Abstract: A programmable digital temperature controller apparatus utilizing a pair of binary-coded decimal units and a switching unit to generate a ten bit binary word which represents a pre-selected temperature in a temperature range. A pair of erasable programmable read only memory units store digital temperatures and temperature range information. The ten bit binary word determines which digital data from the memory units will be applied to a D/A converter unit and a pair of multiplexer units. One multiplexer unit controls the voltage per bit within the D/A converter unit while the other multiplexer unit generates a starting voltage. The output voltage from the D/A converter unit and the starting voltage are summed together to provide a voltage output signal which represent the pre-selected temperature.

Abstract: A data buffer apparatus to interface subsystem which operate at differing or varying data timing rates utilizing a random access memory unit for data storage. Input data is clocked into an input register synchronously with an input clock. A write/read sequence generator writes the input data from the input register into the random access memory unit. The write/read sequence generator read data out of the random access memory unit into an output holding register. The data from the output holding register is clocked at an output clock rate into the output data register from which the data is transferred out of the data buffer apparatus.

Abstract: An automatic photographic paper and film developing apparatus utilizing a micro-computer to control the sequential steps of developing film automatically. Once film is loaded in a light tight drum, the steps of filling and draining the developing chemicals and rotating the film drum to develop the film are automatically and sequentially performed under the control of the microcomputer.

Abstract: A pulsed laser radar apparatus utilizing a Q-switched laser unit to generate laser pulse signals including a low intensity trailing tail. The trailing tail is utilized to provide a local oscillator signal that is combined with the target return signal prior to detection in a heterodyned detector unit.

Abstract: A variable gain amplifier apparatus utilizing an amplifier in conjunction with a signal detector and a charge storage device to establish a DC bias voltage which controls the threshold level of the input signal amplifier to maintain a constant input/output signal ratio over a wide dynamic range of the input signal.

Abstract: An anti-flutter apparatus for a head mounted visual display having servo-controlled reflective surfaces to provide corrections to head rotations which occur before a visual scene generation system is able to respond to the head movement.

Abstract: An equalizer cavity apparatus which is directionally coupled to a rectangular waveguide utilizes a circular waveguide with an adjustable RF absorber therein to lower the quality factor, Q, of the equalizer cavity.

Abstract: A positive space-charge closing switch apparatus for closing electrically the gap between a pair of main electrodes with a positive ion beam that is generated by an ion plasma gun.

Abstract: A simultaneous amplitude sequency apparatus utilizing a scanner/modulator unit to scan an image and provide an analog data signal, which is digitized in an A/D converter. The digital data signal is transformed by a Fourier transform unit into a frequency signal. A digital filter which allows only the high frequency terms to pass, preserves the sharp edges of the image that are required in the analysis of the imagery. The correlation portion of the system insures that the applicable amplitude data points are synchronized with the corresponding points in the sequency signal. Thus, compression of the imagery signal is achieved while insuring that the important information is preserved (i.e., sharp amplitude time varying changes). The high order of imagery compression which is in the range of 20/1 insures that the important data is preserved.

Abstract: A high voltage field effect transistor pulse apparatus utilizing majority carrier power field effect transistor in a series configuration to provide a high speed, high voltage output pulse. A fast non-saturating transformer trigger circuit provides a sharp rise time trigger pulse to initiate the high voltage output pulse, while a turn-off circuit provides the off-trigger pulse signal.

Abstract: An eddy current probe calibration standard for calibrating eddy current probes and instruments utilizing calibration discs that provide a standard defect of known dimensions to produce a known repeatable signal. A plurality of round discs with different diameter holes through their centers are respectively provided to accommodate different size probes. Each disc has a defect in the wall of the hole in the form of a slot with known dimensions which will reproduce a known, repeatable signal. A flat, rectangular block which supports the discs, contains surface slots of known dimensions to produce known, repeatable signals for calibration when testing for surface defects.

Abstract: A low frequency pulse generator apparatus utilizing an R-C timing network which includes a plurality of selectable capacitors to provide frequency pulse rates over a predetermined range. A counter which may be set to count a finite number of pulses, controls the generated pulse total.

Abstract: A memory apparatus having a row and column decoder for controlling the read and write function to a transistor memory pair. A single power/chip select pad is utilized to both power the memory and select the memory chip. External control signals are applied directly to critical internal node within the memory apparatus.

Abstract: A scan corrected vidicon camera apparatus utilizing a spatial reference filter with an array of slits that is fitted directly on the faceplate of a vidicon tube. The spatial reference filter is used in conjunction with perturbations that are injected into the vertical and horizontal sweeps. The resultant video waveform is correlated in a microprocessor unit to linearize the respective sweeps.

Abstract: A broad bandwidth surface acoustic wave filter utilizing two broadband surface acoustic wave transducer pairs which individually comprise a single input and output. One pair of broadband surface acoustic wave (SAW) transducers is offset in frequency from a second pair of broadband SAW transducers. Each transducer is tuned with a single series inductor, and then both channels are connected electrically in parallel. The low frequency pair of transducers is tuned for maximum response below their synchronous frequency, and the high frequency pair of transducers is tuned for maximum response above their synchronous frequency.

Abstract: An automatically sequenced signal utilizing cross-coupled monostable multivibrators to provide a signaling sequence on time, off time and a total sequencer on time, thereby permitting a coded sequence signal to be transmitted. The timing interval of the multivibrators may be varied over a predetermined range.

Abstract: A coherent optical feature identifier apparatus utilizing an optical data gathering system in conjunction with a digital data correlator unit to recognize uninterpretable features on photographs. A dual visual display is utilized to compare a desired feature with the Fourier transform correlation from the comparator storage unit.

Abstract: A signal compressor apparatus utilizing a charge coupled device having a charge storage well wherein the charge storage capacity is variable over the integration time of the device. During the minimum charge storage period, the input charge which exceeds an established limit is dumped, thereby providing compression of the input signal.

Abstract: A phase shifter adjustment apparatus utilizing a current source bleed unit to control microwave ferrite phase shifter coils without elongating the switching time. The current sources provide a high impedance to the phase shifter coils thereby minimizing RL time constants.

Abstract: A photodiode detector apparatus having a Gallium Phosphide ion implantation junction thereon to provide high quantum efficiency at wavelengths equal to or less than 0.5 micron incident wavelength while utilizing a shallow junction.