DESIGN AND IMPLIMENTATION OF A WIRELESS AUDIO TRANSMITTER
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This is to certify that the research work, "design and implimentation of a wireless audio transmitter" by ---, Reg. No. --/H2007/01430 submitted in partial fulfillment of the requirement award of a Higher National Diploma on --- has been approved.
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DEDICATION
This project is dedicated to Almighty God for his protection, kindness, strength over my life throughout the period and also to my --- for his financial support and moral care towards me.Also to my mentor --- for her academic advice she often gives to me. May Almighty God shield them from the peril of this world and bless their entire endeavour Amen.
ACKNOWLEDGEMENT
The successful completion of this project work could not have been a reality without the encouragement of my --- and other people. My immensely appreciation goes to my humble and able supervisor mr. --- for his kindness in supervising this project.
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This work is on wireless audio transmitter is a device for transmitting domestic audio signals wirelessly from one location to another. It is most commonly used for sending the audio output of a source device, such as a satellite television decoder, to a television in another part of a property and provides an alternative to cable installations. The aim of this work is to design wireless transmitting device that allows you to wirelessly extend the audio signals from your VCR, satellite receiver, or camcorder using composite and audio cables.
TABLE OF CONTENTS
TITLE PAGE
APPROVAL PAGE
DEDICATION
ACKNOWELDGEMENT
ABSTRCT
TABLE OF CONTENT
CHAPTER ONE
- INTRODUCTION
- BACKGROUND OF THE PROJECT
- AIM/OBJECTIVE OF THE PROJECT
- SIGNIFICANCE OF THE PROJECT
- APPLICATION OF THE PROJECT
- LIMITATION OF THE PROJECT
- SCOPE OF THE PROJECT
- PROJECT ORGANISATION
CHAPTER TWO
LITERATURE REVIEW
2.0 LITERATURE REVIEW
2.1 REVIEW OF THE STUDY
2.2 REVIEW OF WIRELESS AUDIO
2.3 DESCRIPTION OF WIRELESS SIGNAL
2.4 REVIEW OF DIFFERENT TYPES OF WIRELESS SIGNALS
CHAPTER THREE
3.0 CONSTRUCTION METHODOLOGY
3.1 BLOCK DIAGRAM OF THE SYSTEM
3.2 CIRCUIT DIAGRAM
3.5 DESCRIPTION OF MAJOR COMPONENTS USED
CHAPTER FOUR
RESULT ANALYSIS
4.1 CONSTRUCTION PROCEDURE AND TESTING
4.2 CASING AND PACKAGING
4.3 ASSEMBLING OF SECTIONS
4.4 TESTING OF SYSTEM OPERATION
CHAPTER FIVE
- CONCLUSIONS
5.2 RECOMMENDATION
5.3 REFERENCES
CHAPTER ONE
1.0 BACKGROUND OF THE PROJECT
The era of wire or cable connection for reception of audio media is almost obsolete. Now technology is making everything wireless and stress free. This device is another brilliant technology that can let you connect your video footage from one point to another without wires, example connect different TVs in different locations(rooms) from your DVR(DSTV Decoder) without running wires, CCTV cameras to audio amplifier without running wires, DVD to TVs or speakers in different rooms without running cables.
Wireless audio Transmitter arrives with an inbuilt antenna as well as having a really Low Power Consumption is a new way to share signals from many devices. Share audio signals from VCR, DVD, Satellite receivers, set-top box or CCTV camera to any TV or monitor in different rooms wirelessly with this transmitter system.
This visual system has a huge transmission range and can even reach more than 500 meters (1500ft) in open spaces making it great when setting up around the home or the office. Simply connect using the AV cables provided then turn the transmitter on for instant signal transmission, so you can start listening the footage straight away. This wireless audio transmitter has adopted advanced microwave wireless transmission technology so that it can transmit high quality audio signals, therefore eliminating the need for cables.
Connect the transmitter to your amplifier or your computer downstairs and the set the receiver in another room and you can enjoy it there, rather than having to carry the DVD player or other equipment into the other room. Ideal for listening TV audio or radio in another room from the satellite box or for keeping an eye on your property while you lay in bed, this video system allows an alternative to be possible without the need for wire.
1.1 OBJECTIVE OF THE PROJECT
The objective of this work is to design and implement a device for transmitting domestic audio signals wirelessly from one location to another over a frequency mode. The frequency at which it is transmitted has much more available bandwidth than that which is available at the analogue level.
1.2 PURPOSE OF THE PROJECT
A wireless audio sender allows you to transmit audio signals of cable, satellite, , radio, DVD player, VCR, projector, or computer, etc. from one room to another wirelessly. RF-Link 5.8GHz audio sender not only provides 300 ft (100 meters) wireless transmission (in open space).
1.3 SIGNIFICANCE OF THE PROJECT
Wireless signals are electromagnetic waves travelling through the air. These are formed when electric energy travels through a piece of metal - for example a wire or antenna and waves are formed around that piece of metal. These waves can travel some distance depending on the strength of that energy.
