Nonlinear filter for detecting electrocardiogram R-waves and other physiological signals

摘要

A nonlinear filter system for detecting electrocardiogram R-waves and other physiological signals is disclosed. The system includes a high Q band-pass filter for detecting spectral energy indicative of the signal of interest, and producing an output responsive thereto; a one-shot trigger circuit connected to the band-pass filter; and a delay circuit connected to the trigger circuit for reducing the Q for a short period in response to output from the trigger circuit.