To detect tones DTMF with terminal GSM (TC65)

[casebsantos]

Hello, everyone

I have a PIC that it is connected in a terminal TC65 of the Siemens, and then I ask: Exists the possibility of this terminal to detect originated tones DTMF, for example, of a cell phone, so that the PIC can interpret them?

[flash65]

Hi, i don't know the TC65 but i decode the DTMF tone normally with a external decoder IC "MT8870" and a PIC16F628 it's very easy if you want i can send the schematic.

regards

[bot400]

Using either an FFT or IIR filter will allow a software only decoding of DTMF

[EDSONCT]

TC65 doesn´t decode the DTMF, use  MT8870.
You can generated but ATDXXX command.
XXXX is the number you can generated

[margo]

the dtmf signals are not present on the terminal interface, just the audio output, cant get em via 'AT' commands

[casebsantos]

If this module had an audio exit of I would have eats to use the MT8870, would be more easy there. It is therefore that I am asking if exists another solution to detect signals DTMF. Some another tip?

[EDSONCT]

I heard about a way to use the output of PCM audio directly into a microcontroller, never saw it working.
Edson

[casebsantos]

I heard about a way to use the output of PCM audio directly into a microcontroller, never saw it working.
Edson

I still did not hear to speak of this Edson, but I will go to verify. It was valid for the tip.