Camera trigger logic - DigitalSum#
The simulation of the trigger logic for the digital sum trigger is defined as follows:
An (optional) shaping of the input signal is applied using a shaper signal defined in .
An (optional) time offset in FADC bins, (), used in the convoluted signal of the “discriminator input” signal \(\times\) the (effectively a convolution kernel).
If necessary, the digital signal in each pixel can be clipped either before or after shaping. The clipping thresholds are defined respectively by and ).
The digital trigger logic, defined in the , is then applied and can be either of the following options:
The digital signals in trigger clusters of adjacent pixel patches are summed and the trigger fires if the sum over all pixels in a cluster is higher than a predefined value, . A patch is composed of three adjacent pixels and a trigger cluster consists of three patches, nine pixels in total. One patch can be part of a few trigger clusters, such that the clusters overlap. An example for this case for the definition in the is “DigitalSumTrigger * of 1719[1724,1726] 1716[1717,1718] 1732[1733,1734].”
SmartPixel logic: e.g. a pixel cluster of seven pixel clusters where the central pixel must have fired (would be a line in the like “Trigger * of 561 562 597 +598 599 633 634”, with the smart pixel indicated by the ‘+’).