It can occur that you want to modify the start and/or end times of all annotations of one or more tiers with the same amount of milliseconds. If e.g. the start of annotations is such that playing the interval of an annotation often misses the very first part of the audio of the utterance, it is best to move the start time of each annotation a bit to the left. Such annotations could e.g. have been created by a recognizer which made the boundaries of segments a bit too "tight".
This function can be started via Tier>Modify Boundaries of All Annotations... and involves two steps.
If an annotation document is open, the single file option Use currently opened file is active. In the multiple file situation (see Modify boundaries of all annotationsSelect files from browser and Select files from domain are active. When tiers are loaded in the table, select one or more tiers to process and click Next.
There are two main options in this step:
-200
, moves the boundary to the left, a positive value
to the right. If the entered values are not the same, the duration of the
annotations will change as well as a result of the modification. (If the values
are the same, it might be better to use the Shift
Annotations option, in the single file case).Annotations are processed from left-to-right and, depending on the selected options, the processing of one annotation may alter the next annotation before it is processed itself. For predictable results, in some cases it is best to perform the modifications in two rounds, once for the begin times, once for the end times.
Click Finish to apply the modifications.