Abstract: A digitized phase modulating system in which a clock pulse signal of frequency C.sub.a is divided by a counter of count capacity N, which when N=4, produces four signals having phases spaced at intervals of 0.degree., 90.degree., 180.degree. and 270.degree.. Signal selecting logic means including counting means is responsive to data clock pulses of frequency mf.sub.s (where m is an integer) and to the binary contents of successive states of a binary modulation sequence of bit rate f.sub.s to successively select various ones of said four signals whose successive phases are indicative of the contents of said successive states of said binary modulation sequence.

Abstract: Method and circuit for controlling the color of dot elements in a raster scan display having a data memory for storing the state (on or off) of dot elements which are mapped onto the raster scan display and a smaller auxiliary memory for storing color information. The color information stored in a location of the auxiliary memory specifies the color of a plurality of contiguous dot elements so that the auxiliary memory can be much smaller than the data memory. The contiguous dot elements whose color is specified by a location in the auxiliary memory form a block which can be arranged so that the address bits to the auxiliary memory form a proper subset of the address bits to the data memory.

Abstract: A frequency synthesizer including a phase lock loop comprising a voltage controlled oscillator, a four phase modulator for modulating the oscillator output signal, a phase detector for comparing the phases of a reference signal and the output signal of the modulator and filter means for supplying the phase detector output signal back to the oscillator. The two most significant bits of an arithmetic synthesizer are supplied to the modulator to produce, in the absence of additional modulating signals, discrete increments of 90.degree. phase shift in the oscillator output signal. To eliminate phase jitter, the remaining lower order bit positions of the arithmetic synthesizer are converted to analog voltages which are supplied into the phase lock loop to effect a gradual phase shift between the otherwise discrete 90.degree. phase shifts. Continuous phase, constant amplitude output signal is thereby produced having a frequency translated by the phase shifts introduced by the arithmetic synthesizer.

Abstract: A digitalized phase modulating means in which a two level binary modulated sequence from a data source of bit rate f.sub.s is supplied to a pulse add/delete circuit. Also supplied to such pulse add/delete circuit is a train of clock pulses of frequency C.sub.a, and a train of add/delete pulses having a repetition rate mkf.sub.s, where m and k are integers. The pulse add/delete circuit responds to a binary bit of value 1 or 0 to add or delete the said add/delete pulses to the train of clock pulses at a given rate, such as mk pulses per data bit period 1/f.sub.s. The altered clock pulse train is then supplied to a divider which divides by 4k to produce a cyclical output whose phase is advanced or retarded by 1/4k of 360.degree. each time a pulse is added or deleted from the clock pulse train C.sub.a.

Abstract: Apparatus and method for sampling analog signals during successive time periods, the sampling signals being essentially aperiodic. The interval between sampling pulses is selected pseudo-randomly. A circuit for producing essentially aperiodic sampling signals gates a periodic signal through a number of delay means, each having a delay time that is a small fraction of each period, the number of delay means being selected by pseudo-random signals. Periodicity of quantization errors is broken up, thereby reducing concomitant unwanted harmonics of the sampling frequency that are introduced when the sampling signals occur at equal time intervals.

Abstract: Circular correlator/convolver for discrete sample signals having a first shift register to receive the sample signals in series and a second shift register to receive the sample signals, in parallel, from the first register to circulate these signals in the second register, and once each shfit period, to apply the n signals it is storing to a group of n multipliers, Each multiplier receives also a second signal which serves as a second operand and is multiplied with the signal received from the second shift register. The correlated/convolved values are produced in response to the product signals generated by the multipliers during the time a following group of sample signals is being read into the first shift register. The design is suitable for implementing with charge-coupled devices on a single substrate.

Abstract: P-point transform analyzer using M N-point serial transform devices in parallel, the output signals therefrom being combined in K J-point serial transform devices in parallel, where M, N, K, and J are integers other than one such that M.times.N=K.times.J=P. Serial input signals are converted to M parallel sets of signals which are coupled to the N-point transform devices for processing in subgroups. The subgroups of output signals are combined into the proper order by switching the output signals from the N-point devices to the J-point devices after suitable delays and phase shifting.

