Abstract: A balanced L-section low-pass common mode filter is connected in series with balanced data I/O lines to remove common mode signals from balanced line difference mode signals. The filter includes input and output series transformers configured so that the magnetic fields in the transformers are subtractive for out-of-phase difference mode signals and additive for in-phase common mode signals and a shunt transformer coupled to ground configured so that the magnetic fields in the transformer are additive for out-of-phase difference mode signals and subtractive for in-phase common mode signals. Accordingly, the difference mode signals are not attenuated and common mode signals react to a short circuit to ground and are thereby attenuated by the filter.

Abstract: In a high-pass filter circuit comprising a high-pass filter having a transfer function in accordance with the following equation: ##EQU1## a compensation network is connected in series with said high-pass filter, said network comprising a summing circuit, a continuous line and a low-pass filter connected in parallel therewith, said low-pass filter having a transfer function in accordance with the following equation ##EQU2## and the filter coefficient d.sub.K-1 of the low-pass filter being chosen to be equal to the difference of the filter coefficients b.sub.n-1 -a.sub.n-1 of said high-pass filter.

Abstract: A balanced T-section low-pass common mode filter is connected in series with balanced data I/O lines to remove common mode signals from balanced line difference mode signals. The filter includes input and output series transformers configured so that the magnetic fields in the transformers are subtractive for out-of-phase difference mode signals and additive for in-phase common mode signals and a shunt transformer coupled to ground configured so that the magnetic fields in the transformer are additive for out-of-phase difference mode signals and subtractive for in-phase common mode signals. Accordingly, the difference mode signals are not attenuated and common mode signals react to a short circuit to ground and are thereby attenuated by the filter.

Abstract: A combination of passive electrical filters and active electrical filters in a series arrangement forming active passive band pass or high pass or low pass or band reject filters. The preferred embodiment includes an amplifier stage to include high input impedance. These filter combinations are free of internal electrical noise.

Abstract: A waveform corrector for providing correction to three-phase electrical power to correct for transient and harmonic distortion arising from electrical power cable reactance wherein the cable head end voltage and current are sensed without load end voltage or current sensing. Phase and neutral current values are sensed and corrected with predetermined values of cable resistance and inductance to provide a corrected sine wave voltage at the load end of the cable achieved by inserting a dynamic correction voltage in series with the electrical output of the waveform corrector.

Abstract: A low pass filter system for filtering from an electrical circuit unwanted high frequency signals while allowing passage to a passband of wanted signals of lower frequency wherein the filter system comprises a low pass filter (1) and a group delay equalizer made up of at least two group delay means (2,3) each of which imparts delay to substantially all of the passband signals. It has been found that by sharing the group delay function between two or more group delay means enables a much higher degree of group delay equalization to be achieved with filters having a transition sharpness of below 1.17.

Abstract: An integrated low-pass filter arrangement comprising one or more resistor sections coupled between the input terminals and the output terminals and a capacitor section coupled between the output terminals. Each resistor section comprises two diodes arranged in anti-parallel. The impedance connected to the output and the amplitude of the input alternating voltage are selected in such a way that the threshold voltage of the anti-parallel diodes is not exceeded. If the direction and magnitude of the leakage currents through the diodes are known the instantaneously non-conducting diode of the anti-parallel diode array may be omitted.

Abstract: A combined RFI filter and low pass filter includes two sections, both of which serve as both radio frequency interference filters and low pass filters, or dc integrators. Both sections have substantially equal time constants and employ non-polarized capacitors.

Abstract: Filter equipment for power lines has a double-tuned shunt filter (F1) which has a series resonance circuit (C1, L1) connected in series with a parallel resonance circuit (C2, L2). The capacitor banks of the two resonance circuits are formed so as to have opposite signs on the temperature coefficent of the capacitor capacitance.

