Patent ID: 9649038
Date: 2017-05-16
CPC Classifications: A61B

Claim:
1. A heart rate measuring system, comprising: an optical transmitting unit configured to output a light signal to a body; a detecting unit configured to detect a reflected light signal from the body in response to the light signal output to the body; an amplifying unit configured to receive the reflected light signal of the body and to generate with the reflected light signal, a multi-stage amplified signal made up of a plurality of different corresponding signals with different gains, the amplifying unit including a multiplexer; and a processor configured to separate the multi-stage amplified signal from the amplifying unit into a plurality of channel signals having gains respectively corresponding to the different gains, to reconfigure the light signal using at least one of the plurality of channel signals, and to calculate the heart rate based on a correlation coefficient which is estimated by using the reconfigured light signal and a basic pattern, wherein the amplifying unit further comprises an amplifier configured to amplify a difference between a signal input to a first input terminal and a signal input to a second input terminal, the first input terminal is connected to one of each of different resistances which corresponds to each of the different gains, in response to a control signal from the processor, and the amplifying unit is configured to generate the multi-stage amplified signal by superimposing the plurality of different corresponding signals with different gains.