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A new and different time-variant pulse processing system has been developed based on a simple CR-RC filter and two analog switches. The new pulse processing technique combines both ballistic deficit immunity and resilience to parallel noise without a significant compromise to the low energy resolution, generally considered a mutually exclusive requirement. The filter is realized by combining two different pulse shaping techniques. One of the techniques creates a low rate of curvature at the pulse peak, which reduces ballistic deficit, while the second technique increases the tolerance to low-frequency noise by modifying the noise history. Several experimental measurements are presented, including tests on a coplanar grid CdZnTe detector. Improvements on both the resolution and line shape are shown for the 662 keV line of [sup.137]Cs. Index Terms--Ballistic deficit, pulse shaping, signal-to-noise optimization, time-variant filters.