Abstract: A power supply circuit includes a first power supply, which is electrically coupled to a first power supply terminal and a first ground terminal, and a short-circuit line. The first power supply is adapted to supply the first power supply terminal with a DC voltage having a higher electric potential than the first ground terminal. The short-circuit line is adapted to short-circuit a first data terminal and a second data terminal. The power supply circuit further includes a second power supply electrically coupled to the first ground terminal and the short-circuit line. The second power supply is adapted to supply the first data terminal and the second data terminal with a negative voltage having a lower electric potential than the first ground terminal.

Abstract: A power supply circuit includes a first power supply, which is electrically coupled to a first power supply terminal and a first ground terminal, and a shortcircuit line. The first power supply is adapted to supply the first power supply terminal with a DC voltage having a higher electric potential than the first ground terminal. The shortcircuit line is adapted to short-circuit a first data terminal and a second data terminal. The power supply circuit further includes a second power supply electrically coupled to the first ground terminal and the shortcircuit line. The second power supply is adapted to supply the first data terminal and the second data terminal with a negative voltage having a lower electric potential than the first ground terminal.

Abstract: At least one wrong template for storing features of pattern information imaged on condition unsuitable for biometric authentication is provided and the wrong template information is collated with collation template information produced by extracting features from biometric information when authentication information is registered. When similarity is low, the collation template information is stored in an authentication template. The collation template is collated with the wrong template upon authentication and when similarity is high, authentication processing is not made. Further, when similarity of the collation template information and the wrong template information is high, a guidance message for solving a problem is displayed to the user. Thus, reduction of authentication performance is prevented.

Abstract: At least one wrong template for storing features of pattern information imaged on condition unsuitable for biometric authentication is provided and the wrong template information is collated with collation template information produced by extracting features from biometric information when authentication information is registered. When similarity is low, the collation template information is stored in an authentication template. The collation template is collated with the wrong template upon authentication and when similarity is high, authentication processing is not made. Further, when similarity of the collation template information and the wrong template information is high, a guidance message for solving a problem is displayed to the user. Thus, reduction of authentication performance is prevented.