Jump to content

mansr

Premium
  • Content Count

    13163
  • Joined

  • Last visited

4 Followers

About mansr

  • Rank
    Troll

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. Noise went way up. I don't know why. Maybe the the freezer droplets are electrically charged or something.
  2. Alex, since you "disagree" with the datasheet, perhaps you could present your own measurements along with a description of the test setup you used to obtain them. There's also a form on the TI website for reporting errors in datasheets.
  3. There's generally not a lot of information in the high half of the spectrum, so compressing it to 8 bits per sample without losing much is a reasonable proposition. With MQA-CD, there is less than half a bit per sample (one bit per left/right pair minus overhead) of compressed data. That's not enough to do much of anything with, so I suspect there's considerable fakery going on. In fact, it's obvious from the decoded files that the top quarter of the spectrum is just a mirror image of the 3rd quarter with a downward slope applied. I haven't figured out what's going on in that 3rd quarter, but I suspect it has only a superficial resemblance to the original.
  4. One might say he embiggened its popularity.
  5. How come? You could change the title to "Preamp Output Voltage" and the discussion would be just as relevant.
  6. It's all rather pointless since we're talking about values around -110 dB (including output stages and ADC) anyway. That won't do. Bad things happened during the actual spraying.
  7. If your power socket type allows it, try flipping the plug around. Sometimes that helps.
  8. That depends on what the meaning of the word is is.
  9. Let's overlay those THD+N graphs from the datasheet and give them some colour: Blue is ±12 V, red ±15 V, and green ±17 V supply. Notice how the three curves overlap almost perfectly up to the 2 V mark. In this region, THD+N decreases linearly with increased output voltage, suggesting that it is dominated by a constant noise level. At some output level, distortion starts rising and overtakes noise as the dominant THD+N contributor. The level at which this happens increases with increasing supply voltage. This tells us that to minimise THD+N, we should use the highest allowed supply voltage (±17 V) and set the gain such that we get the output voltage at the bottom of the corresponding curve. If design requirements call for a lower output voltage, the lowest possible THD+N at that output level can still be obtained with a lower supply voltage. It need only be high enough that the chosen output voltage puts us somewhere on the linear part of the THD+N curve. A higher than necessary supply voltage only wastes power.
  10. Still going by the graphs you posted, for 2 V output, ±12 V supply is enough to reach minimum distortion. A higher supply voltage increases power consumption. This raises the temperature and with it the noise level. Not good.
  11. According to those graphs, for a given output voltage, THD+N stays constant once the supply voltage is sufficiently high (distortion breaks down as the rails are approached). Raising the supply voltage further only causes increased power draw.
  12. The claim is more akin to saying that the Porsche performs worse after you've used the clutch unless you restart the engine.
  13. Right, those graphs show that THD+N is better with an even higher supply voltage and correspondingly higher output voltage.
  14. The patents are probably only vaguely applicable to the actual product. Enough to make a compatible system infringing, but not enough to enable anyone to make one based on them.
×
×
  • Create New...