موضوع
انجليزي عن broadcasting
موضوع انجليزي عن broadcasting
Technical
Broadcast is a term used for broadcasting
standards and tools in the audiovisual field. In other words, a broadcast
designates both a program, that is to say a program that presents information,
and the action of making it public, which corresponds to broadcasting.
Broadcasting is
the transmission of signals via electromagnetic waves intended to be received
directly by the general public and applies to both individual reception and
community reception. This service may include audio, television or other types
of programming1,2,3. This is a form of radiocommunication.
The term radio
is often used for the entire chain of design and production of radio broadcasts,
transmission with radio transmitters and reception through radios
Transmission of
sounds
Radio receiver.
Broadcasting
defines the transmission of sounds: the human voice and the audio signals by
the waves. In a radio transmitter, the sounds are transformed into low
frequency electrical signals (modulation signals), they are superimposed on a
high frequency wave (carrier wave) and sent into an antenna that transforms
them into electromagnetic waves.
Low frequency
broadcasting uses the so-called GO or "long wave" range, from 150 to
280 kHz. This range, historically the first used in broadcasting in Europe,
still has transmitters
