Celebrity Inventors
Glam girl Heddy Lamar may have used her good looks to good effect on the silver screen, but she put her smarts to better use as an inventor. During World War II, she co-patented a frequency-switching system for torpedo guidance that was considered years ahead of its time.
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| Number | Title | Issue Date |
| 7813500 | Method and apparatus for ringing A method and apparatus is provided for ring-trip detection in a line card having an analog-to-digital converter for processing voice signals. The method includes receiving a ringing control signal, transmitting a ringing signal to a subscriber line in response to th... | 10/12/2010 |
| 7480378 | Method and system for increasing subscriber line interface circuit voltage during ringing A voltage controller increases a DC input voltage in response to a ring instruction received from a processor in a control signal. The increased voltage is converted to an AC ring signal that causes a telephone to ring. The ring signal voltage is generated at a batt... | 01/20/2009 |
| 7312614 | Commutator for power supply testing A commutator for power supply testing includes a printed circuit board (PCB), a plurality of connectors soldered on the PCB and coupling a power supply with an electronic load, a plurality of indicator light showing whether the power supply coupled to the commutator... | 12/25/2007 |
| 7287990 | Method and apparatus for grounding a cable A method and apparatus for grounding cables (e.g., fiber cables or copper wire cables) used in networks such as the telecommunications networks are disclosed. For example, the apparatus comprises an enclosure having a plurality of metal posts, e.g., metallic bolts, ... | 10/30/2007 |
| 7260210 | Unbalanced slic with a built-in ring circuit A method and apparatus is provided for implementing an unbalanced subscriber line interface circuit with built-in ring circuit. A signal to be conditioned is received. An unbalanced output buffering function is performed upon the signal to be conditioned using an un... | 08/21/2007 |
| 7260103 | Mode-dependent, multiple bias-driven battery switch for subscriber line interface circuit A mode-dependent, battery-coupling switch for a subscriber line interface circuit (SLIC) selectively adjusts its current requirements to provide optimal current handling capability irrespective of the mode of operation of the SLIC. Where current demands of the SLIC ... | 08/21/2007 |
| 7257222 | Ring voltage generation circuit and method for generating a ring voltage The present invention relates to a ring voltage generation circuit for generating a ring voltage (VTR) between a TIP lead (9) and a RING lead (10) with minimized power loss for electronic subscriber circuits, comprising: a) an amplifier circuit ... | 08/14/2007 |
| 7251321 | Crescendo telephone ringer Crescendo telephone ringers and methods of providing a crescendo telephone ring signal. The crescendo telephone ringer provides a gradual increase in audible ringing volume as a sequence of incoming electrical ring signals is detected. According to one embodiment, u... | 07/31/2007 |
| 7242764 | Power feeding system for telephone terminal in LAN Terminals are connected via cables in a star-shaped fashion with respect to a HUB in a LAN. Each of the cables includes therein signal lines and power feed lines. The HUB includes therein a power feed section. The power feed section and the power feed lines of each ... | 07/10/2007 |
| 7239695 | Method and apparatus for detecting line card threshold A method and apparatus is provided. The method includes transmitting a signal having an AC component to a subscriber line and receiving at least a portion of the transmitted signal from the subscriber line. The method includes determining at least a portion of a per... | 07/03/2007 |
| 7218713 | Telephone line interface for DAA circuitry A telephone line interface and associated circuitry that may be implemented to simultaneously couple DC loop voltage, ring bursts, and caller-ID data to the phone line side of a DAA circuit through a single two wire resistively coupled interface. The interface and c... | 05/15/2007 |
| 7209554 | Ringing controller In a telecommunications system, a switching device selectively applies one of two different voltage supplies to a common node. A first of the voltage supplies is coupled to the common node by a first switch and a second of the voltage supplies is coupled to the comm... | 04/24/2007 |
| 7180999 | Subscriber line interface circuitry Subscriber line interface circuitry includes an integrated circuit having sense inputs for a sensed tip signal and a sensed ring signal of a subscriber loop. The integrated circuit generates a subscriber loop linefeed driver control signal in response to the sensed ... | 02/20/2007 |
