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GCSE     Signal     >Bandwidth<     Communication     Distortion     Noise     Waves    

Signal Bandwidth


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Analogue Bandwidth - Everyone

This is the range of frequencies where the output voltage is at least 70% ( 1 / √2 ) of the maximum output voltage.

Bandwidth is also the capacity of a circuit or channel to carry information. More bandwidth = more information.

Measured in Hertz / Kilohertz / Megahertz / Gigahertz

Voltage Bandwidth

Power Bandwidth - AS and A Level

Digital Bandwidth

Measured in bits per second.

Example: An Internet connection.

Data Compression

Data compression can be used to make better use of the available bandwidth. There are techniques for removing information that the ear would not notice.

There is an audio compression technique which discards some of the voice transmission and repeats samples to fill the gaps caused by the discarding. This is quite intelligible but sounds odd and unnatural. For example some "ssss" or "t" sounds get exagerated or could go missing. Skype or facetime over slow connections might show these effects.

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