Television (TV) is a wireless telecommunications display technology that uses a two-dimensional picture tube to reproduce images, moving or still, and sound. The term “TV” may refer either to the television set, a television program recorded on a storage medium for playback at a later time, or the medium itself (analog or digital video broadcast). Television became popular in the late 20th century as broadcast TV replaced the old analog television system.
Sounds, pictures and moving images ― all can be transmitted to a television set through waves that carry the visual and audio information from stations. These waves are produced by a transmitter, which is more commonly called a tower. A television antenna receives these waves and relays them to the receiver, or picture tube, inside the television. Sound is created by moving electrons moving across a copper wire in the electronic circuit. Graphics may include words, pictures or video.
Technology behind the TV
Television (TV) technology allows for the simultaneous broadcasting of images and sounds from one source to many different people at the same time. With the use of encryption, a television signal can be distributed to any device with the capability to decode it. Within the home, TV signals are transferred by coaxial cable through a common antenna (which is built into TV sets in the United States).
So, how has television changed over the past 100 years? In a word (or rather 10): Pixels, pixels, pixels! Whether you’re watching TV on a wall, ceiling or inside a desk, light is projected onto millions of tiny features called pixels. The amount of pixels in today’s TVs can be measured in terms of 1080p – that’s 1080 horizontal lines containing 720p vertical “scanning lines” of resolution.
A TV camera is used to transmit pictures, instead of sound. There are three main types of TV camera lenses: wideangle, zoom and telephoto. Wideangle lenses have a small angle of view, so you have to be close to your subject. They are usually used for sports reporting where it is important to show the context of the game. Zoom lenses have a large angle of view and can be adjusted quickly on the fly.
A television (TV) picture is made up of thousands of tiny dots called pixels. An electronic eye in the TV camera sends light from the picture into an electronic video camera tube, which converts the picture into pixels or tiny colored dots that make up the television picture. These pixels are transmitted by cable or broadcast The process of sending TV pictures all starts with beams of electrons. In a large building on a hill outside of Moscow are millions of TV cameras.
HowTV works TV cameras capture pictures of people, events, and objects and send the images as radio waves to a transmitter. Signals from TV stations are sent via microwave or fibre optic cables to satellite dishes on the roofs of homes across Australia. The signals are then passed onto a converter box, which converts them into pictures and sound on your TV screen.
How does a television (TV) work? Radio waves, the kind that transmit TV programs, are broadcast from towers. These radio waves are carried through the air as the signals leave the transmitters and are reflected off of other towers and other objects until they reach your TV.
The picture you see on your TV screen is produced by an electron beam scanning back and forth across the inside of a vacuum tube up to 20 times per second. These scanning beams of electrons allow you to see the pictures transmitted through the air, without any wires attached. When you press your remote control control button, two important things happen: First, a device called a converter changes your infrared signal into radio waves that can travel through the air without any wires attached.
Television (TV) works because of a combination of transmitters, receivers, and antennas. There are two types of TV stations: over-the-air (also called “terrestrial”) stations and cable TV stations. Local TV stations broadcast to your home over the air using transmitters. A wavelength is the unit for measuring distance between two points in space on a wave. How far away a radio wave travels depends on its wavelength.
Television works like computers. A computer has a central processing unit (CPU) that receives instructions on how to perform tasks. Computers transmit commands and data by using cables. In a similar way, television uses cables to receive the signals broadcast by a central station. These stations—which are like giant computers—transmit high-frequency radio waves.
A television receiver is an electronic device that receives and demodulates, or extracts the signal encoded in radio/television broadcasts. This signal is made up of a carrier wave by varying at radio/television frequencies (RF) with sound and picture information modulated onto it. The receiver extracts the information by blowing the signal into its input circuits and using some sort of frequency detection device to make sense out of the frequency variations.
The idea behind TV sets is to convert the moving pictures and sounds of television programmes, into a pattern of electrical signals which will control tiny Liquid Crystal Display (LCD) picture elements. The technology used in most ‘modern’ televisions is not particularly new. It has developed over the years since it was first developed in the late nineteenth century.
