PROBLEM TO BE SOLVED: To provide a gain control device capable of constantly performing a normal gain control with respect to a biosignal even if a body movement is generated.SOLUTION: This gain control device 1 for controlling a gain when amplifying an output signal from a sensor 2 outputting biosignals caused by the heart beats, respiration and the like of a person by converting them into electric signals, includes an output detection section 10 for detecting an amplitude of the output signal from the sensor 2, a gain determination section 11 for determining the gain according to the detection result of the output detection section 10, a gain control section 12 controlling the gain of the signal output to a biosignal extraction device 3 which extracts vibration components by the body movement, heart beat, respiration and the like according to the gain determined by the gain determination section 11, and the body movement detection section 13 for detecting a body movement whose amplitude is fluctuated beyond a predetermined range compared with a time of complete rest, wherein the gain determination section 11 determines no gain while at least the body movement is detected by the body movement detection section 13.COPYRIGHT: (C)2009,JPO&INPIT【課題】体動が発生しても常に生体信号に対して正常な利得制御を行うことのできる利得制御装置を提供する。【解決手段】人の心拍、呼吸等に起因する生体信号を電気信号に変換して出力するセンサ部2からの出力信号を増幅する際の利得を制御する利得制御装置1であって、センサ部2からの出力信号の振幅を検出する出力検出部10と、出力検出部10の検出結果に応じて利得を決定する利得決定部11と、利得決定部11で決定された利得に従って体動、心拍、呼吸等による振動成分を抽出する生体信号抽出装置3に出力する信号を利得制御する利得制御部12と、安静時と比べて振幅が所定の範囲を超えて変動する体動を検出する体動検出部13とを備え、利得決定部11は、少なくとも体動検出部13において体動が検出されている間には利得の決定を行わない。【選択図】図1
