A dual-tone multi-frequency (DTMF) system is used to produce signals that represent the dialed digits in a telephone system. A combination of a horizontal frequency and a vertical frequency is produced whenever a button is pressed on the keypad. The figure below shows a telephone keypad and the different frequencies used. 697 Hz 770 Hz 852 Hz 941 Hz 1209 Hz 1 4 7 1336 Hz 2 1477 Hz 3 5 6 8 9 # 0 * Generate the DTMF tone decoder that will take an audio file the DTMF signal of your student number. The student number must be presented as one complete string (e.g. 2020123456)

A dual-tone multi-frequency (DTMF) system is used to produce signals that represent the dialed digits in a telephone system. A combination of a horizontal frequency and a vertical frequency is produced whenever a button is pressed on the keypad. The figure below shows a telephone keypad and the different frequencies used. 697 Hz 770 Hz 852 Hz 941 Hz 1209 Hz 1 4 7 1336 Hz 2 1477 Hz 3 5 6 8 9 # 0 * Generate the DTMF tone decoder that will take an audio file the DTMF signal of your student number. The student number must be presented as one complete string (e.g. 2020123456)

C++ Programming: From Problem Analysis to Program Design

8th Edition

ISBN:9781337102087

Author:D. S. Malik

Publisher:D. S. Malik

Chapter2: Basic Elements Of C++

Section: Chapter Questions

Problem 24PE: 24. A piece of wire is to be bent in the form of a rectangle to put around a picture frame. The...

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Design, implement and test a C# console app that prompts the user to enter an 8-digit number that represents a passcode. The program indicates whether the number is a valid passcode. A passcode is valid if: -- it has 8 digits -- the number-A (first 4 digits) is exactly 2.5 times the number-B (last 4 digits) For example: 30301212 is valid because 3030 is equal to 2.5 times 1212.
3. A dual-tone multi-frequency (DTMF) system is used to produce signals that represent the dialed digits in a telephone system. A combination of a horizontal frequency and a vertical frequency is produced whenever a button is pressed on the keypad. The figure below shows a telephone keypad and the different frequencies used. 697 Hz 770 Hz 852 Hz 941 Hz 1209 Hz 1 4 7 # 1336 Hz 2 5 8 0 1477 Hz 3 6 9 * Generate the DTMF tone of your student number. Each digit must have a duration of one second (1 s) with a half a second (0.5 s) pause (silence) in between digits. Save your DTMF tones. MATLAB code (Editor):
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