Abstract: A digital gated base line restorer system for an ionizing radiation spectroscopy device includes a gated base line restorer circuit, responsive to pulses passing through the device, for generating a weighted average of previous base line sample points and applying it to the pulses to compensate for base line offset errors; and a control circuit responsive to the pulses passing through the device, to enable the gated base line restorer circuit to generate the weighted average during intervals between the pulses and applying it during the random pulses.

Abstract: An automatic pole-zero adjustment circuit for an ionizing radiation spectroscopy system includes a digital conversion circuit, responsive to random analog pulses passing through the system for converting the random analog pulses to digital pulses; a programmable digital shaping filter including means for applying a pole-zero cancellation adjustment to compensate for under/overshoot at the output of the programmable digital shaping filter; digitally programmable sampling means including means for defining a window for sampling the trailing edge of the digital pulses and means for sampling the digital pulses during that window to determine the presence of undershoot or overshoot; and a digitally programmable control circuit, responsive to the pole-zero sampling means, for driving the programmable digital shaping filter to introduce an under/overshoot correction signal to the digital programmable shaping filter.

Abstract: An automatic pulse top optimization circuit for an ionizing radiation spectroscopy system includes a conversion circuit, responsive to random analog input pulses passing through the system, for converting the random analog pulses to digital pulses; a programmable shaping filter, responsive to the digital pulses, for producing an output of predetermined shape which maximizes the precision and accuracy of the anticipated measurement; pulse shape sampling means including means for defining a window for sampling the top of the pulse and means for sampling the pulses during that window to determine the presence of a deviation from the predetermined shape; and a control circuit, responsive to the pulse shaped sampling means, for programming the programmable shaping filter to compensate for a deviation in the predetermined shape.