Patents Assigned to The United States of America as represented by the Director, National Security Agency
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Patent number: 4729632Abstract: Common path time and frequency domain optical adaptive linear predictors are disclosed, characterized by wide bandwidth operation for use in channel equalization, source redundancy removal, speech encoding, and other areas. The predictors are noninterferometric, avoiding the instability of such processors in the prior art.Type: GrantFiled: November 25, 1986Date of Patent: March 8, 1988Assignee: The United States of America as represented by the Director of the National Security AgencyInventor: Jonathan D. Cohen
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Patent number: 4709652Abstract: A pneumatic sweep generator for use as an audio source in tests near vocal frequency ranges. A horn, whose volume may be controlled by air pressure and whose tone may be controlled by air velocity, is connected to an air supply in a dual-circuit arrangement. Mechanical control devices, such as manual and pressure release valves, are located within the circuit to provide for tone and volume control. A reciprocating air cylinder continuously varies the air velocity within the horn to sweep the frequencies in an adjustable manner. Electromagnetic interference is totally eliminated by a complete absence of electrical devices in either the device or in necessary controls.Type: GrantFiled: January 16, 1985Date of Patent: December 1, 1987Assignee: The United States of America as represented by the director of the National Security AgencyInventors: Harold E. Douglass, Jr., Joseph W. Mahaffee, III
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Patent number: 4630285Abstract: A method is disclosed for eliminating group delay distortion resulting from filtering an information-carrying analog signal. The method allows an analog signal to be converted to digital form and back again with zero group delay distortion. The analog signal is first band or low pass filtered with a filter having a pass band substantially larger than that required to filter only the signal of interest. The filtered signal is then digitized at a rate appropriate to the filtered signal, digitally filtered to remove all but the signal of interest, and down sampled to the transmission rate. A substantially reversed process is described for reconverting the digital signal to analog form. The method is shown to be equally effective with a multiplexed signal.Type: GrantFiled: March 18, 1985Date of Patent: December 16, 1986Assignee: The United States of America as represented by the Director of the National Security AgencyInventors: James W. Dyer, Raymond R. Watkins
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Patent number: 4579421Abstract: An electrooptic apparatus is disclosed for linear predictive adaptive filtering. The apparatus combines the desirable filtering effects of a correlation cancellation loop method of linear prediction with the parallelism and large bandwidth capabilities of optical processing.Type: GrantFiled: October 5, 1983Date of Patent: April 1, 1986Assignee: The United States of America as represented by the Director of the National Security AgencyInventors: Douglas E. Brown, Joanne F. Rhodes
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Patent number: 4567572Abstract: An information processor is described which is especially suitable for efficiently sorting large quantities of binary data. Data in a plurality of storage devices is fed to a plurality of compare-exchange modules and is then selectively passed back to the storage devices by means of multi-input switches. A programmable microprocessor controls passage of data through the various components in an iterative process.Type: GrantFiled: February 22, 1983Date of Patent: January 28, 1986Assignee: The United States of America as represented by the Director of the National Security AgencyInventors: S. Brent Morris, Richard A. Wisniewski
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Patent number: 4497042Abstract: An apparatus for controllable propagation of magnetic domains, or bubbles, through an arrangement of closely spaced magnetic propagating elements arranged in an input stage, a strip-former stage, and a decoder stage. Binary logic circuitry results from selective control of bubble movement through alternate paths of elements, with at least one of said paths producing a domain strip extending the full height of the strip-former stage. The decoder stage includes a propagating element spaced apart from the strip-former stage a distance sufficient to prevent propagation of all domains in the strip-former stage except for the full-height strip. The asymmetric geometry of the strip former stage makes the full elongation of a bubble dependent upon which input provided the bubble.Type: GrantFiled: September 19, 1983Date of Patent: January 29, 1985Assignee: The United States of America as represented by the Director of the National Security AgencyInventor: Richard P. Williams