Abstract: Circuit for controlling the color of dot elements in a raster scan display. A data memory stores the state (on or off) of dot elements which are mapped onto the raster scan display. At least one smaller auxiliary memory is provided to store one set of color information specifying the color of a plurality of contiguous dot elements when the dot states have one value and another set of color information specifying the color of the plurality of contiguous dot elements when the dot states have the other value. There is also a selectable background color circuit for controlling the color outside an active display area.

Abstract: Circuit for producing an output threshold voltage having a given relation to noise signals. The threshold crossings of a noise signal and a reference signal are processed by a circuit including a digital integrator to produce the threshold voltage level that maintains a constant rate of noise threshold crossings.

Abstract: A tool set for installing and removing individual connector pins mounted in an electrical circuit board and the like and within a connector housing wherein the pin to be removed or installed is part of a row of pin pairs enclosed within a housing. A pin is installed and/or removed with the present tools without housing removal or disturbing of other pins within the housing, regardless of the type of pin damage encountered. There is also a tool for inserting tie pins in a circuit board in aligned relationship.

Abstract: A loose piece feeder comprising a slotted, inclined track extending down at an angle .alpha. from a cylindrically-shaped reservoir holding small terminals or pieces to an applicator station. The slotted track enters the reservoir through a window in the bottom of the side wall thereof and extends across the cylinder bottom along a chord line thereof which lies below the axis of the tilted reservoir. A brush oscillates back and forth across the track slot within the reservoir and, when moving away from said window, tends to brush away improperly seated connectors, and, when moving towards said window, tends to properly seat said connectors in said track slot and to push said properly seated connectors out of said window and down said inclined track towards said work station, aided by vibrating the entire system.

Abstract: An assembly line method for fabricating hermetically sealed integrated circuit chips with externally extending terminal leads comprising the steps of securing at least one integrated circuit chip upon a spider assembly; stamping a strip of iterative lead frame assemblies from a strip of flat stock metal; encapsulating each of said lead frame assemblies with plastic in a configuration which leaves a window space in the center thereof or defined elsewhere therein, with the convergent ends of the individual conductive paths of the lead frame extending out of the plastic and into said window space, and the divergent ends of such conductive paths extending out of the plastic and away from the window space; mounting the terminal chip holding spider assembly onto the convergent ends of the conductive paths of the lead frame; inserting a first cap over the window space on one side of the encapsulating plastic; filling the window space with a sealant to completely immerse said spider bearing chip therein and having th

Abstract: A rotatable wheel has cavities formed in the perimeter thereof. Movable coring pins are also mounted on the wheel perimeter and have cam track follower means which ride in stationary cam tracks positioned adjacent the wheel and which move the coring pins in and out of said cavities as said wheel rotates. An extruding means has a nozzle positioned adjacent the wheel perimeter and forces molten plastic into the cavities as they pass thereby with the coring pins inserted therein. The configuration of, and spacing between, the wheel perimeter and the nozzle produces plastic links between the plastic products formed in the cavities to provide a continuous strip of such parts secured to a common carrier, which strip can be wound upon a take-up reel directly from the wheel. Alternatively, movable coring pins positioned radially with respect to said wheel, or at other angles, can be moved in and out of the cavities as the wheel rotates.

Abstract: A printed circuit board connector is comprised of an elongated rectangular housing having a passageway in a longitudinal edge thereof for insertion of the board. A thin plate lever lying along the outer surface of each side wall of the housing and rockably mounted thereon, is provided at its free end with openings to capture the free ends of resilient contact members supported within the housing for retracting them against their bias from the path of a circuit board inserted in the passageway. A thin slidable cam plate between each of the side walls and plate levers cooperates with projections on the walls for causing them to move outward for pulling the contacts away from the passageway. A feature of the invention is that the housing and plate levers are all injection molded in one piece, and the levers are broken off the housing and rockably mounted thereon.

