Computer Hardware Review

Posts Tagged ‘input’

INTRODUCTION

the Visual display Unit (VDU) according to International Labour Office (1989) defined VDU as an electrical instrument that is use to display the information recieved from the computer system,in a very short period of time emerged from comparative obscruity in scientific laboratory(s) to become an integral and indespensable part of normal working life for millions of people both in home and in workplaces. As the technological revolutioncontinues, the use of computer with screen-base output unit or VDU grows at an incresing rate. worlwide, millions of VDUs are now in use, recieving and processing information on television-like screen or monitors. Also, it is a television type monitor that display information recieved from computer system wordprocessor rather than from a signal broad cast for televisio. The VDU contributes the interactive element between the operator and the computer system. The VDU could be limited to a main computer, as with a terminal or the physical entity comporising the VDU could also include the computer system, as with a personal computer (PC). the basic principle of operation of most VDUs in use is simikar to that of television sets.They contain a large evacuated glass tube, called Cathode Ray Tube (CRT), which include a source of electrons (The Cathode) and a phospor coating on thte inside of the vewing face of the screen. A high voltage (typically) in the range of 10-25kv accelerated electrons, releasing from the cathod towards a second electrode called The Cathode. They pass the through a hole in the anode on to the phosphor materials. However, computers are very important and for all the apparent complexity, they seems to hve a wide range of uses and play an ever-increasing role within our society likeoffice, commerce and industries, public services and of course schools and home, with this we can see that the importance of computer monitor can not be over emphasis.

STATEMENT OF THE PROBLEM

The study is to determine the influence of computer monitor (VDU) a computer system of an organisation and it is stated below:

1. what are the effect of VDU to human and health?

2. what are the control measure and prevention of VDU effect?

3. what are the measuement and level of control of radiation emmision of VDU?

PURPOSE OF THE STUDY

The purpose of this seminar is to provide information on the computer monitor which base on the influence, importance and the uses of computer monitor in a computer system of an organisation.

SCOPE OF THE STUDY

This project work will be based mainly on the use, importance and the configuration of a computer monitor

METHODOLOGY

During the course of this project work, data were obtained from second sorce, this cisist of information from the periodicals, texetrbooks, encarta software and research findings. Aslo, search engines like www.google.com, www.devilfinder.com, www.mamma.com, and son on will also contacted during the project work.

LIMIITATION OF THE STUDY

This research work suppose to go in-depth but due to the power fai.lure, there is no money to move from one place another, insufficient time allocation and the resarch is also expensive to carry out.

ANALYSIS TO THE STUDY

In the first generation of computerwhich was between the year 1945-1958 one of the first digital computer in this generation was a machine called ENIAC (Electrical Numerical Integrator and Calculator) was design band built at the Moore school of Electrical Engineering at the univesity of Pennsylvanian in 1956. This ENIAC contained over 18,000 vacuum tubes wieghed more than 30 tons and required 1500 square fact of floor space. It was programmed by setting up to 6,000 switch and connecting cables between the various units of the computer.

The second generation introduced the designing computer which was between (1958-1964) machine based on the store concet using discrete semiconductor element diodes, translator and so on. The vacuum tube was reduce to weighed about 25 tons and required 1000 sqaure of the floor space and again reduction in heat generation. The size-reduction brought by the utilization of semiconductor elements.

Between 1964-1971 which was the third generation f computer which was the third generation of computer which was characterized by further reduction in sixe of the VDu low cast, low in heat generatiion. Introduction of im[proved method of storing datas and applicaron of Integrated Circuits (I.C.), they accepted their input data through magnetic tape and magnetic disk, which they also accepted for secondary storage.

During 1971-1975, Here computer were first designed on the basis of large-scale integrated circuit along with vacuum 3tube and transistror. Each electronic along has its own set of characteristics including reliability, packing density, heated dissipation, speed and cost of all which designer must balance then the VDU size was drastically reduced compare to the first generation and the cost which is very cheap. This fourth of computer are otherwise known as microprocessor on a chip and is characterized by the energence of personal computer (PCs) so called foruth generation programming language such as spread sheet, Dbase III, windowing menu dialoging and other paraphernalia.

The fifth generation of computer (1975-1995) is the mother language or lingual franca of each user. Hence the following thechonolgies were involved in the fifth generation; (1) Micro electronics (2) computer architecture (3) Artificial intelligence (4) Language processing (5) database management. A logical influence is an elementary inductive method of reasoning and each lips is equivalent to some 300 instruction on a conventional computer.

The sixth generation of computer monitor was the geneation which innovation called Optic Computer, the computer of this generation is from year 1995 till date and the computer of this generation are laptop computer, palmtop computer, plasma computer all which are usin a flat screen are been constructed. Here are the computer monitor that came into being in this generation MDA (Monocrono Display Adapter), HA (Hercules Adapter). CGA (Color Graphic Adapter), LCD (Liquid Crystal Display), Palmtop Plasma Television and so on.

THE DESIGN OF A MONITOR

The Monitor could be linke to a main computer, as with a terminal, or the physical entity comprising the VDU could also include the computer system, as with a personal computer (PC). The basic principle of operation of most VDUs in use is similar to that of television sets. They contain a large evacuated glass tube called Cathod Ray Tube (CRT), which include a source of electrons (the cathode) and a phosphor coating on the inside of the viewing face of the screen. A high voltage (typically in the range of 10-25kv) accelerates electrons release trom the cathod towards a second elctrode on to the direction and thus the impact of the points of the electrons on the phosphor are controlledby magnetic field produced by deflecting the coils mounted near the back of the tube. In this manner, the electron beam is swept horizontally and vertically across the viewing face-the whole face normally being-covered in about 1/70th of a second. By modulating the intensity of the electron beam in each position, the resulting pattern of light and dark points can be generated into pictrue. The electronic circuit used to control these processess gives rise to both radio frequency (RF) field and to electric and magnetic fields of lower frequencies. Recently, solid state circuitry in conjuction with liquid crystal, gas plasma or similar display technology(s) has been used to replace cathode ray tube. However, to a rather limited extent.

DEFINITION OF TERMS

Computer:- an electronic device capable of storing and processing information in accordance with a set of instruction.

Cathode Ray Tube:- a vacuum tube in which beam of electrones produce a luminous image on a fluorescence screen, used in television and display unit (VDU).

Monitor:- a television used to view a pictrue from a particular camera o a display from a computer.

Monochrome:- consisting of or display image in black and white or in varying tones of one color.

Hercules:- requiring or having greate strnght or effects.

Flash:- shine with a bright but brief or irregular light.

Pixel (Pictrue Element):- any of the tiny ray of light on a display screen which are made up of an image.

Pallete:- a thin board on which an artist lay anf mixes pints abd the range of color used by an artists.

CONCLUSION

In conclusion, there are no health hazards associated wityh radiation, graphic adapter and field from VDUs. However, since a large number of people are involved in VDU work measure sohould be taken to ensure that VDU workplace are economically well designed. This include aspect of the VDU, the workstation and the work environment as well as work organiszation.

REFERENCES

Bergqiust, U. (1984), “Video Display Terminals and Health”, in scandinavia via journal of work environment and

health (helsinkin), vol.10.

Health and Welfare (Canada).1993), Investigations of Radiation Emission from Vidoe Display Terminals, Reporter 83-

-91 (Ottawa, Environment Health Directorate).

Intenational Labour Office (ILO), 1989. Working With Visual Display Unit, Occupational safety and Health Series

No. 61.

Locksley E.A. et al (2006). Introduction to Computer Studies 1, Immacuilate Concept, Ogbomosho, Oyo state

Pg. 3-7.

Micheal Tooley (1997), PC Troubleshooting Pocket Book, the bath press Pg. 150.

