Abstract: In a live audio presentation system, a stage rack and a front of house rack are interconnected by a transmission medium that transmits digital audio data and control information between them. Packets of digital audio data and control information are sent at the audio sampling rate. The packets of data are encoded using an encoding technique that provides unique codes that may be detected, thus enabling clock recovery of a clock signal embedded in the data packets. Data packets may include data for error checking. A serial digital transmission medium may be used as the transmission medium. Such a transmission medium uses low voltage signals and supports high bit rates. The system is synchronized by the FOH rack which transmits data to the stage rack according to a local audio sample clock or an external audio sample clock to which it synchronizes. This clock is embedded in data packets sent to the stage rack.

Abstract: In a live audio presentation system, a stage rack and a front of house rack are interconnected by a transmission medium that transmits digital audio data and control information between them. Packets of digital audio data and control information are sent at the audio sampling rate. The packets of data are encoded using an encoding technique that provides unique codes that may be detected, thus enabling clock recovery of a clock signal embedded in the data packets. Data packets may include data for error checking. A serial digital transmission medium may be used as the transmission medium. Such a transmission medium uses low voltage signals and supports high bit rates. The system is synchronized by the FOH rack which transmits data to the stage rack according to a local audio sample clock or an external audio sample clock to which it synchronizes. This clock is embedded in data packets sent to the stage rack.

Abstract: An apparatus and method for transferring data among clients of a time division multiplexed network is provided. In one aspect of the preset invention the apparatus includes clock circuits that allow for a variable number of time slots and a variable bus cycle of the network. In another aspect of the present invention a network interface module includes an indirection register that contains relationships between memory storage locations and channels of a time domain multiplexed network. In yet another aspect of the present invention, a network interface module is provided that comprises a memory, and first and second registers. In one mode of operation of the network interface module, data from the memory for a client is pre-fetched from the memory, prior to the start of a bus cycle and is stored in the registers to minimize memory access delays in the system.

Abstract: A wafer handler featuring a carriage movable along a rail path, the carriage supporting an upright rotatable arm with a cantilevered wafer chuck. Elevators for raising and lowering trays containing wafer stacks are disposed on either side of the rail path. Each elevator has a curved track section which may be interposed along the rail path. The upright arm has a track follower, parallel to a boom supporting the wafer chuck and freely movable along the rail path, except when it encounters a curved track section. In this instance, the track follower will follow the curved track section, causing rotation of the arm, boom and wafer chuck, bringing the chuck into the wafer stack at an elevation determined by the elevator. In this manner, motion in the X, Y and Z planes may be provided for stacked wafers over extended distances.

Abstract: A wafer orienting apparatus having inwardly biased rollers, spaced about the circumferential edge of a wafer in contact with the edge. Two of the rollers are spaced apart a distance less than the dimension of a primary flat registration edge and are mounted to follow the wafer edge upon rotation of the wafer. When a flat registration edge passes these closely spaced rollers they move inwardly, activating switches associated with a coincidence circuit. When both switches are simultaneously activated, the coincidence circuit produces a signal which stops wafer rotation, thereby orienting the wafer. The rollers are mounted so that they can be moved from the path of wafer travel after wafer orientation, permitting a queue of wafers to be oriented, one after the other.