Originally Posted by CharlesJ
Or, the levels above about 50 kH is below -120dB and will not show? But in either case, I really doubt that those ultrasonics are really musical contents.
Well, the software developer of Spek has spoken and I am devastated to report that I had managed to make a fool of myself once again. True, I had "no idea WTF I was taking about". Thank you, ArnyK, AndyC, and Mcnarus for pointing that out.
A good description is on the [wikipedia page], a spectrogram can
indeed be thought as a series of frequency responses over time. The
vertical axis is the signal frequency and the color intensity
corresponds to the [dBFS] level of the signal at the given
frequency and time. The sampling rate is constant and the max
frequency is always half of it because of the [sampling theorem].
Hope this clarifies things, let me know if it doesn't.
So, CharlesJ, sorry for the error. it was not my intention to deceive you. The only reason I can give you is that I ran a search for software to analyze sampling, which brought me to Spek. So, I assumed it was sampling I saw and they both marked as Hz. Later I noticed that the graph topped at 96kHz and therefore was a frequency (1/2 of sampling rate of 192kHz), but I still wasn't convinced.
Then ArnyK, AndyC, and Mcnarus tried to set me straight, but I refused to listen until I corresponded with the software maker.
Glad the truth came forth and everybody had their fun (me including).
Now let me figure out how to make a 192kHz 24bit vs CD vs MP3 blind test work. So far I just burned them to a BluRay in 48k 24 bit and listened. There is an audible difference, of course, between the MP3 and Studio Master. But the difference between CD and SM is so subtle that I doubt it will be noticeable in a blind test. Ethan is probably right.
So far some components I can configure to run in 192K, some I cant. Let me talk to some experts and see what can be done. Testing in 48k is unfair.
Thanks again.Edited by grigorianvlad - 10/22/13 at 5:00pm