Abstract: A high frequency filter for an electric instrument including a casing of metallic conductive material, an internal electric circuit element arranged within the casing, and a connector mounted on a peripheral wall of the casing for connecting the internal electric circuit element to an external electric circuit. The high frequency filter comprises an insulation substance layer arranged between the connector and a connection terminal of the circuit element, the insulation substance layer being made of a dielectric material whose dielectric constant decreases or increases in accordance with increase or decrease of wireless frequency applied thereto, and a pair of conductive layers formed on opposite surfaces of the insulation substance layer, one of the conductive layers being connected at one end thereof to the connector and at the other end thereof to the connection terminal of the circuit element, and the other conductive layer being connected to a portion of the casing.

Abstract: In a high frequency interference suppression filter for a circuit to be connected to a conductor, particularly two-wire sensors having at least one inductor in series with the circuit to be protected from interference and having at least one capacitor parallel to this circuit, an ohmic series resistor is provided which is matched to the characteristic impedance of the conductor.

Abstract: Asymmetric polyphase filer having first to fourth input terminals for applying thereto a 4-phase input signal including first to fourth signal vectors, respectively, which succeed one another in phase each time through 90.degree., first to fourth intercoupled identical filter sections, respectively, connected to the terminals, at least one of the odd and even filter sections being coupled to two output terminals, said filter sections having constant reactances.

Abstract: An LC composite component comprises a laminated structure which is formed by stacking first and second inductor layers while holding a capacitor layer between the same. The first and second inductor layers comprise magnetic members and conductor lines formed inside the magnetic members respectively. The capacitor layer comprises a dielectric member and first and second internal electrodes which are provided within the dielectric member to be opposite to each other. First and second external electrodes are provided on first and second opposite end surfaces of the laminated structure, while a third external electrode is formed on at least one of first and second opposite side surfaces. First ends of the conductor lines provided in the first and second inductor layers are connected to the first and second external electrodes respectively, while second ends of the conductor lines are electrically connected with each other through the second internal electrode provided in the capacitor layer.

Abstract: A conversion adapter including noise filters for eliminating high frequency noise yet having a simple wiring arrangement. The conversion adapter of the invention has two connectors supported on an adapter frame body and spaced opposite to each other and at a different configuration with respect to each other, a small-sized printed circuit board disposed between the two connectors, a plurality of 3-terminal noise filters arrayed in a row on the central portion of the printed board, and board-in connectors for connecting wires led from the connectors to both sides of the noise filters arranged on the circuit board. Assembly is greatly simplified since the wires from the connectors may be connected to the terminals of the board-in connectors prior to final assembly.

Abstract: Multi-dimensional digital filters have such a circuit structure that their transfer function corresponds to that of an antimetrical filter, and have a characteristic function that is a rational function of the squares of the equivalent complex frequencies. Multi-dimensional filters, wave digital filters as well, can thereby be realized having a closed attenuation behavior.

Abstract: A high-pass element of a filter assembly for a line connected to static converters having a high voltage level for filtering harmonics and damping resonance sites includes a first series circuit including a first capacitor, a first choke coil, and a second choke coil. A resistor is connected in parallel with the choke coils. A second series circuit is connected directly in parallel with the second choke coil. The second series circuit includes a second capacitor and a damping resistor. On the other hand, the second capacitor and the damping resistor may be in parallel with the second choke coil and at least one other series circuit may be connected in parallel with the second choke coil. The at least one other series circuit includes a series capacitor and a series resistor.

Abstract: A magnetic article surveillance system utilizing microcomputer control and unique time domain and frequency domain information gathering channels whose information is processed by the microcomputer via preselected time domain and frequency domain criteria.

Abstract: A trap filter assembly of the type employed with a video cable system to block a particular band of video frequencies has a housing formed as a generally rectangular block of square cross-section, made of cast aluminum or other suitable material. A cavity formed in the housing has first and second compartments which are separated from one another by a pair of barrier walls that define therebetween a channel passageway that extends from one corner of the first cavity compartment to a laterally opposite corner of the second cavity compartment. This prevents any direct line of sight signal path for stray video signals between the first and second compartments. First and second printed circuit filter boards are mounted in the compartments, preferably by a threaded fastener which mounts the boards onto respective pedestals in the compartments. A bare-braid coax conductor passes through the channel between the barrier walls and unites the signal paths on the two boards in the respective compartments.

