Презентация к уроку английского языка "TELEVISION AND TELECOMMUNICATION" -

TELEVISION AND TELECOMMUNICATION
Meaning of TV.
TV in process of development.
TV systems in close up.
Conclusion

Television is a widely used telecommunication medium for sending (broadcasting) and receiving moving images, either monochromatic (blаcк and white) or colour, usually accompanied by sound.

ln its early stages of development, television included only those devices employing a combination of optical, mechanical and electronic technologies to capture, transmit and display a visual image.

In 1884 Paul G. Nipkow, a 20-year old university student in Germany invented the first electromechanical television system which employed a scanning disk, a spinning disk with a series of holes spiraling toward the center, for rasterization.

The holes were spaced at equal angular intervals such that in a single rotation the disk would allow light to pass through each hole and onto a light-sensitive selenium sensor which produced the electrical pulses. As an image was focused on the rotating disk, each hole captured a horizontal "slice" of the whole image.

Attempts of its improvement didn't stop up to the beginning of the 1930th years, and mechanical television appeared for the first time on air.

Conclusion
20 century
19 century
21 century
Invented the first electromechanical television system in 1884 of Paul G. Nipkow
Karl Braun in 1927 invented televisions depended also upon the cathode-ray tube.
Liquidly - the Crystal(LC) TV

Thanks For Your attention!