This device is important because it can transfer information - audio -- without the use of wires, and that makes them very useful.
1.4 SCOPE OF THE PROJECT
Spread-spectrum techniques are methods by which a signal is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth. Within the video sender market, these techniques allow for a wireless signal to be transmitted with much less chance of interference from, and to, frequency mode.
It is not uncommon for several Wi-Fi networks to be within range of a typical home and as such, spread-spectrum based audio senders are often the best solution for transmitting video signals within this crowded wireless environment.
Some manufacturers use proprietary spread-spectrum techniques, enabling typical operational ranges of up to 80 metres in-building. By also employing externally mounted antennas, operational ranges in excess 2000 metres.
1.5 APPLICATION OF THE PROJECT
This device is used to connect home entertainment and AV devices in a home or a business. These transmitters are also used to connect security cameras to displays and recorders. For instance, a home security system can be set up that utilizes a video transmitter for cameras that monitor the front door, or a home theatre can be set up with wireless transmitters to allow audio signals to be beamed to different TVs in the home.
Wireless video transmitters are used to send a audio signal from any AV or HD audio source to a receiver in another location.. No matter which type of wireless audio transmitter one chooses, there are certain issues the buyer should be aware of when it comes to wireless audio transmitters used for security.
1.6 LIMITATION OF THE PROJECT
Radio Interference
Radio frequency interference, or RF interference, is one of the major problems that can plague wireless setups. This is because there are so many wireless devices in operation today. Many of these wireless devices, like cordless phones, function using the same radio frequencies as video transmitters. To determine if this is the problem, one should turn on the wireless receiver without turning on the wireless video transmitter. If any symmetrical picture is displayed it is likely that there is interference.
Obstructions
An obstruction refers to anything that is between the transmitter and is obstructing the signal from reaching the receiver successfully. Although wireless videos can transmit through walls, there is always some degradation of the signal. If obstructions like walls or thick trees are unavoidable, the solution is to get the transmitting and receiving antennas up as high as possible, as many of the obstructions that the signal encounters include furniture and other items sitting on the floors.
1.7 PROJECT WORK ORGANISATION
The various stages involved in the development of this project have been properly put into five chapters to enhance comprehensive and concise reading. In this project thesis, the project is organized sequentially as follows:
Chapter one of this work is on the introduction to a wireless audio transmitter and receiver over frequency mode. In this chapter, the background, significance, objective limitation and problem of a wireless audio transmitter over frequency mode were discussed.
Chapter two is on literature review of a wireless audio transmitter over frequency mode. In this chapter, all the literature pertaining to this work was reviewed.
Chapter three is on design methodology. In this chapter all the method involved during the design and construction were discussed.
Chapter four is on testing analysis. All testing that result accurate functionality was analyzed.
Chapter five is on conclusion, recommendation and references.
CHAPTER FIVE
5.1 CONCLUSION
The wireless video signal transmitter and receiver system apparatus capable of accepting both external baseband video signal inputs and an external modulated video signal modulated at a particular television channel, such as television channel. The wireless video signal transmitter and receiver system apparatus serves to transmit an video signal to one or more remote receivers which regenerate the original video signal providing both baseband audio and video signal outputs as well as a modulated video signal output at the predetermined particular television channel.
The wireless video signal transmitter and receiver system apparatus includes down converter means which converts the received RF signal directly to an IF signal which corresponds to the carrier frequency for television channel 3, namely, 61.25 MHz. In this manner, the IF signal provided by the down converter means can be directly provided to the receiver means as a television channel 3 interface having a full double-side band signal which results in minimal degradation of picture quality.
The receiver means of the wireless video signal transmitter and receiver system apparatus preferably further includes modulated video signal bypass means. Modulated video signal bypass means are operably and electrically connected to the modulated video signal output means of the receiver and serves to connect the transmitted RF signal to the output of the modulated video signal output means when the transmitter and receiver system apparatus is in use. The modulated video signal bypass means further serves to alternatively connect a modulated video signal source applied to the receiver means to the output of the modulated video signal output means when the receiver is not in use. The television monitor connected to the receiver means will receive the output of the receiver means directly when the system apparatus is in use and, alternatively, will thus receive an auxiliary input to the receiver means when the receiver is not in use, such auxiliary input typically being an additional signal source such as a local antenna, VCR, or cable system connection.
The modulated video signal input means comprises modulated video signal input connector means for accepting connection of the external modulated video input signal. First modulated video signal detector means are provided for converting the external modulated video signal input to a composite internal baseband video signal and an audio sub-carrier signal. Further included are audio sub-carrier filter and amplifier means electrically connected to the modulated video signal detector means for removing unwanted video information from the audio sub-carrier signal towards providing a first internal audio sub-carrier signal. The modulated video signal input means further includes video buffer means electrically connected to the modulated video signal detector means for providing the first internal baseband video signal.
