Abstract: Tamper test signals of varying magnitude and polarity are randomly applied to electronic sensing circuits to determine integrity of the sensing circuits. A monitoring circuit measures the response of the sensing circuit to the applied tamper test signals and responds to deviations from predetermined information indicative of sensing circuit integrity by generating output signals suitable for control or alarm purposes.

Abstract: A solid state security system employing a single "chip" integrated circuit as the primary electronics located within a compact security console to provide electronic interface with one or more remote monitoring channels including a telephone dialer channel, an annunciator display, a multiplex channel suitable for processing alarm signals from a plurality of security consoles, and an intercom system suitable for providing two-way verbal communication between one or more security consoles and a central control access location.

Abstract: The use of electronically tunable filters permit an efficient extraction of characteristic speech features, such as pitch frequency and the position of spectral peaks, called formants, that are present in vowels and voiced consonants. A pair of electronically tunable active filters each controlled for CF and Q, are utilized to "lock in" on a particular formant and to follow its inflections. The control voltage supplied to the active filters directly corresponds to the formant position and gives an inexpensive and simple technique for the characterization of voiced phonemes.

Abstract: A pulse generator for generating pulses over a wide range without changing scales is disclosed. The pulse generator is capable of generating pulses in the range from 0.5 Hz to greater than 2 MHz in one continuous range. The wide range of operation is achieved by a timing capacitor which is charged at a logarithmic rate with respect to a frequency determining voltage input signal. This permits a wide frequency range to be covered with a reasonable range of the voltage input signal.

Abstract: In a television system, the display by a monitor forms a high resolution window-like frame that is selectively movable about a larger scene which is transmitted as an array of contiguous frames. Separate tracks on a disc-type recorder are used to store a video signal from a camera corresponding to each frame making up the array of contiguous frames in the scene. Either the camera or the scene is repositioned to view each frame in the scene. The video signals are recorded at phase-displaced relations by phase shifting the sweep waveform supplied to the camera while scanning each component of the scene. The replayed video signals corresponding to the array of contiguous frames in the scene are blanked by gates controlled by adjustable delay circuits to select a single frame of unblanked video signal for display by a monitor which corresonds to a portion of the entire scene.

Abstract: An electrochemical device is designed to respond to a constituent such as oxygen in a reactive mixture which may include a fuel such as methane. The device includes an electrochemical cell employing an electrolye such as a stabilized zirconia associated with two electrodes and designed for operation at an elevated temperature such as 200.degree.C to 1000.degree.C. An electrode for such a cell is designed to have no catalytic action on the mixture.The system may be arrnaged to assure a full reaction of the mixture before the cell responds to the desired constituent. Thus the mixture may also be subjected to the action of a catalyst before it reaches the electrode area. If the mixture is applied to another non-catalytic cell before it is subjected to the catalyst further information is obtained concerning the desired constitent.

Abstract: In a solid state security system, a trouble indicator circuit capable of developing both an audio and visual output signal, by providing a visual indication in the absence of a circuit or component failure and an audio initiating signal in response to the presence of a circuit or component failure.

Abstract: A solid state reset circuit responds to the actuation of a single manual device to both transmit reset signals to the input circuitry associated with fire and intrusion sensors of a security system, and to transmit an arm/disarm signal to the intrusion sensor circuitry if an intrusion alarm condition is present and a fire alarm condition is not present. The use of a single manual device to generate both the reset and arm/disarm signals reduces operator confusion.

Abstract: In a solid state security system having a plurality of alarm sensors for generating output signals in response to alarm conditions and a corresponding plurality of resettable latching circuits for developing digital output signals indicative of alarm conditions for processing by logic circuits to develop alarm output signals, an automatic test circuit responds to a single activating signal by sequentially supplying simulated alarm condition signals to the respective latching circuits to determine the operational integrity of the latching and logic circuits. At the conclusion of the test sequence the automatic test circuit transmits reset signals to the resettable latching circuits.

Abstract: A security system adapted for monitoring fire, intrusion, and other alarm conditions employs solid state technology to appropriately identify the monitored alarm conditions and initiate appropriate responses. A "one chip" integrated semiconductor circuit functions as the primary electronics of a master control console to accept both remotely initiated as well as locally initiated input signals and to process the signals and initiate appropriate control and alarm signals. Included on the integrated semiconductor circuit are a digital noise generator circuit, input comparator and latch circuits, system test and reset circuits, and logic circuits for developing digital output signals to both activate monitoring channels and identify the type of alarm condition present.

Abstract: A system for measuring and controlling the concentration of hydrogen in liquid sodium and in gaseous environments is disclosed. The system comprises a reinforced hollow tube-like membrane which is positioned in the sodium or the gaseous environment such that the hydrogen diffuses through the membrane. Hydrogen diffusing through the membrane is removed by an ion pump to maintain a vacuum inside the membrane. The electrical current flowing through the ion pump is an indication of the hydrogen concentration. Alternatively, the hydrogen can be permitted to diffuse through the membrane until an equilibrium condition is established and a high pressure ionization gauge can be used to determine the hydrogen concentration. The membrane includes integral reinforcing sections permitting the membrane to be thin to achieve high sensitivity and withstand a high differential pressure. Valves are included which isolate the membrane from the sodium or gaseous environment so that the membrane can be easily changed.

Abstract: A method and apparatus for digitally addressing an electron beam to select and then scan one of a plurality of spaced apart analog recordings of spoken words on a target. An electron gun at one end of a return beam vidicon tube provides the electron beam to scan the target positioned at the other end of the tube. The target is a wafer of semiconductive material with an oxide layer facing the electron gun. Variable width openings are etched into the oxide layer such that the edges of the openings define analog recordings. A first electron beam deflection control rapidly directs the beam in the "Y" direction along the ends of the tracks to provide a track count for producing a track access signal by a digitally addressed downcounter. A second electron beam deflection control produces a scanning of the selected track in the "X" direction while the electron beam oscillates at a dither frequency in the "Y" direction to scan the width of the track.

Abstract: Undesirable interference beat patterns in the displayed video signals produced by a magnetic record/reproduce head are substantially eliminated by appropriately changing the amplitude of the writing current to the head in synchronism with the polarity reversal to establish a current ratio which will result in uniform spacing between zero crossovers in the voltage output of the magnetic recording system.

Abstract: A tubular soft iron member is slidably positioned within a magnet-coil assembly and adapted to respond to toggle action travel between two magnetically stable states by producing rapid changes in magnetic flux. Electrical pulses developed by the coil in response to the changes in magnetic flux are useful for control and alarm purposes.

Abstract: The invention relates to a trapezoidal, ladder-type coil configuration positioned as an inverted U to provide a passage thereunder for use in conjunction with magnetic field generating and magnetic field measuring circuitry to detect the presence of metal devices associated with objects, i.e., parcels or persons, passing through the passage. The ladder configuration of the coil establishes magnetic fields within the passage which exhibit sufficiently strong components in three orthogonal directions (x, y and z) to assure detection of metal devices regardless of the orientation of the metal devices.

Abstract: .Iadd.A fuel cell and method of operation of same is detailed for measuring oxygen pressure, separating oxygen from a gas, or generating electrical energy. The fuel cell has first and second electrodes of selected materials with a solid partition of a solid electrolyte between the electrodes. The solid electrolyte consists of a solid solution of selected oxides having a high degree of oxygen ion conductivity. .Iaddend.