[Asterisk-Users] Asterisk Indications

[Steve Underwood]

Hi Chris,

Matching the tones isn't hard, if you have the right tools. :-)

Try the free sound editor you will find here  -> 
http://www.speech.kth.se/wavesurfer/ Record some of the tone you are 
interested in. Then use wavesurfer to look at it. Choose the n-waveforms 
view. Left click over the waveform and mark out a chunk of the recording 
you are interested in. Then right click over the waveform and choose 
"spectrum  section". This will show a spectrum analysis of the sound in 
the section you marked. This may not initially give enough resolution to 
pinpoint the exact frequency of the tones. Click on the "FFT points" 
box, and set the number of points to a higher value. You should then 
have the resolution you need.

Regards,
Steve


Christopher Lee wrote:

>I've had a closer listen to 400*17 through the handpiece rather than just on
>speaker phone, and I get the feeling that the Australian ringing tone must
>have been tweaked slightly, perhaps with the introduction of the newer
>Ericsson AXE exchanges?
>
>400*17 sounds familiar, perhaps the older exchanges (cross-bar?) used that
>format?
>
>That said, the 400+420 isn't exactly how my current exchange sounds, but
>sounds good to me anyway :-)
>
>I'm looking at tweaking the sounds somewhat more and moving away from the
>exchange sounds... I'd actually like to get it sounding more like a Nortel
>Meridian system, but I don't yet have any example rings to work off to try
>and get it similar sounding.
>
>  
>
>>-----Original Message-----
>>From: asterisk-users-admin at lists.digium.com [mailto:asterisk-users-
>>admin at lists.digium.com] On Behalf Of Steve Underwood
>>Sent: Sunday, 25 January 2004 4:17 PM
>>To: asterisk-users at lists.digium.com
>>Subject: Re: [Asterisk-Users] Asterisk Indications
>>
>>The correct tone is 400*17 (383 + 417) according to the ITU specs.
>>
>>Actually, nothing would use a 17Hz tone - it doesn't pass through a
>>300-3400Hz channel very well :-)
>>
>>Regards,
>>Steve
>>
>>    
>>
>
>
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