Abstract: A system connectable into standard television receiver systems for converting predetermined channels thereof to audio only channels and detecting selection of the predetermined channels to cause blanking of the picture tube at individual receivers in the system. The antenna or cable input is altered by supplying a carrier with audio, code and horizontal sync information at a frequency corresponding to that of an unused channel. A tone decoder is responsive to the code and horizontal sync information to cause blanking of the display while the audio information is reproduced in normal manner.

Abstract: A battery operated standby inverter power supply uses an electromechanical relay switching network to connect and disconnect line power between input and output terminals. An overcurrent relay pulser rapidly opens the switching system relay contacts upon transition to battery mode, and a breakover diode network accelerates field collapse in the relay coil attendant to reversion of the relay to its normally closed condition attendant to each battery to line transition. A fault detector establishes acceptable line voltage thresholds, the exceeding of either of which triggers operation from line to battery mode. These triggering thresholds are automatically pulled closer together during initial system startup. During system startup and attendant to each battery-to-line transition, the fault detector is momentarily latched to indicate acceptable line voltage conditions, thereby removing its susceptibility to transient retriggering.

Abstract: A fiber optic connector assembly for terminating and connecting fiber optic cables. The assembly comprises a housing, which housing comprises a pair of separable portions which may be locked together, with each of the housings carrying a plurality of fiber optic connector halves. The fiber optic connector halves, when connected, comprise a pair of ferrules, each having a bore proportioned to receive the stripped end of one of the cables having an exposed fiber optic core end. The ferrules have outer walls that are parallel to the axis of the bore. An outer sleeve is present defining a tubular portion for snug contact with the ferrule outer walls while the ferrules are in end-abutting relation. The relative transverse positioning of the ferrules in an abutting relation is determined by the position and shape of the tubular portion and its engagement with the ferrule outer walls. Thus, fiber optic core ends within the abutting ferrules may abut each other with precisely controlled transverse alignment.

Abstract: An implosion-resistant cathode-ray tube has an evacuated envelope with a faceplate which includes a substantially rectangularly-shaped viewing portion that extends to a peripheral sidewall. The sidewall has corners with a given radius of curvature which extends into flattened portions. An implosion protection band extends around the sidewall. At least one mounting lug having a base portion and an upstanding attachment portion cooperates with the implosion protection band. The base portion of each of the mounting lugs includes a shoulder projection which substantially conforms to the given radius of curvature of the corners of the sidewall. The attachment portion of the mounting lug is located along a section of the flattened portion of the sidewall of the faceplate panel.

Abstract: A surge protection circuit for insertion into a coaxial cable system is configured as a coaxial structure of given characteristic impedance extending between matching input and output connection. A surge suppression network is built into the coaxial housing, and includes a shunt inductor shunting the center conductor at an intermediate point to the housing. A capacity is series-inserted into the output section of the center conductor beyond the inductor. The capacitor is a plate-shaped element metalized on both faces and edge-inserted into the confronting line sections of the center conductor and soldered thereto, so that capacitor lead inductance is incorporated into the center conductor. At the passband frequency of cable television communications the reactance of the inductor is high compared to the characteristic impedance, and similarly the reactnace of the capacitor is low, resulting in negligible insertion loss to the system.

Abstract: A low cost, highly accurate hand operated magnetic character recognition document reader magnetically recognizes magnetic ink (MICR) characters imprinted on documents manually conveyed past a magnetic read head. The reader incorporates the invention described in commonly assigned U.S. Pat. No. 4,143,355 to MacIntyre to permit relaxation of the requirement of constant document velocity. The document is manually conveyed through a defined slotted path so that the characters are scanned by a magnetic read head. The slotted path is established by a pair of substantially parallel (preferably vertical) track members and a bottom wall which is joined to, and separates, the track members by a dimension sufficient to laterally support the document, yet permits it to be conveyed along the path without substantial drag being imparted.

Abstract: An optical code track supporting structure for providing position data about a moveable object. The encoder has an outside portion and an inside portion connected by a series of evenly spaced spokes which form a clear index track which allows substantially all of a light beam to be transmitted therethrough. The index track also has a single index element located therein which fully blocks the light beam for one brief pulse during one cycle of the moveable object.

Abstract: An oscillator includes a mechanical resonator, such as a crystal, and having an amplifier arranged for oscillating at a first frequency. A resonant circuit is coupled in series with the crystal. The resonant circuit is antiresonant at an undesired harmonic frequency of the crystal thus prohibiting oscillation of the oscillator at said undesired harmonic frequency. The present oscillator is a portion of a phase locked loop used in a television receiver for demodulating a composite stereophonic audio signal.

Abstract: An ultor voltage power supply includes first and second transformer windings that are coupled in series for producing corresponding first and second flyback pulse voltages. A first protection circuit disables the generation of each of the pulse voltages when the amplitude of the first pulse voltage becomes excessive. A second protection circuit disables the generation of each of the pulse voltages when the amplitude of the second pulse voltage becomes excessive.

