ABSTRACT
The objective of this project is to design an embedded system which can control appliances remotely. This project is designed to study the basic implementation of DTMF (Dual Tone Multi Frequency).
The DTMF signal is composed of high frequencies & low frequencies. Each key is assigned a low frequency and a high frequency. When a particular key is pressed, the frequencies those are specific to that particular key are transmitted. Therefore, no two keys will have a same set of low & high frequencies ....etc

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To get full information or details of sms on landline telephone please have a look on the pages

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to get information about the topic gsm based patient monitoring system full report ppt and related topic refer the page link bellow

http://seminarsprojects.net/Thread-patient-monitoring-system-to-remote-doctors-using-gsm-and-zigbee-technology

http://seminarsprojects.net/Thread-ip-based-patient-monitoring-systems

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To get full information or details of railway ticket reservation through sms please have a look on the pages

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http://seminarsprojects.net/Thread-improved-railway-ticketing

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implimentation of landline switching system using vhdl

A landline telephone (also known as land line, land-line, main line, home phone, landline, fixed-line, and wireline) refers to a phone that uses a metal wire or fibre optic telephone line for transmission as distinguished from a mobile cellular line, which uses radio waves for transmission. In 2003, the CIA reported approximately 1.263 billion main telephone lines worldwide. China had more than any other country at 350 million and the United States was second with 268 million. The United K ....etc

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architectural diagram for student details through sms ....etc

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to get information about the topic landline telemetryfull report ppt and related topic refer the page link bellow

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SMS through Telephone using AT89S8252
This system can transmit message or text through ordinary Land Line Telephone from one end (source) to another end (designation). The tecnology used is the DTMF(Dual Tone Multiple Frequency). technology. The system has two sections one for editing the text and to transmit the edited text and the other section consist for receiving the text message.There are several steps for this project:
* DTMF decoding/Encoding process
* Ring sensing
* ON/OFF hook detection
* Displaying the message in LCD
T ....etc

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