MACKIE HDR 24/96 - Manual (Page 92)

HD24/96 Technical Reference 92
Sample Clocks of both units are locked to each other, it doesn’t matter which unit generates
time code. The example below shows a different way of setting up two HDR24/96 units that
is also correct. In this example the machine on the left generates word clock and locks to
time code, and the machine on the right locks to word clock and generates time code.
Word clock can also come from an external source like a word clock generator, a digital
console, A/D converter, or DAW. As long as all devices lock to the same sample clock, it
really doesn’t matter who generates the clock. The example below illustrates this.
Which method you use is completely dependent on your setup.
How can you Sync to Word Clock and Time Code at the Same Time?
This is a good question, and one that often causes confusion. The following example best
illustrates the answer.
In the example above, the slave receives time code but not word clock from the master.
When you press play on the master, the slave precisely locks its transport position to the
master’s position. However, once the slave HDR24/96 locks to time code from the master, it
effectively “ignores” time code from the master and plays back audio at the Sample Rate
generated by its internal Sample Clock. Because the clocks of the two units are not
synchronized, the audio and the time displays between the two units will drift over time. This
example is exactly analogous to the problem of trying to synchronize two wristwatches to
each other.
Clock Master /
Time Code Slave
Clock Slave /
Time Code Master
T i m e C o d e
W o r d C l o c k
Word Clock Generator
Clock Slave /
Time Code Master
Time Code
Clock Slave /
Time Code Slave
M a s t e r H D R 2 4 / 9 6 S l a v e H D R 2 4 / 9 6
T i m e C o d e