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decoder

Tutorial: Interfacing Encoder/Decoder with RF Module

Contributor: 
Ganeev Singh

In this project I have also used the RF (Radio Frequency) Modules to transfer data from Encoder to Decoder wirelesslyFor wireless communication we always require a Tx (transmitter) and Rx (receiver). Image below shows you both of them:

These modules are really simple to deal with. They just require a VCC (+5V), GND (0V) and the DATA connection. Some of them require ANTENA (ANT) connection as well. 

DTMF Decoder

Summary

By: 
Himanshu Choudhary
 
DTMF (Dual tone multiple frequency) is the most popular and nowadays ubiquitously used telecommunication signalling method. A DTMF decoder detects the DTMF tones and generates the binary sequence corresponding to key pressed in a DTMF keypad. The circuit of this project presented here is a DTMF decoder. DTMF keypads are used in almost all landline and mobile handsets. The DTMF decoders, therefore, are used at the telephone switching centres to detect the number dialled by the caller. The DTMF version used in pushbutton telephones is called touch tone and is a registered trademark of AT&T.

Description

DTMF (Dual tone multiple frequency) is the most popular and nowadays ubiquitously used telecommunication signalling method. A DTMF decoder detects the [[wysiwyg_imageupload::]]DTMF tones and generates the binary sequence corresponding to key pressed in a DTMF keypad. The circuit of this project presented here is a DTMF decoder. DTMF keypads are used in almost all landline and mobile handsets. The DTMF decoders, therefore, are used at the telephone switching centres to detect the number dialled by the caller. The DTMF version used in pushbutton telephones is called touch tone and is a registered trademark of AT&T. The tones generated from the speaker (audio signals) of keypad are given to microphone which converts audio tones into electrical signals. The signals from the microphone are processed by the DTMF decoder IC which generates the equivalent binary sequence as a parallel output.

Circuit Diagram

Components

HT9170 DTMF Decoder IC Image
HT9170
 
HT9170 is the series of Dual Tone Multi Frequency (DTMF) receivers. They employ digital counting techniques to detect and decode the 16 DTMF ton...

Step-By-Step

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