Bit depth/rate
Bit depth/rate – when an analogue signal is digitised, one of the values applied is the bit depth. This is the length of the ‘digital word’ and relates to the range of amplitudes that can be measured by the a/d converter. When the converter measures the sound, the amplitude may be either increased or decreased to fit into a set bit depth. This is called quantising. Therefore the greater the number of bits the converter is capable of processing, the smaller the quantisation that needs to be applied. This means that higher bit depths result in better-quality a/d conversion. Typically, standard cds have a bit depth of 16, but it is not unusual to find digital devices capable of 20-, 24- or even 32-bit resolution.
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