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Patent number: 4468093Abstract: A hybrid space/time integrating optical ambiguity processor in which time-sequential segments of a spatially modulated optical signal are received in a two-dimensional optical modulator. The output of the optical modulator is periodically imaged along one axis and transformed along a perpendicular axis, and the result is detected for further use. Two embodiments of the two-dimensional optical modulator are described; one utilizing an electrical-to-optical transducer and one utilizing an optical-to-optical transducer.Type: GrantFiled: December 9, 1982Date of Patent: August 28, 1984Assignee: The United States of America as represented by the Director of the National Security AgencyInventor: Douglas E. Brown
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Patent number: 4468789Abstract: An improved method for serial transmission of binary data. Data words are conveyed over a communications path by means of four discrete signals. Bit value detection circuitry within the transmitter sequentially tests the untransmitted bits. Upon detection of only a single value in all of the untransmitted bits, the value being all ZEROs or all ONEs depending on the embodiment, an end of word signal is transmitted. In the receiver, a register is initialized to the predetermined single value state. Upon receipt of a signal representing the alternate state, the corresponding bit in the register is changed. Receipt of the end of word signal stops the process, at which time the register contains the word which was to be transmitted, thus accelerating the speed at which certain words may be transmitted.Type: GrantFiled: November 16, 1981Date of Patent: August 28, 1984Assignee: The United States of America as represented by the Director of the National Security AgencyInventor: William E. Gromen
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Patent number: 4440472Abstract: A space integrating optical ambiguity processor in which two one-dimensional modulators provide two-dimensional processing capability. Signals to be processed drive orthogonal Bragg cells oriented 40.degree. to the axes of the output detector. The resulting product is transformed in one dimension and imaged in the other, thereby creating a light intensity distribution representative of the cross ambiguity between the input signals.Type: GrantFiled: April 24, 1981Date of Patent: April 3, 1984Assignee: The United States of America as represented by the Director of National Security AgencyInventor: Jonathan D. Cohen
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Patent number: 4435783Abstract: An apparatus for controllable propagation of magnetic domains, or bubbles, through an arrangement of closely spaced magnetic propagating elements arranged in an input stage, a strip-former stage, and a decoder stage. Binary logic circuitry results from selective control of bubble movement through alternate paths of elements, with at least one of said paths producing a domain strip extending the full height of the strip-former stage. The decoder stage includes a propagating element spaced apart from the strip-former stage a distance sufficient to prevent propagation of all domains in the strip-former stage except for the full-height strip.Type: GrantFiled: April 6, 1981Date of Patent: March 6, 1984Assignee: The United States of America as represented by the Director of the National Security AgencyInventor: Richard P. Williams
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Patent number: 4429180Abstract: An apparatus for simultaneously generating identical cipher key at two remote terminals in a manner which prohibits interception of the key by unauthorized persons. A circuit comprising three separate wire lines is connected between the two terminals over geographically separated routes. The circuit is randomly completed and broken by a switch at each terminal, the switch position being determined at each terminal by an independent key generator. Cipher key is communicated by comparing the key generator output and the circuit condition.Type: GrantFiled: May 19, 1980Date of Patent: January 31, 1984Assignee: The United States of America as represented by the Director of the National Security AgencyInventor: Willard C. Unkenholz
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Patent number: 4413879Abstract: An optical fiber having a parabolic-index profile is etched to a taper below the cladding layer. A prism contacts the taper along its length within the etched portion of the fiber, and coherent light is transmitted through the prism into the fiber. Selective control of the light beam entry angle, entry position along the taper, and control of the etching depth allows excitation of specific modes within the fiber and maximization of coupling efficiency.Type: GrantFiled: October 15, 1979Date of Patent: November 8, 1983Assignee: The United States of America as represented by the director of the National Security AgencyInventors: John W. Berthold, III, Paul S. Szczepanek
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Patent number: 4383261Abstract: An improved method and apparatus for laser recording of information onto a metal film by dynamically heating the film immediately prior to recording. A single track of information is recorded by directing two laser beams onto the film. An unmodulated preheat beam supplies energy to raise the temperature of the metal film to just below that required for recording. A modulated write beam then provides sufficient additional energy to selectively raise the temperature of the film to a necessary level for recording of data.Type: GrantFiled: August 21, 1980Date of Patent: May 10, 1983Assignee: The United States of America as represented by the Director of the National Security AgencyInventor: Mark W. Goldberg