| RE39406 | Telephone line coupler The telephone line coupler circuit has a single transmit opto-coupler whose output includes a DC bias component connected to a gate of a line seize switch for connecting a DC line seize load across the ring and tip contacts of the telephone line. The line seize swit... | 11/21/2006 |
| 7099462 | Silent ringing with reduced device sizes A system and a method selectively switch between two different voltage supplies supplying a common node. A first of the voltage supplies is coupled to the common node by a first switch and a second of the voltage supplies is coupled to the common node by a second sw... | 08/29/2006 |
| 7095847 | DC/DC converter and subscriber line interface circuit A DC/DC converter capable of preventing abnormal temperature increase in a power transistor. The DC/DC converter comprises a loop circuit, a power transistor, an abnormal high temperature detection circuit, and an abnormality processing circuit. The power transistor... | 08/22/2006 |
| 7088819 | Localization of an IP telecommunications terminal over a LAN The present invention relates to a possibility to localize a telecommunications terminal over a local area network. More specifically, the invention provides a method for associating a port number of a powering equipment to which will be connected a telecommunicatio... | 08/08/2006 |
| 7085372 | Method and device for transmitting a transmission signal via a two-core line Method and apparatus for transmitting a transmission signal via a two-core line, in particular a telephone line, in which case, with the aid of corresponding transmission devices (2, 3), two partial signals are generated and are transmitted via a respective c... | 08/01/2006 |
| 7076055 | Tracking switchmode power converter for telephony interface circuit A comparator-based switchmode power converter monitors the most negative of the tip and ring line voltages, to control the supply voltage to a SLIC. The voltage applied to the SLIC's power terminals is slightly higher than the sensed voltage for different loop signa... | 07/11/2006 |
| 7073108 | Communications jacks including test circuits and related circuits and methods A jack for a communications line can include first and second input terminals configured to receive respective first and second conductors of a communications line, and first and second output terminals electrically coupled to the respective first and second input t... | 07/04/2006 |
| 7072463 | Apparatus and method for programmable line interface impedance matching A line interface capable of connecting to a variety of transport mediums, each having a different impedance. The line interface comprises a programmable resistor. The programmable resistor along with an external resistor provide a range of resistor values which are ... | 07/04/2006 |
| 7054372 | Digital transmission line tap circuit A digital transmission line tap circuit is provided for applying a non-intrusive tap on a digital transmission line thus allowing the transmission signal to be monitored or utilized by another piece of transmission equipment. The tap circuit incorporates all the req... | 05/30/2006 |
| 7046797 | Telephone system with controllable ringing voltage A telephone system includes a controllable ringing generator for generating a ringing signal and an interface for providing a ringing voltage derived from that signal on the transmission line. The controllable ringing generator includes a control device for controll... | 05/16/2006 |
| 7046793 | Digital access arrangement circuitry and method having current ramping control of the hookswitch A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end to provide a communication path for signals to and from the phone lines. Briefly described, a means for providing a proper hookswitch transition ... | 05/16/2006 |
| 7031464 | Ring relay control unit for foreign exchange station The ring relay control unit of an FXS includes a main control unit for controlling relay interrupt command; a relay control device for generating a relay control signal in accordance with a relay interrupt command transferred from the main control unit, an SLIC for ... | 04/18/2006 |
| 7010120 | Method for adjusting a ringing signal current in a subscriber line and circuit arrangement The invention creates a method for adjusting a ringing signal current in a subscriber line (106), a ringing signal generator (114) which generates the ringing signal being connected with one end of the subscriber line (106) and at least one subs... | 03/07/2006 |
| 7006623 | Circuit for reducing voltage peak in interfacing with a telephone line According to an embodiment, a DC driver circuit is coupled to a tip/ring line. The DC driver circuit includes a first capacitor coupled to a first switch where the first switch is coupled to an amplification circuit. An RC circuit is coupled to a second switch where... | 02/28/2006 |
