It's OK except some parts I don't agree with. For example a 5 KHz sine wave created at 44.1 Khz (which still sounds perfect and pure mind you) does not sound the same as a 20KHz wave created at 44.1 Khz and then divided down by a factor of 4. After all it is not how one would digitise a 5 KHz wave would they? So that to me is sort of irrelevant
You should read this too:
http://mixonline.com/recording/mixing/audio_emperors_new_sampling/ Except I have taken this further and used a serious quality turntable with pickup and arm feeding expensive RIAA equaliser and using the finest vinyl available (Sheffield Lab albums where the band was mixed and connected direct to the cutting lathe leaving out all stages in between, these records have to be heard to be believed!)
http://www.sheffieldlab.c./historyofsheffield.html I have also done this with analog reel to reel masters which I have (recorded mixed and mastered) and also have the machines to play them back.
So I fed this analog signal to one side of an A/B switch. I also fed this analog signal through an A to D and D to A converter operating at 44.1K 16 bit and this to the other side of the A/B switch.
Now through some very nice speakers in near ideal conditions and a room full of Hi Fi experts and recording engineers. Could anyone tell the difference. Very few not very often either, so NO!. People were dumb founded when I did this experiment. Go figure! Does that tell you anything.