Living-body information measurement device

Abstract

Provided is a living-body information measurement device including a first light emitting element and a second light emitting element each that emits different light in wavelength, a light receiving element that receives the light emitted from the first and second light emitting elements and outputs a received light signal corresponding to an amount of the received light, a separation unit that separates the received light signal into a first received light signal and a second received light signal, a filter that removes noise components of the first received light signal and the second received light signal, and a measuring unit that measures plural living-body information using the first received light signal before the noise components are removed by the filter, the first received light signal whose noise components are removed by the filter, and the second received light signal whose noise components are removed by the filter.

What is claimed is: 
     
         1 . A living-body information measurement device comprising:
 a first light emitting element and a second light emitting element each that emits different light in wavelength;   a light receiving element that receives the light emitted from the first light emitting element and the second light emitting element and outputs received light signal corresponding to an amount of the received light;   a separation unit that separates the received light signal into a first received light signal corresponding to the amount of received light emitted from the first light emitting element and a second received light signal corresponding to the amount of received light emitted from the second light emitting element;   a filter that removes noise components of the first received light signal and the second received light signal; and   a measuring unit that measures a plurality of living-body information using the first received light signal before the noise components are removed by the filter, the first received light signal whose noise components are removed by the filter, and the second received light signal whose noise components are removed by the filter.   
     
     
         2 . The living-body information measurement device according to  claim 1 ,
 wherein the measuring unit measures the plurality of living-body information using a frequency spectrum of the first received light signal before the noise components are removed by the filter, and a ratio of a change in the second received light signal whose noise components are removed by the filter to a change in the first received light signal whose noise components are removed by the filter.   
     
     
         3 . The living-body information measurement device according to  claim 1 ,
 wherein the measuring unit measures living-body information including a blood flow or a blood velocity and an oxygen saturation in blood, as the plurality of living-body information, and   wherein the oxygen saturation in blood is measured using a ratio of a change in the second received light signal whose noise components are removed by the filter to a change in the first received light signal whose noise components are removed by the filter.   
     
     
         4 . The living-body information measurement device according to  claim 1 ,
 wherein the measuring unit measures living-body information including a blood flow or a blood velocity and an oxygen saturation in blood, as the plurality of living-body information, and   wherein the blood flow or the blood velocity is measured using a frequency spectrum of the first received light signal.   
     
     
         5 . The living-body information measurement device according to  claim 1 ,
 wherein the filter is a band pass filter.   
     
     
         6 . The living-body information measurement device according to  claim 1 ,
 wherein the filter is a low pass filter.