# Signal Spectra and Bandwidth

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• Created by: apple87
• Created on: 02-05-15 14:27
What are the frequencies that make up a signal called?
Its spectrum
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How can you get information about the frequencies within a signal?
By drawing a graph.
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What is bandwidth?
The range of frequencies within a signal.
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How can you find the bandwidth?
Subract the lowest frequency from the highest frequency or by looking at the sprectrum on the graph.
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What does the bandwidth determin?
How many signals can be sent at the same time.
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Why are carrier waves used?
So different signals don't interfere with eachother.
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What type of wave is mixed with a communication signaal?
Carrier wave
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Why must there be a gap between frequencies?
To stop neighnouring signals from overlapping.
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Why is the problem with having gaps between frequencies?
Limits the number of signals that can be transmitted.
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What is the formula for calculating rate of transmission?
Samples per second x Bits per sample
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What two factors does the rate of transmission depend on?
The number of samples per second- must be atleast twice the highest frequency so all frequencies are transmitted. The number of bits per sample- Must be high enough to the signal transmitted closely matches the original.
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## Other cards in this set

### Card 2

#### Front

How can you get information about the frequencies within a signal?

#### Back

By drawing a graph.

### Card 3

#### Front

What is bandwidth?

### Card 4

#### Front

How can you find the bandwidth?

### Card 5

#### Front

What does the bandwidth determin?