Digital Audio - Digital/Analogue Conversion

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Once we have a signal's sample, we can generate a new signal from it by using a Sample & Hold-filter. Each sample states the signal's voltage at a certain instant in time. The Sample & Hold-filter keeps the voltage constant until it is the next sample's turn to be elaborated which will bring the voltage to a new value and so forth.

The following figure shows the resulting signal:

Digital Audio - 'Step' Wave-form

'Step' Wave-form

What will result is a wave-form in the shape of "steps" which recovers the original signal. The last operation we need to perform consists in removing the "steps", which are in actual fact, abrupt transitions. In practice this means that we have very high frequencies which therefore must be removed using a low-pass filter with a 20 KHz bandwidth, thus allowing the audio signal's frequencies only.

By now we have managed to recover our analogue audio signal and we're ready to send everything to the loudspeakers through an amplifier and sit back and listen.


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