Abstract: A bandpass filter comprises a reactively intercoupled pair of parallel-resonant circuits (1, 2) to one of which a pair of signal input terminals (15, 16) are connected and to the other of which a pair of output terminals (17, 18) are connected. Tuning of the filter is accomplished by varying the capacitive component of each circuit by means of a tuning voltage applied to a further input (19). In order to compensate for the deviation from the optimum intercoupling which would otherwise occur with change of tuning frequency the capacitive component of each resonant circuit comprises at least three capacitors (5, 6, 7 and 8, 9, 10) in series, each set of three capacitors effectively forming a variable capacitive voltage divider. The two junction points of the three capacitors of each set are each connected to the corresponding junction point in the other set by means of a respective bidirectional reactive coupling (13 and 14 respectively).

Abstract: An in-line filtering device for a telecommunications line having an insulation displacement connection member located within a channel formed in a dielectric housing. The connection member is devoid of a wire terminal. A ground line is connected to the connector member, the ground line including a radio frequency filter. The channel is open-ended at both ends to allow an insulated conductor wire to pass, without a break in the wire, completely along the channel and out from both ends with the conductor wire electrically connected to the insulation displacement connection member.

Abstract: Electrical circuit component assembly 28 of the present invention is comprised of three electrical circuit component members, 32, 40 and 41, respectively that are assembled such that first member 32 is in series and second and third members 40, 41 are in parallel with a signal, when assembly 28 is electrically connected between respective ends 64, 66 of discontinuous conductor 62 on circuit board 60. Electrical circuit component assembly 28 includes first member 32 having first and second electrically conductive portions 34, 38 at spaced locations along its body 36; second member 40 having first and second conductive areas 42, 46 at spaced locations on body member 44, and third member 41, having first and second conductive areas 43, 47 at spaced location thereon.

Abstract: A composite part and a method of manufacturing the same, comprising a plurality of pairs of terminal members formed in punched regions of a lead frame opposite to each other and shaped by cutting at predetermined positions a plurality of pairs of projection segments coupled at the respective base portions thereof; a plurality of circuit parts disposed and connected between the pairs of projection segments, and an armor molded in a region except the circuit parts and the base portions of the projection segments. The fore ends of the projection segments extending outward from the armor and formable into different shapes depending on the cut points are bent along the wall surfaces of the armor. Accordingly, there can be produced a composite part having any desired one of various functions by selectively changing the cut points of the projection segments. Since such selective change of the cut points can be achieved in the stage of use as well as that of manufacture, a remarkable advantage is attainable.

Abstract: The invention relates to a low-pass filter for limiting the frequency band of a luminance signal and for delaying said luminance signal, in particular intended for use in the recording channel of a video recording apparatus before the FM modulator. The luminance signal components above a cut-off frequency are attenuated by means of a ceramic filter (11, 31) which is connected to a point of constant potential (earth) and the luminance signal is delayed by means of a delay line (7, 35) arranged in the signal path.

Abstract: The filter comprises a series branch formed by an inductance coil (L) in parallel with a resistor (R1) and a parallel branch formed by a capacitor (C) in series with a resistor (Rc). For frequencies such that Rc>>1/.omega.C and R1<<.omega.L, the ratio between the output and input powers of the filter has a predetermined maximum value strictly lower than 1 and independent of the load impedance.

Abstract: A filter connector comprises a connector body which includes a conductive shell and an insulating insert provided in the conductive shell and having a plurality of through holes. First ends of upper first terminal pins are inserted in the through holes of the insert. Second ends of the first terminal pins pass out the back of the connector body. At least one of the plurality of terminal pins is adapted to support a printed circuit board. The printed circuit board has a conductive pattern which is electrically connected with at least one of the upper first terminal pins. A second terminal pin is electrically connected to the conductive pattern, whereby the second terminal pin is electrically connected with at least one of the first terminal pins. A plurality of filter elements are inserted in a current path between at least one of the first terminal pins and the second terminal pin.

Abstract: A high frequency filter assembly for an electric instrument including an internal electric circuit element arranged within a casing of metallic conductive material, and a connector mounted on a peripheral wall of the casing for connecting an external electric circuit to the internal electric circuit element. The filter assembly comprises at least a pair of overlapped insulation thin plates to be arranged between the connector and a connection terminal of the circuit element, and an earth electrode strip disposed between the insulation thin plates and being connected to a portion of the casing.

