| Sound / Speech | ||
| The process of converting analogue
sound to digital data is called sampling.
At evenly spaced intervals, the sound is measured and converted into
numbers. The more frequently the sampling is done, the better the sound quality
but greater storage is required.
Sound may be input using a microphone - but analogue signals will need to be converted to digital using an analogue-to-digital converter. |
Once sound has been
digitised, it can be edited by a computer - eg the scratches on an old
recording can be edited out.
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| Sound may also be input from a digital device with MIDI (Musical Instrument Digital Interface) eg a musical keyboard |  |
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| Speech may be input
using a microphone. The computer will then analyse the sound and process
the data.
Examples :
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| Exercise : Sound/speech | ||
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sound signals can be converted to
data
using sound
. The digital data can then be processed by a computer.
The
of the sound sampling affects the quality and the size of the
sound data.
Sound may be input using MIDI (Musical Instrument Digital Interface) instruments. (eg keyboard). Voice recognition systems use speech input using a . This is useful for dictation systems or users who cannot use their hands for typing eg surgeon, fighter pilot.
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| (Green indicates success) | ||
