Signals

Question 1

Advantage of using digital rather than analogue signals

Answer 1

• interference can be removed
• can be reproduced exactly
• clearer

Question 2

Everyday uses of digital signal

Answer 2

• TV digital reception

* digital radio

Question 3

Why do different frequencies require different sizes of loudspeakers

Answer 3

• waves spread out as they leave speaker
• different frequencies have different wavelengths
• diffract most of speaker size matches wavelength
• giving a more even sound