Analogue and digital
Cards (8)
- Analogue signals are continuous signals that can take on any value within a range. They vary smoothly and represent information as a continuous wave or signal that changes continuously over time
- ANALOGUE SIGNALS:Key characteristics:
- Smooth and continuous
- Can have infinite possible values
- Represented by a continuous wave
- Directly proportional to the original information
Example: A traditional sound wave or vinyl record groove are classic representations of analogue signals. The sound wave's amplitude varies smoothly and continuously, just like the original sound. - Digital signals are discrete signals that represent information using binary code (0s and 1s).
- DIGITAL SIGNALS:Key characteristics:
- Discrete/stepped values
- Only two possible states (0 or 1)
- Precise and exact representation
- Easier to store and transmit
Think of a digital signal like a staircase:- Each step is a distinct level
- No smooth transitions
- Clear, sharp changes between levels
Example: Computer data, binary code, and digital clocks are perfect representations of digital signals. Each piece of information is represented by a specific combination of 0s and 1s. - The stairway with distinct steps best illustrates the characteristics of a digital signal, where there are only specific, discrete levels rather than a smooth, continuous change.The LEGO steps analogy shows how digital signals are made up of clear, separate levels, just like a staircase, rather than a gradual, smooth incline.
- Analogue signals are smooth and continuous with infinite possible values, while digital signals have discrete steps and use only 0s and 1s.
- Real-world analogue signal examples:
- Sound Waves
- Natural human voice
- Vinyl record recordings
- Acoustic guitar vibrations
- Real-world digital signal examples:
- Computing
- Binary computer code
- Digital photographs
- Computer processor signals
- Communication
- Mobile phone text messages
- Email transmissions
- Digital radio/TV broadcasts