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Slide 1

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Development In Devices
Gramophones
· The phonograph was invented in 1877 by Thomas
Edison.
· While other inventors had produced devices that
could record sounds, Edison's gramophone was the
first to be able to reproduce the recorded sound.
· However Alexander Graham Bell made several
improvements to the phonograph in 1880s and Emile
Berliner started the transition from phonograph
cylinders to gramophone records. She patented the
gramophone in 1887.
Crystal Sets
· It needs no battery or power source and runs on the
power received from radio waves by a long wire
antenna.
· Crystal radios were the first widely used radio
receiver, and the main type used during the early
1900s.
· Sold and homemade by the millions, the cheap and
reliable crystal radio was a major driving force in the
introduction of radio to the public, contributing to the
development of radio as entertainment around 1920.
Transistor radio
· A transistor radio is a small portable radio receiver
that uses transistor-based circuitry.
· After their development in 1954 they became the
most popular electronic communication device in
history, with billions manufactured during the 1960s
and 1970s.
· Their pocket size generated a change in popular
music listening habits, allowing people to listen to
music anywhere they went.
.…read more

Slide 2

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Walkman
· A personal stereo audio cassette player, called
Stereobelt, was first invented by the German-Brazilian
Andreas Pavel in 1979. Sony, however, began selling
the popular Walkman in1976 (a similar device) leading
to some serious legal battles.
· Similar to its predecessor it allowed people to listen on
the go but with headphones .
· Walkman as a brand is still sold today but its products
arte very different from what Sony started with in the
seventies.
DAB radio
· Digital Audio Broadcasting (DAB) is a digital radio
technology for broadcasting radio stations, used in
several countries, particularly in Europe. As of 2006,
approximately 1,002 stations worldwide broadcast in
the DAB format.
Types of radio
Pirate Radio
· Pirate radio is illegal or unregulated radio transmission for entertainment
or political purposes. While pirate just refers to the illegal nature of the
broadcasts, there have also been notable pirate offshore radio
transmissions
Commercial Radio
· Commercial broadcasting is the broadcasting of television programs
and radio programming by privately owned corporate media. It was the
United States first model of radio during the 1920s, in contrast with the
public television model in Europe during the 1930s, 1940s and 1950s
which prevailed worldwide (except in the United States) until the 1980s.
Public Radio
· Public radio primary mission is public service. Public radios like the
BBC franchise receive funding from diverse sources including license
fees.…read more

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