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| Number | Title | Issue Date |
| 7447305 | Method and arrangement for filtering of signals A filter (45) is passive and has a complex impedance which gives good impedance matching to the complex impedance of a transmission line. Because the filter is passive, it does not need to be powered and can thus be placed in locations that lack a power suppl... | 11/04/2008 |
| 7346149 | Method and apparatus for reversibly correcting nonlinear impairments in a communications channel In a transmission line, nonlinear impairments resulting from imperfect splices are mitigated by providing a bias current that shifts the operating points of these impairments resulting in improved stability, conductivity and linearity. ... | 03/18/2008 |
| 7224559 | Differential current detection A detection circuit detects a difference between a source current and a return current. The detection circuit includes a constantly biased magnetic core through which conductors of the source and return currents extend, and a sense winding around the core. The sense... | 05/29/2007 |
| 7181005 | Telephone interface circuit An interface circuit that interconnects a terminal device at an extension station with the adjunct port circuit of a telephone of a business communications system (BCS), such as a digital PBX. The interface circuit enables a call diverted to a BCS telephone to be an... | 02/20/2007 |
| 7161458 | Electromagnetic device having independent inductive components A multi-port electromagnetic device comprises a first magnetic core having a first closed flux path and a second magnetic core having a second closed flux path, with the first closed flux path being independent from the second closed flux path. At least one first wi... | 01/09/2007 |
| 7162028 | Universal telephony interface polarity detector A method and apparatus for measuring signals conveyed by a varying the voltage polarity across the tip and ring terminals in a telephone system is disclosed. The invention provides a composite circuit including a first stage in the form of a differential amplifier, ... | 01/09/2007 |
| 7104686 | Radiographic apparatus A radiographic apparatus includes a detection section including photoelectric conversion elements that detect radiation that has been transmitted through a subject. The apparatus has a substantially rectangular detection surface; and a housing that contains the dete... | 09/12/2006 |
| 7043012 | Method and apparatus for ring again feature for a telephone system A method and apparatus for an automatic ring again feature on a telephone set for a user that answers a telephone call not intended for that user is disclosed. If a user has answered an incoming telephone call not intended for that user, a “Ring Again” feature o... | 05/09/2006 |
| 7027590 | Dynamic allocation of overhead voltage to support simultaneous transmission of signals on a telecommunication line Overhead voltage is allocated in a telecommunication system among different AC signals, such as POTS, on-hook transmission POTS, PPM and XDSL signals, communicated between a telephonic switch and a user device. The allocation is based on the available overhead volta... | 04/11/2006 |
| 7019611 | Modem coupling circuit for power-line carrier A modem coupling circuit comprising: (a) a transformer 1 having a core 1a including a gap formed therein, primary windings N1a, N1b constituting a bifilar wound coil which is wound around the core 1a, fo... | 03/28/2006 |
| 6980643 | Fallback function telecommunications device The invention herein is fallback function communications device comprised of a microprocessor, utilized to perform a predetermined operation and processing of a predetermined input signal and then output a corresponding signal, as well as a minimum of one relay circ... | 12/27/2005 |
| 6973394 | Device for remote power feeding a terminal in a telecommunication network, and a concentrator and a repreater including the device A first resistor is connected in parallel with a second resistor having a lower resistance than the first resistor. The voltage at the terminal of the first resistor is compared with a first threshold voltage, and the voltage at the terminals of the second resistor ... | 12/06/2005 |
| 6930613 | Electrical instruments circuits A device representing a simple means of multiplying the functionality of wiring in point to point control circuits such that fault tolerant, fault reporting circuits can be constructed with less wire. The circuit can employ the wiring on a continuous basis by the us... | 08/16/2005 |
| 6393123 | Method and modem circuit for determining connection status of a phone line A circuit for determining connection status of a phone line shared by multiple telecommunications devices, such as modems and phones, is provided. The phone line includes respective tip and ring lines. The circuit comprises a first transistor stage couple... | 05/21/2002 |
| 6233462 | Portable terminal device for automatically controlling transmitting voice level and calling sound level A comparing unit 18, when a radio unit 1 receives a radio signal, compares an ambient noise level detected by a noise sensor 17 with a preset threshold value. If the ambient noise level is smaller than the threshold value, the comparing unit 18 outputs a ... | 05/15/2001 |
| 6020732 | Flux cancelling transformer line circuit A flux cancelling transformer line circuit includes an AC current source that blocks AC current and passes DC current. The current source is connected between the primary and secondary windings of a transformer. Direct current flowing through the primary ... | 02/01/2000 |
| 5991386 | Method and arrangement for the connection of multiple terminals to one subscriber line of the telephone network, and a terminal In an arrangement for the connection of two or more terminals (1, 1') to one subscriber line (3) the terminals (1, 1') are connected to a chain so that the connection from the subscriber line (3) to a terminal (1) is further branched (13) to the next term... | 11/23/1999 |
| 5970139 | T1 channel bank control process and apparatus A technique for powering telephone lines using an unbalance current source and current sink; and a technique for improving attenuation/frequency distribution and return loss (impedance matching) of transformer-coupled wire-line communications circuits by ... | 10/19/1999 |
| 5912513 | Method and apparatus for reducing power dissipation in DC termination circuit A DC termination device particularly adapted for use in a device coupled to a two wire telecommunications system. The termination device controls the tip-to-ring current through the telecommunications device by means of a voltage controlled current source... | 06/15/1999 |
