Device for detecting motions and method for detecting motions

A method for detecting motions, in which existence and inexistence of the motions are determined by comparing signals outputted in a sensor to detect the motions with a predetermined determination range, comprising:

• (A) outputting signals according to motions by detecting the motions;
• (B) calculating change rates of the signals outputted in outputting signals;
• (C) determining a decision range in proportion to the change rate calculated in the calculating change rates;
• (D) determining existence and inexistence of the motions from the signals outputted from the sensor based on the decision range determined in determining the decision range;
• and
• (E) outputting the determined result of the determining existence and inexistence of the motions from the signals.

A method for detecting motions in which existence and inexistence of the motions are determined by comparing signals outputted in a sensor to detect the motions with a predetermined determination range, comprising:

• (A) outputting signals according to motions by detecting the motions;
• (B) calculating change rates of the signals outputted in outputting signals;
• (C) determining a decision range ranging from an upper value obtained by adding a tolerance range with reference to a threshold value to a lower value obtained by subtracting the tolerance range with reference to the threshold value in proportion to the change rate calculated in the calculating change rates;
• (D) determining existence and inexistence of the motions from the signals, wherein, if the signal outputted in outputting signals is higher than the upper value determined in determining the decision range, it is determined that the motion exists, whereas, if the signal outputted in outputting signals is lower than the lower value determined in determining the decision range, it is determined that the motion does not exist;
• and
• (E) outputting the determined result of the determining existence and inexistence of the motions from the signals.