+1 cleeds! Too many still believe that more expensive DACs do a better job of "smoothing out" the steps between digital samples. Nonsense! My $99 DAC outputs rival those of any four-figure DAC (low noise, low distortion, accurate LSB ...).
how is digital sound created?
So sound is a vibration which is created from things rubbing or banging together etc. If stuff isn't interacting with something to create a sound how are sounds created from nothing? I.e in the digital world? Music on an iPod or a beep from a computer? I have always wondered what the noise's are and that come from computers when they are 'thinking' or working - wtf's going on there?
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You are mistaken. Interpolation is "guessing" by definition (in this context) and interpolation is part of the CD standard.@yage was talking about 'error correction' and indeed that is done without guessing. There is a stage beyond error correction where the data's too corrupted to do error correction and that's normally termed 'error concealment'. Its at that point where interpolation - which indeed is a kind of guessing in this context - is used. Muting is the final stage where the data's too far gone even for interpolation/concealment. |
@abraxalito Thanks for that clarification - good to know. It's a linear interpolation, so very different from the interpolating filters used in the DACs themselves. The reference I found is at this link - https://www.pearl-hifi.com/06_Lit_Archive/02_PEARL_Arch/Vol_16/Sec_53/Philips_Tech_Review/PTechRevie... Of course, all this only applies to compact disc digital audio. In case anyone is interested, I found an overview of the error correction approaches in other disc formats - https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.462.3524&rep=rep1&type=pdf |
abraxalito There is a stage beyond error correction where the data’s too corrupted to do error correction and that’s normally termed ’error concealment’. Its at that point where interpolation - which indeed is a kind of guessing in this context - is used.It’s all part of error correction, all part of the Reed-Solomon code, and I actually quoted the exact math that applies. Then there are those who insist that there is no interpolation, or those who insist digital audio results in stairstep signals. That’s why I usually post links to the facts - there is just so much misinformation about digital because it’s not intuitive. But as I noted, interpolation in digital audio is actually quite rare. That’s how well the error correction schemes work. |
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