ADC common noise correction and zero suppression in the PIBETA detector

We describe a simple procedure for reducing ADC common noise in modular detectors that does not require additional hardware. A method using detector noise groups should work well for modular particle detectors such as segmented electromagnetic calorimeters, plastic scintillator hodoscopes, cathode strip wire chambers, segmented active targets, and the like. We demonstrate a ``second pedestal noise correction'' method by comparing representative ADC pedestal spectra for various elements of the PIBETA detector before and after the applied correction.