I also want to talk about J-Test here. I'm not a fan. The reason? It's a signal only, not a jittery source. It was designed to "stimulate" jitter in the source device or the receiving device.
In the other thread, a test was cited where they used a transport to play the J-Test file. If the track stimulates jitter, how do we know how much jitter is created? Every source that plays the J-test track will "stimulate" different levels of actual jitter in that source device. Different amplitudes and different spectra. The jitter source will be different every time.
What we need instead is a jitter STANDARD. A device that outputs a signal with a fixed set of jitter characteristics or maybe even more than one: low frequencies, high-frequencies, correlated, non-correlated etc.. Each of these selectable. With this tool, one could actually determine what jitter rejection a device exhibits.
In the other thread, a test was cited where they used a transport to play the J-Test file. If the track stimulates jitter, how do we know how much jitter is created? Every source that plays the J-test track will "stimulate" different levels of actual jitter in that source device. Different amplitudes and different spectra. The jitter source will be different every time.
What we need instead is a jitter STANDARD. A device that outputs a signal with a fixed set of jitter characteristics or maybe even more than one: low frequencies, high-frequencies, correlated, non-correlated etc.. Each of these selectable. With this tool, one could actually determine what jitter rejection a device exhibits.