Signal conditioning with almost no multiplications via filter sharpening

"Filter Sharpening" creates a filter network using the same computationally simple filter [1] or selections from a set of computationally simple filters [2]. Applications include high-quality signal conditioning using fixed-point arithmetic and only a handful of mostly add/subtract arithmetic operations to compute each output sample value. Applied to electrocardiogram baseline wander removal, for example, the highpass filter has 3 dB corner at 0.25 Hz and better than 40 dB attenuation, yet meets stringent EC-13 medical standard performance constraints.