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
Tone detection
Started by ●August 21, 2005
Reply by ●August 21, 20052005-08-21
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
Reply by ●August 21, 20052005-08-21
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
Reply by ●August 24, 20052005-08-24
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----- http://www.mindspring.com/~benbradley