Abstract: A method for controlling video and audio of a television set using a code in such a manner that a code is set up in a microcomputer of the television set, which is operated normally only when the code is released by input of a key signal corresponding to the code, to output the video and audio signals. Therefore, it is possible to prevent any person who does not know the code from driving the television set. For example, it is possible to prevent children from watching the television broadcast stealthily without notice of adults.

Abstract: An apparatus for a variable depth triangulation ranging system, the ranging system including means for emitting a light beam, means for focusing an emitted light beam on an object, and lens means for imaging reflected light onto an input end of said apparatus. The present apparatus includes an optical fiber bundle, the bundle including an input end and an output end, the bundle input end being disposed so as to intercept transmissions from said lens means, means for scanning, in a time-based manner, the bundle output end, the scanning means being configured to generate a time-based signal indicative of a light signals present at the bundle ouput end, and means for calculating system geometry and range from the time-based signal.

Abstract: The document authentication apparatus provides document authentication and authenticity capability. Document authentication requires that the person to be charged apply an authenticating mark on the document indicating intent to authenticate the document. This requirement is analogous to a signature on a printed document and is implemented in the document authentication apparatus electronically through the use of both hardware and software. A program which immediately checks the identicalness of the document at the transmitting and receiving station through a high speed comparison, locks in the document such that no modification can occur and then awaits authentication handshakes from the two end points. Such authentication is real-time and can be both hardware and software executable, i.e., password and physical confirmation.

Abstract: The distance between two objects, such as aircraft, helicopters and other vehicles, can be determined by transmitting from a first object through atmosphere a first frequency which is absorbed by atmosphere and a second frequency which is not absorbed by atmosphere, receiving at a second distant object the first and second frequencies, and determining from the received first and second frequencies the distance between the first and second objects. In preferred methods and apparatus, the first frequency is a frequency characteristic of atmospheric oxygen absorption (e.g., 760 nm wavelength), and the frequency transmission comprises emitting a laser light beam while modulating its frequency through a frequency range which is greater than a frequency range characteristic of atmospheric oxygen absorption (e.g., 750 nm-770 nm wavelength) and includes a second frequency which is not absorbed by atmosphere.

Abstract: An apparatus and method for detecting when a hole has been drilled through a workpiece by way of a pulse laser drilling process having a machine control for controlling whether the pulse laser drill emits laser pulses. The apparatus detects the laser pulse and produces an output signal representative thereof. The output signal is clipped and compared to a first reference signal for producing a compared output signal when the clipped output signal is greater than the first reference signal. The compared output signal triggers an enabling output signal representative of a pulse having a predetermined interval. The apparatus also detects reflected radiation from an entrance of the hole being drilled to produce an output signal which is then clipped and compared to a second reference signal to produce a disabling output signal when the output signal representative of the reflected radiation is greater than the second reference signal.

Abstract: In an automobile radar apparatus according to the present invention, a light-receiving optical system is rotated in response to an output from an image formation position calculation unit in such a manner that light source is focused on a vertical plane containing an optical axis of the light-receiving optical system; a direction up to the preceding vehicle is calculated from a turning angle in response to an output derived from an angular detecting unit; and a distance up to the preceding vehicle is calculated from an image position of the light source based upon an output derived from the image formation calculation unit.

Abstract: In the copy prevention apparatus and its method, it is discriminated whether an object is legally copied or not; a constant event is generated at or below a predetermined probability; and an abnormal operation is executed only if the two conditions of the object having been determined as an illegal copy, and the event having been generated, are satisfied. Therefore, even if the object is determined as an illegal copy, the abnormal operation is not always executed, but executed at or below a predetermined probability. Although the occurrence of the abnormal operation can be indicated to the user immediately, it is also preferable to keep the abnormal operation occurrence secret for a time and inform the user of the occurrence an appropriate time later.

Abstract: An improved digital communications system is disclosed in which synchronization information is transmitted with the data. A start pulse, having a duration different than the other pulses in the transmitted digital data signal is used to mark the beginning of the frame of digital data. Preferably, a midpoint pulse is also transmitted with the start pulse to mark the midpoint of the frame to facilitate the generation of a local clock signal. Bit positions within the transmitted signal are sampled by sampling pulses which are generated by digital timers having time intervals keyed to the start and midpoint pulses.

Abstract: A broadband, polarization diversity, monopulse antenna comprising a body celed current array and radial arm-coupled log periodic loop antenna in combination with associated mode forming, beam forming and feed networks.

Abstract: A laser system includes a multimode laser diode positioned at a range from a target. Backscatter from the target returns into the diode and to modify the emission. An induced modulation frequency in the emission effects oscillatory mode transitions to create an amplitude modulation in mode power for a selected mode, the mode being selected by an optical spectrum analyser or an interference filter. The diode is positioned initially for a minimum in the amplitude modulation, and readjusted by a selected increment in response to an incremental change in target position so as to reestablish the amplitude modulation to the minimum. The incremental change thereby equals the selected increment.

