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In Reply to: In my mind there is only one way to compare format (a) to format (b) posted by Presto on February 13, 2015 at 14:08:11:
What I do is to take an original hi-res digital file and down sample it to low res, then upsample it back to the original hi-res format. This gives me two digital files in the same format. The only source of the differences is format conversions. I then play the two files back on the identical playback chain.
This will tell me what is lost in the downsampling process. The process I use has a lot of settings and I can vary these. These will cause different types of distortions, mostly audible. This software is the best available and will, for instance, upsample low res to high res and back down to the original low res transparently. So it is a reasonable presumption that the differences are necessitated by the formats, not the software. It is possible to do different tests to assess some of the potential issues, of which the biggest one is round-off errors/dithering which adds noise.
If you use "identical" ADCs to capture and "identical" DACs to play back different formats you will be using different DSP processing, so you will have the same software variance involved. In addition, the processing in the converters will add digital noise, making bits not just be bits. Therefore this method will not be perfect either.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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- RE: In my mind there is only one way to compare format (a) to format (b) - Tony Lauck 02/13/1514:21:54 02/13/15 (0)
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