Abstract: An impulse activated switch having a controlled time-delayed self-restoration from its complementary state to its initial state is described. Upon illumination, a photodiode array connected to the gate and source electrodes of a field effect transistor produces a voltage which changes the current conduction state of the field effect transistor to its complementary state and charges a capacitance. The capacitance forms part of an RC timing network which controls the time required for self-restoration. The switch may be normally on or off and unilateral or bilateral.

Abstract: Apparatus (10) is disclosed for mounting a reel (40) having a material (41) wound thereon. The apparatus includes a rigid support member (20) and a first projection (21) extending generally perpendicularly from the support member for holding the reel. Extending outwardly from the support member is a second projection (22) which is spaced apart from the first projection. Fastened to this second projection and coupled about an edge of the reel of the first projection are means (60, 61, 62, 63, 64, 65) for providing a braking action to the reel as material is drawn therefrom.

Abstract: A circuit is provided in which the output current is the inverse, that is, the reciprocal, of the input current.The circuit comprises an input current branch and an output current branch, each branch including the emitter-collector electrodes of one of matching transistors, and a reference current branch containing a pair of serially connected, like poled, diode-connected transistors. The base electrode of the input branch transistor is connected to a node in the reference branch on one side of both diode-connected transistors, and the emitter of the output branch transistor is connected to a node in the reference branch on the other side of both diode-connected transistors. The base of the output branch transistor is connected to a node in the input branch on the emitter side of the input branch transistor.The circuit thus represents sums and differences of various voltages across the PN junctions in the several branches.

Abstract: A line circuit is disclosed for controlling communications over a communication pair between a switching machine and a key telephone station. The line circuit includes a dual sensitivity shunt detector arrangement (103, 104, 105) for improved detection of dc transients and ac ringing voltage signals appearing across the pair. A current diverter circuit (104) switches the sensitivity of the shunt detector arrangement depending on the operating state of the key telephone station.

Abstract: A solid-state protector circuit utilizes the combination of two zener diodes (Z1, Z2), a resistor (R1), a capacitor (C1), and a gated diode switch (GDS) to facilitate the rapid discharge of high voltage transients.

Abstract: Apparatus for mounting a circuit module on a circuit board. The mounting apparatus comprises an insulating base member (10,20) mounting electrical conducting members (102,202) each having a portion (1020,2022) positioned in a plane along side of and parallel to an edge of the base member for contacting a circuit module terminal. A spring housing member (11,21) having a pair of inwardly formed side walls (110,2,10) is provided to spring clamp the circuit module onto the base member and maintain each circuit module terminal in electrical engagement with the contacting surface of a corresponding one of the base mounted conducting members.

Abstract: An all solid-state protector circuit utilizes the combination of four zener diodes (Z1, Z2, Z3, Z4), two resistors (R1, R2), two capacitors (C1, C2), and two gated diode type switches (GDSA, GDSB) and provides bilateral voltage surge protection.

Abstract: The subject sampling filter employs fractional period displacement of samples to force additional nulls in the filter characteristic response. This sampling method and cascading antialiasing filters provides a filter structure which minimizes the complexity of the circuit yet which provides great flexibility to implement a desired filter characteristic.

Abstract: A time division switching system having distributed control processors is disclosed. The distributed processors exchange control messages and cooperate in the completion of talking paths between subscribers. Each control message includes an address portion defining the destination for the control message and is transmitted to a time-shared space division switch on the same time multiplex lines that speech representations are transmitted. Control messages are routed by the time-shared space division switch to a control distribution unit where the address portion is interpreted. When the address portion defines a distributed processor which controls the time-shared space division switch, the control distribution unit transmits the associated control message directly to that processor. Alternatively, when the address portion defines one of the other distributed processors the control distribution unit transmits the associated control message to the defined processor via the time-shared space division switch.

Abstract: Improved input offset voltage compensation of an amplifier (12) is achieved through the use of a servo loop which is added to electronic switch and capacitor offset compensation circuitry disposed in the input (14) and feedback (20) paths of the amplifier. A voltage approximately equal to the offset voltage is stored on a feedback capacitor (24) by operation of input reset (34), feedback shunt (22) and feedback reset (26) switches. An error correction voltage is then generated within the servo loop (40) to adjust for the residual offset produced by the operation of the input reset and feedback shunt switches as well as the finite gain of the amplifier.

Abstract: Electrical relay apparatus in which a contact spring (35) is bowed rather than angularly flexed by the armature (16) to bring the contacts (28, 38, 34, 39) into or out of engagement. A first contact (38) is mounted at the crown of a slightly bowed spring (35) fixedly mounted at one end. The contact (38) is mounted at near the midpoint of the spring (35) spaced apart from a second, fixed contact (28) and the contacts (28, 38) are brought into engagement by the further bowing of the spring (35) by an armature (16) acting along the spring axis in the direction of its fixed end. A second contact (39) mounted on the underside of the spring (35) may be brought out of engagement with a second fixed contact (34) by the further bowing of the spring (35) for a break-before-make mode of operation.

