Patent ID: 6753758
Filing Date: 2004-06-22
Classification: G06K

Abstract:
A device for providing varying bias voltages to a security device, comprising:a receiving unit for receiving replaceable conditional access cards; a card interface for sensing the insertion of conditional access cards in the security device, the card interface responsive to first and second voltage signals output from a conditional access card for outputting an enable logic signal to a logic unit representing one of a bias voltage ON condition and a bias voltage OFF condition, and for identifying a bias voltage of the conditional access card and outputting a request of the bias voltage to a controller; a controller far receiving the request of bias voltage from the card interface and outputting a selection signal of the bias voltage to the logic unit; and a switch for receiving a control signal from the logic unit based on the selection signal from the controller and the enable logic signal from the card interface and providing a switched voltage to the security device.