Waves and Communications

Cards (13)

what is meant by analogue signals?
Continuous signals that vary in amplitude and frequency.
what are examples of analogue signals?
Sound waves, radio signals, and temperature sensors are examples of analogue signals.
what is meant by digital signals?
Signals that are represented by discrete values or binary digits (0s and 1s) in electronic devices and communication systems.
what are examples of digital signals?
Internet, Bluetooth, Wi-Fi, digital radio and smartphones
what is an ADC?
Analog-to-Digital Converter
How does an ADC work?
it samples the signal
many times a second it looks at the value of the signal and converts it to binary code
what is sampling rate?
how many samples taken every second
what is sampling sensitivity?
how accurate the sampling will be
what are advantages of digital signal?
can carry a lot more information, less interference, higher quality, more reliable
what are disadvantages to digital signals?
Data accuracy can be affected by sampling settings.
Time delay due to signal processing.
mobile phones in communications
it has its own transceiver that receives and send signals.
frequencies from 800MHz - 2.6GHz
they are all networked together to cover the country
Bluetooth in communications
do not need to connect to a local hub, they communicate with each other
range is limited to 10m
doesn't use a lot of power
cannot carry a lot of information
infra red in communications
range of a few metres
need a clear line of sight to work
frequency of pulses is around 40kHz