The baseband audio signal input means of the present apparatus preferably comprises baseband audio signal input connector for accepting connection of the external baseband audio signal, pre-emphasis network means which are electrically connected to the baseband audio signal connector. The pre-emphasis network means serves to boost the high frequency components of the internal baseband audio signal toward removing noise components when the signal is demodulated. Baseband audio sub-carrier modulator is included and is electrically connected to the pre-emphasis network means and serves to modulate the external baseband audio signal thereby generating an audio sub-carrier signal output. Audio sub-carrier buffer means are electrically connected to the baseband audio sub-carrier modulator towards providing as an output there from a second internal audio sub-carrier signal.
The baseband video signal input means of the present apparatus comprises a baseband video signal input connector for accepting connection of the external baseband audio signal.
In this work, the video/RF switch comprises a double-pole double-throw switch the first half of which permits the selection between the first internal audio sub-carrier signal and the second internal audio subcarrier signal. The second half of the double-pole double-throw switch serves to permit the selection between the first internal baseband video signal and the second internal baseband video signal.
The baseband video filter of the present apparatus preferably comprises a baseband video filter amplifier electrically connected to the second half of the video/RF switch, baseband video filter buffer electrically connected to the baseband video filter amplifier and baseband video filter lowpass filter electrically connected to the baseband video filter buffer. The baseband video filter amplifier, video filter buffer and video filter lowpass filter serve to remove unwanted audio sub-carrier frequency component from the baseband video signal.
The up converter means of the present invention utilizes a fixed local oscillator to convert the modulated video signal to an RF signal. The RF amplifier means to which the signal passes in this device comprises a bandpass filter, matching pad, amplifier, combination highpass/notch filter, two amplifiers and lowpass filter all of which are connected in series. The transmitter antenna comprises a coax balun and dipole antenna which serves to transmit the RF signal to the receiver.
5.2 RECOMMENDATION
The basic construction of an RF modulator, is not very complicated. The signal that needs to be modulated is taken in as input. It is first passed through a comparator and then through a low noise amplifier (LNA). The low noise amplifier amplifies the input signal. This is done because the signal loses some strength during the transmission and this step is taken as a preventive measure. The output of the low noise amplifier and the radio frequency wave is mixed in a mixer, to produce the modulated signal. This is the basic methodology of a modulator's working. But the process of radio frequency modulation has a huge number of variations. There are lots of other modulation techniques that can be used, like the Phase Shift Key (PSK), to modulate the signals with the radio frequency. In general, radio frequency modulation is done digitally nowadays.
The RF modulator is an important component in all RF transmitters as well as VCD, DVD players and PlayStation. In fact, earlier, PlayStations used to come with an external RF modulator since all television sets then had coaxial inputs. RF cables are used to transmit signals from these devices to our televisions. The audio and video signals are RF modulated, before sending them to the television antennas or cables, which works at that frequency. The modulation and demodulation of the signal, at both the ends, is often the reason behind the good picture and sound quality. However, modern RF modulators that comes integrated in our VCD players, DVD players or PlayStation, cause minimal or no damage to the picture and sound quality.
Many televisions, mainly the ones manufactured before the advent of DVD players, use coaxial cables and do not have proper A/V inputs. In such cases, you need to buy an external RF modulator to serve your purpose. They need an external power supply and if you are using one, then please be sure that you have a power source near your television set. Many people confuse RF modulators with video switchers. Video switchers are devices that help you in connecting more than one device to a single terminal, whereas an RF modulator helps you in attaching those devices to your television.
Radio frequency modulators are also used in the fields of defense and aviation. In fact, all radars send signals within the range of radio frequencies. In the aviation industry, the information that is sent to flights also needs to be radio frequency modulated. The construction of the RF modulator, is thus done with reference to the purpose, it is going to serve.
CHAPTER TWO: The chapter one of this work has been displayed above. The complete chapter two of "design and implimentation of a wireless audio transmitter" is also available. Order full work to download. Chapter two of "design and implimentation of a wireless audio transmitter" consists of the literature review. In this chapter all the related work on "design and implimentation of a wireless audio transmitter" was reviewed.
CHAPTER THREE: The complete chapter three of "design and implimentation of a wireless audio transmitter" is available. Order full work to download. Chapter three of "design and implimentation of a wireless audio transmitter" consists of the methodology. In this chapter all the method used in carrying out this work was discussed.
CHAPTER FOUR: The complete chapter four of "design and implimentation of a wireless audio transmitter" is available. Order full work to download. Chapter four of "design and implimentation of a wireless audio transmitter" consists of all the test conducted during the work and the result gotten after the whole work
CHAPTER FIVE: The complete chapter five of "design and implimentation of a wireless audio transmitter" is available. Order full work to download. Chapter five of "design and implimentation of a wireless audio transmitter" consist of conclusion, recommendation and references.
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