Jitter is created in D/A or A/D conversion by uneven/jittery conversion clock. Jitter produces added noise and once conversion is completed it becomes permanent. We can prevent D/A conversion jitter few ways before conversion, but in case of A/D conversion clock has to be perfect to avoid jitter artifacts. Analog recordings digitized with jittery A/D clock cannot be fixed and the only remedy is to digitize again, if analog tapes still exist.
jitter
I am pretty sure I understand jitter generated by streamers and/or DACs. My question is, when a digital recording is created, can there already be jitter in the digital data itself from the ADC? If so, can this ever be corrected during playback, either by the streamer or DAC?