Abstract: A circuit board connector having a plurality of pairs of contacts arranged in a row and with each contact having a "C" shaped portion. Each pair of contacts is mounted securely at first ends thereof in a circuit board with the backs, or closed sides, of the "C" shaped portion facing each other and designed to receive the edge of a second circuit board inserted therebetween. The free end of each contact has an ear-like element extending outwardly from the board to which the contacts are secured. A connector housing fits over the pairs of contacts after they have been secured in the board. Inside the housing tabs are provided, behind which tabs the ears of the contacts are positioned, thereby prestressing each pair of contacts apart. The housing is also designed so that the side walls thereof press against a dimple or finger-like tang formed near the base of each contact, thereby forcing the contacts of each pair of contacts together and further enhancing the prestressing of each pair of contacts.

Abstract: An eyelet-shaped type connector for connecting together opposite sides of a printed circuit board and having a first end section of a generally cylindrical shape extending out of one side of a hole in a printed circuit board and a second end section of a generally cylindrical shape extending out of the other side of the printed circuit board. A plurality of legs, bowed towards each other, connect the two end sections together. Because the legs are bowed inwardly they will give and become more bowed as the extended first and second ends are soldered to conductive areas around the holes in the printed circuit board and the board contracts after the solder has cooled, thereby eliminating cracking of the solder joints. The inside surfaces of the connector are coated with a soldering repellant material such as chromium and the outside surfaces with a solder attracting coating such as tin.

Abstract: A card edge connector in which a plurality of conductors are terminated rapidly and simultaneously with a single, downward thrust of the conductors into the connector. A plurality of contacts are retained in the connector housing in a side-by-side, parallel relation. Each contact has a U-shaped portion opened at the trough of the U and with slots extending down in both legs of the U. A third slot, unique to each contact, exists in a vertically positioned panel of the housing. These three slots are aligned so that a conductor can be forced therein with a single, downward thrust of the conductor. The sides of one of the slots in the U is narrow and cuts through the conductor insulation and into the wire to make an electrical contact. The other slot in the U cuts into the insulation but not into the wire, thereby providing strain relief in two dimensions. The slot in the housing panel traps the conductor therein to provide strain relief in the third dimension.

Abstract: A series of socket assemblies is fabricated of a single strip of flexible material having socket interconnection necks enabling selective separation of adjacent socket assemblies. Each assembly includes a plurality of component-lead receiving sockets in an appropriate configuration inserted into holes in the flexible strip to be insertable into corresponding holes of a printed circuit board. The assembly also has partially formed holes to ride upon the printed circuit board to provide a socket standoff thereform.The socket assemblies are insertable as a unit, or individually, as desired, and allow reduction in the manufacturing tolerances of the positional and axial alignment of the socket receiving holes of the printed circuit board.

Abstract: The disclosure relates to a tool for installing and removing a housing which is positioned over a row of connector pairs and frictionally engaged with the rows of connector pairs, there being no integral connection between the housing and the contacts. The tool is designed to remove the housing when positioned over the contact members by utilizing a wedge on the tool which separates the contact members so that the housing can be pulled up over the contact members without rubbing thereagainst to remove any plating layers thereon. The housing is installed by the same tool wherein the housing is gripped and, upon insertion of the housing over the contact members, the wedge first spreads the contact members apart and the housing is disposed thereover without rubbing against the contact members. In the case of installation and removal of the housing member, the wedge is designed to push the contacts sufficiently far back so that they do not rest upon a preloading bar disposed within the housing.

Abstract: A first half of a two piece connector housing has a plurality of parallel tubular elements extending from a common backing and defining a plurality of first cavities, each containing a hermaphroditic contact. The second half of the housing has a grid-like network of partitioning walls which define a plurality of second cavities and which fit in-between the tubular members of the first half. Each second cavity also contains one of said hermaphroditic contacts which mates with an aligned hermaphroditic contact in a cavity in the first housing half. Each contact has a trough-like element and a pair of leaf-like spring elements mounted thereon. Two such contacts will mate when inverted with respect to each other, with the leaf-like elements of one contact mating with the inner surfaces of the trough-like elements of the other contact to provide four separate areas of electrical conduction.