Abstract: A television system including a memory for storing subsampled fields in different sectors corresponding to respective small pictures of a rectangular multi-picture array, includes apparatus for expanding the subsampled fields, preferably to full-screen size, as they are read-out of the memory. When the stored sub-sampled fields correspond to different fields of the same video signal, the arrangement provides for a re-animated version of multi-picture array in a so-called "instant replay" mode of operation.

Abstract: A method of salvaging a color selection electrode for a CRT having a coating of a compound of a heavy metal and an alkali silicate on a surface of the electrode includes the steps of immersing the electrode in a stripping solution consisting essentially of ammonium bifluoride, a suitable detergent, and water; agitating the solution to remove the coating from the electrode; rinsing, and then drying the electrode.

Abstract: A low level strain gage transducer including housing which supports a strain member having a fixed end member and a free end member in the form of a cup, the free end member supported by a folded arm arrangement including one or more arms which permits the element being monitored for strain forces to pivot with respect to the cup so as to to accommodate any mis-alignment forces applied to the cup that would otherwise generate bending forces resulting in erroneous strain measurements.

Abstract: Switches are cascaded for improved off-state attenuation. The first switch of the cascade comprises an L-type attenuator with series branch including a resistor and a shunt branch including a Zener diode. A bias network coupled to the attenuator and to the second switch of the cascade connection controls the diode bias for operation at a specific forward conduction when the second switch is open and for operation at a specific reverse bias condition when the second switch is closed for causing the attenuator to provide the plural functions of (1) enhancing the switch off-state attenuation, (2) providing over-voltage and overcurrent protection for input transients of either polarity and (3) providing a predetermined output DC level when the second switch is on for establishing the DC bias of a subsequent circuit, such as an amplifier, the DC bias so supplied being in a tracking relationship with DC power supplied to the subsequent circuit.

Abstract: A method for uniformly beveling an inside edge of a glass article having an opening at one end thereof includes the steps of: providing a plate having a peripheral shape generally corresponding to that defined by the edge of the glass article, the plate having a beveled edge containing an abrasive material; supporting the glass article so that its inside edge is in proximity to the beveled edge of the plate; and establishing contact between the glass article and the abrasive material. An orbital, undulatory motion is induced between the bevel plate and the glass article to abrade at least a portion of the inside edge of the glass article. An apparatus for practicing the method is also described and may be used for uniformly beveling the inside edge of CRT funnels and faceplate panels.

Abstract: Codeposited noble metal/base metal cathode elements provide electrolytic capacitors with high volumetric efficiencies. The requisite codeposition is obtained by electrodeposition of the metals onto the interior surface of capacitor cases from solutions of the metal salts.

Abstract: A television receiver includes a kinescope spot burn protection circuit comprising a capacitor coupled between a source of blanking signal and a control grid of the kinescope for applying negative grid cut-off bias to the kinescope in response to the blanking signal. The amplifier is of the cascode type having a minimum output voltage for peak white levels of a video signal applied to the cathode. The protection circuit includes a potential divider for biasing the kinescope at a positive voltage level related to the minimum output voltage of the amplifier during normal operation of the receiver to maximize the brightness of displayed images.

Abstract: A circuit for receiving a video signal with a horizontal synchronizing component at a horizontal scanning frequency generates an intermediate synchronizing signal synchronized with the horizontal synchronizing component. A horizontal deflection circuit generates horizontal deflection current synchronized with the intermediate synchronizing signal. An oscillator generates a display locked clock signal synchronously with a clock synchronizing signal derived from the horizontal deflection current. A counter divides the clock signal, producing decodable outputs. A decoding circuit generates display locked timing signals, at the frequency of the horizontal synchronizing component and at the frequency of the intermediate signal, from the outputs of the counter.

Abstract: A horizontal deflection system comprises a horizontal deflection yoke and a resonant retrace circuit coupled to the yoke and to a switched energy source for generating a horizontal deflection current in the yoke. A diode modulator is coupled to the resonant retrace circuit. A control circuit operable in a switched mode supplies a control signal to the diode modulator for modifying the deflection current to correct for side pincushion distortion. A transformer has a first winding coupled to the diode modulator and to the control circuit for recovering energy from the diode modulator. The transformer has a second winding for receiving the recovered energy from the first winding. A diode clamp is coupled to the second winding and to a load driven by a voltage source at a first voltage level, for transferring the recovered energy from the second winding to the load.

Abstract: A dual input universal logic structure allows many logical functions to be implemented using a relatively small number of CMOS transistors. The dual input structure implements the following logical equation:OUT=A+BorOUT=A.multidot.B.The dual input universal logic structure comprises a p-channel field-effect transistor (FET) and an N-channel field-effect transistor. A multiplexer circuit and an exclusive NOR circuit which each require only four CMOS transistors may be implemented using the dual input logic structure. likewise, a two-by-four decoder may be implemented using only ten CMOS transistors. Since a fewer number of CMOS transistors are required to implement certain functions, the space requirements of the circuits are reduced and denser circuit packaging may be achieved in VLSI integrated circuits. In addition, the dual input logic structure may be used within a random access memory circuit to decrease power consumption and soft error rate.

Abstract: A shrink fit implosion protection band for a CRT having rounded corners is stretched along the diagonals by 1.0% to 1.5% to form necked down areas in the band.