and is extendable outside of the narrow 
scope of audio quality improvement.  I was playing with this concept 
a while back, and trying to find programmers for a few ideas I have. 
I'll air them here, so I can take some credit for being the first 
clever monkey to publicly talk about integration into Asterisk (or 
any other VoIP system, as far as I know):

  - voice disguise/modulation.  Think about how many customers you'd 
get with a module that sounds like they're Mickey Mouse.  You think: 
'That's really stupid!' but then look at how many people pay for 
Usher ringtones.  Look at how many crazy truckers buy CB microphones 
with reverb.

  - voice stress analysis.  If you're dumping the audio through a 
filter, there's no reason you can't simply extract data from it 
instead of alter the audio path.  A one-way background audio carrier 
tone to the listener might change pitch during stress events.

  - customized background noise.  This is apparently already the rage 
in Asia somewhere with some cell phone carriers - insertion of 
background sounds customized to the user's tastes (forest, 
construction site, bar, office environment, airport, etc.) which can 
be used for either pleasant diversion or for disguise of location.

I have a few more, even, but as is typical, these will remain on the 
drawing board until someone coughs up some dough to make them happen. 
No time, no time, no time...

JT

The customised background noise idea rocks. 

Cheers,
Dean


-----Original Message-----
From: asterisk-users-admin@lists.digium.com
[mailto:asterisk-users-admin@lists.digium.com] On Behalf Of John Todd
Sent: Tuesday, 13 July 2004 5:45 AM
To: asterisk-users@lists.digium.com
Subject: [Asterisk-Users] Audio filters (was: feature - VM gain adjust?)

At 11:08 AM -0500 7/12/04, Steven Critchfield wrote:
>[snip]
>
>Would it be something people would like to be able to add filters to a
>line? Consider normalization as a filter. Monitor could then be moved
to
>a filter as well. Echo cancel could be a filter. Set it up so multiple
>filters could be added and chained together. This could help those with
>echo chain a couple of filters together and see if that helps.
>
>--
>Steven Critchfield  <critch@basesys.com>

This is an excellent idea, and is extendable outside of the narrow 
scope of audio quality improvement.  I was playing with this concept 
a while back, and trying to find programmers for a few ideas I have. 
I'll air them here, so I can take some credit for being the first 
clever monkey to publicly talk about integration into Asterisk (or 
any other VoIP system, as far as I know):

  - voice disguise/modulation.  Think about how many customers you'd 
get with a module that sounds like they're Mickey Mouse.  You think: 
'That's really stupid!' but then look at how many people pay for 
Usher ringtones.  Look at how many crazy truckers buy CB microphones 
with reverb.

  - voice stress analysis.  If you're dumping the audio through a 
filter, there's no reason you can't simply extract data from it 
instead of alter the audio path.  A one-way background audio carrier 
tone to the listener might change pitch during stress events.

  - customized background noise.  This is apparently already the rage 
in Asia somewhere with some cell phone carriers - insertion of 
background sounds customized to the user's tastes (forest, 
construction site, bar, office environment, airport, etc.) which can 
be used for either pleasant diversion or for disguise of location.

I have a few more, even, but as is typical, these will remain on the 
drawing board until someone coughs up some dough to make them happen. 
No time, no time, no time...

JT

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Hiya,
>This is an excellent idea, and is extendable outside of the narrow scope of 
>audio quality
>improvement.  I was playing with this concept a while back, and trying to 
>find programmers for a
>few ideas I have. I'll air them here, so I can take some credit for
being
>the first clever monkey to
>publicly talk about integration into Asterisk (or any other VoIP system, as 
>far as I know):
>- voice disguise/modulation.  Think about how many customers you'd get
with
>a module that
>sounds like they're Mickey Mouse.  You think: 'That's really
stupid!' but
>then look at how many
"Please press 7 for Darth Vader"  -- "I am your father,
Luke" :-D
>- voice stress analysis.  If you're dumping the audio through a filter, 
>there's no reason you can't
>simply extract data from it instead of alter the audio path.  A one-way 
>background audio carrier
>tone to the listener might change pitch during stress events.
Is there allready some application to do a voice stress analysis? I guess 
developing something
like this from scratch would be very hard...
>- customized background noise.  This is apparently already the rage in Asia 
>somewhere with some >cell phone carriers - insertion of background sounds
>customized to the user's tastes (forest, >construction site, bar,
office
>environment, airport, etc.) which can be used for either pleasant 
> >diversion or for disguise of location.
yeah, this would rock. "Honey, i've to stop talkin', the Dentist
want's to
start drilling". For some
Cellphones, this allready exists: http://www.simeda.com/soundercover.html

This could also be used to do (MusicDuringCall. Get a call from the army and 
you play
"Status Quo"
(http://www.france-jeunes.net/paroles/index.php?tid=MTkwOTQ=)
:-)
>I have a few more, even, but as is typical, these will remain on the 
>drawing board until someone >coughs up some dough to make them happen. No
>time, no time, no time...
Hey, no normal person uses asterisk at home anyway, so there HAS to be some 
geek out there who
also wants this AND can code :-D


Bye

Andreas

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On Tue, 2004-07-13 at 07:11, Holger Schurig wrote:
> > liarliar.sourceforge.net gives you something, its still in
development.
> 
> Hehe, imagine a phone where you see a red LED flashing if the other person 
> lies to you.
> 
> 
> 
> When you thing about audio-plugins, you should think more into the 
> direction of LADSPA, see http://www.ladspa.org/
> 
> Amplifier: http://plugin.org.uk/ladspa-swh/docs/ladspa-swh.html#tth_sEc2.5
> Compressor: 
> http://plugin.org.uk/ladspa-swh/docs/ladspa-swh.html#tth_sEc2.35
> 
> There are possible others there as well.
While that would get quite a bit of plugins right away. It would need to
be looked over carefully to make sure every plugin being used and the
API is able to handle multithreading. Add to that, are the plugins fast
enough to not add much latency to the audio stream.
-- 
Steven Critchfield <critch@basesys.com>