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Systems and Signal Processing
Quick questions on The input-process-output model explained: O-Level Electronics Systems and Signal Processing
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are the three blocks?Show answer
The systems model splits any electronic system into three stages:
What is drawing a block diagram?Show answer
A block diagram shows each stage as a labelled rectangle, joined by arrows that show the direction of signal flow. Label each block with what it does (for example "light sensor", "switching circuit", "lamp") and, if asked, name a component for each. The diagram reads left to right: input on the left, output on the right, process in between.
What is mapping a real circuit onto the model?Show answer
To analyse a circuit, ask of each part: does it sense (input), decide or change the signal (process), or act on the world (output)? An automatic night light maps to an LDR (input), a comparator or transistor (process) and a lamp (output). The same three-block pattern fits a temperature alarm, a radio and a washing-machine controller.
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