Abstract: A secure read only memory (SROM), i.e. a ROM which may be used in program execution but which prevents easy copying of code embodied therein, is described.

Abstract: Radio frequency sputtering of silicon and chromium alloy targets in a nitrogen and argon atmosphere while applying an electrical bias to the substrate produces an electrically resitive thin film on said substrate.

Abstract: The present invention provides a systolic computational array including two shift registers. Selected ones of the shift register stages are adapted to provide the values contained therein to two multiply-accumulate devices.

Abstract: A magnetic field sensor which may be rendered preferentially sensitive to magnetic field components in each of two, preferably orthogonal, directions by application of appropriate magnetic bias fields is disclosed.

Abstract: A very high hermeticity glass to metal seal comprising a round cylindrically shaped glass member having an outside diameter; a tubular sleeve of resilient metal having (i) a first end with an inside diameter slightly larger than said outside diameter of said glass member, and (ii) a reduced diameter portion adjacent to said first end thereof with the diameter of said reduced diameter portion being slightly smaller than the outside diameter of the glass member; a thin metalized layer on a first end of the glass member adapted to be inserted into said first end of the tubular metal sleeve so as to define an annular gap therebetween, the glass member being inserted as far as possible into the sleeve so that the end thereof is into abutting relation with said reduced diameter portion of said sleeve so as to form a capillary gap therebetween.

Abstract: A selective method of etching chromium is described. In the present invention an etching cycle, including etching with a first solution including potassium permanganate and then with a second solution including oxalic acid is defined. Such a cycle will remove a thin layer of chromium and may be required to be performed a plurality of times to complete the etching process.

Abstract: A system utilizing a plurality of accumulators performing additions and shift and add operations is used to perform a multiply accumulate function at a very high speed.

Abstract: A method of etching a thin film containing chromium using fluorine or a fluorine containing compound without leaving an electrically conductive residue is described.

Abstract: A system is disclosed to charge an output region to a selected voltage in a series of steps, each step raising the voltage of the output region by an amount less than the desired final voltage level. A portion of the system having a control terminal causes the voltage at the output region to increase by a step in response to a change in electrical conditions on the control terminal. Another portion of the system maintains electrical conditions at the pull up means control terminating region between steps. A further portion of the system is also provided to maintain electrical conditions at the control terminal at a level which will prevent the output region voltage from increasing when such an elevated voltage on the output region is undesired.

Abstract: A plurality of electrical isolation devices are provided on a monolithic integrated circuit. Each of the isolation devices includes a current strap and a magnetic field sensor. The current strap is adapted to carry an electrical current representative of a signal to be transferred through that isolation device. The strength of the magnetic field produced by that current is measured by the magnetic field sensor.

Abstract: A system for using optical data processing means to create the ambiguity function for two signals is disclosed. One-dimensional spatial light modulators are employed to code the signals into a beam of substantially coherent light. After the light has been coded with the first one-dimensional signal a Fourier Transform is performed by lens means. A linear phase shifter is placed in the Fourier Transform plane. This has the effect of creating a linear dependence along a second dimension when a second Fourier Transform is performed.

Abstract: An optical system for creating the ambiguity function of a moving target is disclosed. The two signals which are to be used in the analysis are coded on spatial data masks as two-dimensional arrays of one-dimensional functions. The frequency scaling property of a post lens Fourier Transform is utilized to apply a variable scaling factor to at least one of the functions. This is accomplished by passing a beam of substantially coherent light through a cylindrical Fourier Transform lens before it passes through the data masks. At least one of the data masks is then set at an angle other than perpendicular to the beam path.

Abstract: In a system to control a condition of air in a duct, there is disclosed a first nozzle for issuing a jet fluid, a second nozzle for receiving a portion of said fluid depending upon the condition of the air in the duct, and a circuit arrangement for controlling a damper in the duct dependent upon the amount of fluid received by the second nozzle.