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I doesn't look like you understand what sampling is, and how reconstruction filters in DACs work. Your statement is true for some waveforms, depending on their

I doesn't look like you understand what sampling is, and how reconstruction filters in DACs work. Your statement is true for some waveforms, depending on their frequency, due to the use of reconstruction filters on the output, but it's not true for any signal and the problem becomes more apparent the higher the frequency of the waveform.

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krackers 3y ago
If I'm understanding you correctly, you're saying that while a perfect sinc interpolation reconstruction would allow you to capture up to 44.1/2 kHz, in practice since we're limited to FIR reconstruction filters we can't actually get that high? If so it seems like a fair point, although I'd imagine they'd be better than 6khz? There's also the issue of the input signal not being band-limited which is necessarily true for real world signals given that you sample for a finite duration.
- rplst8 3y ago
  Input signals are ALWAYS band limited for digital systems. If you don't do this and you work for any company designing such circuitry, you'd be fired.
  - krackers 3y ago
    There's no such thing as a finite support band-limited signal.
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baobrien 3y ago
Reconstruction filters in DACs are analog low-pass filters. They don't do a linear interpolation between samples.
steve1977 3y ago
You explicitly said a 6 kHz sine wave. Which is pretty much the textbook example of a waveform and frequency which would work perfectly. Maybe you wanted to say square wave?