Very specific question ...

I have a recording of the beep from an answer machine and need to identify what tone is being produced.

It there something I can play the sound into which will do this?


To narrow it down, I am pretty certain it is a DTMF because it is fucking with a system designed to only acknowledge DTMF.

Go forum!


Peace,

kowalski

Do you mean what note the pitch is or what frequency?

I'm not sure, man.

Basically we have a system that looks for the customer pressing any button on their telephone keypad.

There is a specific answer machine that makes a beep which tricks the system as it is in the same range as a telephone button key press.

We have a recording of this beep and want to know the 'tone' so we can adjust the system to ignore them.

That is all I know at the moment.

Do I need to find out more stuff first?


Peace,

kowalski

well the if your adjusting a system.... ur gonna need to find whta its programmed to read... TONALITY is a desctiptive word i.e. warm tone, thick tone etc

ur program will listen to the tones key or specific frequencies. if you find out how it collects the info. send me the tone and i can put it into logic for u and ill send it so one of my mastering friends. They can hear a tone & know its key & freq rangs instantly (golden ears test in college)

after further inquiries. aparently the rows pick up hig frq & the colomn picks up low..

so your tone is a correlation of 2 freq. send me it and ill pick out the peak points on my eq.

ur problem there is by ignoring it! you will ignore all others that use the same range. you would have to specify

when freq ranges are x & y but u run the risk of causing more problems if frq are generic..

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

You want to know the frequency.

Telephone keypads make DTMF sounds.
This means Dual Tone Multi Frequency.

Two Tones at different frequencies per number on the keypad.
To find out which frequencies relate to which keys, see the wikipedia article.

To find out what frequencies are in your recording use any of the following programs, find the FFT function and look at the resulting graph.

Programs: Adobe Audition, Logic, Ableton, Spectragraph, Matlab.
Send on the recording if you don't have any of these.

Cool, I don't have that software available to me. Here is the .wav file - http://tinyurl.com/3l8gua3

The beep is at about 0:13.

It sounds like the # key. We currently ask the customer, at this point, to 'press any key'. So we can narrow that to 'press any number' or just 'press one'.


Peace,

kowalski

wont let me open that file on anythin... can u save it as an mp3

Yeah, I suppose .wav is practically defunct nowadays.

I'll try convert it.


Peace,

kowalski

I can open it fine. The two tones are (approx) at the following frequencies: 941Hz and 1477Hz

Its the Hash Key.

Sweet as fuck, man.

Thank you.


Peace,

kowalski