Abstract: Power for an r.f. oscillator/modulator located at the antenna input terminals of a television receiver is derived from synchronization signals generated remotely from the receiver and applied to the r.f. oscillator/modulator via a cable.

Abstract: Reduction of interference from off-frequency signals in an a.m. receiver is achieved by substituting an average detector for the conventional peak detector employed in such receivers. Conversely, enhancement of off-frequency signal reception is achieved by employing an average detector in parallel with a peak detector with their outputs subtracted.

Abstract: A beam projector is provided by a plurality of coded reticles mounted on a spinning disc and illuminated by a laser source. In order to maintain a constant irradiance on a receiver variably located in space a pseudo-zoom assembly is provided including a moveable source and/or condenser optics. Also, plural focal length optics are employed to expand the range over which the constant irradiance is maintained beyond that realizable by the pseudo-zoom assembly itself.

Abstract: Apparatus for generating horizontal and vertical synchronization signals in synchronism with synchronization signals generated from an on-going television program received by a user is provided by employing a capacitive or inductive coupling to extract the electric or magnetic field surrounding the horizontal output transformer and deflection yoke of a television receiver and shaping the output of the coupler to provide pulses at the horizontal synchronization rate of the received program. These pulses are further multiplied, divided and shaped to provide vertical synchronization pulses. The dividing circuits include means for temporarily changing the divisor to accomplish proper framing. Auxiliary presentations can be displayed in conjunction with programs normally received by synchronizing the auxiliary presentations with the received programs by employing the generated synchronization signals.

Abstract: Apparatus is herein disclosed for imminent collision detection equipment for acknowledging proximity between a first object carrying the equipment and a second object. The imminent collision detection apparatus is a radio distance measuring device and includes a transmitter and a receiver. The transmitter has a pulsed energy output which is reflected back by a target and mixed with a reference source of pulsed energy generated a predetermined time after the transmitted output and coherent thereto. The coherent feature of the equipment lies in the fact that the transmitter pulsed output and the pulsed reference signals are both generated with the same starting phase each generated pulse. Furthermore, the transmitted and reference signals are jittered to provide a resistance to countermeasures capability.

Abstract: A sidelobe cancellation system in which the cancellation loop is insensitive to both target and clutter signals is disclosed including a correlator wherein the video inputs thereto are timegated to exclude all but maximum range signals and the gated video is further bandpass filtered to exclude the mainlobe and first sidelobe of the radar video spectrum.

Abstract: Focus correction in a laser to compensate for thermal lensing effects in the laser rod is achieved by applying a system of loads to the H.R. mirror of the laser cavity to develop a deformation thereof that counteracts optical path distortion of the laser rod occasioned by the thermal lensing effects therein.

Abstract: In a television system, a digital video system permits the transmission of data along with the usual television picture. The television picture field includes one or more selectively addressable areas and the data is imprissed on these areas as digital, binary-coded brightness modulations at rates greater than the vertical field rate. At the receiving end of the system, the viewer positions one or more light sensors opposite these screen areas. The light sensors respond to the binary-coded brightness modulations by developing corresponding binary-coded digital electrical signals. The data stream from a light sensor can then be decoded by a demodulator/decoder operated by the viewer.

Abstract: In a television system, a multiplexing system permits the simultaneous transmission of two or more images with apparent full resolution, but without a corresponding increase in required transmission bandwidth. The television transmission uses the method of interleaving successive scan lines from different picture sources, such as two TV cameras, these sources being synchronized by common horizontal and vertical synchronization signals.

Abstract: A laser comprising a plurality of laser discs disposed normal to the laser beam propagation path within a cavity and including prisms between the laser discs to redirect the pump light onto the faces of the laser discs.

Abstract: A room temperature opticaly pumped solid state laser operating in the 0.8 to 0.9 micron region with inherently low beam divergence enchances covert laser systems because of compatability with high quantum efficiency low noise photocathodes.

Abstract: Compensation for spin rate variation of an inertial measurement device comprising at least one translational acceleration transducer which is spun is achieved by passing the output signal from the translational acceleration transducer(s) through a circuit which has a frequency response inversely proportional to frequency.

Abstract: Frequency memory apparatus in which an input signal is stored in a regenerative oscillatory loop. The phase delay of the loop is adjusted during the time of the first recirculation of the pulse in increments of 90.degree. in one embodiment and increments of 180.degree. in another embodiment so as to concentrate the output power at the frequency of the input signal. Other illustrated features include a relatively long term multi-loop frequency memory, enhancement of the input dynamic range and elimination of a phase error problem in the first recirculated pulse.

Abstract: A radiation sensor including an inner detector surrounded by an array of outer detectors is employed in radiation tracking apparatus which is capable of tracking a true target in a field of targets which may include a decoy or false target. The apparatus includes a color filter arrangement and a reticle which cooperates to produce pulses of long and short wavelength filtered infrared radiation upon the outer detectors of the sensor. The apparatus includes means for processing the signals produced by the outer and inner detector elements so as to discriminate between true and false targets and cause the tracking apparatus to track a true target.

Abstract: Pulse detection apparatus for optical signal pulses including ultra-violet and infra-red frequencies. A photoconductive detector cell has four ohmic output electrode terminals disposed in a rhombic pattern and a centrally disposed input electrode terminal coupled to a source of direct current bias signal. Each pair of oppositely disposed output terminals defines an axis orthogonal to that defined by the other pair. Each pair of output terminals is coupled to a signal translation device such as a transformer with a center tapped primary or a differential amplifier. A pair of output signals are produced indicative of the degree of unbalance of the cell due to an optical signal impinged thereon.

Abstract: Optical detecting, tracking and indicating apparatus for producing a target angular position signal independent of target intensity. A photoconductive detector element has four outer electrodes disposed in a rhombic pattern and a centrally disposed inner electrode. A pair of quadrantly phased, alternating current primary bias signals are coupled to oppositely disposed electrode pairs. The central electrode is coupled through a load impedance and a source of secondary bias signal at a second frequency differing from the first bias signal frequency. A composite signal including both phase and frequency components of the primary bias signals appears in the output. The composite signal varies with target position and intensity. A secondary output signal at the second frequency varies only with intensity. A divider circuit divides the composite signal by the secondary signal to produce an output signal which varies only in accordance with the relative position of radiant energy impingent on the photoconductor.