Презентация к уроку "The history of TV"

The history of Tv.

Introduction

Television (TV), is a telecommunication medium used for transmitting moving images in monochrome (black and white), or in color, and in two or three dimensions and sound. The term can refer to a television set, a television show, or the medium of television transmission. Television is a mass medium for advertising, entertainment, news, and sports.


Main elements of TV

The video source is the image or program. It can be a TV show, news program, live feed or movie. Usually the video source has already been recorded by a camera.Second element is audio source. Besides the video source, we also need the audio source. Practically all movies, TV shows and news programs have some sought of audio. Audio source can be in the form of mono, stereo or digitally processed to be later played back with surround sound.The transmitter is necessary for broadcast television companies that broadcast a free signal to viewers in their area.

Main elemets of Tv

The transmitter transmits both the video and audio signals over the air waves. Both audio and video signals are electrical in nature and are transformed into radio waves which can then be picked up by receivers (your TV set). A transmitter not only transmits one channels audio or video signal, but in most cases many different channels.A receiver is usually integrated in your TV set and this receiver is able to grab radio waves (the transmitted signal) and process these radio waves back to audio and video electric signals that can now be played on your TV set.

Main elemets of TV

A display device is usually a TV set, but can also be just a monitor. The display device is able to receive electrical signals (usually sent from the receiver) and turn these electrical signals to a viewable image. Most standard TV sets incorporate a cathode ray tube (CRT), however new display devices can include LCD (liquid crystal display) and Plasma (gas charged display) display devices among others.While most sound devices are built into your TV set in the form of speakers

Main elements of TV

Audio signals are obviously needed to match up with the video being shown to the viewer. Many newer TV sets have outputs to send the TV sound to high quality speakers that reproduce sound much better. Since audio signals can include surround sound technology, the TV set is able to send audio signals to the proper speakers located around your room.


Inventors and inventions in TV history

Paul Julius Gottlieb Nipkow (22 August 1860 – 24 August 1940) was a German technician and inventor. He invented the Nipkow disk, which laid the foundation of television, since his disk was a fundamental component in the first televisions.

Inventors and inventions in TV history

John Logie Baird ( 13 August 1888 – 14 June 1946) was a Scottish inventor, electrical engineer, and innovator who demonstrated his working television system on 26 January 1926. He went on to invent the first publicly demonstrated colour television system, and the first viable purely electronic colour television picture tube.