| 5859906 | Telephone switch hook interface circuit A switch hook interface circuit couples a subscriber telephone to a subscriber telephone line. This interface circuit comprises a source of an off-hook signal, having one state indicating an off-hook condition, and a second state indicating an on-hook con... | 01/12/1999 |
| 5729589 | Apparatus and method for incoming call detection and alarm circuitry for cellular telephones An apparatus for use with cellular telephone to indicate an incoming telephone call to a user includes a cellular telephone battery pack having a circuit that generates a voltage signal with a value representative of the current being drawn from the batte... | 03/17/1998 |
| 5651052 | Apparatus and method for incoming call detection and alarm circuitry for cellular telephones An apparatus for use with a cellular telephone to indicate an incoming telephone call to a user includes a cellular telephone battery pack has a circuit that generates a voltage signal with a value representative of the current being drawn from the batter... | 07/22/1997 |
| 5539820 | Protection of active telephone line interface circuits A telephone line interface circuit with d.c. amplifiers coupled to tip and ring paths is protected against transient voltages by a crowbar-type protection device coupled via a diode bridge to the tip and ring paths, positive and negative terminals of the ... | 07/23/1996 |
| 5535272 | Sensor circuit for a telephone line A sensor circuit for telephone line (10) includes a detection coil (12a) inserted in a telephone line (14). The coil generates a magnetic flux according to a line current which flows in the telephone line. A magnetic sensor (12b) such as a Hall element ge... | 07/09/1996 |
| 5526420 | Communication apparatus There is disclosed a control circuit for switching between a facsimile unit and an automatic answering telephone unit. A current detecting circuit with satisfactory linearity between the mutually insulated input and output sides is used for detecting a DC... | 06/11/1996 |
| 5515433 | Resistance forward telephone line feed circuit A line feed circuit employing a low-inductance transformer, and providing a major portion of the terminating impedance as line feed resistors connected between a telephone line and the transformer primary. A low impedance output amplifier drives a low res... | 05/07/1996 |
| 5479499 | Sensor circuit for voice/fax switch with cascaded amplifier circuit A sensor circuit for telephone line includes a line current detecting circuit (52, 54) which generates a detection signal in response to a line current flowing in a telephone line (20, 22). The detection signal is applied to a first amplifier (56), and th... | 12/26/1995 |
| 5311587 | Sensor circuit for telephone line A sensor circuit for telephone line includes a detection coil (52) inserted in a telephone line (22). The coil generates a magnetic flux according to a line current which flows in the telephone line. A magnetic sensor (54) such as a Hall element generates... | 05/10/1994 |
| 5289537 | On-hook transmission circuit in cable line In an on-hook transmission circuit provided in a subscriber circuit connected between a subscriber terminal and an exchange, a constant-current source unit causes a constant current to flow in first and second wires during a period in which a control sign... | 02/22/1994 |
| 5138658 | Subscriber line interface circuit providing regulated current A subscriber line interface circuit that provides regulated current to telephone subscribers in an improved manner reducing the amount of power required to operate while maintaining a constant current source. The current to the telephone subscribers flows... | 08/11/1992 |
| 5065088 | Current sensor circuit A current sensor circuit for measuring by means of a Hall element the magnitude of a magnetic flux obtained in response to an input electric current and for generating a signal corresponding to the result of measurement, wherein a Hall element (2) is driv... | 11/12/1991 |
| 4896093 | Electronic inductor To produce a high current carring inductor with a high inductance value in space normally too small, a transformer is chosen which meets space requirements and has a primary winding of sufficient current capacity, but too little inductance. A bidirectiona... | 01/23/1990 |
| 4893331 | System allowing selective connection of various types of external apparatuses to telephone set A system allowing selective connection of various types of external apparatuses to a telephone set, which system comprises a plurality of switching circuits connected to the external apparatuses and a plurality of external apparatus interface circuit havi... | 01/09/1990 |
| 4878244 | Electronic hybrid circuit An electronic hybrid circuit includes a differential amplifier having its non-inverting input coupled via a resistor to a four-wire input port and via a coupling transformer to a two-wire input/output port, its output coupled to a four-wire output port, a... | 10/31/1989 |
| 4760379 | Fail-safe high temperature alarm A temperature sensor located at a region being monitored controls an output switch that in one position when ambient temperature is below a predetermined temperature applies current to only a first loop circuit and in another position when ambient tempera... | 07/26/1988 |
| 4707673 | Directional coupling transformer for bi-directional full duplex data bus A directional coupler transformer insensitive to data bus termination failures, includes a ferrite toroid core about which first through fourth windings are wound, the first and second windings being for connection in series with each conductor, respectiv... | 11/17/1987 |
| 4540853 | Apparatus for detecting a loop during ringing The apparatus comprises a zero pass detector (2) for detecting zero passes in a voltage signal proportional to the line current to generate a pulse signal constituted by positive and negative rectangular pulses of equal amplitude and of width dependant on... | 09/10/1985 |
| 4516070 | Magnetic current sensor with offset and load correction A mechanized system distributing the access, test and communication functions to the point of testing, typically the centralized switching facility serving the telephone loops and equipment to be tested. Computer (200) stores information about each subscr... | 05/07/1985 |
| 4480152 | Methods and apparatus for protecting line relay contacts in a telephone switching system Line relay contacts (LR11, LR12) are protected from power surges appearing on a telephone line (L1) during connect or disconnect of a station set (S1) from the line, by operating a hold relay (HR1) to place a hold bridge (HB1) across... | 10/30/1984 |
| 4431869 | Telephone line feed In a telephone line feeding arrangement, the line current is monitored by a multi-resistor network (Rp Rs) and the output of the network applied to the inputs of an operational amplifier (A3). The output of this amplifier, which is a... | 02/14/1984 |
