-Word clock is usually at the frequency of the sample-rate - ie at 48KHz, its period is about 20μs. Word Clock is the most common 'sample rate' based clock but other clocks do exist such as Black and Burst, Tri-Level and DARS. Sample rates can also be derived from these clocks as well.
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-Time – or <em>timecode</em> – on the other hand specifies an absolute relationship or position on a timeline e.g. <code>01:02:03:04</code> (expressed as Hours:Mins:Secs:Frames). It is actual data and not a clock-signal per se.
-The granularity of timecode is <strong>Video Frames</strong> and is an order of magnitude lower than, say, Word Clock which is counted in <strong>samples</strong>. A typical frame-rate is 25 fps with a period of 40ms.
-In the case of 48kHz and 25fps, there are 1920 samples per video frame.
+Word clock is usually at the frequency of the sample rate - ie at 48KHz, its period is about 20μs. Word Clock is the most common 'sample rate' based clock but other clocks do exist such as Black and Burst, Tri-Level and DARS. Sample rates can also be derived from these clocks as well.