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In page Motorola 56000:

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24 bits was selected as the basic word length because it gave the system a reasonable number range and precision for processing audio (sound), the 56000's main concern.[citation needed] 24 bits correspond to a dynamic range of 144 dB, sufficient in the 1980s when analog-to-digital converters (ADCs) and digital-to-analog converters (DACs) rarely exceeded 20 bits. One example is ADSL applications, where filters typically require 20 bits of accuracy. The leftmost four bits are typically considered ample headroom to avoid overflow in calculations.