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TV and digital

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by

Harvey Buckle

on 24 August 2017

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Transcript of TV and digital

Aim
To know the thinking behind AM and FM
To know the technology and advantages of digital
✳✱*
Starter
Difference between these?
AM vs FM
A wave that has been modified to carry a signal is said to have been modulated. There is more than one way to do this.
FM radio and AM radio (Frequency Modulated and Amplitude Modulated) are two ways in which radio waves are transmitted.
In Amplitude Modulation, the radio wave varies in amplitude to match the changes in the sound wave.
In Frequency modulation, the radio wave varies in frequency to match the changes in the sound wave.
Radio, TV and digital communicating
24th August 2017
Digital!!!!
Digital signals are a series of pulses consisting of just two states, ON (1) or OFF (0). There are no values in between. The sound is converted into a digital code of 0s and 1s.
Now in groups of two...
Look at page 329

Describe how mobile phones work. Wriite down your findings.
Advantages
Digital signals carry more information per second than analogue signals. This is the same whether optical fibres, cables or radio waves are used.
Digital signals maintain their quality over long distances better than analogue signals. You will notice far less noise and crackle in a DAB radio programme than in an ordinary FM or AM radio programme.
Questions!!
Questions 3-5 p.327
Full transcript