Abstract: The invention relates to a display system using a remote control transmitter handunit having both a "pointing function" capability for moving a cursor displayed on a display screen by changing the angular position of the remote control handunit, and the capability of sending dedicated function data directly to the receiver. Thus, numeric data representing, for example, channel number or time of day, being unsuitable for selection from a menu is directly transmitted along with "pointing function" data transmission.

Abstract: The invention relates to a display system using a remote control handunit having "pointing function" capability for moving a cursor displayed on a display screen by changing the angular position of the remote control handunit. Specifically, the individual transmitting transducers of the remote control handunit are driven with signals having a predetermined phase relationship relative to each other such that the resultant phase received by the receiver is indicative of transmitter angular position.

Abstract: A video disc record system having a stylus for recovering information effects kicks which induce limited stylus translations across a disc record surface. Control circuitry responsive to a desired stylus translation are coupled to kicker means for inducing the stylus translation. Actual stylus translations are used to calibrate the kicker activation signals to minimize the kick used to induce stylus translations thereby reducing damage to the disc surface incurred during a stylus translation.

Abstract: A system for detecting and correcting a stuck condition on the bus lines of a parallel multi-channel data transmission system. The system comprises a transmitter for generating N data signal having first and second logic levels, a receiver for receiving said N signals, and a plurality of N data channels connecting said transmitter with said receiver. Each data channel comprises first and second Exclusive OR (XOR) gate means each having first and second input means and an output means. A data input signal is supplied to the first input means of said first XOR gate and the output of the second XOR gate is supplied to said receiver. Bus line means connects the output means of said first OR gate to the first input means of said second XOR gate.

Abstract: An attitude determining system for vehicles, such as spacecraft or for ground-based environments measures the angle between a reference and the line-of-sight to a star or other celestial object of known position or to aircraft and missiles. The system includes a rotating scanning telescopic sensor, and a fixed mirror positioned so that the sensor scans both the direct and the reflected line-of-sight of the celestial object in the course of each rotation. Associated transducers and electronic circuits determine the relative angular positions of the telescopic sensor at the instants it detects the direct and the reflected radiation from the celestial object. A computation based on the two angles gives the angular position of the celestial object relative to the vehicle reference. The system cancels or substantially reduces errors due to optical or electronic inaccuracies which identically affect the direct and the reflected angular position measurements.