Patent ID: 7324915
Filing Date: 2008-01-29
Classification: A61B

Abstract:
1. A method for transmitting control instructions to a sensor in a position tracking system, comprising: generating a drive signal for driving a field generator; superimposing a control signal comprising the control instructions on the drive signal; driving the field generator with the drive signal, so as to generate a field to be sensed by the sensor; at the sensor, detecting the field in order to determine position coordinates of the sensor and to demodulate the control signal so as to extract the control instructions; and controlling a functionality of the sensor based on the extracted control instructions; and wherein the drive signal has a drive frequency, and wherein superimposing the control signal comprises modulating the control instructions on a control sub-carrier having a control frequency, which is different from the drive frequency, so as to enable separation of the control signal from the drive signal.