A secret "known by signal processing experts" or nonsense? Options

[adamdea]

http://www.wickeddigital.com.au/index.php/...eally-necessary
Sets out what is described as a White Paper by Marco Manunta of M2Tech. It contains the following passage (my emphasis)

"But there is something more. It’s known by signal processing experts, and absolutely not popularized amongst music lovers, that converting an analog signal into a discrete-time one (as it happens when converting from analog to digital) destroys the phase information in the two top octaves of the resulting spectrum. In a CD-standard digital recording, all phase information are lost from 5.5kHz up to 22kHz,"

Can any signal processing experts comment on whether this is true or not, and if so why. As a mere layman I am not able to understand why it even might seem be true.

[greynol]

Delay by a half sample: up-convert to a higher samplerate, perform the delay and then down-convert.

Pretty simple!

[Woodinville]

Delay by a half sample: up-convert to a higher samplerate, perform the delay and then down-convert.

Pretty simple!

Even easier, it's a gaussian impulse, it has no energy outside Fs/2 to speak of, so you can shift it analytically.

it's of the form

e^(((t-t0)^2))/c)*sin(2*pi*f*(t-t0))

So you just change t0.

Reason for edit: formula

[Ethan Winer]

Oh, you math guys...

Though I do understand up-sample, delay, down-sample.

--Ethan