Abstract: A three terminal filter according to the present invention has a hot lead terminal provided with substantially U-shaped holding portions and a plate capacitor arranged between a pair of magnetic cores.

Abstract: A three-terminal type noise filter has a lead terminal of substantially U-like shape, two magnetic substance cores and a rectangular-plate-like-shaped capacitor which have surfaces which are parallel, the cores being inserted onto both legs of the lead terminal, the capacitor being disposed between the two magnetic substance cores, so that both the cores regulate movement of the capacitor, thereby improving positioning accuracy for the lead terminal and capacitor and raising the reliability of the filter characteristic. Also, one electrode of the capacitor and the head of the lead terminal are electrically connected with each other, a ground lead terminal connected to the other electrode of the capacitor is positioned between the two legs of the lead terminal, and the capacitor is disposed between the cores, thereby enabling the filter to be made small-sized as a whole.

Abstract: On an upper surface of a substrate (20) a band-pass filter (29) is provided, and on the opposite (lower) surface of a substrate (20) a low-pass filter comprising a conductive layer pattern (27) and capacitors (22,23) is provided, wherein a conductive layers (27) are provided on substantially the entire area of the upper surface excluding portions for terminals and on the lower surface excluding portions for the low-pass filter and the terminals, and by connecting both conductive layers by means of a row of through-hole connections, the input terminal (24) and the output terminal (25) are shielded from each other.

Abstract: A power filter resonant frequency modulation network for coupling between a load and a variable voltage direct current power source which is subjected to superposition of alternating current thereon at various frequencies and at various voltage levels, the filter including first and second series inductor arrangements in the positive and negative buses between the power supply and the load, with capacitive elements in parallel between the two buses. Each series inductor arrangement includes a first inductor in series with a frequency and voltage responsive inductive load device, which is a second inductor having a tertiary winding loaded with a coil wound about the core of a saturable reactor. The firing angles of the reactors are directly proportional to voltage and inversely proportional to voltage to provide a phase staggered change of inductance in the network.

Abstract: A broadband RFI power line filter in which emission filters designed for the 10 KHz to 30 MHz range are combined with high frequency filter elements so as to produce a filter in the 10 KHz to 1000 MHz range. The filter is divided into sections which are constructed in separate electrically isolated compartments so as to increase the attenuation which can be obtained with filters which are not separated from each other and electrically shielded compartments and the level of attenuation which must be achieved from each compartment is reduced in the invention.

Abstract: A ferrite sleeve or bead either in round configuration or square or rectangular configuration and either whole or split is employed as a means for reducing radiation emissions associated with a computer or the like data processing system. The ferrite system is disposed over the I/O cable either over a segment thereof or along the length thereof and in one embodiment is in the form of one or more ferrite beads that may be associated with wires internal to the data processing system. In a further embodiment of the invention the ferrite sleeve may be replaced by an equivalent circuit network comprising a parallel inductor and resistor in which the inductor is wound over a resistive core.

Abstract: A power line filter for 3-phase systems has a metallic filter housing which is subdivided by partitions into radio frequency sealed chambers. The chambers contain a power supply part, a first combination of feed through capacitors, attenuation elements, a second combination of feed through capacitors and a load connecting part. Phase conductors and a neutral conductor are connected through a respective annular feed through capacitor in the partition region from the power supply part to the first combination of feed through capacitors, and a similar connection is made between the second combination of feed through capacitors to the load connecting part. Phase feed through capacitors are provided per combination of feed through capacitors, and are accomodated in a feed through capacitor housing seated impact resistance in the filter housing.

Abstract: A comb-shape filter which comprises an ultrasonic delay device, a branch line adapted to apply a part of an input for the ultrasonic delay device to its output terminal without passing through the ultrasonic delay device and a band elimination filter provided in the branch line.

