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In Reply to: RE: Attribution error? posted by audioengr on January 29, 2015 at 09:57:00:
You are confusing alias distortion with image distortion. Alias distortion occurs when digitizing an analog signal or downsampling a digital signal. Image distortion occurs when upsampling a digital signal or converting it to analog. These have very different audible effects. With 44 Khz digital, alias distortion creates spurious frequencies in the band below 22 kHz. Image distortion at 44 kHz creates spurious frequencies in the band above 22 kHz. Alias distortion is grossly audible with test tones and not difficult to hear on music with lots of high frequency content that should have been filtered. Image distortion is harder to discern unless there is a lot of high frequency non-linearity on the part of the playback chain.
I base my comments on both theory and practice. I have generated test dones and done various sample rate conversions and measured and listened to the results. I have done the same conversions with music and listened to the results. It is not particularly hard to hear these effects if one experiments with sample rate conversions, starting with a pure analog signal or a high resolution digital file. It is much harder, if not impossible, to isolate these effects by purchasing the same recording in multiple formats because there is no visibility to what was done by the mastering engineer.
The filtering damage that Neil Young is concerned about happens in the recording process at 44 Khz. There is no magic that his or any other player can apply to restore the music that was thrown away and/or butchered during the conversion to 44 kHz.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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Follow Ups
- RE: Attribution error? - Tony Lauck 01/29/1510:55:10 01/29/15 (0)
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