elunxp 說的應該差不多了...
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the bit depth of an audio file (i.e. 16bit, 24bit). Each bit is nominally 6dB worth of dynamic range - so 16bits gives you a theoretical 96dB worth of dynamic range while 24bit gives you a whopping 144dB (where as human hearing at the very best has 120dB worth of dynamic range). It's important to realize that even 32bit audio files are output by all modern proaudio Digital to Analog Converter at 24bits. The reason that no DAC ever needs to be designed to actually output at 32bits is that the least significant 24th bit is very well below the noise floor of any environment, and also well below the human ear's ability to detect sound.
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the bit depth of the internal processing math (which can either be floating point or fixed point). What this means is how many digits calculations occur at - bigger bit depths (i.e. more digits to work with) means more precise calculations. SAW uses
64bit fixed point math for its multiplication and division. Most other native PC based DAW apps use 32bit floating point for this. The SAWStudio built in eq, the Anwida and JMS Audioware SAW native plugins, and
some of the filter codes used in the Sonoris SAW native plugins use
64bit floating point math.
(Most of the Sonoris stuff calculates at 64bit integer http://www.sonoris.nl)
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the bit depth of the returned figures after a DSP has been performed - i.e. after a signal process is done, how many digits are passed to the next signal process prior to output. In SAW this is at 32bit fixed point using the full DWORD. With most other PC based DAW appps this is a 24bit + 8bit mantissa 32bit IEEE floating point file.
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the bit depth of a computer's buss, cpu, or OS - basically the allowable throughput of data chunks the cpu or buss or OS can pass or process at once. Bigger depths for these functions means more calculations can occur at once - so you get faster speeds - but it does not necessarilly mean that the quality of calculations has changed as this is dependent on the processing algorithm being run. A 32bit OS (such as Windows 2000) can still perform calculations using
64bit math!
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本帖最后由 himhui 于 08-5-7 00:22 编辑 ]