System block diagrams
see p.73
What you need to know •
The purpose of system block diagrams
•
How to interpret system block diagrams.
The systems approach allows electronic systems to be communicated clearly and effectively. It involves the use of block diagrams to show the different inputs, processes and outputs that will be used.
The systems approach A block diagram gives a top-down overview of a system. The blocks represent groups of components, or subsystems.
•
The arrows show the signals that flow between them.
FT
•
Input
Block diagrams
Process
Output
An input device takes an environmental signal and turns it into an electronic signal. For example, a light sensor.
•
A process device changes the electronic signal in some way. For example, by turning it on for a set amount of time.
•
An output device turns the electronic signal back into an environmental signal. For example, a buzzer produces sound.
R
A
•
Process
Output
Light sensor
Timer
Buzzer
D
Light level
Input
Electronic signal
Sound Electronic signal
Practise it!
Remember it!
1
A block diagram shows a top-down overview of a system in terms of its inputs, processes and outputs.
2
State what is represented by each of the following in a block diagram: (a) the blocks
(1 mark)
(b) the arrows.
(1 mark)
Name the three types of blocks used in a systems diagram. (3 marks)
Revision Guide
27
Original material © Cambridge University Press 2022. This material is not final and is subject to further changes prior to publication.
