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word clock
A word clock or wordclock (sometimes sample clock, which can have a broader meaning) is a clock signal used to synchronise other devices, such as digital audio tape machines and compact disc players, which interconnect via digital audio. S/PDIF, AES/EBU, ADAT, and TDIF are some of the formats that use a word clock. Various audio over Ethernet systems use broadcast packets to distribute the word clock. The device which generates the word clock - usually with multiple output connectors - is the only ''master'' clock source for all the ''slave'' audio devices.
Word clock is so named because it clocks each sample. Samples are represented in data words.
==Comparison to timecode==
Word clock should not be confused with timecode; word clock is used entirely to keep a perfectly timed and constant bitrate to avoid data errors. Timecode is actual data (technically metadata) ''about'' the media being transmitted, and is optional, being sent in a higher layer. Time code can be used as an initial phase reference for jam sync using the word clock as the frequency reference.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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