Other related terms, especially those concerned with modulation, may be found in Section D3 Communications technology.

Electronic recording and reproduction of natural sound has been available for many decades, through the use of tape recorders or gramophones. Similarly, the ability to generate natural sounds electronically – sound synthesis – was developed long before computers. What is relatively recent is the ability to process sound on computer equipment that is affordable by the consumer.

Sound is produced by the continuous vibration of air. This means that it has analog properties. The electrical output from a microphone consists of a continuously fluctuating voltage and has to be converted into a digital form if it is to be stored ...

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