Search results for query: *
  1. D. Lundberg

    Testing audiophile claims and myths

    Quote:   http://www.milleraudioresearch.com/avtech/index.html   You need to register, but it's free.
  2. D. Lundberg

    24bit vs 16bit, the myth exploded!

    Quote: Alright, but the kids book analogy is a bit misleading since those books are about drawing straight lines between points and not about summing sinc-pulses (that would be a strange book ) like digital audio. If you want people to understand digital audio you'll need to stop using...
  3. D. Lundberg

    24bit vs 16bit, the myth exploded!

    Quote: Huh? Waveforms are not reconstructed by drawing straight lines between samples. Where did you get that idea?   Quote: It will get quantized (rounded) to the closest value. The errors from quantization will (in a properly dithered system) represent noise at a level determined...
  4. D. Lundberg

    So, why do we have SACDs anyway?

      Quote: But the real problem is that people obsess over formats in the first place. It doesn't really tell you anything about the sound quality of a release. What really matters is what they have done to the signal in terms of processing (compression, limiting, EQ, etc.).  ...
  5. D. Lundberg

    Why do OpAmps sound different?

    Quote:   The crosstalk measurment only tells you how strongly the channels are separated. If the channel separation is poor they will start to "bleed" into each other, and if it gets really poor you'll be listening to mono instead of stereo (or you may get stereo widening). In this case...
  6. D. Lundberg

    Why do OpAmps sound different?

      Quote:   But there is nothing in those graphs that point to (or can explain) any audible differences. The only thing you can tell from them is that the DAC is subpar (regardless of OP-amp) by modern standards.
  7. D. Lundberg

    Analog "versus" Digital recording and playback

      Quote: Complex waveforms don't exist at a specific frequency, they are a continuum. Observe the spectrograph plot of the signal if you really want to understand what's going on. And shouldn't the focus be on the parts of the signal humans actually can hear?
  8. D. Lundberg

    Analog "versus" Digital recording and playback

         Quote:           The errors from rounding will represent white noise (that is: the errors will not be correlated to the signal) in a properly dithered signal, and the amount of noise determines the dynamic range.   * The bit depth determines the amount of quantization...
  9. D. Lundberg

    Analog "versus" Digital recording and playback

      Quote: You don't need an infinite number of bits. The number of bits will just limit the dynamic range (as a result of the "rounding").   Quote: The converters use sinc pulses. Where did you get the idea that you would need to sample at 4x the maximum frequency?   Quote...
  10. D. Lundberg

    Bit depth

    Quote: The theorem is not imperfect in practice, it's real world physics that (in some ways) complicate the implementation of the theorem. The theorem works exactly as predicted.   Quote: The roll-off is not a problem. Modern converters run at MHz speeds and use advanced digital...
  11. D. Lundberg

    Bit depth

    Quote: Not according to the Nyquist theorem. All the information is captured if the sample rate exceeds twice the highest frequency the signal contains.   Quote:   The reason people focus on the dynamic range is that it's what is ultimately defined by the bit depth:   * The...
  12. D. Lundberg

    SACD and HDCD are marketing gimmicks?

    Quote: Yes, but that is a hypothetical situation. I don't believe there are any commercially available recordings with that kind of dynamic range. And even if there were, they would be completetly useless for most consumers.   But, should you need it, you can use noise shaping to...
  13. D. Lundberg

    24bit vs 16bit, the myth exploded!

         Quote: Dither doesn't "mess up" the waveform, in fact it is is used to prevent quantization (rounding to "steps") from messing up the waveform. The basic form of dither is random noise and it is used to make sure there is enough noise in the waveform to randomize the errors from...
  14. D. Lundberg

    24bit vs 16bit, the myth exploded!

         Quote: You can hear through a noise floor, but as the signal goes below it will be masked to some extent. At som point (depending on the signal, type of noise, etc.) it will be completely masked by the noise and you won't be able to hear it. Ideally you want to keep all of the signal...
  15. D. Lundberg

    24bit vs 16bit, the myth exploded!

    Quote: I assume he meant that you'll need to play at a level exceeding 180dB SPL to hear every part of a signal with 144dB of dynamic range in a room with 50dB SPL background noise, and that is accurate.
  16. D. Lundberg

    24bit vs 16bit, the myth exploded!

      Quote:   Audio waveforms have four characteristics: frequency, amplitude, phase (relative to other waveforms) and dynamic range. The dynamic range is the only one that is affected by the bit depth. Increasing the amount of quantization steps means less quantization error. Less...
  17. D. Lundberg

    24bit vs 16bit, the myth exploded!

      Quote: 0dBFS is the highest possible peak for a digital signal, regardless of bit depth. And at the other end you have the noise floor, which works as a (gradual) limit. So a 16 bit signal can be just as loud as a 24 bit signal, the difference is in the dynamic range.   Quote...
  18. D. Lundberg

    24bit vs 16bit, the myth exploded!

    Quote: No, the total dynamic range of the system is ~6dB (0-1441kHz). The dynamic range in the audible range (20Hz-20kHz) is much larger (thanks to noise shaping).   Quote: Rounding to 2 steps means you'll get tons of quantization errors and those errors will represent white noise...
  19. D. Lundberg

    24bit vs 16bit, the myth exploded!

      Quote: You can't use more samples to emulate "missing" bits, and more importantly: there are no "missing" bits to emulate! More samples will just extend the bandwidth and more bits will just lower the noise floor. DSD (which is based on Delta/Sigma) is actually a PCM-format and works...
  20. D. Lundberg

    24bit vs 16bit, the myth exploded!

      Quote:   You'll actually get everything inbetween, it's the noise floor that limits the dynamic range of a properly dithered digital signal. The amount of bits you have represents the amount of error signal you'll get from quantization (rounding to steps), and the error signal will...
  21. D. Lundberg

    Analog "versus" Digital recording and playback

      Quote:   What do you base those claims on? Tape recorders are technically inferior to good digital recording systems in every aspect (THD, IMD, SNR, frequency response, etc.). And once the signal is in the digital domain you can transfer and process it with minimal loss. Transfers...
  22. D. Lundberg

    24bit vs 16bit, the myth exploded!

    Quote: Originally Posted by Justice Strike i've tried to explain that you can have more resolution with 24 bit sound and that therefore you can do much better postprocessing (such as compression). This is just a fact. Yes, and nobody has argued otherwise. 24, 32 or 64 bits are...
  23. D. Lundberg

    Bit depth and sampling frequency explained

    Quote: Originally Posted by b0dhi My point with all this being that although dithering does increase resolution significantly, it isn't without consequence and cost (some of which we may not even be aware of yet) You make it sound like it's some form of voodoo. There are many...
  24. D. Lundberg

    Bit depth and sampling frequency explained

    Quote: Originally Posted by Justice Strike you are confuzing pcm decoding with spline fitting. Yes you are correct you can approximate it with infinite precision... but that's not how a dac works. And to be honest, sound is much like a brownian motion. I don't think I wrote...
  25. D. Lundberg

    24bit vs 16bit, the myth exploded!

    Quote: Originally Posted by Justice Strike nevermind... no use discussing this with you. Sorry you feel that way, I just don't see how anything I wrote could be that upsetting. It's was just basic stuff you could find in any entry-level book on digital audio.
Back
Top