The present invention provides four or more light sources that emit light that is frequency-modulated with four or more different discrete wavelengths, and an output that is reflected and drawn from the object. At least one light detector for detecting light, four or more light sources and at least one light detector, and a discrete wavelength based on output light detected by the at least one light detector A frequency domain (frequency domain) including: a process circuit that calculates a scattering coefficient and an absorption coefficient for each wavelength, and calculates a concentration of a chromophore existing in the object based on the scattering coefficient and the absorption coefficient for each discrete wavelength； A FD-based multi-wavelength biological signal analyzer is disclosed. Here, the process circuit drives at least two or more of the four or more light sources based on the chromophore present in the object.【解決手段】本発明は、４つ以上の互いに異なる離散型波長（ｄｉｓｃｒｅｔｅ ｗａｖｅｌｅｎｇｔｈ）で周波数変調された光を照射する４つ以上の光源（ｌｉｇｈｔ ｓｏｕｒｃｅ）と、対象体から反射して引き込まれる出力光を検出する少なくとも１つの光検出器（ｌｉｇｈｔ ｄｅｔｅｃｔｏｒ）と、４つ以上の光源及び少なくとも１つの光検出器と連結され、少なくとも１つの光検出器で検出された出力光を基に離散型波長毎の散乱係数及び吸収係数を算出し、離散型波長毎の散乱係数及び吸収係数を基に対象体内に存在するクロモフォア（ｃｈｒｏｍｏｐｈｏｒｅ）の濃度を算出するプロセス回路と、を含む周波数ドメイン（ｆｒｅｑｕｅｎｃｙ ｄｏｍａｉｎ、ＦＤ）ベースの多波長生体信号分析装置を開示する。ここで、プロセス回路は、対象体内に存在するクロモフォアを基に、４つ以上の光源のうち少なくとも２つ以上の光源を駆動する。
