Flashcards
P2 Revision Flash Cards x
Cards in this deck (10)
- 1Define an analogue signal.A signal in analogue format is likely to be a wave from with varying frequency and/or amplitude
- 2Define a digital signal.Digital signals work as an 'on' and 'off' pulse of a wave. This series of pulses would be understood by a computer as a series od 1's and 0's.
- 3What happens to an analogue signal when it travels?Noise is added, signal weakens, amplitude decreases.
- 4What happens after an analogue signal goes through an amplifier?The signal and noise are both amplified (which means there is more interference and the sound quality decreases).
- 5What happens to a digital signal when it travels?Noise is added, signal weakens, amplitude decreases.
- 6What happens after a digital signal has gone through a regenerator?Removes noise, amplifies signal (which means there is less interference and the sound quality is improved).
- 7What are the advantages of digital signals?-Can transmit several signals at once (more information per second)
-Less effected by interference (higher quality)
-Can be processed by computers
-Doesn't take up as much storage space as analogue signal - 8Name some devices that use analogue signal.-Video
-Tapes
-Record
-Old TV's - 9Name some devices that use digital signal.-Kindle
-Mobile Phone
-Hard-Drive on computer
-DVD
-SD Card (Camera)
-CD
-Digital TV's - 10What do 'FM' and 'AM' mean?FM= Frequency Changes
Am= Amplitude Changes
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- Flashcards on P2 Revision Flash Cards x, created by emcdonaldw11 on 06/03/2015.
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