| 6999581 | Event detection circuit A network interface circuit that screens out transient signals and provides an indication to the line side that an actual event has occurred, so that appropriate discrimination circuitry is powered up to determine the exact nature of the actual event only when actua... | 02/14/2006 |
| 6975723 | Architecture for minimum loop current during ringing and caller ID A communication system is provided which draws virtually no loop current during a ringing burst and only draws on-hook loop current during the caller ID field. More particularly, ringer burst circuitry may be powered from the user powered circuitry by the transmissi... | 12/13/2005 |
| 6973178 | Method and apparatus for implementing a bandlimited ringing signal for telephone networks Method and apparatus for generating a bandlimited square waveform for use as a ringing voltage in a telephone network is described. One embodiment comprises a method of generating a ringing voltage signal for transmission to a telephone device. The method comprises ... | 12/06/2005 |
| 6973181 | Method of generating a ring signal in a subscriber line interface circuit technical field In a method and a device for controlling the magnitude of the generated ring signal in a the Subscriber Line Interface Circuit (SLIC) the voltage of the A and B lines to the subscriber from the SLIC is compared to a reference voltage. The device is arranged to contr... | 12/06/2005 |
| 6970557 | Cordless telephone-to-sound card interface adapter having a hybrid transformer circuit A cordless telephone-to-sound card interface adapter provides a connection between any standard cordless telephone system and a sound card of a computer for PC-to-PC or PC-to-telephone voice communications over the Internet. The interface adapter includes a hybrid t... | 11/29/2005 |
| 6940970 | Ring boost circuit to extend ringing range of telephone SLICs A ring boost circuit has a first switching device coupled to a ring node. The first switching device is responsive to a ring operation. A charge pump is connected to the ring node, and the charge pump provides a voltage offset to enhance a differential voltage betwe... | 09/06/2005 |
| 6925178 | Returning ringing signals through the tip amplifier of subscriber-line interface circuitry A subscriber-line interface circuit (SLIC) has tip and ring amplifiers connected to the tip and ring lines, respectively, of customer premises equipment (CPE). The SLIC returns the ringing signal (provided to the CPE from a power supply connected to the CPE's ring l... | 08/02/2005 |
| 6922469 | Separation of ring detection functions across isolation barrier for minimum power A communication system of the present invention utilizes ring detection circuitry on both sides of an isolation barrier. More particularly, the ring detection circuitry may include ring burst circuitry on the phone line side of the isolation barrier and ringer timin... | 07/26/2005 |
| 6917681 | Peak power management and active decoupling arrangement for span-powered remote terminal access platforms A power management circuit for a remote access platform extracts power from a wireline for powering a ring generator that generates a ringing voltage signal that is distributed to a plurality of subscriber circuits. A power-limited voltage converter steps up the wir... | 07/12/2005 |
| 6914980 | Power switch device utilizing phone loop signals to control supply of electrical power to a telephony instrument A power switch device is used with a telephony instrument that is connected to a local phone loop via two telephone wires and that has two power lines for connection to a power source. The device includes a rectifier connected to the telephone wires, and a latching ... | 07/05/2005 |
| 6912282 | Enabling Cisco legacy power to support IEEE 802.3 AF standard power An apparatus and method for enabling Cisco legacy power to support IEEE 802.3 AF standard power. A network power system capable of delivering data terminal equipment power via a media dependent interface includes power source equipment according to Cisco legacy powe... | 06/28/2005 |
| 6888939 | Circuit for joint transmitting voice and data over a telephone line The invention relates to an SLIC circuit (1), which is connected directly to a telephone line (2), for joint transmission of voice and data via the telephone line (2), with adequate echo attenuation achieved even at high data frequencies in that... | 05/03/2005 |
| 6873702 | Telephone subscriber system A subscriber's telephone system is presented that includes at least one driver circuit connected to Tip and Ring terminals. An additional network is connected between an output of the driver circuit and the Ring terminal. This additional network includes a suitably ... | 03/29/2005 |
