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  1. 22906

    Hi-fi audio signal chain -- no more sigma-delta

    You're right. Let me rephrase: a theory that has not yet been disproven.
  2. 22906

    Phase in Audio Signals

    I hope those are not illogical personal attacks
  3. 22906

    Phase in Audio Signals

    Thank you to all readers; I would like to expand on points #2 and #3 for the benefit of the community. The reason I am against digital filters is that I believe once the signal has been sampled, and therefore transformed to discrete time, further manipulations can only hurt signal integrity and...
  4. 22906

    Hi-fi audio signal chain -- no more sigma-delta

    Maybe we can read it together, father.
  5. 22906

    Hi-fi audio signal chain -- no more sigma-delta

    Thank you; however, that's not what I'm doing. My technique is simply to propose a theory that can't be disproven. That is the definition of scientific truth.
  6. 22906

    Hi-fi audio signal chain -- no more sigma-delta

    jcx: While I can't say I appreciate the cynicism and utter lack of evidence in your post, I do appreciate your attempt to discredit my ideas. Hi-fi audio does require static linearity, and "perceptible distortion" is not a valid criterion for judging the fidelity of an audio signal.   -...
  7. 22906

    Hi-fi audio signal chain -- no more sigma-delta

    ubecko,   I applaud your attempt to understand what's going on; keep up the good work. Your new friend at Head-fi, m3_arun
  8. 22906

    Hi-fi audio signal chain -- no more sigma-delta

      I hold a BSEE from UCLA. You can make fun of my degree all you want.   Your claims about hearing processes are not relevant to creating a hi-fi signal chain. Whether we can hear non-linearities in the system is irrelevant to the fact that they are there; if digital audio was based on the...
  9. 22906

    Phase in Audio Signals

    No, actually, you can't.
  10. 22906

    Phase in Audio Signals

    Hello Head-fi; I'm back. This time to advance my views on phase linearity in the audio signal chain.   1. Only planar transducers (or phase-linear transducers) should be used in audio 2. Digital filters are completely unnecessary and counterproductive to hi-fi reproduction 3. The maximum...
  11. 22906

    Hi-fi audio signal chain -- no more sigma-delta

    I want to pre-empt some of the responses that have yet to be posted; and this will NOT be my last post on the topic.   Delta-sigma manufacturers have used various statistical linearity measurements to cover up the lack of resolution of the converters. There is no substitute for static...
  12. 22906

    Hi-fi audio signal chain -- no more sigma-delta

    Jokes aside, after doing some more independent research, I've realized that the parameter I am looking for is called "static linearity." I predict that the static linearity test will show the R2R coming out on top. Thanks to all for playing along for so long.
  13. 22906

    Hi-fi audio signal chain -- no more sigma-delta

    Haha guys... actually it's all a joke... I'm just preparing everyone for the launch of my new laser-trimmed R2R DAC chip, the RTO4665, which I designed on my own computer with CAD drawings, and which is manufactured on .18um equipment in Taiwan. PM me for pre-order details. Introductory pricing...
  14. 22906

    Hi-fi audio signal chain -- no more sigma-delta

    Yes I think probably the only kind of barely justifiable filter in the chain would be a low-pass before the ADC. That's if the mic response goes past .5 Fs. And yeah, higher sampling frequency would be great.
  15. 22906

    Hi-fi audio signal chain -- no more sigma-delta

    Science is about argumentation. Theories are facts are all logical constructs. It's the only way to reach a consensus on the matter that actually corresponds to reality. If you ignore the rules of logic and argumentation, you get hodge-podge results like delta-sigma ____. I'll let it slide that...
  16. 22906

    Hi-fi audio signal chain -- no more sigma-delta

    I bet that felt good.
  17. 22906

    Hi-fi audio signal chain -- no more sigma-delta

    So I should back down because some guy with a degree is emotional about a flawed paper? You want to run around with delta-sigma DACs claiming they have 32-bit time-domain resolution? Now I see that is why the DIY community exists; money blinds us to reality. Ponder my definition of resolution...
  18. 22906

    Hi-fi audio signal chain -- no more sigma-delta

    Thank you for the kind words. I will be honest; for me, this is a exercise in logic and argumentation. I know I am right only because no one can conclusively prove me wrong. Would you go back on your word for any other reason? It is my belief that for a man to mean what he says, and say what he...
  19. 22906

    Hi-fi audio signal chain -- no more sigma-delta

    As you can see in Figure 3 B, the error in the paper and the error in the hi-fi industry today, is that people are mistaking resolution on the time axis for resolution on the amplitude axis. I agree than sigma-delta has amazing frequency-domain characteristics. But it cannot add real amplitude...
  20. 22906

    Hi-fi audio signal chain -- no more sigma-delta

    I think it is established; at any given sampling point, the PCM encoded sample can describe 2^N discrete amplitude levels (N being the number of bits of resolution). The discrete amplitudes encodable by the PDM signal is dependent on the frequency of pulse generation. To match the resolution of...
  21. 22906

    Hi-fi audio signal chain -- no more sigma-delta

    Neither of your claims are true. We already established that the PDM bitstream used in SD converters literally cannot support the same resolution that a PCM signal and R2R conversion can. Zero order hold causes roll-off of frequencies near the cutoff; whether it adds additional ultrasonics...
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