Unit 13 · Information and Communication TechnologyTelecommunication
Words of This Topic
- telecommunication: a system that sends signals far away through wires or waves
- communication signal: a signal that carries information
- transmitter: the device that turns information into a signal ready to be sent
- channel: the path a signal travels along
- receiver: the device that picks up a signal and changes it into a useful form
- ionosphere: a high layer of the atmosphere that reflects some radio waves
- carrier wave: a radio wave of steady frequency that carries information
- modulation: changing the carrier wave to match the information
- demodulation: taking the information back out of the carrier wave
- amplitude: the height of a wave
- frequency: the number of waves made in one second