Abstract: In a correlation-type speedometer which determines velocity by calculating stagger time from a maximum value of the correlation function of outputs from two sensors arranged one in front of the other in the direction of movement, use is made of an oblong slit, a sensor whose light-receiving surface has an oblong shape, a diaphragm having an oblong aperture, or lens that is cut leaving an oblong area through which light can pass. The result is formation of a measurement spot having an oblong shape that is narrow in a forward direction of movement and long in a direction at right angles to the forward direction. In another aspect, two sets of light sources and sensors are arranged so that their relative positional relationships are the same, the light sources are made to flash at different periods and the periodicity of the flashing light sources is utilized to eliminate the influence of light entering the sensor of one set from the light source of the other set.

Abstract: A system and method for detecting defects in composite laminate material are described which comprise a first trtansducer for directing an ultrasonic beam of preselected frequency and tone burst excitation along a transmission axis through a sonic coupling bath onto a surface of the material at a preselected angle to generate Lamb waves in the material and leaky Lamb waves reflected therefrom, a frequency modulator for selectively modulating the frequency of the incident beam, and a second transducer for receiving the reflected sonic field including leaky Lamb waves reflected from the material and for providing a recovered and envelope-detected output signal corresponding to the amplitude of the reflected waves.

Abstract: A method for forming images on a non-reactive substrate such as paper or plastic film is disclosed, comprising the steps of: image-wise exposing an imaging sheet, said imaging sheet comprising a support having a layer of photosensitive microcapsules on the surface thereof, said microcapsules containing a photohardenable or photosoftenable composition including a photoinitiator, and a color precursor; assembling said image-wise exposed imaging sheet with a developer sheet; subjecting said assembly to a uniform rupturing force to cause said photosensitive microcapsules to rupture and transfer an image-wise pattern of said color precursor to said developer sheet thereby forming an image thereon; separating said imaging sheet from said developer sheet; assembling said image-bearing developer sheet with a non-reactive substrate to form a second assembly; and subjecting said second assembly to heat and a uniform force to laminate said image bearing developer sheet to said non-reactive substrate.

Abstract: A dual-beam amplitude-modulated laser transmitter/receiver suitable for laser-radar applications is scalable to high powers because there is no active modulator element that the laser beam passes through. The transceiver comprises a laser source with two separate independent laser optical cavities. Each laser cavity is similar, but each operates at its own frequency. Signals from the two cavities are superimposed at a combining beam splitter to form two transmitter output beams with each combined beam intensity modulated at the laser difference frequency. The output consists of two beams separated in elevation and with equal beam powers from each laser cavity the intensity modulation is 100%. Each beam has its own homodyne detector and separate local oscillator. Thus, each beam path is considered to be a distinct homodyne transceiver. If the frequency of one of the laser sources is changed in time, an AM/FM/CW output suitable for absolute range measurements and fine doppler is generated.

Abstract: A tachometer for measuring speed and armature position of a motor is disced whereby the counter electromotive force present in spikes on the power terminals are shaped, analyzed and displayed as tachometer information. The spikes occur as commutation takes place allowing a coarse angular armature shaft position to also be derived.

Abstract: A cryogenic tank that is made leak-proof under cryogenic conditions by successive layers of epoxy lining the interior of the tank.

Abstract: Digital phase shifter bits of predetermined phase shift capability and lumped element network component fabrication arrangement are described. A variety of phase shifter bits including the capability of eleven and one-quarter, twenty-two and one-half, forty-five, ninety, and one hundred eighty degrees of phase shift are included. Also included are a number of high-pass/low-pass and switching transistor inclusive phase shifter bit arrangements. Both electrical schematic diagram and integrated circuit embodiments of the phase shifting networks are also disclosed.

Abstract: An Inverse Synthetic Aperture Radar (ISAR) imaging system provides an image of an incoming aircraft for the purpose of deciding which retaliatory tactic, if any, will be employed. By estimating change rates in attitude about one or more of the roll, pitch, and yaw axes, for an aircraft on a course toward the search radar, estimates of rate of change provide information from which a reliable ISAR image may be prepared. A more identifiable target and relief from ambiguity about the apparent intentions of the incoming aircraft are the result.

Abstract: This invention is a mechanism for connecting a spiral antenna to a wavegu with very low transmission and reflection losses. The invention provides a smooth broadband transition from a spiral, balanced transmission line through a printed circuit fin-line transition and then to a waveguide TE.sub.10 E-plane transition and extends the use of spiral antennas to millimeter wave frequencies.

Abstract: The Physician Data Query (PDQ) System is a clinically oriented computer data base developed to make recent information on cancer treatment widely available to the medical community. It represents an effort to promote diffusion of information about the treatment of cancer throughout the country, facilitates access to clinical trials, and accelerates the practical application of advances in research. The computer system provides information about state-of-the-art cancer treatment which is updated monthly by an editorial board. It also includes a file of active cancer-research protocols and directory of physicians and organizations providing cancer care to which physicians can gain access by geographic location. The PDQ system provides a search and display method in a simple menu driven process. Transmission of information about cancer over commercial telecommunication networks gives professionals easy access to the system through individual computer terminals.