Abstract: For reducing the amount of circuitry and losses in double highpasses for filter arrangements in networks with a high voltage level, the two resonance frequencies and Q-factors of the double highpass are tuned so that in a critical harmonic range, at most a harmless slight resonance peak can occur, for which purpose a series capacitor together with a series choke are connected in series with a shunt circuit grounded, in the case of high voltage and ungrounded in the case of medium voltage, of ohmic, inductive and capacitive circuit elements connected to the network.

Abstract: A constant resistance loss/slope filter circuit has a plurality of cascaded circuit sections. Each circuit section has a fixed resistive pad and a slope equalizer. Each circuit section also has a switch for switching inputs and outputs of the circuit sections between the fixed resistive pad and the slope equalizer. Each of the circuit sections has a fixed resistive pad with a different predetermined value loss and a slope equalizer with a different predetermined value of a slope.

Abstract: A connector plug has an integrated electrical radio frequency (RF) suppression filter comprising a metallic filter housing which is slipped over the connector plug and electrically contacted to a ground conductor which extends from one end of the device to the other. The ground conductor is designed with a broad surface and is preferably in the form of a cross-shaped member in a central region and having ends connected to the terminal elements of Y-capacitors of the RF filter. The ground conductor is separated from the electrical filter components by an insulating lamina and the overall arrangement is encapsulated with plastic to form the plug prior to receiving the metallic housing thereover.

Abstract: A loss-impaired filter apparatus for suppressing radio frequency interference on a two-wire line. The apparatus includes a coil unit (10) comprising two coils (e.g. 3a) in the form of printed circuits on either side of an insulating plate (2), a ferrite casing (10a, 10b) surrounding the coil unit (1), there also being two capacitors (15a, 17a, 15b, 17b), the coatings of which are arranged at least practically parallel to the insulating plate (2) on two surfaces of the ferrite elements facing away from each other and facing away from the coil unit (1). Each of the coil conductors is situated directly opposite the other coil conductor along its entire length. The coating (15a, 15b) situated nearest the coil unit (1) in each capacitor is provided with an earth terminal (e.g. 16a) and the other coating (17a, 17b) in each capacitor is connected to the inner end point of the coil (e.g. 3a) situated nearest to the coating.

Abstract: An AC branch power distribution filter is provided for supplying AC power to a plurality of different load devices from a common external AC power source that eliminates the need for a separate protection device at each power outlet with the load devices. A plurality of elongate, flat conductors are coupled to the AC power source and include a neutral conductor, a ground conductor and at least one live conductor. The elongate flat conductors are parallel and spaced apart in an electrically insulated casing member. An electrically conductive shield member is electrically connected to the ground conductor and extends lengthwise of the elongate flat conductors overlying the insulative casing member. The shield member provides a shunt capacitance between ground potential and each of the live conductors and the neutral conductor. This distributed capacitance is utilized as the shunt element of the distribution filter.

Abstract: An apparatus for filtering radio frequency interference from digital signals. The filter uses a resistor, an inductor and a capacitor to provide a filter with a broad bandwidth capable of passing high frequency digital signals, while severely attenuating radio frequencies coupled to the digital signals. The filter is used primarily in conjunction with an electronic control to filter input signals to the control from remote sensors.

Abstract: A microwave bandpass filter for frequencies in the range of 30-3000 MHz comprises a substrate formed from dielectric ceramic sheets fused together and stacked according to a dielectric constant required of the filter capacitors, the plates of which are formed on the substrate. Discrete air core coils, to provide greater frequency selectivity in this particular frequency range, are attached into the circuit on a top surface of the substrate, and a drawn metal can covers the circuitry on the top surface and is soldered to a metallized coating extending over substantially all of the rest of the substrate except for surface mounting lead portions and associated conductive paths. Thus, EMI and RFI shielding is provided by the combination of the metal can and the ground plane of the circuit.

