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| Number | Title | Issue Date |
| 4410954 | Digital frequency synthesizer with random jittering for reducing discrete spectral spurs A digital frequency synthesizer for synthesizing a selected frequency or a library of preselected frequencies in which a selected phase increment is fed at a clock rate to an adder and accumulating register in mutual cooperation as a digital integrator, t... | 10/18/1983 |
| 4389538 | Multiplexer for single-octave data processor A multiplexer for allowing multi-octave processing of sampled data by means of a common single-octave data processor. Sampled data is preselectively delayed, corresponding to delay-coding thereof, and a multiplex switch samples the progressively delayed d... | 06/21/1983 |
| 4344151 | ROM-Based complex multiplier useful for FFT butterfly arithmetic unit A four-port digital complex multiplier useful for FFT butterfly arithmetic units and in which ROM's are employed as square function look-up tables. Each of the four ports is responsive to a respective one of the component values of two complex numbers. Th... | 08/10/1982 |
| 4315319 | Non-linear signal processor A device for the correction of signal distortion occurring in a signalling channel. Compensatory amplitude adjustment is made to a sampled signal in accordance with the statistical deviation of the signal from a preselected statistical model. Signal sampl... | 02/09/1982 |
| 4313174 | ROM-Based parallel digital arithmetic device A fully-parallel digital arithmetic device for obtaining the square, C2, of a value, C, via parts of the value C and involving a reduction in memory requirements. Three square function ROM's are employed, one responsive to the most significant-... | 01/26/1982 |
| 4310807 | Digital position sensor including L/C sensing oscillator A position sensing element forms a reactance (inductive or capacitive) in the L/C tuning circuit of an oscillator. The reactance varies as a function of the position of the sensing element relative to a predetermined object. This causes the resonant frequ... | 01/12/1982 |
| 4307690 | Electronic, variable speed engine governor A speed regulator or governor for an engine. The governor utilizes the approximate digital equivalent of a lead and a lag feedback network in combination with a stored, digital, nonlinear look-up table, or other nonlinear means, to control engine speed. T... | 12/29/1981 |
| 4275605 | Acceleration sensitive gyroscope stabilized platform An inertial measuring unit which precesses about the direction of apparent acceleration as a consequence of the introduction of a mass unbalance to each of the gyroscopes in the inertial measuring unit. The mass unbalances and the rotational moments of in... | 06/30/1981 |
| 4275452 | Simplified fast fourier transform butterfly arithmetic unit An improved organization for a FFT analyzer (or periodic function analyzer) having a reduced computing complexity. A modified organization comprises a simplified butterfly arithmetic unit in which the usual two coefficient registers or memories are requir... | 06/23/1981 |
| 4236224 | Low roundoff noise digital filter An error feedback circuit is employed in a digital filter to significantly lower noise in the output by feeding back the least significant (roundoff) output bits of the quantizer rather than throwing these bits away as is done in the prior art. The feedba... | 11/25/1980 |
| 4225850 | Non-fingerprint region indicator Signalling means for enhancing the performance of automatic fingerprint identification systems by reducing system response to non-fingerprint-like regions within an image field pattern of interest. A two dimensional generalized sequency analyzer, such as ... | 09/30/1980 |
| 4222617 | Self loading cylindrical autolubricated gas bearing A journal-type bearing the shaft member of which is divided into two or more cylindrical sections having their axes offset from each other and from the rotational axis thereof. As the shaft member rotates, viscous forces act upon said cylindrical sections... | 09/16/1980 |
| 4219276 | Detection system for ring laser gyro A detection system for a ring laser gyro includes an array of photo-diodes mounted in the path of the laser beams, preferably on one of the laser mirrors. The outputs of the photo-diodes are selectively fed to first and second differential amplifiers to p... | 08/26/1980 |
| 4215936 | Shared pointing for offset target of an adaptive phased array A coherent optical adaptive system employs phase conjugation for locking the beam of a phased array of laser transmitter to a target, focusing the beam on the target and compensating for distortion and disturbances both within the system and in the propag... | 08/05/1980 |
| 4207624 | Frequency domain adaptive filter for detection of sonar signals An adaptive filter for sonar signals which operates on the complex spectral components of the received signal, which signal has been transformed into the frequency domain by means such as the Fast Fourier Transform. The adaptive filter consists of a plura... | 06/10/1980 |
| 4189116 | Navigation system This invention concerns a navigation system of the type utilizing proportional navigation guidance laws to guide an aerodynamically controlled body tracking a target, and particularly relates to a navigation system mechanization wherein necessary body-to-... | 02/19/1980 |
| 4187519 | System for expanding the video contrast of an image A system, and method, is disclosed for substantially increasing the dynamic range of contrast of an input sequence of pixels representative of an image. In a preferred embodiment a first circuit is responsive to an input sequence of pixels representative ... | 02/05/1980 |
| 4179693 | Autonomous, check-pointing, navigational system for an airborne vehicle An autonomous navigational system for an airborne vehicle is disclosed which automatically updates its position and heading coordinates at each of a plurality of checkpoints along a preselected flight path. Prestored in a memory of the navigational system... | 12/18/1979 |
| 4177430 | Adaptive noise cancelling receiver A receiving system is described which has the capability of substantially cancelling broadband noise, such as impulse noise, atmospheric noise, electrical line noise and receiver front end noise, from a selected radio frequency passband. In a first embodi... | 12/04/1979 |
| 4174496 | Monolithic solid state power controller A monolithic solid state power controller generally comprises a power supply, zero voltage crossing detector, operator interface circuitry, current sensing and trip timing logic (having zero current detection capability), drive circuitry, and a power swit... | 11/13/1979 |
