PhilNYC;138679 Wrote: > How are jitter measurements taken "post-DAC"? Isn't the signal analog > after the DAC?
Word-clock jitter shows up as symmetrical side bands in the analog noise floor post DAC, JA makes his measurements this way. Take a look at any of the Stereophile reviews from which the list of jitter values was compiled for details of the measurement sheme. Here is a typical example of the explanation (which happens to be from the review of a Lavry DAC, and which suggests that the claims for Lavry's FIFO-based jitter reduction are well founded ...): http://stereophile.com/digitalprocessors/804lavry/index4.html Or take one of these: http://stereophile.com/hirezplayers/406dcs/index4.html http://www.stereophile.com/digitalprocessors/906slim/index3.html Sean's measurements show that the SPDIF signal leaving the SB/Transporter is a good one (in terms of clock quality). However, a system's jitter will depend on what happens to it after that (e.g. on the quality of the connector, cable, receiver circuit etc.), which is where JA's style of measurement comes in ... And which is presumably one part of the reason why all digital systems don't sound the same ... -- reeve_mike ------------------------------------------------------------------------ reeve_mike's Profile: http://forums.slimdevices.com/member.php?userid=995 View this thread: http://forums.slimdevices.com/showthread.php?t=27452 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
