SYNOPSIS
Dual-tone Multi-Frequency (DTMF) signaling is the basis for voice communications control and is widely used worldwide in modern telephony to dial numbers and configure switchboards. It is also used in systems such as in voice mail, electronic mail and telephone banking.
The detector part of early DTMF systems consisted of analog implemented bandpass filter banks, which were tuned to the eight standard frequencies. As analog lines as well as many other analog systems were converted to digital, researchers became ....etc

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three phase semi converter waveforms different firing angles ....etc

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Hello sir,
I am in final year B.tech (electrical & electronics engg.). I would appreciate your help in my minor project. I need a report on Cellphone operated Robot based on DTMF technology.
thanks ....etc

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http://electronic-circuits-diagramsremotecontrolsimages/5.gif
a circuit of a remote control unit which makes use of the radio frequency signals to control various electrical appliances. This remote control unit has 4 channels which can be easily extended to 12. This circuit differs from similar circuits in view of its simplicity and a totally different concept of generating the control signals. Usually remote control circuits make use of infrared light to transmit control signals. Their use is thus limited to a very confined area a ....etc

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I need detailed project report for the DTMF controlled four legged please help me. ....etc

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Purpose of our course project is to develop DTMF signal controlled house monitoring
system based on PIC Microcontroller. The device is connected to phone line and is controlled by
DTMF signal emitted by DTMF encoder in stationary or mobile phones. In presence of incoming
call the device pick-up the phone and answer the call connecting to the line. User can press
buttons and control the system remotely. Function of keys should be known initially (read
manual in appendix B). The functions are:
· speakerphone monitoring (you can lis ....etc

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CMOS Integrated DTMF Receiver

Features
• Full DTMF receiver
• Less than 35mW power consumption
• Industrial temperature range
• Uses quartz crystal or ceramic resonators
• Adjustable acquisition and release times
• 18-pin DIP, 18-pin DIP EIAJ, 18-pin SOIC, 20-pin
PLCC
• CM8870C
— Power down mode
— Inhibit mode
— Buffered OSC3 output (PLCC package only)
• CM8870C is fully compatible with CM8870 for 18-pin
dev ....etc

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Final Report on
Dual-Tone Multiple Frequency (DTMF) Detector Implementation
Presented By:
Giiner Arslan
for EE382C Embedded Software Systems
Abstract
Dual-tone Multi-frequency (DTMF) signals are used in touch-tone telephones as well as many other areas such as interactive control, telephone banking, and pager system. As analog telephone lines are converted to digital, researchers became interested in digital DTMF detectors.
There are many digital DTMF detecting algorithms, but most of them do not comply wit ....etc

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INTRODUCTION


In the present world of wireless technology every thing is going to be digital and wireless, and the cell phone is the key player in wireless technology today.
And today technology made the possessing of a mobile, considered as a basic commodity.
And the trends in wireless technology changing day-by-day and today the working is going on how to develop remote devices with out the presence of man and to reduce to the time factor and labor, and our project be ....etc

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This project is used to control 3 servo motors and 2 DC motors on a mobile platform. It needs to be controll in two modes. One is using a mobile phone on the robot which receives commands through DTMF tones from another mobile phone. The second one is from a computer. here using the same DTMF tone decoding circuit to control using the computer. try to use serial port for send a byte to a micro controller. Then generate DTMF tone using DTMF encoder . Then transmit the tone wirelessly. then decode these received DTMF signal , fix some command ....etc

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