LONG-DISTANCE TELEPHONE VIA INTERNET NETWORK

Nowadays communication is very necessary especially using telephone system which is very popular,but there is a disadvan- tage about the cost of long-distance call.This project is presented to reduce the cost in this case byconnecting the telephone to the computer and connect to the remote computer via internet network,which is lower cost thanlong-distance call and connect to the reciever\'s telephone.

Today digital images are very popular and widespread use in thedigital data communication such as internet on computer or even on mobile phone.So digital image communication should be able to be transmitted in a fast speed and be stored efficiently.As a result,there is renewed interest in improving algorithmsfor the compression of image data without losing much of the image quality.This project is presented wavelet transform which is a very popular method to compress data nowadays.

TARGET FINDING EQUIPMENT

This target finding equipment uses to find the direction of theobject or anything which is the user\'s target . The target finding equipment consists of two parts which are the transmitting part and the receiving part .The transmitting part will be placed on the target and the signalwill be transmitted to the receiving part . The receiving part will receive the signal by the antenna, then this signal will be demodulated and processed with the program to find the directionof the target ,and displayed on the computer .

This project is study of the “Speech Recognition” by analyze speech signal. First, we find bound of word, and select section that we consider. Then take the last result to analyze the parameters by LPC method. After that improve the parameters use to compare by Hidden Markov Model method, and pass decision rule. Finally, selecting word is shown.

ANTENNA AT REPEATER STATION FOR MOBILE TELEPHONE

Mobile Telecommunications become popular nowadays. In some situations, thecommunications cannot be achieved since the signal is weak. The repeater station is consequently applied. This project concerns about the design of the antenna for the repeater station for mobile telephone. This antenna is designed to transmit/receive radio wave. The antenna characteristics such as radiation pattern, input impedance and standing wave ratio are determined.

The purpose of this project is to study and create equipment which collect the parameters of an environment such as humidity, temperature, pressure and voice through wireless communication system. These data are measured by sensor and multiplex together then send to the receiver. In receiver use LCD monitor to show the parameter of an environment. The application will be used in agriculture system or Industrial Company.

Quadrature Phase Shift Keying

This project is proposed, transmitted and received using Quadranture Phase Shift Keying. The data will be transmitted via coaxial cable. In the transmitter the signals differ by phase shift and the receiver must be demodulate and decode the data. In this project used 64 kbps data stream modulated with 512 kHz carrier signal and used 256 kHz pilot signals. The advantage of QPSK is the signals have a single frequency, no DC component, easy to demodulate and clock recovery.

By
Sudphakdee Arun
Narongkakorn Seejantara

An Open Circular Waveguide Antenna

The goal this project is to experience An Open Circular Waveguide Antenna, that is the directional antenna. The radiation pattern of this antenna is one directional pattern. To improve the Directivity and Gain of antenna we also arrange antennae in array. The radiation pattern, gain and directivity of this antenna are tested and recorded to compare with the theory of antenna.

By
Samphob Phamaranonta
Thanapisith Kongsongka

1-Line Telephone Recorder with Billing System

This project concern about a recording system for single telephone line, it concludes the billing system to calculate the price, using time, called number and etc. This project uses the microcontroller MCS-51 which is applied for working with 1 channel telephone recording system including with the billing system. It stores the telephone data for national calling, international calling and mobile telephone. The interface for information uses the serial port RS-232. The data is displayed on monitor and data will be automatically printed out.

By

Jomjai Sriumpai

Areeya Sawasdichai

Wireless Security Camera

The security camara is quite difficult to install and change the position because of the new transmission line installation and needs the higher budget. This project propose a wireless security camera in order to eliminate the mentioned problem, it also proposes to change the camera angle ability by controlling with remote long distance via computer. The method is to send the video signal form the camera to computer and the computer software is able to control camera angle.