Abstract: A connector assembly (10) has been developed with an aligning coupler (300) and connectors (100, 200) which simplify the joining of a pair of mateable optical fiber termination structures (112, 212). The coupler (300) comprises a pair of rigid elongated members (310, 340) having inner surfaces (312, 342) and tapering outer end surfaces (328, 358). Resilient members (370) hold the elongated members together to define a fiber termination structure receiving orifice (380) which has a cross section normally narrower in one dimension than that of the termination structures. Due to the resilient members, the elongated members can separate to ease insertion of the termination structures and then come back together to urge precise-aligning outer surface means (122, 222) on each termination structure into registration against a precisealigning coupler reference surface (332) in the orifice. Thus registration is maintained until the connector assembly can be fastened.

Abstract: Bandstop (FIGS. 1-3) and bandpass (FIGS. 4, 5) filters are presented utilizing broad and narrow wall resonator coupling in a rectangular waveguide (11 and 37) at a common cross sectional reference plane. For the bandstop filter, the resonators (12, 13) are resonant at a common frequency f.sub.0 to provide a two-pole bandstop response in a filter of minimal longitudinal dimensions. For the compact bandpass filter, each tone rejection is provided by a pair of resonators (31, 35) coupling to the electromagnetic field signal at two points one from a broad wall and the other from a narrow wall of the waveguide (37) but displaced by some multiple of a half wavelength. Another pair of resonators (33, 34) are in common cross sectional plane relationship to the first pair but located on a wall of different width to provide rejection of a tone at the other end of the passband. The use of resonators with different resonant frequencies at a common cross sectional plane avoids possible interresonator coupling.

Abstract: A method is described for increasing the spatial frequency of surface relief structures. Periods as small as 750 Angstroms have been made.

Abstract: A fabrication process for making palladium-plated target anodes for X-ray lithographic systems is characterized by a unique sequence of surface preparation, plating and annealing steps. Anodes made by the process have been operated reliably at high-power levels for extended periods of time.

Abstract: The present invention relates to an adaptive interference suppression arrangement. In the present arrangement, a main antenna (10) picks up the desired signal and some interfering signal and a small auxiliary antenna (20) is pointed in the direction of the interfering source and picks up a sample of the interfering signal. The interfering sample is then put through a quadrature modulator (24) for adjustment of its phase and amplitude to provide an estimated cancellation signal at the output. This estimated cancellation signal is then combined with the main antenna output to give a corrected signal. After down-converting, the present system detects the power in the corrected signal and a processor (32), in response to such power detection, generates a small dither signal which is added to the control signals to vary the phase and amplitude in the quadrature modulator of the residual interference in the corrected signal.

Abstract: A CMOS integrated circuit structure having an improved guardband configuration for the prevention of parasitic SCR latchup. Included with each guardband is a pair of field reducing surface regions of the opposite conductivity type to that of the guardband and situated one on each side of the guardband adjacent thereto. The field reducing regions which are electrically connected to each other serve to reduce any electric fields in the bulk region underlying the guardband thereby significantly improving the effectiveness of the guardband for collecting minority carriers in the bulk region to provide greater protection from latchup.

Abstract: An improved ringing control circuit in a stored program telephone switching system which provides a called subscriber an interval or window of time after answering a call to send a request for special services such as identification of the number of the calling party. This time interval, initiated when ringing is tripped, delays operation of current sensitive devices which sense current flow in the subscriber line when the party answers the call. This delays completion of the connection by the systems processor which periodically scans the conditions of the current sensitive devices. A detecting device is also provided in the control circuit to detect receipt of the request for service signal during the time interval.

Abstract: The present invention relates to a spread spectrum, FH-MFSK radio receiver capable of demodulating and decoding one or more concurrently received L-length frequency-hopping, Q level frequency shift keyed signals to determine the correct signal of a particular user. In operation, the receiver spectrum analyzes the received signal to determine which frequency components are present during each of the L chip intervals and then demodulates a particular user's L-length FH address signal with the derived frequency components to arrive at a Q by L-length detection matrix. A detector and checking processor determines which L-length matrix rows have a maximum number of entries and if only one such row exists, that level is deemed the correct message level. Where multiple maximum-length rows are found the processor uses the address sequences of all other users to check if the row entries could have been caused by interference. The row with the minimum matches is deemed the correct message level.

Abstract: Disclosed is a method for making an electrical cable (10) which includes a plurality of insulated conductors (11) bound together in close proximity to one another to form a cablecore. A sheet of insulative material (13) surrounds this cable core and this assembly in turn is further surrounded with a conductive shield (14). An insulative sheath (16) surrounds the entire assembly. Integral with the conductive shield are means (15) for providing shield continuity when the insulative sheath and conductive shield are entered.