Abstract: A miniature current transformer is equipped with a primary winding insert formed as a stamped metal piece with elongate legs and a flange portion disposed at 90 degrees to the legs. The top of the flange is unobstructed by other structural details, and is wide enough to be gripped by vacuum pick-and-place equipment. At the same time the insert is electrically functional as the transformer's primary winding. The flange rests on surfaces formed in the transformer bobbin. The insert legs are mounted through passages n the bobbin leading out to the bobbin's bottom side. The legs are formed into gull-wing ends that have a dual role as lock tabs to secure the insert on the bobbin, and as the primary leads.

Abstract: This disclosure describes a precision optical fiber connection system buildable with a minimum of precision-made components. Sets of fibers to be mated are contained in V-grooves in respective opposing silicon-etched fiber holders. A lense-sphere is fixedly deployed in the groove next to the end of each fiber. An initial gross positioning of the lense-spheres of the upper fiber holders with respect to their receiving grooves in the lower fiber holder, is achieved by using a cylinder disposed adjacent to the fiber grooves. Tapered sides of the upper holders engage the cylinder to funnel the lense-sphere into their receiving grooves. Also disclosed is a three-point support system for assuring that the opposing fiber groove surfaces remain parallel and do not experience relative rotation.

Abstract: A limiter/clamp circuit is described having a sharp bend in the clamp characeristic and a transition from its linear range to its clamp range that occurs over a desirably small voltage range. The sharp bend is achieved by a feedback loop consisting of plural transistor elements configured in a current "mirror" feedback structure. This circuit is based on achieving an exponential/logarithmic dependence of the voltages and currents in the feedback loop, which serve to control the feedback signal to the base of a 2-transistor clamping device. The circuitry also provides relatively symmetric clamping.

Abstract: An improved machine process for recognizing the transition point between letters and digits in handwritten text is disclosed. The script, digits and/or letters, is mapped onto a pixel matrix. The entropy for each column for a range of assumed slant angles is analyzed to determine the angle at which image entropy is a minimum. By reverse-shifting the pixel array an amount equal to this angle, the slant component of the script is verticalized and the segmentation step which follows is more accurately accomplished.

Abstract: Buried ocean cable is irradiated with a suitable sonar signal, and in response emits distinct characteristic "signature" backscatter signals. The "signature" signals are distinct for specific individual constructions of cable, and therefore assist in determining the identity of a buried object without having to dig it up. Search apparatus launches the unique sonar signal toward the buried cable, with a predetermined beamwidth, attack angle, cross-section, and signal character. The signal consists of a succession of bursts of different frequencies, separated by a step function, for example, and separated by silent periods. The signal is repeated as the search vehicle travels a predetermined direction with respect to the estimated cable orientation. The backscatter signals are received by the sonar apparatus for analysis by digital comparison to a data library of known signal patterns, or for display on an operator's monitor.

Abstract: A line powered voltage regulator for producing a regulated voltage from the tip and ring terminals of a telephone line for low-powered circuit applications provides a high a-c impedance, low-current drain, and a very low temperature coefficient over a broad temperature range. The regulator utilizes a voltage sensor having matched transistors formed on a bipolar chip and IGFET elements formed on an IGFET chip for starting the regulator. The voltage sensor has high gain for providing a large control voltage for small changes in the load and for eliminating the effects that aging and temperature of the elements of the regulator might have on the regulation.

Abstract: In-service PIC telephone cable that has become water-logged in places is reclaimed dielectrically by pumping in an aromatic solvent oil containing cross-linking agents that will gel the oil in a predetermined period preferably of the order 24 hours. A nongelling prepurgent miscible with both water and aromatic solvent oil may be pumped in before the gelling compound is introduced, to more completely purge the water.

Abstract: Positioning a magnetic tape cartridge with respect to a stationary capstan drive is achieved with great accuracy in this invention by simple overcenter loading cams which bias the cartridge horizontally against the capstan drive, as well as vertically against reference surfaces. The cartridge is thus reliably positioned with precision in the tape recorder.

Abstract: A connector for a main distributing frame comprises two spaced apart panels with the first panel having pluggable electrical protector sockets and test points mounted therein flush with the outside face. The test points and the outside plant ones of the protector sockets have pin terminals extending therefrom into the space between the two panels. The central office ones of the protector sockets have pin terminals extending therefrom through the second panel to present wire wrappable ends at the outside of the second panel. Connections of outside plant conductors to the test point terminals and connections from these terminals to the protector sockets are protected in the space between the panels. If desired, the test point terminals can be prewired to cable-connectors mounted on the first panel which are adapted to receive mating connectorized outside plant stub cables. A slideable cover mounts over the wire wrappable ends at the outside of the second panel to provide protection thereto.

Abstract: A solderless electrical connector is disclosed having the capability of connecting a plurality of insulated wires. The connector includes a metallic contact having a plurality of keyhole-shaped slots. As the wire is inserted, the mouths and associated shoulders of these slots pierce and strip the insulation from the conductor. As the wire is forced further into the keyhole slot, the inner walls of the slot are caused to bear into the surface of the conductor. The connector further includes a means for positioning and retaining the wires to be interconnected, a means for enclosing the connection, and a means for protecting the connection from torsional and tensional stresses.

Abstract: An echo suppressor for full duplex telephone circuits consists of a filter bank of contiguous band filters in the transmission path, with each filter output feeding a separate center clipper. Each clipping level is controlled by echo signal amplitude as attenuated by the trans-hybrid loss that occurs in the corresponding subband. The scheme permits "double-talking" while suppressing the echo component.