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| Number | Title | Issue Date |
| 4532381 | Active impedance line feed circuit Normal operating range of an active impedance line feed circuit is extended to at least that of a prior art passive resistance line feed circuit. The active impedance line feed circuit includes tip and ring feed resistors in series with outputs of tip and... | 07/30/1985 |
| 4503289 | Line circuit with flux compensation and active impedance termination A telephone line circuit comprises a transformer that has a primary (13) and a secondary (14) winding. A low resistance (15) is connected in series with the primary winding. An amplifier circuit (17) is coupled across the resistance and serves to develop ... | 03/05/1985 |
| 4491700 | Hybrid circuit in a telephone subscriber interface circuit A hybrid circuit composed of semiconductor current amplifiers without an inductance and large capacitance has been found. The DC speech current supplied by the DC power source (33) and the speech signal from the modem (28) are adjusted by the current ampl... | 01/01/1985 |
| 4485277 | Apparatus for transmitting and/or receiving balanced signals on a two-wire telecommunication line A transformerless hybrid circuit arrangement for a subscriber line interface circuit of a telecommunications exchange is disclosed. A preferred embodiment of the hybrid arrangement comprises a first and a second operational amplifier plus a differential a... | 11/27/1984 |
| 4484032 | Active impedance transformer assisted line feed circuit A transformer assisted active impedance line circuit includes a transformer of reduced size as compared to both conventional and d.c. flux reduced transformer line circuits. The transformer has tip and ring primary windings consisting of equal turns and a... | 11/20/1984 |
| 4465902 | Digital space phone system A television receiver having two-way telephone capability includes a digitized talk channel and a digitized listen channel each having a gain-controlled amplifier selectively controlled by a switch controlled generator driven by the output of a subtractio... | 08/14/1984 |
| 4456991 | Telephone line circuit and system A telephone line circuit and system for interfacing digital exchange line circuits to a terminal interface of a switching network is disclosed. The system includes controllable active circuit impedance matching means for reducing impedance mismatch betwee... | 06/26/1984 |
| 4433215 | Solid state hybrid circuits An electronic hybrid having a two-wire port adapted to be connected to a two-wire line and separate unidirectional receive and transmit ports, means for coupling signals received at said two-wire port to said transmit port, and a circuit for converting si... | 02/21/1984 |
| 4431874 | Balanced current multiplier circuit for a subscriber loop interface circuit A balanced multiplier circuit for a subscriber loop interface circuit (SLIC) which provides both loop current to a two-wire bidirectional subscriber loop and suppression of longitudinal signals generated at the two-wire loop input to the SLIC while mainta... | 02/14/1984 |
| 4415777 | Hybrid circuit including capacitive charge-transfer means A hybrid circuit includes a capacitive charge-transfer arrangement, comprising parallel capacitors and series switches,for coupling signals in one or both directions between a four-wire line and a two-wire line. The switches are constituted by VMOS power ... | 11/15/1983 |
| 4414434 | Electronic subscriber line interface circuit having means to equalize current through the output differential amplifier In this subscriber line interface circuit which comprises a pair of amplifiers whose outputs are connected to the subscriber's line, the input terminals of these amplifiers receive by means of negative feedback voltages having opposite phases depending on... | 11/08/1983 |
| 4388500 | Electronic hybrid An improved electronic hybrid for coupling signals between two wire and four wire transmission circuits. The hybrid includes a pair of amplifiers associated with a pair of terminating impedances which are serially connected between the amplifier outputs a... | 06/14/1983 |
| 4387277 | Four wire to two wire converter The connecting device according to the present invention comprises for a two wire to four wire converter which connects the reception channel of a private network to the public network via an amplifier, whose symmetrical outputs are connected to the publi... | 06/07/1983 |
| 4375015 | Improved electronic hybrid circuit An improved electronic hybrid circuit or terminating set provides toll-grade interfacing between two and four-wire voice frequency transmission facilities. The terminating set presents a fixed input impedance to, and common mode rejection to longitudinal ... | 02/22/1983 |
| 4365119 | Automatically adjustable bidirectional-to-unidirectional transmission network "Transhybrid" loss is maximized in a transmission network of the active canceler type employed to couple receive and transmit unidirectional transmission paths to a bidirectional transmission path including 2-wire nonloaded type cable by controllably adju... | 12/21/1982 |
| 4358645 | Loop sensing circuit for use with a subscriber loop interface circuit A loop sensing circuit is coupled between a solid state hybrid circuit that provides signal conversion between a pair of unidirectional transmission paths and a bidirectional subscriber loop. The loop sensing circuit includes placing respective protection... | 11/09/1982 |
| 4357495 | Telephone line feed The direct current line feed for a telephone subscriber's line is derived from a variable voltage source connected to the line. In one case, the source is series connected in one leg of the line while in the other case it is connected across the line. In ... | 11/02/1982 |
| 4346267 | Hybrid circuit A hybrid circuit comprising a current amplifier connected between the receive path and the transmission path of a four-wire transmission path, the common output of the current amplifier being connected to a two-way transmission path and the balancing impe... | 08/24/1982 |
| 4331842 | Voice frequency repeater and term sets and other circuits therefor An electronic hybrid voice frequency repeater having a pair of term sets interconnected by a four-wire circuit for separating the two directions of signal transmission and amplifying each direction separately. Each term set couples the repeater's four-wir... | 05/25/1982 |
| 4163878 | Electronic hybrid and hybrid repeater with bridge circuit A hybrid bridge circuit has a feed amplifier and an auxiliary resistor connected in series with the output of the receive amplifier between the amplifier and a node of the bridge so that signals from the receive amplifier are transmitted through the two-w... | 08/07/1979 |
| 4128743 | Circuit arrangement for blocking a bidirectional amplifier against receiving outgoing signals A circuit for the reciprocal transmission of signals through transmitting channels. The circuit has amplifiers therein for amplifying the signals being transmitted in opposite directions along the line. A pair of electronic hybrid circuits are provided so... | 12/05/1978 |
| 4064377 | Electronic hybrid and hybrid repeater An electronic hybrid for coupling signals between two wire and four wire transmission circuits, and capable of meeting the operating requirements of practical telephone systems. The hybrid includes a pair of terminating impedances serially connected betwe... | 12/20/1977 |
