Systems and methods for operating cameras are described. An image signal received from an image sensor can be processed as a plurality of video signals representative of the image signal. An encoder may combine baseband and digital video signals in an output signal for transmission over a cable. The video signals may include substantially isochronous baseband and digital video signals. A decoder demodulates an upstream signal to obtain a control signal for controlling the position and orientation of the camera and content of the baseband and digital video signals. Systems and methods are described that receive the various signals, provide synchronization information associated with the signal, correct phase shift offsets in the signals and employ or detect encoding schemes used in signaling. Systems and methods for detecting presence of the signals are described.