Home Propeller Head Plaza

Technical and scientific discussion of amps, cables and other topics.

[ Follow Ups ] Thread: [ Display  All  Email ] [ Propeller Head Plaza ]
[ Alert Moderator ]

Re: Mostly Jitter Related



There are many different kinds of jitter.

Signal correlated, signal related, random, operation or subsystem related, etc.

So?


It is possible that the signal correlated jitter might be continuous enough and steady enough WITH A STEADY SINE WAVE SIGNAL to be seen as an IM type of side band on a spectrum analyzer, but the FM of the orginal recorded tone will create a continuously changing Frequency Modulation of that original tone, and by definition, the actual frequency will be varying at any given moment, the sidebands as they show up on a spectrum analysis represent the end points (maximum frequency swing) of the FM portion of the signal, and thus, are a secondary representation of what is actually occuring: a signal being walked all over the time domain.

So? As I asked in my original post, what other manifestation is there that counts with regard to what we hear?

You say there is a signal being walked all over in the time domain. Great. But it's the spurious frequencies that we hear.


With any other form of jitter, the non-continuous behavior of the jitter will create time distortions that are constantly changing with each data sample clocked out at the DAC. Yes, some of those may appear to have repetitive components that will then show up as IM sideband end points on a SA around a primary original tone, but since they are occuring on a sample by sample basis, and the SA can only look at a large discrete chunk of time for each analysis, the SA display is more misleading than helpful. You can not FFT one sample

So? You can't hear one sample either. Any more than you can hear the increase and decrease of magnitude of say a sinusiod. Instead you hear it as a singular "tone."


The measurement is not the reality, just an attempt to lock one portion of the reality into a convenient and familair frame of reference. Do not let all of that make it seem as if the measurement has become the reality.

Ok, then answer my original question. What other manifestation of jitter has any meaning in terms of what we hear?

se





This post is made possible by the generous support of people like you and our sponsors:
  Sonic Craft  

Follow Ups Full Thread
Follow Ups
You can not post to an archived thread.

[ Top Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2025, Audio Asylum, all rights reserved ]
[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]