The most well known speaker in the world is out to give you yet another stunning performance. Computer speakers are such in demand in the market now. People using the internet, teenagers hooked with their on line games are the primary users of this electronic device. Their ground-breaking inventions and improvements will surely fascinate you.
A computer speaker is a built-in device that generates the sound from the computer. This kind of speaker is designed for PCs or personal computers. A lot of different computer speakers can connect via a jack, USB, RCA connectors, socket and plug. They are commonly designed as attractive, small and versatile.
There are also durable brands that are a bit expensive but are worth the price. Computer speakers can also be used when you are listening to music, playing 3D games or watching a number of movies.
Moreover, computer speakers are in demand in the market now. People using the internet, teenagers hooked with their on line games are the primary users of this electronic device. Even the movie addict who only knows how to download their favourite and the latest movie on the net is obsessed with the idea of a good sound woofer in order to imitate their home theatres.
External speakers or the multimedia speakers are commonly equipped with a low-power internal amplifier. The standard audio connection is a stereo jack pug about 3.5 mm and coloured green for computer sound cards. Some uses an RCA connector for input but there are also types who use USB speakers which are provided with 5 Volts at 200 milliamps which can allow about a half watt of output power. They usually have an equalization feature for treble controls and bass. Computer speakers usually range from low quality, high-quality and expensive speakers.
Computer speakers vary greatly in price and quality and the typical speakers that are included in the computer package is mediocre in performance and sound quality.
Listed below are some of the types of computer speakers
• Logitech Z_2300: This computer speaker is loud and nice. The sound comes out without distortion or losing clarity. This is even at a high volume level. The Z_2300 computer speaker has a two forty watt satellite and a one hundred twenty watt subwoofer. The Logitech computer speaker is an adapter speaker that can be used in DVD players as well as in gaming.
• Lansing VS2421: This brand of computer speaker is a high-quality basic speaker. The VS2421 has a thirty five Hz to twenty Hz for a full volume sound. It also uses twenty eight watts of electricity. This computer speaker device has a hardwire remote control used for controlling the treble and volume. Its hardware remote control includes a mute button, auxiliary input both for CD players and MP3s, as well as a microphone.
• Logitech Z_5500: This brand of computer speaker device consists of six speakers as well as a subwoofer. This five hundred five watt Logitech speaker is the best speaker for movie buffs and computer gamers. The Z_5500 speaker has a very high volume level and bass control. It can also be used in CD players as well as portable DVD players.
• Tritton USB Portable Computer Speaker: This computer speaker is especially made for portable computers. Tritton USB speakers have a fixed subwoofer that is suitable both for low and high volume control. This type of speaker does not need power adapters or even batteries. This USB portable computer speaker is powered by fifty centimeters of USB cable. This speaker uses about one hundred ten to two hundred watts.
• Edifier S2.1 computer speaker: This computer speaker features three different inputs such as analog and two digital inputs. The two digital inputs inside this speaker consist of one optical and one coax. The S2.1 speakers have a wired remote, LFE, treble and loudness volume. This computer speaker comes with four meters of optical cable and three meters of cable stereo analogue. It also has a decent high output for a sixty-five inch subwoofer. Edifier speakers have removable grills. The S2.1 has a maximum of one thousand power consumption.
• Groove PM21Computer Speakers: This speaker brings high-qualities of sound. It also mixes great sound to PCs and laptops. PM21 has a simple set up composed of three speakers as well as a modern design for flat monitors. It also includes a compact style that is suitable for travelers. This speaker is around two hundred twenty watts. Groove computer speakers bring a clear and nice sound to every computer.
• Cyber Acoustic 3001 Personal Computer Speakers: This kind of speaker for computers is the best and most affordable three-piece subwoofer for computers. It has a suitable desktop volume level and cloth grill coating. The speakers have three poly carbons, two high rate satellite radiators plus a high quality woofer.
• Labtec Pulse 430 Personal Computer speakers: The Pulse speaker has a tall three-piece audio that is cheap and very convenient for everyday usage. It also has a great subwoofer for throbbing bass as well as packed in satellite speakers. This three-piece powerful speaker provides realistic, dynamic, powerful and crystal clear sounds. Labtec Pulse features a USB, jack, socket and plug connector.
• Hidden Spy Computer Speakers: This speaker delivers high quality, powerful clear sounds. Computer speakers of this brand have an attractive style as well as coat cover speakers. It has a USB cable and jack connection. Hidden Spy speakers are around one hundred ten watts to two hundred twenty watts.
Thus, when it comes to recently featured computer speakers, Altec- Lansing is well known and respected. This is due to the long years it has put in developing the best sound woofers for your computers.
In fact, Altec-Lansing released their new high-end computer speakers. It has a simple, elegant style and complete with fantastic sounds, making it perfect for people who only seek quality computer speakers for their computers and audio devices.
Their FX series possess a remarkable sound from the FX satellites’ REAL two-way system. This means that each satellite has two drivers that are both active. The beauty of this new innovation is that the FX 4021 and FX 5051 can be mounted on the wall. Thus, the first 5.1 system of FX5051 can offer the advantage of having a USB plug -and -play connectivity, which adds to its ease of use.
Comparing the FX 4021 and the FX 5051 specifications, with regards to its unique features are as follows:
FX 4021 uses an isobaric subwoofer with dual 5.25 inches woofers. Aside from this, the rest of the specifications are already similar to the FX 5051. Hence, the FX5051 is similar on some specifications with the FX 4021 but it has a better isobaric subwoofer with dual 6.5 inches woofers, a USB 5.1 connectivity, digital hardwired controller for stand-by, master volume, bass, treble and centre controls.
It also needs a minimum system requirement of a personal computer with a 500 MHz processor, Operating system of Windows 98SE, 2000, ME or XP, a minimum Random Access Memory of 64 megabytes, music and game title that is encoded for 5.1. This is along with an available Universal Serial Bus or USB port.
Both models have a two- way satellite that can be mounted to the wall. Plus, each satellite possesses the following:
• a 40 mm midrange driver
• 18 mm tweeter
• wireless remote for controls
• built in cable management
• conveniently located auxiliary input for mp3
• portable Compact Disc players
• Head Phone jack
Another innovative invention is the FX6021 which has a so called InConcert technology. This can be for music, home theatre or gaming addicts.
Moreover, this technology can deliver a crisp, clean, full- volume sound that feels like its covering every bit of you. This can even express s sound that is in a straight forward manner, not up and down. This means that the sound is clearer and uncluttered by the reflections of the ceiling, wall or floor.
Aside from this, it also has two super slim satellites that feature 12 neodymium one-inch micro drivers. Each micro driver is supported by its very own distinct amplifier. A 6.5 inches subwoofer accomplishes the sound through its low- frequency and a full- throated bass.
Comparing this high end speaker, FX6021, with a high performance speaker like the VS 4221 that possesses an impressive bass capable of registering on your Richter scale, they are still not on equal footing. This is due to the fact that the VS4221 has a 3 inch driver for a warm, uniform sound, capable of surrounding an entire room. The stunning result would be robust, rich sounds that only very few woofers can match.
Thus, a wide selection of speakers is now available and they differ depending on the user’s demands and needs. With this, it is imperative that you are constantly updated on the types of computer speakers available in the market. This way, you will be able to keep in touch with how the evolving technology can work to your advantage.