ECG sensing apparatus and method for removal of baseline drift

摘要

An ECG sensing apparatus and a method for removing a baseline drift in the clothing are provided. The ECG sensing apparatus filters ECG signals and filters a baseline drift noise which is caused by human body's motion and breathing. Accordingly, the baseline drift in the sensing apparatus is minimized even if there is a free motion.

主权项

1. An ElectroCardioGram (ECG) sensing apparatus comprising:
an ECG sensor configured to
measure ECG by using an electrode adapted to be located on a human body, andgenerate an ECG signal based on the measured ECG; a pre-processor configured to perform filtering and amplification with respect to the ECG signal which is generated by the ECG sensor; an analog-digital converter (ADC) configured to convert the ECG signal which is output from the pre-processor, from an analogue format into a digital format; a filter configured to
filter the ECG signal converted by the ADC, andfilter a baseline drift noise which is caused by motion and breathing of the human body; and a communication module configured to wirelessly transmit the ECG signal which is filtered by the filter, wherein the filter comprises:
an inputter configured to receive the ECG signal which is converted into the digital signal by the ADC;an adaptive linear prediction filter configured to remove the baseline drift noise which exists in the ECG signal input to the inputter;a buffer configured to temporarily store the filtered ECG signal which is output from the adaptive linear prediction filter; andan outputter configured to transmit the ECG signal temporarily stored in the buffer to the communication module, and wherein the adaptive linear prediction filter comprises:
a sub delayer which comprises a plurality of delayers configured to shift the ECG signal input to the inputter in sequence;a main delayer which comprises a plurality of delayers configured to shift the shifted ECG signals output from the sub delayers in sequence;a gain unit configured to multiply the ECG signals temporarily stored in the delayers of the main delayer by corresponding coefficients, and output the multiplied ECG signals; andan adder configured to add up all of the outputs of the gain unit and generate the filtered ECG signal.