Abstract: Absorption circuits (C.sub.f,L.sub.F) are used for filtering out unwanted harmonic currents in electric lines (R, S, T), particularly for rated power within the range of 1 MVar-1 GVar, for example in the case of high-voltage direct-current transmission systems. So that the absorption circuit holds the virtual capacitance of the filter capacitor circuit (C.sub.f) at its rated value at a tuned frequency even when one or more capacitors (C11, C21, C12, C22) fail, a compensating choke (L) is provided in the cross branch of an "H" circuit of the capacitors. The capacitance of each capacitor (C11 . . . C22) is equal to the total capacitance C of the filter capacitor circuit (C.sub.f). The inductance L of the compensating choke (L) is equal to 1/.omega..sup.2 C, where .omega.=angular frequency of the harmonic. The compensating choke (L) can be designed for 5%-10% of the power of the filter choke (L.sub.F).

Abstract: A trap filter assembly, of the type which can be employed with a video cable system to block a particular channel or band of channels and pass the remaining video signal, is formed of a circuit board, a centrally-disposed cylindrical ground block, and a housing formed of male and female housing halves which are press-fit over the circuit board onto the ground block. The housing halves form a solderless connection with the ground block, and the latter forms a solderless connection with ground pads on the printed circuit board. A slot cut in the cylindrical ground block receives the printed circuit board, and a zig-zag channel structure formed in one wall of the slot permits a zig-zag signal lead to extend from one end of the printed circuit board through a ground area of the board, to the other end thereof.

Abstract: A noise filter for an electric wire of star-connected three-phase four-wire system, in which a neutral conductor has a sectional area which is larger than a sectional area of each of voltage conductors. Three voltage conductors are wound on a magnetic core that constitutes a closed magnetic path. The neutral conductor is coupled to the three voltage conductors via three respective capacitors.

Abstract: The invention provides a novel attachment for a discoid capacitor and the like to the inside of a tubular casing and to a central lead. An electrically insulating sealing element is positioned below the capacitor during assembly vertically into the casing. The element fits closely about the lead and is deformed into contact with the wall of the housing about the capacitor. The element thus forms a dam to contain solder and flux used to couple the capacitor to the lead and to the casing from above the capacitor so that the solder and flux cannot pass by the capacitor into undesirable locations below the capacitor.

Abstract: An EMI filter for use in a low frequency radio receiver. The device is inserted in the signal line between the receiver and its antenna to provide both common mode and differential mode filtering of out-of-band interfering HF signals which are picked up on the antenna as well as on the signal line and attendant cable shields.

Abstract: An N-path filter has a number N of parallel resistive-capacitive filter sections. A switching arrangement connects each filter section periodically into an input signal path through the filter. The switching arrangement also triggers a sample and hold network to sample the filtered input signal for a portion of the time each filter section is connected into the input signal path through the filter and then hold the sampled, filtered input signal. The sampling time is preferably selected to be an initial portion of the time each filter section is connected as the signal path through the filter when variations in the charging rates of the capacitors in the filter sections have the least effect. The sampled N-path filter technique thus reduces the need to match the filter section components.

Abstract: A device generates a signal corresponding to a variable magnitude associated with the reactive power of an arc furnace, in order to control a reactive power compensator. It comprises a reactive power or voltage demodulator and a set of filters connected to the output of the demodulator. The set of filters comprises active bandstop filters having a bandwidth of .+-.F relative to frequencies of 2f.sub.O, 4f.sub.O and 6f.sub.O and narrowband active bandstop filters having a bandwidth of substantially .+-.2 Hz relative to frequencies of f.sub.O and 3f.sub.O. f.sub.O is the supply frequency and F is approximately f.sub.O /2. The device further comprises a phase advance corrector circuit operative in the frequency band O-F connected to the output of the set of filters.

Abstract: An electrical suppressor filter is disclosed which has a filter housing, a circuit board arranged within the housing, electrical components electrically connected to the circuit board and power connection plugs extending through the housing wall and electrically connected to the circuit board. The power connection plugs have integral legs extending into the interior of the housing which are both mechanically and electrically connected to the circuit board.

Abstract: An apparatus for screening appliances from high frequency interference from the mains supply electrically connected to the appliance has an interference filter being incorporated in the mains plug and comprising at least an induction coil and a capacitor. The capacitors normally used to screen from asymmetric oscillations between the neutral conductor and phase conductor on the one hand and the protective conductor on the other are replaced by a screen of sheeting for the conductor leading from the plug to the appliance. The screen of sheeting is joined to the protective conductor.