Biological signal measuring system and biological signal measuring apparatus

A biological signal measuring apparatus comprising:

• a signal receiving section which is configured to receive N kinds of signals corresponding to light intensities of light beams that have been passed through or reflected from a living tissue of a subject and that have N kinds of wavelengths, where N is an integer of four or more;
• a first calculating section which is configured to acquire N kinds of light attenuations based on the N kinds of signals;
• a second calculating section which is configured to acquire (N−1) kinds of blood-derived light attenuations based on two light attenuations related to (N−1) kinds of combinations selected from the N kinds of light attenuations;
• a third calculating section which is configured to identify concentrations of (N−1) kinds of in-blood substances based on the (N−1) kinds of blood-derived light attenuations;
• and
• an outputting section which is configured to output the identified concentrations.

A method of controlling a biological signal measuring apparatus comprising a signal receiving section which is configured to receive N kinds of signals corresponding to light intensities of light beams that have been passed through or reflected from a living tissue of a subject and that have N kinds of wavelengths, where N is an integer of four or more, the method comprising:

• acquiring N kinds of light attenuations based on the N kinds of signals;
• acquiring (N−1) kinds of blood-derived light attenuations based on two light attenuations related to (N−1) kinds of combinations selected from the N kinds of light attenuations;
• identifying concentrations of (N−1) kinds of in-blood substances based on the (N−1) kinds of blood-derived light attenuations, and
• outputting the identified concentrations.