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communications
All the auditory and visual signals humans use to transmit messages, either directly or through channels and equipment.
writing instruments
The first true writing instruments were made by the Sumerians in Mesopotamia nearly 5,000 years ago.
newspaper
Usually daily publication whose main purpose is to report and comment on the latest news of society, politics, the arts, sports and other areas of interest.
miscellaneous symbols
Symbols are standardized marks used to refer concisely to a thing, a being or a concept.
broadcast satellite communication
Transmission of television signals (pictures and sound) to the general public by means of radio waves relayed by satellite.
telecommunications by satellite
Transmission of data such as images, sound and computer data using radio waves relayed by satellites.
telecommunication satellites
Space vehicles placed into geostationary orbit at an altitude of 36,000 km to receive and broadcast long-distance signals in the form of radio waves.
radio: studio and control room
Area with two rooms separated by a glass window where audio programs are produced, recorded or broadcast.
dynamic microphone
Device with a moving coil traveling in a magnetic field that converts sounds into electric pulses for broadcasting or recording.
mini stereo sound system
Sound reproduction system with miniaturized components (including ampli-tuner, speakers and reader).
portable sound systems
Small self-contained sound reproduction equipment that can be carried easily from one place to another.
typography
General term for the graphic representation of characters printed on a material or surface, with or without the use of letterpress.
public postal network
Infrastructure with which the national postal service delivers the mail entrusted to it.
photography
Process that captures an image on a light-sensitive surface by admitting light through a shutter.
television
The first long-distance transmission of black and white pictures took place in the 1920s; color television was introduced in 1951.
sound reproducing system
System for reproducing sound that consists mainly of a tuner, playback equipment, an amplifier and loudspeakers.
wireless communication
Transmission of voice or alphanumeric messages by radio waves; it uses small devices that are equipped with a transmitting or receiving antenna.
