Forums

Tone detection

Started by ma August 21, 2005
Hello,

    I want to detect telephone tomes such as dial tone, stuttered dial tone, 
busy tone, ring back tone.



My questions are:



1- I was successful in using Geortzel algorithm to detect DTMF tones. Can I 
use it to detect these tones?

2- If the answer to the above question is no, what is the best way to do 
this? Where can I find more information about it?

3- If the answer is yes, where can I find more information? How should I set 
up Goertzel to detect the tone? What is the minimum size of input signal 
assuming the sampling rate is 8KSPS.







Best regards




ma skrev:
> Hello, > > I want to detect telephone tomes such as dial tone, stuttered dial tone, > busy tone, ring back tone. > > > > My questions are: > > > > 1- I was successful in using Geortzel algorithm to detect DTMF tones. Can I > use it to detect these tones? > > 2- If the answer to the above question is no, what is the best way to do > this? Where can I find more information about it? > > 3- If the answer is yes, where can I find more information? How should I set > up Goertzel to detect the tone? What is the minimum size of input signal > assuming the sampling rate is 8KSPS.
This sounds a bit too much like homework to me...? Rune
Rune Allnor wrote:
> ma skrev: > >>Hello, >> >> I want to detect telephone tomes such as dial tone, stuttered dial tone, >>busy tone, ring back tone. >> >> >> >>My questions are: >> >> >> >>1- I was successful in using Geortzel algorithm to detect DTMF tones. Can I >>use it to detect these tones? >> >>2- If the answer to the above question is no, what is the best way to do >>this? Where can I find more information about it? >> >>3- If the answer is yes, where can I find more information? How should I set >>up Goertzel to detect the tone? What is the minimum size of input signal >>assuming the sampling rate is 8KSPS. > > > This sounds a bit too much like homework to me...?
True, particularly because anyone who has really successfully decoded DTMF would find these other tones pretty trivial. Regards, Steve
On Mon, 22 Aug 2005 08:53:40 +0800, Steve Underwood <steveu@dis.org>
wrote:

>Rune Allnor wrote: >> ma skrev: >> >>>Hello, >>> >>> I want to detect telephone tomes such as dial tone, stuttered dial tone, >>>busy tone, ring back tone. >>> >>> >>> >>>My questions are: >>> >>> >>> >>>1- I was successful in using Geortzel algorithm to detect DTMF tones. Can I >>>use it to detect these tones? >>> >>>2- If the answer to the above question is no, what is the best way to do >>>this? Where can I find more information about it? >>> >>>3- If the answer is yes, where can I find more information? How should I set >>>up Goertzel to detect the tone? What is the minimum size of input signal >>>assuming the sampling rate is 8KSPS. >> >> >> This sounds a bit too much like homework to me...? > >True, particularly because anyone who has really successfully decoded >DTMF would find these other tones pretty trivial.
Not neccesarily, one must detect cadence as well as (or even instead of - am I giving too much away?) frequency. Also, there's a collective phrase to describe these tones and their detection. Detecting them, AND distinguishing them from voice, is not really trivial, though it can be done reliably. So are we a tough crowd for questions that look like homework assignments, or what? :) I suppose this attitude is explained in the "How do you know it is right?" thread.
>Regards, >Steve
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