Sound input and output

Sound card and speaker
Many computers especially home computers are equipped with speakers. Speakers take the signal genarated by a sound card and convert it into sound.
If your computer has speakers you can listen to music CD's or hear sound effects genarated by software. This capability is often used by educational softwares and computer games.

Speech Synthesiser

A speech synthasiser receied a output of a computer and turn it into speech played throught the speaker.
A microphone can be attached to a sound card provide audio input with suitable software a microphone can also be used to issue commands and create files.

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