razorfrog

I've managed to get a "SkypeIn" phone number routed into Max, so when I dial a certain number, the call goes directly into the program. Using ideas from the built-in Dialer patch, I'm trying to get Max to detect tones coming in as audio - but I'm not quite sure how to do that. The dialer patch makes the tones using two sin waves, a digital signal that I need to match to an analog sound.

I think that there's two ways to go: try to turn the analog incoming sounds into an approx. sin wave, or record the tones to have 10 .aiff files that I can then try to match to?

I've managed to get a "SkypeIn" phone number routed into Max, so when I dial a certain number, the call goes directly into the program. Using ideas from the built-in Dialer patch, I'm trying to get Max to detect tones coming in as audio - but I'm not quite sure how to do that. The dialer patch makes the tones using two sin waves, a digital signal that I need to match to an analog sound. 

I think that there's two ways to go: try to turn the analog incoming sounds into an approx. sin wave, or record the tones to have 10 .aiff files that I can then try to match to? 

interacting-with-skype

> I've managed to get a "SkypeIn" phone number routed into Max, so 

> when I dial a certain number, the call goes directly into the 

> program. Using ideas from the built-in Dialer patch, I'm trying to 

> get Max to detect tones coming in as audio - but I'm not quite sure 

> how to do that. The dialer patch makes the tones using two sin 

> waves, a digital signal that I need to match to an analog sound.

> I think that there's two ways to go: try to turn the analog 

> incoming sounds into an approx. sin wave, or record the tones to 

> have 10 .aiff files that I can then try to match to?

You could try training bonk~ for that.. but I'm not sure how well it 

would work. You could pre-filter the signal with a band-pass around 

the dial-tone frequency range, to improve your results.

An FFT should give a reasonably clear pair of values (once you filter 

out any transients from the start/end of each tone). Maybe this is 

what bonk~ is doing anyway, I can't remember.

Or, a filter bank (fffb~ could be a good candidate) tuned to the dial- 

tone frequencies, which might be cheaper and will return a smaller 

Or, google and read up on how automated telephone switchboards do it.

> I've managed to get a "SkypeIn" phone number routed into Max, so  
> when I dial a certain number, the call goes directly into the  
> program. Using ideas from the built-in Dialer patch, I'm trying to  
> get Max to detect tones coming in as audio - but I'm not quite sure  
> how to do that. The dialer patch makes the tones using two sin  
> waves, a digital signal that I need to match to an analog sound.
>
> I think that there's two ways to go: try to turn the analog  
> incoming sounds into an approx. sin wave, or record the tones to  
> have 10 .aiff files that I can then try to match to?

You could try training bonk~ for that.. but I'm not sure how well it  
would work.  You could pre-filter the signal with a band-pass around  
the dial-tone frequency range, to improve your results.

An FFT should give a reasonably clear pair of values (once you filter  
out any transients from the start/end of each tone). Maybe this is  
what bonk~ is doing anyway, I can't remember.

Or, a filter bank (fffb~ could be a good candidate) tuned to the dial- 
tone frequencies, which might be cheaper and will return a smaller  
data-set to analyze.

Or, google and read up on how automated telephone switchboards do it.


If you're on mac, Peter Swinnen's externals include a "phone decoder", 

don't know how / whether it works though:

Here's a wikipedia page explaining one (fairly involved) approach to 

http://en.wikipedia.org/wiki/Goertzel_algorithm

> I've managed to get a "SkypeIn" phone number routed into Max, so when

> I dial a certain number, the call goes directly into the program.

> Using ideas from the built-in Dialer patch, I'm trying to get Max to

> detect tones coming in as audio - but I'm not quite sure how to do

> that. The dialer patch makes the tones using two sin waves, a digital

> signal that I need to match to an analog sound.

> I think that there's two ways to go: try to turn the analog incoming

> sounds into an approx. sin wave, or record the tones to have 10 .aiff

If you're on mac, Peter Swinnen's externals include a "phone decoder", 
don't know how / whether it works though:

Here's a wikipedia page explaining one (fairly involved) approach to 
DTMF decoding:

max wrote:
> I've managed to get a "SkypeIn" phone number routed into Max, so when
> I dial a certain number, the call goes directly into the program.
> Using ideas from the built-in Dialer patch, I'm trying to get Max to
> detect tones coming in as audio - but I'm not quite sure how to do
> that. The dialer patch makes the tones using two sin waves, a digital
> signal that I need to match to an analog sound.
>
> I think that there's two ways to go: try to turn the analog incoming
> sounds into an approx. sin wave, or record the tones to have 10 .aiff
> files that I can then try to match to?
>
>

I wonder what happened to Wojciech Kosma's Skype external?

Last version was max 4.5 (probably non intel), and it's not available

Last version was max 4.5 (probably non intel), and it's not available
at his new site www.WojciechKosma.com

Interacting with Skype