Abstract: A system (10) has a pipeline (12) comprised of a multi-channel bi-directional video bus (14), multi-channel bi-directional audio bus (16), and a digital interprocessor communications bus (18). The pipeline (12) is equipped with a number of ports (20) where media controller (microprocessor) printed circuit cards (22) can be connected, thus providing a convenient method for connecting media devices (24) to the pipeline (12). In this manner, a media device's video input and output can be optionally connected to any of the video pipes (26) of the video bus (14). Similarly, the media device (24) audio inputs and outputs can be optionally connected to any of the audio bus (16) pipes (26). The switching is accomplished through a pair of analog multiplexers (28) whose connection options have been commanded by local microprocessor (30) resident on the media device microprocessor control board (22).

Abstract: Apparatus and method for automatic control of with a high pressure mercury arc lamp is described. The apparatus includes a control unit that monitors the current and the voltage supplied to the arc lamp. A temperature measuring device is coupled to a portion of the lamp for monitoring the temperature. The control device controls a flow of air past the lamp by controlling the power to a fan motor or by controlling the flow of air by controllable dampers. After equilibrium conditions are established, the control unit determines and stores the equilibrium values of current and voltage. Thereafter the control unit monitors the values of current and voltage periodically. When these measured voltage and current values are outside of predetermined limits, the control unit initiates shut down operation of the lamp.