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About opus101

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    Hangzhou, PRC

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  1. D- and D+ are complementary (balanced) signals, meaning there's only a single bit being sent at a time, but with two polarities. This is to allow noise pick-up to be cancelled.
  2. Then there was at least one 'good reason'!
  3. That's your perception which you're entitled to. My own is radically different - its been most enlightening.
  4. I haven't ignored anything ISTM here. But point to the particular thing you're claiming I've ignored, maybe I did miss something. After all, I'm not infallible.
  5. No, you haven't got it. But if that works for you, go with it. Words in everyday usage do often have different meanings to those in more technical discourse. Take one you've already used 'semantics' - that gets used in linguistics quite differently from the way you've used it on this thread. Are linguists wrong to have a technical meaning for it? Or take astronomy, most lay people would count Pluto as a planet. But astronomers apparently beg to differ, it doesn't meet the definition and thus is a 'dwarf planet' to them. But does the dictionary reflect this definition?
  6. That's OK - I don't have expectations of what others will understand. I do my best to explain but understanding - that's up to the reader.
  7. So you say. Yet there is a very real disagreement here between us. You claim that audio isn't about perception, I claim that perception is a very important aspect of audio. Perception is important not just in the perception of waves to form sound, but also in the marketing of products which we use to create those waves in the air. Perception of their value, capabilities most certainly impinges on how the listener perceives the final sound.
  8. That's your perspective, I disagree as explained. Sound reproduction cannot take place in the absence of perception. I think definitions and semantics are very important to get right. 'Semantics' is about meanings and so the meanings are indeed the substance of what's being discussed.
  9. Right Frank, the word I'd use is 'conflating'.
  10. I disagreed with what I quoted : Audio is an activity that aims to reproduce a physical phenomenon — sound, at a different location and time. This part of the activity has nothing to do with the senses and can be studied and measured using existing instruments. How I'd write this would be to say Audio is an activity that aims to reproduce a percept - sound, using physical phenomena - waves in the air. I'd omit saying that the physical phenomena have nothing to do with the senses as that's misleading - rather they are the raw material the senses
  11. Yeah that's what you thought - opinion. But I disagreed.
  12. Wikipedia Frank? Isn't that just another textbook? And not a particularly stable one....
  13. Well bully for the textbooks! I guess those are physics textbooks in the main where they're not interested in perception. But if you were to get some textbooks on perception you might find them making distinctions between what impinges on the ear and what impinges on consciousness.
  14. I disagree here - 'sound' is a percept. What you're talking about is vibrations in the air. They're the physical phenomena that can be measured etc. To get sound, one needs a listener.
  15. If lowest jitter is your aim then yes, provided your DAC supports the async protocol. If freedom from noise conducted over interconnects is what you're after then USB in stock form is worse than S/PDIF as normally the latter is isolated via signal transformer. So - pick your poison.
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