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In Reply to: RE: Looking for good 64 bit player posted by fmak on November 5, 2010 at 16:45:50:
I think there are different "64 bit" things going on, not to be confused:
1. The precision used in the DSP calculations (e.g. filters). Here 64 bit floating point is essential because it provides the needed 48 bits of resolution to reduce round-off errors in the complex calculations,
2. The precision used in audio file formats (e.g. 24 bit fixed point, 32 bit floating point). Some software uses 64 bit internal calculations but "bounces" the final data to 32 bits before going into a file,
3. The address size used in CPU instructions, e.g. 32 bits in length or 64 bits in length. You will need a 64 bit processor to directly address more than 4 GB of RAM memory.
It is possible to use 64 bit calculations and 64 bit file formats in with a 32 bit processor and operating system. Indeed, the 32 bit processors will also do 64 bit calculations. It's only if you have very memory intensive applications that there is much to be gained by going to a 64 bit system, and the extra size of instructions is likely to actually reduce performance unless the extra memory capability is exploited. I run the 64 bit iZotope SRC in Soundforge Pro 10, and here it will support both 32 bit and 64 bit floating point. The (slightly newer) version in iZotope RX Advanced uses 64 bit calculations, but doesn't support the 64 bit floating point in the file format. A further confusing factor is that the WAV file format itself is limited to 32 bit addressing in the file (4 GB) if the standard Microsoft WAV format is used. (There are variants that allow for extended addressing.)
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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- RE: Looking for good 64 bit player - Tony Lauck 11:43:38 11/06/10 (0)
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