|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
83.80.178.251
In Reply to: RE: Jitter Article & Listening Tests-With Music Files posted by Jon Risch on August 19, 2013 at 19:34:11
What type of jitter was added, random or signal-correlated, and how much?
And what are those levels that most naysayers tout as being audible?
Klaus
Follow Ups:
It would help tremendously in answering your questions, to simply go to the links I provided.
As for the jitter levels, I think that your question will answer itself once you see the levels he is talking about, and which ARE audible if you listen to his audio files!
If after reading the content of the links, you still have such questions, then I would begin to doubt that I could possibly be able to explain it to you. But I will try, if that is what you need.
Of course, if you read both links, the audio files will no longer be blind, but I guess it depends on whether or not you can invest even a few minutes of your time to check it out and listen first before going to the 2nd link.
If it helps to know ahead of time some of the details, then:
The jitter is a band of noise at center frequencies of 300 Hz, 200 Hz, and a band of noise below 10 Hz.
The amount is 300 pS (200 Hz and 300 Hz)and 800 pS (below 10 Hz band).
The reference file is supposed to have jitter levels around 2-4 pS.
The test set-up is shown at:
http://cranesong.com/JITTER_TEST_SETUP.pdf
Jon Risch
“The jitter is a band of noise at center frequencies of 300 Hz, 200 Hz, and a band of noise below 10 Hz.
The amount is 300 pS (200 Hz and 300 Hz)and 800 pS (below 10 Hz band).
The reference file is supposed to have jitter levels around 2-4 pS.”
Is that random or signal correlated jitter?
What are the lowest jitter levels "most naysayers tout as being audible", what are
the perception thresholds, and what is the research those thresholds come from?
Jitter is jitter. Discussing which type it is is irrelevant and moot. Either type you mention can be heard. Most levels are perceptible, as this example clearly shows. There is no real threshold, it's not a signal, it's a state of condition of the signal. It manifests itself as distortion of the signal.It's effects are also cumulative or additive. So system jitter will be added to the jitter on the recordings, so the relative differences in the recordings will still be perceived.
Where there is a threshold is in the resolution of the system to be able to resolve the details so they can be heard. A cheap budget system will not resolve jitter well (or music), where a more refined system will show its effects more greatly.
Edits: 10/16/13
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: