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Old 05 December 2013, 22:28   #96
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Originally Posted by mc6809e View Post
You can't define a Nyquist limit is this case. That's my point. Approaching the Amiga sound quality question from the perspective of sampling theory doesn't work.
Yes, the point I was trying to make is that you can't apply Nyquist limit to producing sounds like Paula does. I'd think that any sound card will act the same if given samples like you described.

Suppose a 500 Hz sine wave is sampled at 1000 samples per second and stored.

Is the waveform a sample of a sine wave or square wave?

It's obviously a sample of a sine wave but will be output as a square wave and new frequencies will appear in the output that weren't in the originally sampled signal.
You will get the same sine wave if you low-pass filter it, which is what you are supposed to do. You can't just play back samples and expect to get the original signal back, you must filter it.
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