Patent ID: 8239012
Filing Date: 2012-08-07
Classification: A61B

Abstract:
1. A microcontrolled electrocardiographic monitoring circuit with differential voltage encoding, comprising: an input signal path comprising an electrode, a low pass filter, and an amplifier, each connected in-line, the electrode configured to sense an input signal via a conductive surface and the amplifier configured to output a filtered amplified output signal; a microcontroller circuit comprising an input codec, comprising: persistent memory connected to the microcontroller circuit via a peripheral serial interface bus, wherein the differential voltages for each of the discrete digital values in the data stream are stored into the persistent memory; an output signal path comprising an electrode and a buffer, each connected in-line, and a pair of drive resistors connected in parallel to an input terminal of the buffer and to the output terminals of the feedback generator, the microcontroller circuit configured to adjust each drive resistor according to the digital feedback signal, and the electrode configured to provide an output signal via a conductive surface.