> Can the converter itself not create the signal incorrectly?
Certainly the converter can be bad or malfunctioning... but there is only one bandlimited signal that passes through the sampling points.
The ideal behavior is perfect and described by simple (if surprising) math and we can measure any converter against the ideal. It turns out that _very_ good converters— ones with variation from the ideal are at the level of the thermal noise in the electronics— are commonly and cheaply available.
There was another chapter of the video that got dropped due to length, the desire to get something shipped, and because the tone didn't quite fit with the rest which compared the performance of a couple of consumer grade DAC/ADCs and basically showed they were all very good. Hopefully it should make its way out as 'bonus material' sometime soon.
Certainly the converter can be bad or malfunctioning... but there is only one bandlimited signal that passes through the sampling points.
The ideal behavior is perfect and described by simple (if surprising) math and we can measure any converter against the ideal. It turns out that _very_ good converters— ones with variation from the ideal are at the level of the thermal noise in the electronics— are commonly and cheaply available.
There was another chapter of the video that got dropped due to length, the desire to get something shipped, and because the tone didn't quite fit with the rest which compared the performance of a couple of consumer grade DAC/ADCs and basically showed they were all very good. Hopefully it should make its way out as 'bonus material' sometime soon.