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Electronics

Difference between analogue and digital signals

  • 5 things to know
  • Paper 3, section B

Overview

Bits and bytes, sampling rate, quantisation, and pulse code modulation.

What you need to know

Answer each one before you reveal it.

Your recallNot started
Numbers

What is a bit, how many make a byte, and how is decimal 5 written in binary?

Numbers

What are sampling, sampling rate and quantisation?

Numbers

How do bits per sample relate to quantisation levels and signal quality?

Evaluation

What practical disadvantage arises from converting between analogue and digital?

Key term

What is noise in communication systems?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is a bit in digital systems?

    Model answer

    A bit is the smallest unit of digital information, representing a single binary digit (0 or 1).

  2. 2

    How many bits make up one byte?

    Model answer

    8 bits.

  3. 3

    What is the binary representation of the decimal number 5?

    Model answer

    101

  4. 4

    What is the binary representation of the decimal number 7?

    Model answer

    111

  5. 5

    What is the binary representation of the decimal number 10?

    Model answer

    1010

  6. 6

    What is the binary representation of the decimal number 8?

    Model answer

    1000

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