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Patent number: 4350984Abstract: A method of position fixing an active transmitter source. At least two passive receivers are utilized to position fix at least one active transmitter source by obtaining the difference of the doppler frequencies received at the passive receivers, the receivers being tuned to the transmitter frequency. This differential doppler frequency is processed together with navigational information relative to the passive receiver positions at selected measurement intervals along a given measurement path of receiver movement, in order to fix the unknown position of the active transmitter source.Type: GrantFiled: June 5, 1969Date of Patent: September 21, 1982Assignee: The United States of America as represented by the Director of the National Security AgencyInventor: Robert H. Fisher
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Patent number: 4342111Abstract: A digital bridge for a telephone conferencing circuit which provides multiple conferencing capability. Microprocessor signals to a buffered memory control switching of parallel communications data into a time division multiplexed serial stream for transmission, with the position of data within each frame of the stream being a function of the intended destination. High speed switching capability results from the buffered memory circuit which is simultaneously filled with new data as current data is utilized.Type: GrantFiled: November 18, 1980Date of Patent: July 27, 1982Assignee: The United States of America as represented by the Director, National Security Agency, U.S. GovernmentInventor: Donald G. Busson
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Patent number: 4262992Abstract: A variable integrated optical logic element, formed on a substrate of electro-optic material, capable of being controlled to perform the six basic logic operations AND, OR, EXCLUSIVE OR, NAND, NOR and EXCLUSIVE NOR. The optical logic element comprises a plurality of single-mode optical waveguides which form a group of parallel and series equal-arm interferometers. The optical logic element operates on the principle of constructive and destructive interference between light beams. Voltage means are provided for varying the index of refraction of certain of the optical waveguides, to produce relative phase differences in the light energy propagating therein. By inducing phase shifts in the light energy propagating in appropriate waveguides, each of the six basic logic operations can be performed. Also disclosed is an electrically passive, phase-sensitive optical coupler, which is used for switching light energy between waveguides.Type: GrantFiled: April 18, 1979Date of Patent: April 21, 1981Assignee: The United States of America as represented by the Director of the National Security AgencyInventor: John W. Berthold, III
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Patent number: 4225938Abstract: Disclosed are acousto-optical information processors employing a two-dimensional, time-integrating architecture. These three-product type processors are multi-purpose processors which can perform a variety of complex signal processing operations in two-dimensions, without requiring two-dimensional spatial light modulators. Typical of these processing operations are two-dimensional correlation, spectrum analysis, and cross ambiquity function processing. Some of the two-dimensional processing operations are made possible by the incorporation into a two-dimensional correlator of a distributed local oscillator, which may be implemented with mechanical-optical or electro-optical techniques. The acousto-optical processors may be easily implemented with readily available optical and acousto-optical components.Type: GrantFiled: December 5, 1978Date of Patent: September 30, 1980Assignee: The United States of America as represented by the Director of the National Security AgencyInventor: Terry M. Turpin
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Patent number: 4161032Abstract: Compact arrangements of two-input magnetic bubble logic gates providing bubble devices for performing serial integer arithmetic on binary integers are disclosed. Using only a small number of different types of logic gates, designs are given for devices for performing serial addition, subtraction, multiplication and division arithmetic operations on binary integers, represented as sequences of magnetic bubbles. All logical interactions use bubble repulsion to prevent bubbles from transferring to adjacent propagation paths via preferred transitions. By using only two-input gates and a pipeline computational structure, hardware design is simplified and advantage is taken of the inherent serial nature of bubble technology. The simple gate interconnection geometry has a minimum of feedback paths and results in devices which are not burdened with excessive numbers of bubble generators, annihilators or crossovers.Type: GrantFiled: February 16, 1978Date of Patent: July 10, 1979Assignee: The United States of America as represented by the Director of the National Security AgencyInventor: Richard P. Williams