Waves In Communication
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What is the amplitude of digital signals?
The signal can only have one amplitude
What are some examples of digital signals?
Internet, mobile phone, Bluetooth, digital TV, digital radio
What are digital signals made of?
Made up of binary digits or bits (10110)
What is that amplitude of analogue signals?
Amplitude can vary
What does ADC mean?
Analogue to digital converter
What does a ADC do?
It uses a process called sampling it looks at the value of the signal and converts to binary code
What are the factors that affect the quality of digital signals?
Sampling rate - how many samples are taken per second sampling sensitivity - how close together the samples are (how accurate the sampling will be)
How is a picture converted into digital
The picture is split up into pixels The colour of each pixel has a binary code
What are the advantages of digital signals?
Digital signals can carry more information in the same bandwidth (the electromagnetic spectrum) If it pick up interference it is easier to filter is out (because it’s easier to recognise it) Computer memory and processing is digital
What are the disadvantages of digital signals?
Signal processing takes time so there may be a delay (however nowadays this is not much of a problem due to lots of boardband) Quality depends on sampling settings e.g sampling rate, number of pixels
How do we avoid interfering with others signals?
The government allocates bandwidth to each one (part of the whole spectrum) Phones can’t use the same bandwidth as radios