The invention relates to a control system to which a state vector representing the states of a controlled system is applied. It is verified that a first application installed in a computing device has permission to communicate with a second application also installed in the computing device based at least in part on a secure key associated with the first application. Thereafter a normalized cross-correlation within an inter-channel intensity difference processor is employed before deriving estimate of panning gains for the left and right audio channels from the IID processor. Upsampling may then be performed on the individual color planes. In some aspects, a mobile device accesses a secret key in response to receiving the challenge value from the wireless network operator. The status signal is an input to the voltage divider circuit that minimizes the voltage divider circuit\u2014s current consumption when the second power supply is ON, while maintaining the status signal value.