Quote: (partial) "There has been an industry trend towards sampling rates well beyond the basic requirements: such as 96 kHz and even 192 kHz[7] This is in contrast with laboratory experiments, which have failed to show that ultrasonic frequencies are audible to human observers. "
Comment: Whoa! None of this is done to reproduce ultrasonic frequencies. In fact the analog filters remove them as best they can. It is done so that the analog filters can be lower-order and more phase-correct, and/or to allow them to BETTER remove the ultrasonic frequencies (which exist, whether you like it or not in a stepped eave out of a DAC) more completely. Heck, read the app notes from any major DAC provider like TI/Burr Brown and see the noise after their reconstruction filters. not so good you will find. But with proper up sampling, we move the noise higher making it easier to filter.
It is these partial truths that continue the crazy arguments between engineers trying to make better sound and audiophiles that are being a) confused and b) sold stuff that does not sound as good as it otherwise might.
Rant off.
Comment: Whoa! None of this is done to reproduce ultrasonic frequencies. In fact the analog filters remove them as best they can. It is done so that the analog filters can be lower-order and more phase-correct, and/or to allow them to BETTER remove the ultrasonic frequencies (which exist, whether you like it or not in a stepped eave out of a DAC) more completely. Heck, read the app notes from any major DAC provider like TI/Burr Brown and see the noise after their reconstruction filters. not so good you will find. But with proper up sampling, we move the noise higher making it easier to filter.
It is these partial truths that continue the crazy arguments between engineers trying to make better sound and audiophiles that are being a) confused and b) sold stuff that does not sound as good as it otherwise might.
Rant off.