Biological signal amplifier system with noise level reduction

摘要: A biological amplifier system is disclosed for displaying the cardiac conduction activity, particularly His bundle activity on a beat-to-beat basis by non-invasive technique. Plural sets of bipolar leads are connected electrodes to body surface so as obtain same signal each set. The in parallel plural low noise amplifiers which provide simultaneous but separate amplification signal. amplified signals added together summing circuit with effect reduction averaging random components. Noise further enhanced use negative feedback reference electrode and pass filter notch filter.