Patent ID: 8043226

Claim:
A bio signal measurement apparatus for simultaneously measuring a first bio signal generated by a human body in response to a stimulus signal and a second bio signal naturally generated by the human body, the apparatus comprising: a stimulus signal generating unit which is configured to generate the stimulus signal to be applied to the human body; a sensing unit which is adapted to contact the human body and includes a plurality of electrodes to which the stimulus signal is applied, the plurality of electrodes detecting at least one intermediate signal containing the first and second bio signals from the human body that occur simultaneously, and the sensing unit being configured to share at least one of the plurality of electrodes to apply the stimulus signal to the human body and to detect the at least one intermediate signal including the first bio signal and the second bio signal; a signal acquisition unit which is configured to acquire the detected at least one intermediate signal and to separate the first bio signal and the second bio signal from the at least one intermediate signal detected from the sensing unit; a first temporal separating unit which is configured to operate in response to a control signal and to apply a first stimulus signal in a first interval of each sampling period and a second stimulus signal in a second interval of each sampling period, to the human body via the sensing unit; a second temporal separating unit which is configured to operate in response to the control signal and to provide a first intermediate signal detected by the sensing unit in the first interval and a second intermediate signal detected by the sensing unit in the second interval, to the signal acquisition unit; and wherein the signal acquisition unit comprises: a first acquisition unit which is configured to obtain the first bio signal from a first intermediate signal detected from the sensing unit; and a second acquisition unit which is configured to electrically separate and obtain the second bio signal from a second intermediate signal detected by the sensing unit, wherein the second acquisition unit comprises: a filtering unit which is configured to filter a frequency band in which the second bio signal exists from the second intermediate signal; and an isolating unit which is configured to isolate the stimulus signal contained in the second intermediate signal which is filtered.