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ENGINEERING, TE 2024 HSC 4 MC

Which row of the table correctly identifies characteristics of analogue and digital communications?

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→ Analog signals are continuous and more susceptible to degradation while digital signals are discrete (binary) and less susceptible to degradation since they can be regenerated and error-corrected during transmission.

ENGINEERING, TE 2017 HSC 16 MC

Television programs that show high levels of activity often have lower picture quality.

This is because television signals are transmitted using

  1. digital modulation at low compression levels.
  2. digital modulation at high compression levels.
  3. analogue modulation at low compression levels.
  4. analogue modulation at high compression levels.
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→ Modern television signals are transmitted using digital modulation, so the answer must be A or B.

→ The lower picture quality is the result of the TV being unable to decompress the highly compressed signal quickly.


♦♦ Mean mark 39%.

ENGINEERING, TE 2020 HSC 26b

Outline benefits of digital signal transmission.   (3 marks)

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Benefits of digital signal transmission include:

→ Immunity to transmission noise and interference (clearer signal)

→ Signal can be boosted or regenerated along the transmission path (reduced attenuation)

→ Can be encrypted to be kept secure and private

→ Signals can be processed and multiplexed (multiple messages can be sent along the same channel simultaneously)

→ Error detection and correction is possible

→ Cheaper than analogue transmission

→ Signal can be compressed

→ Signal can be stored and further processed

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Benefits of digital signal transmission include:

→ Immunity to transmission noise and interference (clearer signal)

→ Signal can be boosted or regenerated along the transmission path (reduced attenuation)

→ Can be encrypted to be kept secure and private

→ Signals can be processed and multiplexed (multiple messages can be sent along the same channel simultaneously)

→ Error detection and correction is possible

→ Cheaper than analogue transmission

→ Signal can be compressed

→ Signal can be stored and further processed

ENGINEERING, TE 2021 HSC 11 MC

Which radio transmission method is most likely to have static interference?

  1. Amplitude modulation (AM)
  2. Frequency modulation (FM)
  3. Digital audio broadcast (DAB)
  4. Pulse width modulation (PWM)
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By Elimination:

→ Digital broadcasting will have very little interference (eliminate and )

→ The higher frequency of FM output results in less static than AM (eliminate )