A television (TV) receiver picks up radio signals transmitted over the air from nearby television stations and translates them into pictures on a screen. The picture is produced by scanning the beam rapidly across and then down a fluorescent screen that has been coated with phosphors. When the phosphors are struck by the scanning electron beam, they glow, creating an image. In color sets, three electron beams produce red, green, and blue images on different sections of the screen.
A TV receiver is a communications device that interprets audio and video information, and displays the transmitted information on a screen. Its name is derived from the fact that it both accepts and emits information. Early television receivers used electron tubes to amplify the signal. Today they are more likely to house transistors or additional electronics. There are two types: analog and digital.
A television (TV) receiver is a set that receives radio waves over the broadcast airwaves and displays them as sound and picture. To work, the antenna must be connected to the receiver, which then converts radio waves into visible images and sounds. The picture changes depending on how it is being received. For example, with a regular antenna, you get an image from one TV station at a time.
Cathode-ray tube (CRT) televisions
The cathode-ray tube (CRT) TV depends on three parts—the picture, the deflection system, and the projection system—for its operation. The CRT TV uses a glass tube with three electron guns inside it. When you turn on the television, each gun is controlled by an oscillating magnet that operates at a very high frequency (60 Hz in the United States).
How does TV work? Find out the inside scoop on how your TV’s circuitry, or electron gun and tube, make images appear. A Cathode-ray tube is like a vacuum tube that is used for a TV picture tube. Two types of CRTs are used: shadow masks and aperture grills. The difference between the two is that the shadow mask has an opaque mask in front of the electron guns (usually made of phosphor), whereas an aperture grill does not have any masks .
First, the incoming video signal from your antenna is sent to a special circuit called a blue gun. This circuit amplifies the video signal and reduces the chrominance (color) information to one-third of its original level. The blue gun converts the information into blue light at about 36 percent intensity, hence the name `blue’ gun. The blue light is then passed through an electronic device called a shadow mask, which acts like a stencil to allow only certain segments of blue light through.
The cathode-ray tube (CRT) evolved from the original TV screen and is still used in some TV sets today. All TV monitors work on the same basic principle: Electrons are accelerated toward the front of the tube, setting up a pattern of electromagnetic fields that deflects and focuses the electron beam onto the screen.
The cathode-ray tube works by selectively firing charged particles at a phosphorous screen. All television and computer screens are variations on this same type of tube. In order to work, the tube must be struck by an electron beam at the proper angle to create a light spot or image on the screen. This striking process is called shooting or scanning.
Today’s flat-screen (“plasma” and “liquid crystal display” or LCD) television sets are the direct descendants of the televisions that first appeared in our living rooms during the 1950s. Back then, all TVs had vacuum tubes, which meant that they were “big”, heavy, vibrated a lot, and was prone to overheating, which is why tin-foil screens were placed behind them.
Flat-screen televisions are becoming increasingly popular due to their thin form and large display size. Most flat-screen televisions use LCD (Liquid Crystal Display) and LED (Light Emitting Diode) technology in HDTV models and high-definition television (HDTV). They provide crisp images with a resolution range of 720p to 1080i or 720p to 1080p, depending on the screen size.
As per Trustedreview.in, a flat screen TV, also referred to as a FSTV or just flatscreen, is the newest kind of television. It is also called an Organic Light Emitting Diode (OLED) TV, or an array LED TV. An array LED TV is similar to a FSTV except it can also produce a 3D picture. This type of TV uses either incandescent lighting for backlighting or using LED lights for backlighting.
A brief history of television
A short history of television The word “television,” coined in 1926, is a portmanteau of the Greek words for “far” and “to see.” Despite being such a new invention, its history goes back much further than you might think.
By Chris Woodford. Ever since man first looked up at the stars and wondered what they were, he has pushed forward the frontiers of knowledge. Today, scientists are pushing technological advances even further—including our understanding of how television works.
Television (TV) is a system of broadcasting moving pictures and sound by radio to audiences or subscribers. Used for entertainment, education, news and advertising, television is broadcast from studios at regular times. First brought to the public in the years following World War I, it has become the primary source of news and entertainment for most people in developed countries around the world.