blades
100+ Head-Fier
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We were never able to hear an audible difference due to jitter in any hi fi hear we tested. Our conclusion is that the jitter inherent in modern audio products is simply not audible.
What about this article which states that Jitter that is worse than 20 ps is audible?
http://www.madronadigital.com/Library/AudibilityofSmallDistortions.html
What about this article which states that Jitter that is worse than 20 ps is audible?
http://www.madronadigital.com/Library/AudibilityofSmallDistortions.html
What about this article which states that Jitter that is worse than 20 ps is audible?
http://www.madronadigital.com/Library/AudibilityofSmallDistortions.html
More accurately, it references a paper that claims that 20 ps jitter is theoretically audible (by comparison against the absolute threshold of hearing) if all of the following conditions are met:
- the source signal is an extremely loud pure ultrasonic sine wave
- the audio band is perfectly silent (including no ambient noise), other than the side-band resulting from the jitter
- sinusoid jitter is applied at a frequency that is carefully cherry picked such that a side-band is created exactly at the frequency (~3-3.5 kHz) where human hearing is the most sensitive, e.g. a 22 kHz tone is modulated by 18.5-19 kHz jitter
This is quite different both from the spectrum of real music, and from typical jitter in most devices, and also ignores the possibility of masking.
What about this article which states that Jitter that is worse than 20 ps is audible?
http://www.madronadigital.com/Library/AudibilityofSmallDistortions.html
But if you read the entire article, he chickens out anyway, 20 ps suddenly becomes "a few hundred pico seconds", which agrees with pretty much everyone else. Nothing new here.
More accurately, it references a paper that claims that 20 ps jitter is theoretically audible (by comparison against the absolute threshold of hearing) if all of the following conditions are met:
- the source signal is an extremely loud pure 20Khz sine wave
- the audio band is perfectly silent (including no ambient noise), other than the side-band resulting from the jitter - the audible signal is 120db above the noise threshold
- sinusoid jitter is applied at a frequency that is carefully cherry picked such that a side-band is created exactly at the frequency (~3-3.5 kHz) where human hearing is the most sensitive, e.g. a 22 kHz tone is modulated by 18.5-19 kHz jitter
This is quite different both from the spectrum of real music, and from typical jitter in most devices, and also ignores the possibility of masking.
As long ago as 1998 the Dolby labs researchers were unable to find any commercial products with jitter significant enough to be audible. By a wonderful irony the 2 or 3 commercial products that may just conceivably have jitter bad enough to be audible are all vastly expensive such as this...http://www.stereophile.com/content/mcintosh-ms750-music-server-measurements
but even this pos has distortion sidebands almost 90db down
As long ago as 1998 the Dolby labs researchers were unable to find any commercial products with jitter significant enough to be audible. By a wonderful irony the 2 or 3 commercial products that may just conceivably have jitter bad enough to be audible are all vastly expensive such as this...http://www.stereophile.com/content/mcintosh-ms750-music-server-measurements
but even this pos has distortion sidebands almost 90db down
As long ago as 1998 the Dolby labs researchers were unable to find any commercial products with jitter significant enough to be audible. By a wonderful irony the 2 or 3 commercial products that may just conceivably have jitter bad enough to be audible are all vastly expensive such as this...http://www.stereophile.com/content/mcintosh-ms750-music-server-measurements
but even this pos has distortion sidebands almost 90db down