By

Karat Hlimsiriwongsa

Aeknarintara Kij-o-pas

Security System VIA Telephone Line

Security system is currently necessary, especially in the office building, super market or residence. Thus a closed circuit camera has become a popular equipment. As communication via telephone line has been improving to transmit a various information form including video signal, so in this project has applied a communication via telephone line to use with security system. It will can transmit a video signal from a camera via telephone line and then display on monitor by I/O instrument to connect communicating system.

By
Pradistha Katukaew

Piti Aucharern

Video and Audio Communication by TDM Technique

This project relates to study and design a transmission of video and audio signal by using time division multiplex (TDM) technique. The multiplexed signal are fed through a transmission line in a digital format. At the receiver, the received signal is demultiplexed to be the original analog audio and video signal which will be applied for specific work.

By

Yupparatana Bountharik

Wongsawarun Silanoi

Electric Equipment Control VIA Internet

This project presents an applied software to control the 8 channel electrical equipments. The program is divided into 3 parts, homepage program using HTML incorporating with ASP (Active Server Pages), electrical equipment controlled program at server and using Windows NT Server and IIS (Internet Information Server) with Visual Basic 6, microcontroller controlled program. The programs are developed for using in this project. The hardware part is electrical equipment controlled circuit using MCS-51 to develop.

By

Tharmmanoon Yachaiyasri

Wichien Mujcha

Saman chaiyuchit

Telephone Recorder

This project is a study about the telephone recorder with microcontroller in MCS-51 family doing as central processing unit for controlling the operation. It divides its operating into 3 parts as follows ; the first part is the data – receiving controlling from detector circuit, the second part is the data-sending controlling to computer units, and the part is the calculating of telephone service charges and can be driven out serial port through RS-232 to show its output on computer units, also can be printed from a printer. On every telephone call out, the recorder will record the starting time, the finishing time, the terminated line number or if the call-out phone is the other province line, it will show province in that area too. Moreover, it will show the rate of service charges when there is a dial eachtime, both in the area of the Metropolitant Telephone and the area of provinces.

By

Noppakun Wacharaporna

Somchai Tuenweeradech

Wireless Food Ordering Machine

This thesis is to study and implement the wireless food ordering machine. The function of work is to let the customer entering the code of food from the menu, where the result will be displayed on the LCD monitor then the machine will send this data to the receiver.

By

Kasian Sinthuwongsa

Kosawathana Sukchaya

Observaertion Car

This project presents an attached video camera to a small car, This car is controlled by computer to observe the desired area. The camera elevation angle is also controlled by computer. The video signal is sent to computer, it can be saved to be the files for next using. The RF signal is used for controlling and video signal sending.

By

Piyapongsa Lewmanokhun

Ajana Thongsang

Voice Pager

This project presents voice pager by use computer for trasmitted control center.Data is converted to digital signal and modulated in Binary FSK (Frequency Shift Keying).The receiver \'s microcontroller is serve the function of processing.There is a alarm when the data is received and display in form of voice.

By

Supharerksa Sripattanapiboon

Samart Prakotkanchana

Suksun Incherdchai

Wireless Local Area Network

Nowadays, Data Communications System has been developed rapidly. The usage of Local Area Network (LAN) is widely spreaded because of conveniently transference. Generally, LAN usually use wire connection however this method may be caused of wire area problem.The purpose of this project is to study and improve wireless LAN connection between 2 computers. Using programmed for control pattern communication through transmitter and receiver that use carrier like a medium of communication. And will develop to complete network later.

By

Nithis Sudkaew

Nissana Pattanapanichthamrong

Atthaporn Kaewngarm

Interface of Transceiver with Automatic Telephone System

This thesis presents the applications of the transceiver – telephone interface. That can connect transceiver to telephone system and telephone system to transceiver. So it intercepts and retransmits a signal to provide wide – area communication. The hardware is divided into 3 sections, there are interface control section, repeater section and decoder / encoder.

By

Konlayutha Juntawongsa

Tewun Jittajiaranai