Communications
COMMUNICATIONS
All the auditory and visual signals humans use to transmit messages, either directly or through channels and equipment.![writing instruments [1]](/images/communications/communications/writing-instruments_1.png "writing instruments [1] image")
writing instruments [1]
The first true writing instruments were made by the Sumerians in Mesopotamia nearly 5,000 years ago.![writing instruments [2]](/images/communications/communications/writing-instruments_2.png "writing instruments [2] image")
writing instruments [2]
The first true writing instruments were made by the Sumerians in Mesopotamia nearly 5,000 years ago.![writing instruments [3]](/images/communications/communications/writing-instruments_3.png "writing instruments [3] image")
writing instruments [3]
The first true writing instruments were made by the Sumerians in Mesopotamia nearly 5,000 years ago.![writing instruments [4]](/images/communications/communications/writing-instruments_4.png "writing instruments [4] image")
writing instruments [4]
The first true writing instruments were made by the Sumerians in Mesopotamia nearly 5,000 years ago.![newspaper [1]](/images/communications/communications/newspaper_1.png "newspaper [1] image")
newspaper [1]
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.![newspaper [2]](/images/communications/communications/newspaper_2.png "newspaper [2] image")
newspaper [2]
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.
typography
General term for the graphic representation of characters printed on a material or surface, with or without the use of letterpress.
miscellaneous symbols
Symbols are standardized marks used to refer concisely to a thing, a being or a concept.
punctuation marks
All the standardized marks used to divide a text in order to make it more legible.
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.-camera-front-view.png "single-lens reflex (SLR) camera: front view image")
-camera-camera-back.png "single-lens reflex (SLR) camera: camera back image")
![lenses [1]](/images/communications/communications/photography/lenses_1.png "lenses [1] image")
![lenses [2]](/images/communications/communications/photography/lenses_2.png "lenses [2] image")
![lenses [3]](/images/communications/communications/photography/lenses_3.png "lenses [3] image")
![still cameras [1]](/images/communications/communications/photography/still-cameras_1.png "still cameras [1] image")
![still cameras [2]](/images/communications/communications/photography/still-cameras_2.png "still cameras [2] image")
![still cameras [3]](/images/communications/communications/photography/still-cameras_3.png "still cameras [3] image")
![photographic accessories [1]](/images/communications/communications/photography/photographic-accessories_1.png "photographic accessories [1] image")
![photographic accessories [2]](/images/communications/communications/photography/photographic-accessories_2.png "photographic accessories [2] image")
![darkroom equipment [1]](/images/communications/communications/photography/darkroom-equipment_1.png "darkroom equipment [1] image")
![darkroom equipment [2]](/images/communications/communications/photography/darkroom-equipment_2.png "darkroom equipment [2] image")
![darkroom equipment [3]](/images/communications/communications/photography/darkroom-equipment_3.png "darkroom equipment [3] image")
![darkroom equipment [4]](/images/communications/communications/photography/darkroom-equipment_4.png "darkroom equipment [4] image")
![darkroom equipment [5]](/images/communications/communications/photography/darkroom-equipment_5.png "darkroom equipment [5] image")
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 22,000 mi 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 [1]](/images/communications/communications/dynamic-microphone_1.png "dynamic microphone [1] image")
dynamic microphone [1]
Device with a moving coil traveling in a magnetic field that converts sounds into electric pulses for broadcasting or recording.![dynamic microphone [2]](/images/communications/communications/dynamic-microphone_2.png "dynamic microphone [2] image")
dynamic microphone [2]
Device with a moving coil traveling in a magnetic field that converts sounds into electric pulses for broadcasting or recording.
television
The first long-distance transmission of black and white pictures took place in the 1920s; color television was introduced in 1951.![mobile unit [1]](/images/communications/communications/television/mobile-unit_1.png "mobile unit [1] image")
![mobile unit [2]](/images/communications/communications/television/mobile-unit_2.png "mobile unit [2] image")
![mobile unit [3]](/images/communications/communications/television/mobile-unit_3.png "mobile unit [3] image")
-television.png "cathod ray tube (CRT) television image")
![picture tube [1]](/images/communications/communications/television/picture-tube_1.png "picture tube [1] image")
![picture tube [2]](/images/communications/communications/television/picture-tube_2.png "picture tube [2] image")
.png "videocassette recorder (VCR) image")
sound reproducing system
System for reproducing sound that consists mainly of a tuner, playback equipment, an amplifier and loudspeakers.
mini stereo sound system
Sound reproduction system with miniaturized components (including ampli-tuner, speakers and reader).![portable sound systems [1]](/images/communications/communications/portable-sound-systems_1.png "portable sound systems [1] image")
portable sound systems [1]
Small self-contained sound reproduction equipment that can be carried easily from one place to another.![portable sound systems [2]](/images/communications/communications/portable-sound-systems_2.png "portable sound systems [2] image")
portable sound systems [2]
Small self-contained sound reproduction equipment that can be carried easily from one place to another.![portable sound systems [3]](/images/communications/communications/portable-sound-systems_3.png "portable sound systems [3] image")
portable sound systems [3]
Small self-contained sound reproduction equipment that can be carried easily from one place to another.![portable sound systems [4]](/images/communications/communications/portable-sound-systems_4.png "portable sound systems [4] image")
portable sound systems [4]
Small self-contained sound reproduction equipment that can be carried easily from one place to another.
wireless communication
Transmission of voice or alphanumeric messages by radio waves; it uses small devices that are equipped with a transmitting or receiving antenna.
![examples of telephones [1]](/images/communications/communications/communication-by-telephone/examples-telephones_1.png "examples of telephones [1] image")
![examples of telephones [2]](/images/communications/communications/communication-by-telephone/examples-telephones_2.png "examples of telephones [2] image")
![examples of telephones [3]](/images/communications/communications/communication-by-telephone/examples-telephones_3.png "examples of telephones [3] image")
-machine.png "facsimile (fax) machine image")
