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In Reply to: RE: a measurable euphonious tune in a DAC? posted by dave789 on December 10, 2014 at 14:10:52
Due to the digital filtering essentially removing distortion components above 22 kHz (for CD playback), a "high distortion" player could in essence "restore" some of those harmonics (distortion or otherwise) that were removed in the digitization process. And if done in an artful way, it can sound more "analog" than a typical DAC with infinitesimal distortion.
Follow Ups:
What they "restore" may or may not correspond to the missing harmonics. Different instruments have different amounts of high frequency distortion but after the ADC filters out this information there will be nothing left for the DAC to work with. For example, what is a DAC supposed to do with an 8 kHz sine wave? Was the musical instrument really like a sine wave, or was it more like an 8 Khz square wave? The audio file will be identical for both of these sounds, so if the DAC "improves" the square wave by adding in the clipping, it was harm the sine wave.
If people value "analog" like distortion, then perhaps they need to go unamplified live acoustic concerts. This sets the standard for good sound and it does not sound "analog" or "digitial". It sounds like music.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Fortunately, there are no 8-kHz fundamental frequencies in music so your example is irrelevant. Fundamental frequencies in music rarely go higher than 4-kHz. Consequently, even Redbook CD can reproduce the 2nd, 3rd and 4th harmonics of a 4-khz fundamental.
Best regards,
John Elison
It is necessary to use simplified examples to help people learn. It is not possible to teach calculus to first graders who are learning to count.
Music is what the composers and performers call music. If someone likes to play around with audio oscillators or computers to compose electronic music, who are you to say that it's not music? Does your record library include any electronic music? Mine does.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
The sound of "some" music instruments can be described as fundamental tone and integer multiple overtones.Only "some,", not all.
Anyway, even for music with only instruments with fundamental tone + integer multiple overtones,
Tony Lauck's argument about restoring frequency components above 22kHz holds.
The play back system does not know how much above-22kHz creation is correct.
The psychoacoustic effect of above-20kHz frequencies is not yet proven, as far as I know. Some published test result turned out to be the effect of IMD component below 20kHz.
Edits: 12/14/14
In this product (Styleaudio Sapphire Limited), the harmonics above 22kHz are not likely to be created. The large amount of 2nd and 3rd harmonics appear at low frequencies only.Anyway, the manufacturer should be able to tell whether this large amount of harmonic distortion, which is likely to be accompanied with large amount of intermodulation distortion (IMD), is within their specification after they did "tuning" for subjective sound quality in their design stage.
Edits: 12/13/14
Pierre Verany CD tracks for harmonic distortion measurement
0dB sinusoidal signals
Apple mac mini
optical cable
Style audio Sapphire Limited
analogue output
9.2kOhm passive volume control
signal level attenuated to approximately 4dB below the clipping level of the A/D
A/D
Behringer UCA202
20kHz pic
15kHz pic
10kHz pic
5kHz pic
1kHz pic
500 Hz pic
200Hz pic
100Hz pic
50Hz pic
20Hz
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