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### sp09_lab2

Course: EE 265, Fall 2009
School: Missouri S&T
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Word Count: 271

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#2 Laboratory Due no later than February 6, 2009 When you press a number button on the telephone, it generates the sum of two sine waves. The frequencies of the sine waves are different depending on which key you press. This method of dialing the phone was advertised as &quot;touch tone&quot; dialing - although in the industry it is more commonly known as Dual Tone Multifrequency (DTMF) signaling. You can...

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#2 Laboratory Due no later than February 6, 2009 When you press a number button on the telephone, it generates the sum of two sine waves. The frequencies of the sine waves are different depending on which key you press. This method of dialing the phone was advertised as "touch tone" dialing - although in the industry it is more commonly known as Dual Tone Multifrequency (DTMF) signaling. You can find the frequencies for each button by searching the net with terms such as DTMF. Write a Matlab script that can dial any phone number. Start the script by defining an array, which contains the phone number, something like this: phone_number=[3418333] In the main part of your Matlab script, read each of the digits, generate a sum of sine waves at the appropriate frequencies, store and the resulting waveform in an array. As you read in each new digit, add those sine waves to the end of the waveform array. You may need to insert a bit of silence between the tones (to simulate you moving your finger from one button press to the next). When you are all done with the script, play the resulting waveform file out through your PC's speakers. If you hold a telephone headset up to your PC speakers, you should be able to dial the phone. Be c...

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