dtmf example
in [LabView]
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From: Mudassar Mehboob on 9 Jun 2006 06:10 Hi I want to decode DTMF from the anlog input acquired by a NI DAQ. can any one help me with an example or with some thing very descriptive and comprehensive because i m new to labview and this would be a great help for me to start. Regards Mudassar Mehboob
From: Mudassar Mehboob on 12 Jun 2006 01:40 Hi Reading the data from DAQ and taking its fourier transform is ok i have got no difficulty up to this step. The problem arises how to pick that data up from the FFT block and display it on something like a seven segment display or to store it in some variable. Hope you understand and help Thanks in advance for your help Regards Mudassar Mehboob
From: bjorn1985 on 12 Jun 2006 02:40 I don't want to give too much information here :smileywink:but try to convert the Fourier waveform to an array and find the highest signal. Compare the array to the waveform as I have had some difficulties with this conversion. Then, you can compare the frequency you've found to the DTMF frequencies.
From: Mudassar Mehboob on 12 Jun 2006 03:40 Thanks for your reply just tell me one thing i have searched the discussion forum with they keyword dtmf. I have found that there is an example vi named as simphone.vi could u please tell me where is it exactly located in the labview directory because i have searched for it but i could'nt find it out. hope you wont feel (uuhh! these begginers ask too much questions) Regards
From: David Crawford on 12 Jun 2006 04:10 Mudassar Mehboob Don't worry about that. We were all beginners at some point. I couldn't find Sim Phone in LV8.0 but it was there in LV7.1 so I bundled it into a .llb for you. I also found DTMF_decode.zip on my PC. I must have picked it up from somewhere. Its for a sound card but you should be able to adapt it to use your DAQ card. In the end I bought one of these <a href="http://209.51.151.50/ASCIItoDTMF.html" target="_blank">http://209.51.151.50/ASCIItoDTMF.html</a> to handle DTMF comms. Made life much easier for me at the time. Never looked back.:smileyvery-happy: David DTMF_Decoder.zip: http://forums.ni.com/attachments/ni/170/189362/1/DTMF_Decoder.zip Sim Phone.llb: http://forums.ni.com/attachments/ni/170/189362/2/Sim Phone.llb
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