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Computer Audio Asylum Music servers and other computer based digital audio technologies. |
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In Reply to: Attribution error? posted by audioengr on January 28, 2015 at 11:07:43:
" ...it is really the 192 digital filter that makes 24/192 sound good, and only a little bit the higher sample-rate?"
This is simply not true. Furthermore, this oversimplifies the problem and misses the essence of how digital audio works. There are two filters involved, one used in recording and one used in playback. These filters will have different effects on the analog output that one hears.The record filter used for 44 kHz sampling has an impossible task to do: it must severely attenuate audio signals above 22 kHz or there will be aliasing distortion which will corrupt the purity of musical tones, it must have a narrow transition band so that it won't remove high frequency content and strip instruments of their natural brilliance and air, and finally it must have a wide transition band so that any ringing is short term and doesn't disrupt perception of imaging and sound stage. These criteria are mutually incompatible at 44.1 kHz. If one uses a recording filter designed for 192 kHz sample rate at 44.1 there will be severe aliasing distortion. This will be easily seen on a spectrum plot of a square wave as spurious tones below the fundamental frequency, and heard as "fuzz" on the sound that changes in character with a slight deviation of square wave frequency. If one listens to a square wave sweep tone with aliasing one can easily hear "birdies" going down in pitch, something that does not happen with proper filtering. Of course, these effects also happen with music.
The playback filter will not be able to undo the effects of the recording filter, the best it can do is not make matters worse. It can also change the type of distortion one gets in some cases, i.e. mild aliasing or mild ringing can be reduced by rolling off highs. Whether this is an improvement or not will depend on the original recording, the playback system and the listener's tastes.
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 01/29/1509:30:06 01/29/15 (2)
- RE: Attribution error? - audioengr 09:57:00 01/29/15 (1)
- RE: Attribution error? - Tony Lauck 10:55:10 01/29/15 (0)
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