under pixel amplifier a synchronous demodulator and a spatial filter node each sensor row uses a multiplex to combine the output of all elements into a single signal when a finger is placed on the sensor matrix a very small signal is coupled from the drive ring to the sub dermal layer of the skin see fig4 for sensor matrix and drive ring this signal follows the ridges and the valleys of the true fingerprint image a fingerprint image is scanned by digitizing the outputs from one sensor row at a time in an image power is applied to the selected row enabling the row to drive an analog channel bus the sample and hold outputs are digitized and sent serially via the host interface to the true print imaging processing algorithm other means for authenticating permitting access such as picture voice image dna etc can be used in lieu of the fingerprint sensor and are considered within the scope of the invention additionally various types of sensors including fingerprint sensors can be used and are also considered within the scope of the invention block 2 illustrates the pc controller for the system in one embodiment the controller can be a single board computer and or an embedded system though such is not limiting.