dB SPL Sound Source (with distance) - Brian K. Shepard

Word Clock
In order to work correctly, all devices in the Digital
Audio chain must have their sampling rate coordinated.
Word Clock is a timing message shared between digital
devices that keeps them synchronized.
Jitter
Errors or deviations in clock timing are called Jitter.
Although Jitter can be caused by a variety of
components, it is often a result of defective digital audio
cables.
MUSC 310 – 02 Digital Audio