The Tv

The tv
Television is a system for transmitting and receiving moving pictures and sound at a distance. This transmission can be effected by radio or by specialized networks of cable television. The receiver of the signals is the TV.
The word "television" is a hybrid of the Greek word "tele" (distance) and the Latin "visio" (vision). The term refers to television all aspects of televisionprogramming and transmission. Sometimes abbreviated as TV. This term wasfirst used in 1900 by Constantin Perski the International Electrical Congress of Paris (CIEP).
The World Television Day is celebrated on November 21 in commemoration ofthe date it was held in 1996 the first World Television Forum at the United Nations.

OPERATION

First, a camera receives light from the stage, introducedinto his system and a series of lenses they lead to several photodiodes located on a CCD chip. Thatbecomes the light of the scene in a video signal. At the same time, a microphone picks up sound and converts it into an electrical signal also audio.The two combined signals are sent to a satellite and at the same time it sends to a receiver that picks up the signal through an antenna, a satelliteor cable. The TV receives signals. There, the leading audio signal to an amplifier and a speaker.

TV History OLD TELEVISION

The advent of television moved quickly radio room to the bedroom, bathroom or kitchen. The team is pictured on the left, presenting for Decca in the 19 thNational Exhibition of Radio and Television in London in 1952, combining radiowith television in a single cabinet, the screensize to allow large groups to attendProgrammes Girls success, as the popular Show Lucille Ball, which is an imageon the right.

Colour Television

Colour television was launched in the United States and other countries in the1950s. In Mexico, the first color broadcasts in 1967 and made ​​the following decade in Spain. Over 90% of households in developed countries now havecolor TV.

Some typesof TVs
Black and white TV, the screen shows only black and white images.
Colour TV: the screen is apt to display color images. (It can be CRT, LCD, Plasma or LED)
LCD TV, flat-screen liquid crystal display (or LCD)
Plasma TV: flat, usually uses this technology to larger formats.
LED TV: Flat, with a screen made ​​up of LEDs.
Holographic Television: projector that projects a series of movingimages on a transparent screen.

The history of television
The history of television is inseparable from the history of television, at least in its origins and that is why in this chronology, including significant events in the history of television, along with the history of television. 

1873 - The English engineer Willoughby Smith discovers the photoconductivity of selenium, which allowedfurther develop the first photocell. 

1884 - Paul Gottlieb Nipkow disk Nipkowun invents a device that can scan a scene. Consisted of a disk with several holes and spiral after the holes are placed a sensor that recorded the intensity of light and recorded in the form of lines. 

1897 - The Cathode Ray Tube or CRT is invented by a German physicist named Karl Ferdinand Braun. Initially thisdevice was called Braun tube (Braun tube). 

1923 - Vladimir Kosma Zworykin a Russian-born American physicist invented iconoscope, considered one of the first TV cameras. 

1926 - A Scottish scientist named John Logie Baird made in London on January 26, 1926 the first demonstration of motion pictures on a screen. This is the beginning of the TV. 

1926 - JLBaird publicly begins broadcasting TVsignal through two pirate radio stations. 

1927 - Philo Taylor Farnsworth, a prolific engineer and inventor patented Image Dissector Tube. 

1928 - The first transmission in the city of Washington (USA). The signal had a resolution of 48 lines were issued film images. 

1929 - The BBC began a regular transmission. 

1930 - The U.S. broadcasters NBC and CBS began broadcasting the...