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.
Reply by Steve Underwood●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 Rune Allnor●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 ma●August 21, 20052005-08-21
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