Get the right order of tones for DTMF decoder

I'm trying to decoder stream DTMF signal (contains mutiple tones, delay, noise), however, I have the problem to separate each tone of the stream signal in order to enter the Goertzel for later analysis.

The phone number is 534-343-3436. To the decoder input, I don't know what's the phone number again. However, I want to separate 5 then 3 then 4 then 3... your if I put analysis individual tone is what key corresponding to this phone number.

Anyway I can archieve in LabView?

There should always be an interval of no signal between pairs of tone - if not, you can not detect repeating values. For phone number 534-343-3333 you can not just look for a frequency change. Your signaling protocol must specify the minimum length of a pair of tone to be considered a valid signal and a minimum without your being a separation valid between the numbers. Maximum number of hours is useful, but not as important, except to determine how long the system will wait for a valid number.  Time settings may depend on the acceptable minimum signal to noise ratio.

The algorithm would be something like this: amplitude discrimination allows to find gaps between pairs of tone. There is no need to be too good - just find approximate segments. It will use timing specifications for set time periods to consider. Within each segment threshold use the FFT to identify the pair of tone. You can also use a FFT on the gap segments to check that they do not contain a pair of tone.

Also consider various errors. On tampons in your Western Electric simultaneously pressing two or more keys in a row or a column results in a single tone. I have not watched the DTMF generators for a few years so I don't know how how some of the IC-based generators to handle this situation.

Lynn

Tags: NI Software

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