Abstract: The phosphor screen of a cathode ray tube (CRT) has its phosphor coating protected against damage caused by a stationary or low sweep velocity electron beam that strikes its surface, by removal of the video signal that controls the beam whenever there is a simultaneous presence of video signal and absence of a proper horizontal or vertical sweep signal.

Abstract: A system employing broadband radio frequency vector multipliers in a balang process for nulling out unwanted radio frequency signals. The nulling is achieved by adjustment of both the desired and interference signals as they pass through the system. The adjustment is accomplished by using vector multipliers which shift the phase by equal amounts and vary the amplitude by proportionate amounts of one or more radio frequency signals in response to separate phase shift and amplitude control forces. To obtain a desired phase shift, an incoming radio frequency signal is split into 0.degree. and 90.degree. components. By multiplying the 0.degree. component by the cosine of the desired phase shift angle, multiplying the 90.degree. component by the sine of the desired phase shift angle, and then summing the results, the signal can be phase shifted by any amounts through all four quadrants.

Abstract: An aircraft glide path signal transmission system is provided with an antenna comprising two overlapping arrays which are in turn constituted by a number of antenna elements disposed in a vertical direction, with some of the elements of each array common to the two arrays. The elements which are unique to the respective arrays are fed with separate drive signals and the elements which are common to the respective arrays are fed with a combination of the drive signals.

Abstract: An electronic scan system with excitation arrangement for producing a directive radiation pattern from a circular or cylindrical array at a predetermined pointing angle.The circular or cylindrical array provides random beam pointing. An RF input-output port feeds an equal amplitude distribution network providing as many outputs as there are elements of the array employed at any given time. An equal number of phase shifters is included, and gross beam positioning is effected through selection of the contiguous element group to be excited by means of RF switching. The phase shifters may then be controlled to provide the specific beam pointing or scan desired within the selected sector. The antenna elements of the array are fed through a passive interconnecting matrix responsive thereto, said matrix providing inherent amplitude taper across the effective aperture.

Abstract: A system is provided for reading acoustic images such as those obtainable in an elastic medium as a result of the focusing of, or interference between, acoustic waves. The image analysing device comprises a substrate made of piezoelectric material which is provided on one face with an interdigital array and an electro-acoustic transducer.The system permits to read acoustic images formed at the free surface on the opposite face of the substrate or at a certain distance from its free surface in contact with an elastic propagation medium.

Abstract: A pressure sensitive hydrophone assembly which provides an undiminshed actic sensitivity while discriminating against waves induced in the material surrounding the hydrophone elements by flow and/or vibrational excitation. The hydrophone comprises a ceramic element surrounded by a rigid barrier and an elastic material inside the rigid barrier which is constructed to preclude the arrival of undesired forces at the ceramic element.

Abstract: Error compensating method and means are shown for use in multichannel systems for compensation of errors in the operating characteristics of the individual information handling channels. Offset, gain, linearity and the like, channel transfer function errors, may be compensated for in accordance with the invention. Error compensating signals for the individual information handling channels are stored in error compensating signal storage means and are combined with the channel output signals to compensate for errors therein. A test signal is supplied to the channel inputs, and the compensated channel outputs resultant thereof are compared with a standard related to said test signal. Variations from the standard are used to update the error compensating signals contained in storage.

Abstract: In one of the embodiments disclosed, apparatus is provided for communicating, in digital form, information from a plurality of analog sources located in a borehole to a location on the surface. A multiplexer is provided with a plurality of inputs for connecting the analog signal output of the data sources to an analog to digital converter in response to a sequence control circiut. The analog to digital converter converts the analog signals to digital data signals. A digital address signal is added to each data signal indicating the source of the data. The digital data signals and their addresses are applied to modulate or vary the power factor of power on a power cable mounted in the borehole. Receiver means is provided at the surface location for recovering the digital data and address signals for use on the surface. These signals may be displayed by display means, stored or used in a computer.

Abstract: A twisting distortion correcting circuit to remove the twisting distortion in a picture on a television receiver in such a way that beam current of the television receiver is detected, and the high frequency components and the d.c. components in the detected beam current are removed so as to obtain a voltage wave form analogous to the mean horizontal deflection current wave form, and then the voltage wave form obtained is fed to the horizontal oscillation circuit whose oscillating frequency is controlled by the output voltage of the AFC circuit, whereby the twisting distortion of the picture is corrected by producing the twisting distortion opposite to that of picture caused by a substantial variation of the beam current.

