Bit depth
Bit depth The size of the number that records each digital sample. Since the system is digital, the number relates to powers of two. The compact disc uses a bit depth of 16, which allows 65,536 different levels to be used to track the analogue source signal. DVDs usually also use 16, but may also use 20 bits (which gives over a million levels) or 24 bits (which gives more than 16.7 million levels). The greater the bit depth, the lower the harmonic distortion and quantization noise, and the more storage space required for the signal. Audio recording studios use 20bit and 24bit, which is reduced down to16 bit for compact disc. Specialist audio companies are now offering 20 or 24 bit audio for download, this offers super audio CD quality and above.
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