| 4163954 | High energy coherent pulse source for laser system A multiple frequency laser technique for enhancing the detection of discrete targets amid a clutter background while also increasing the range performance or power limits of the laser type radar. Each of a plurality of laser oscillators cooperates by hete... | 08/07/1979 |
| 4163257 | Spatial toner for image reconstitution An apparatus is described which is responsive to a sequence of received data-compacted pixels representative of a coarse two-dimensional image of a remote scene for reconstituting picture point intensity signals representative of the smoothly shading in o... | 07/31/1979 |
| 4156230 | Method and apparatus for automatic extraction of fingerprint cores and tri-radii A method and apparatus for the smoothing and singularity detection of the ridge contour data of a fingerprint image for classification in an automatic fingerprint identification system. A template scanning window is passed electronically over a digital ma... | 05/22/1979 |
| 4153900 | Phase-coded pulse compression type pulsed energy system In a binary phase-coded pulse compression type pulsed energy system, means for synchronously transmitting two separately binary coded signals, the code for each signal having an autocorrelation function exhibiting a maximum synchronously occurring with th... | 05/08/1979 |
| 4151512 | Automatic pattern processing system An automatic system is described wherein pattern representations of epidermal ridges, such as fingerprints, are uniquely described by the extraction of specific information. Specific information such as ridge contour data, describing the ridge flow in the... | 04/24/1979 |
| 4143285 | Data smear compensation in charge-transfer-device analog shift registers A device for correcting charge-transfer inefficiency-induced distortion in charge-transfer-device analog shift registers. The shift register successively samples a data line of interest, a voltage reference source and a null input. A preselectively modele... | 03/06/1979 |
| 4136287 | Input phase modulation correction for charge-transfer-device analog shift registers A device for correcting charge-transfer inefficiency-induced distortion in charge-transfer-device analog shift registers. The shift register successively samples a data line of interest, a voltage reference source and a null input. A variable time-delayed... | 01/23/1979 |
| 4135147 | Minutiae pattern matcher A system which, in one exemplary embodiment, comprises first means responsive to minutiae of first and second fingerprints for selectively generating a plurality of neighborhood comparison signals indicative of the closeness of match and coordinate displa... | 01/16/1979 |
| 4128837 | Prediction computation for weapon control In an airborne armament fire control prediction computer, apparatus for computing smoothed inertial velocity and acceleration components of an observed target in a three-dimensional Cartesian coordinate system. A target tracking sensor mechanization is pr... | 12/05/1978 |
| 4113387 | Dual mode laser optics control for ring laser gyro In a ring laser type gyro, laser optics adjustment means comprising a duo-mode bimorph device for separately controlling each of the optical length and alignment of the gyro laser optics.... | 09/12/1978 |
| 4112428 | Clocked precision integrating analog to digital converter system An analog to digital converter wherein an incremental pulse width modulator controls first and second modes of operation of a bridge network of switches such that the bridge network of switches passes a precision current from a current source into a summi... | 09/05/1978 |
| 4099876 | Phase-coded control for ring laser gyro In a laser gyro, laser optics adjustment means comprising a mirror within the laser optics of the gyro and mounted upon a three-terminal duo-mode bimorph device for duo-mode modulation of the laser optics. A two-stage differential amplifier is responsivel... | 07/11/1978 |
| 4096448 | Phase-locking of independent laser oscillators In a multi-element array of laser oscillators, each having a control input for adjusting the output laser light frequency thereof, apparatus for phase and frequency locking each laser oscillator of the array to a reference laser oscillator. An optical pha... | 06/20/1978 |
| 4074580 | Electrostatic pickoff system for ball gyros of the electrostatic levitation type The invention is directed to an electrostatically supported ball type gyroscope pickoff system for determining the attitude (i.e., angular orientation) of the ball spin axis relative to the gyroscope case for any arbitrary attitude. The gyroscope case is ... | 02/21/1978 |
| 4070671 | Navigation reference system A set of three or more acoustic transponders positioned below the surface of the ocean is provided with logic circuitry that enables location of transponder positions merely by listening to transponder signals and also enables location of an unknown recei... | 01/24/1978 |
| 4066964 | Communication system This invention relates to a communication system wherein a plurality of stations can communicate with each other, without going through a central switchboard; and more particularly to such a communication system that is as private as possible -- the commm... | 01/03/1978 |
| 4059790 | Non-oscillating torque control apparatus An apparatus is disclosed for generating a non-oscillating torque wherein a magnetic induction torquer having a first coil for clockwise torque and a second coil for counter-clockwise torque is utilized. The coils are selectively driven from a constant cu... | 11/22/1977 |
| 4048859 | Laser accelerometer An optical element formed of birefringent material is placed in the resonant optical beam path of a gas laser. A proof mass is fixedly attached to the birefringent element to form an integral unit therewith, this unit being contained within the same chamb... | 09/20/1977 |
| 4042822 | Laser radar device utilizing heterodyne detection A laser beam is expanded by means of a beam expander device, the expanded beam striking the surface of a mirror which has an aperture formed therein. A portion of the beam passes through the aperture and is focused so that it strikes an optical detector. ... | 08/16/1977 |
| 4038495 | Speech analyzer/synthesizer using recursive filters A speech analyzer and synthesizer features a digital adaptive linear predictor, using a recursive (rather than transversal) filter in a negative feedback loop which develops both feedforward and feedback filter coefficients. An input circuit is responsive... | 07/26/1977 |