Abstract: Both velocity and x-y deflection magnitude of a cathode ray tube (CRT) electron beam are continuously sensed, and beam intensity is limited to prevent damage to the CRT during periods of insufficient beam deflection.

Abstract: A television receiver includes a switched-mode power supply driven by the horizontal oscillator and driver section of the television receiver. An on/off switch for the receiver is connected to the switched-mode power supply to vary its output according to the setting of the on/off switch. This output, when the switch is "on", is used to supply full operating potential to the cathode ray tube filaments and operating potential for some of the portions of the television receiver. When the on/off switch is in its "off" position, it operates to cause the power supply to supply reduced or standby potentials to those same portions of the receiver and to the cathode ray tube filaments. At the same time, other portions of the receiver are turned off and on in the normal fashion.

Abstract: 1.

Abstract: An acoustic surface wave device comprises a launching transducer and a receiving transducer coupled to one surface of a piezoelectric substrate and including means for suppressing spurious signals developed in the receiving transducer due to acoustic surface waves reflected from the ends of the substrate. In one embodiment the electrodes of both transducers are staggered a quarter wavelength at the mid point of their apertures so that waves received direct from the launching transducer arrive in phase at the receiving transducer whereas end reflected waves arrive in antiphase over the two halves of the receiving transducer aperture.

Abstract: An automatic control for the optimum control voltage during the line flyback time between the control electrode and the cathode of an ACT gun in a television pick-up tube. A variation in the cathode potential during the line flyback requires inter alia an adaptation of the control electrode potential. Without this adaptation a too small beam current on the target would result in an insufficient erasing action while a too large beam current would result in an inadmissible dark current with the risk of persistence upon display (afterglow). In the circuit arrangement a measurement of the beam current is effected through a specific choice of the lens pulse duration at the gun, which beam current becomes available for the erasing action on the target during the line flyback time, and through comparison with a reference value a variable pulse generator is controlled for supplying the control electrode pulse with a given pulse height during the line flyback time.

Abstract: The invention relates to a method of preparing extrinsic semiconductors, useful for electric heating, comprising the step of putting onto a glass, ceramic, etc., surface a transparent semiconductive heating coating of low stable resistance, which is tolerant to high electric loading.As the basic substance of the conductive coatings chemical compounds in which the cation has variable valence, for instance halides or oxides of tin, bismuth or niobium, are used.To the basic substance a thermo-electric buffer is added. This substance supplies a characteristic enabling regulation of conduction in the coating as a function of temperature, as a result of the existence of excess current carriers. At lower temperatures these carriers enlarge the conduction, and at higher temperatures, they diminish the conduction.

Abstract: An electroacoustical transducer assembly employs a plurality of focused poelectric elements. Each of said elements is made of a plurality of individual sections and energized to produce a radiation pattern having desired geometrical properties. The individual piezoelectric elements are figured to improve the frequency bandwidth and to provide for improved electrical connection thereto.

Abstract: This invention relates to an improvement in the art of position determination and in particular to the art of mapping, surveying, station keeping, and the like, employing moving craft and measuring quantities linearly related to the simultaneous variations of the simultaneous distances between the moving craft and a plurality of fixed or mobile station points.

Abstract: In order to guide a plurality of landing craft between, for example, a water-borne location and a shoreline, a first VOR-type transmitter is provided at the water-borne location, and a second VOR transmitter is located on shore. In a debarking operation, vessels beginning at substantially the same water-borne location and heading toward substantially the same shore location at the same time are directed to follow respectively different first radials from the first transmitter and second radials from the second transmitter. In this manner, both reliable guidance for a plurality of vessels and collision avoidance are achieved.

Abstract: A vertical deflection circuit for use in a television receiver, comprising a control circuit for stabilizing the width of a pulse either in a vertical oscillator circuit or between a vertical oscillator circuit and vertical output circuit to thereby stabilize the width of a pulse component included in the vertical deflection output signal.

Abstract: An improved electronically focused imaging system for focusing transmitted acoustic waves into a focal line and for scanning the focal line for waves either reflected or transmitted from an object of interest. The system includes N transducer elements in a transmitter array and N transducer elements in a receiver array. These 2N elements can resolve N.sup.2 locations on the object of interest. In one embodiment the transmitter array is pulsed through a delay line that is activated by two, independent, frequency varying chirp signals. In this embodiment the receiver array is focused to scan the focal line and to develop a rectangular raster so that the output of the system is viewable on an oscilloscope or a television screen. In another embodiment the transmitter array is pulsed by a delay line activated by one chirp signal and a 45.degree. raster is developed.