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How Latency is Applied to Raw Files
Posted by Caryn Zacharias, Last modified by
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on 10 February 2015 04:00 PM

How Latency is Applied:

1.  Acquisition:  During collection if a latency value is entered in Hardware that value is written in the header and the time stamps in the raw file are adjusted based on the latency value.  

2.  Processing:  

     2a. If a latency value is already entered in Hardware, that value will be populated in read parameters of the processing program.  The program knows the latency values are the same and will not reapply a latency to the data.  

     2b. If a latency value needs to be changed after collecting the data, the final latency value needs to be entered in the read parameters of the processing program.  The program knows the orignal latency value and will calculate the difference of the two and make the correction.  

example 1:  If a latency value of 0.5 seconds is entered in Hardware and the actual latency value should be 0.7 seconds.  You need to enter a latecny value of 0.7 seconds in the read parameters and the program will make the correction and apply the new value to the data.  (Do not enter a 0.2)

example 2:  If any latency value is entered in Hardware and it is found that no latency values should be applied.  You need to enter a 0 for latency in the read parameters and the processing program will make the correction and remove the latency from the data.