Signal processing method and apparatus

Abstract

A signal processing apparatus includes an input voltage selector configured to select an input voltage from a plurality of input voltages; an input element connected to the input voltage selector; and an input current controller configured to control an inflow of an input current in conjunction with an operation of the input voltage selector.

What is claimed is: 
     
         1 . A signal processing apparatus comprising:
 a light source unit configured to output a light signal to a body of a user;   a light detector configured to detect a first biosignal measured based on the light signal;   a bioelectrode configured to detect a second biosignal measured based on a voltage signal;   a signal processor configured to amplify the first biosignal or the second biosignal based on a measurement mode; and   a controller configured to control the measurement mode of the signal processor.   
     
     
         2 . The apparatus of  claim 1 , wherein the signal processor is further configured to be operable in a current measuring mode and a voltage measuring mode; and
 the controller is further configured to control the signal processor to amplify the first biosignal in the current measuring mode, and control the signal processor to amplify the second biosignal in the voltage measuring mode.   
     
     
         3 . The apparatus of  claim 1 , wherein the first biosignal is a photoplethysmogram (PPG) signal, and the second biosignal is an electrocardiogram (ECG) signal. 
     
     
         4 . The apparatus of  claim 1 , wherein the light source unit comprises a plurality of light sources; and
 the controller is further configured to sequentially activate at least one light source among the light sources during each of a plurality of time intervals, and determine a light source for measuring the first biosignal from the light sources based on a level of a signal output from the light detector during each of the time intervals.   
     
     
         5 . The apparatus of  claim 2 , wherein the controller is further configured to control the signal processor to amplify the first biosignal by controlling a connection between the signal processor and the bioelectrode in the current measuring mode, and control the signal processor to amplify the second biosignal by controlling a connection between the signal processor and the light detector in the voltage measuring mode. 
     
     
         6 . The apparatus of  claim 2 , wherein the controller is further configured to control the signal processor to amplify the first biosignal by controlling a connection between the signal processor and the bioelectrode to prevent the second biosignal from being amplified by the signal processor in the current measuring mode and control the signal processor to amplify the second biosignal by controlling a connection between the signal processor and the light detector to block the first biosignal being input to the signal processor in the voltage measuring mode. 
     
     
         7 . A signal processing method comprising:
 outputting a light signal from a light source unit to a body of a user;   detecting, by a light detector, a first biosignal measured based on the light signal;   detecting, by a a bioelectrode, a second biosignal measured based on a voltage signal;   amplifying, by a signal processor, the first biosignal or the second biosignal based on a measurement mode; and   controlling the measurement mode by a controller.   
     
     
         8 . The method of  claim 7 , wherein
 the measurement mode comprises a current measuring mode and a voltage measuring mode, and   the amplifying comprises amplifying the first biosignal in the current measuring mode, and amplifying the second biosignal in the voltage measuring mode.   
     
     
         9 . The method of  claim 7 , wherein the first biosignal is a photoplethysmogram (PPG) signal, and the second biosignal is an electrocardiogram (ECG) signal. 
     
     
         10 . The method of  claim 7 , wherein the light source unit comprises a plurality of light sources, and
 the controlling further comprises controlling to sequentially activate at least one light source among the light sources during each of a plurality of time intervals, and determining a light source for measuring the first biosignal from the light sources based on a level of a signal output from the light detector during each of the time intervals.   
     
     
         11 . The method of  claim 8 , wherein the controlling further comprises:
 controlling the signal processor to amplify the first biosignal by controlling a connection between the signal processor and the bioelectrode in the current measuring mode; and   controlling the signal processor to amplify the second biosignal by controlling a connection between the signal processor and the light detector in the voltage measuring mode.   
     
     
         12 . The method of  claim 8 , wherein the controlling further comprises:
 controlling the signal processor to amplify the first biosignal by controlling a connection between the signal processor and the bioelectrode to prevent the second biosignal from being amplified by the signal processor in the current measuring mode; and   controlling the signal processor to amplify the second biosignal by controlling a connection between the signal processor and the light detector to block the first biosignal being input to the signal processor in the voltage measuring mode.