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)

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

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)

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