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2016

19491304VOIP analog telephone system
29420110Telephony terminal

2015

39148909Mobile terminal
49125227Communications device for a wireless and land-line network
59100499Communication apparatus and method with off-hook detection and power supply control
69088648System and method for effecting prearranged notification following placing of a call using a predetermined number
79059779Serial digital interface between an RF transceiver and a baseband chip
89058169Method and system for waking up remote devices

2010

97672450Network interface device enclosure

2007

107200223Electronic circuit to reduce noise in digital subscriber loop and communications over unshielded twisted pair metallic conductors

2006

117031462Electronic inductor with transmit signal telephone line driver
127031454Method and apparatus for interfacing telephone apparatus to a digital, analog or hybrid telephone switching system

2005

136950514Voltage reference filter for subscriber line interface circuit
146940968Telephone terminal apparatus and method
156937719Multiplexing and demultiplexing of narrowband and broadband services in a transmission connection
166930751Method and apparatus for reducing false hook detection
176928159Telephone for connection to a public telephone network
186922470Hybrid DC-feed controller for a subscriber line interface circuit
196914963Determining the composition of subscriber loops from frequency domain measurements
206904145ADSL front-end in a low voltage process that accommodates large line voltages
216904144Impedance compensation in interfacing a modem to a telephone line
226895089Pots splitter with line impedance matching
236888938Dynamically adjustable digital gyrator having extendable feedback for stable DC load line
246882716Local control of call features in a telephone system
256876742High-voltage protection circuitry in a data access arrangement
266873703Precision, low-power current-sense transmission channel for subscriber line interface circuit, programmable with single ended impedances and capable of exhibiting a voltage sense response
276870928Line interface, apparatus and method for coupling transceiver and transmission line
286868081Method and apparatus for simultaneous multiline phone and data services over a single access facility
296853724Cascade low-pass filter to improve xDSL band attenuation for POTS splitter
306845157Linear polarity guard and method for DSL-ready pots devices
316845149Method for frequency and loop length grouping for cross-talk reduction in a plurality of DSL channels
326842520Telephone

2004

336819761Programmable constant current "off hook" circuit
346792105Current-mode differential active hybrid circuit
356792104Transformer-coupled matching impedance
366788953Wireless local loop communication system using SLIC module
376782098Protection circuit/method for subscriber telephone interface circuit
386781957Application module interface for a control channel in a private branch exchange (PBX) environment
396757386Apparatus, system, and method for efficient reduction of electromagnetic interference in telecommunications equipment
406757382Quasi ground fault interruption signal-based activation of emergency pots by-pass paths for line-powered digital subscriber loop
416757381Design of telephone line interface circuits using a two chip opto-coupler with LEDs integrated onto silicon chips
426757380Impedance blocking filter circuit for digital subscriber line communication systems
436748077Station interface and protector with built in redundancy
446744883Filter system and method to suppress interference imposed upon a frequency-division multiplexed channel
456735305Detection of low tip/ring currents in a line powered DAA
466731752Method and circuit for echo-cancellation in two-way communications
476731751Apparatus for cordless computer telephony
486731748Audio interface for satellite user terminals
496724890Adaptive transmission line impedance matching device and method
506714647Network interface unit with subscriber line daughter boards
516714645Telephone line interface circuit without hookswitch relay
526704416Hook switch status glitch filter
536697485Data signal attenuator and systems and methods for using same
546694016Odd-order low-pass POTS device microfilter
556694014Constant impedance digital line interface circuit

2003

566665403Digital gyrator
576665400Low-voltage transistor circuit for suppressing high-voltage surges in a telephone line interface circuit
586661893Telephone loop monitoring and isolation system
596650841Optical subscriber line terminal unit and a state transition control method
606647115Method and apparatus for an improved analog echo canceller
616647114Telephone line interface circuit with virtual impedance
626643270Method of compensating for systemic impairments in a telecommunications network
636628782Ring voltage termination by means of a spare fuse
646625278Impedance matching with sigma delta filter
656621904Pre-charging line modem capacitors to reduce DC setup time
666618474Method and apparatus for providing to a customer a promotional message between ringing signals or after a call waiting tone
676608899Telephone circuit surge protection module
686606231Integrated telephony subscriber line protection and filter device
696553118Method and apparatus for calculating DC offset in a digital gyrator
706507654Line interface battery feed arrangements with PTC resistors
716504927Mechanism for measuring resistance of telephone subscriber line and generating measurement as pulse width of periodic waveform

2002

726480604Balanced spectrum limiter for telephone and communication systems and protection module incorporating the same
736473507Apparatus and method for isolating transients associated with a digital subscriber line
746470083Telecommunications off-hook and intrusion detection method and apparatus
756442255Automatic subscriber callback system
766438225Method and system for detecting and controlling severe echo
776434220Long-distance transmission system and device
786418222High current protection circuit for telephone interface
796418220Extended feedback circuit employing capacitive coupling and sampled data filters
806411680Telephonic apparatus and input device for telephonic apparatus
816396922Telecommunications terminal card
826393110Methods and apparatus for terminating a line and supporting the asymmetric digital subscriber line protocol
836384946Electrical isolation between IR receiver and further electronic circuits
846351531Method and system for controlling echo cancellation using zero echo path, ringing, and off-hook detection
856343126Method and apparatus for interfacing analog telephone apparatus to a digital, analog or hybrid telephone switching system
866343069Apparatus and method for automatic and adaptive adjustment of build-out capacitance to balance a hybrid
876342999Current surge absorbing wire winding box

2001

886327301Detection and adaptation to digital network impairments by PCM modems
896314180System and method for providing a frequency dependent synthetic termination
906301337Combined handset and POTS filter
916298134System for protecting telecommunications equipment from transient voltages
926285754Odd-order low-pass pots device microfilter
936282001Data access arrangement having improved transmit-receive separation
946275582Differential line bridge for scaleable near-end speech cancellation for tip and ring tone signal detectors
956275581Extended feedback circuit employing capacitive coupling and sampled data filters
966263076Arrangement in a subscriber line interface circuit
976259788Technique for balancing loads in a communication network
986259589Protection apparatus applied to a telephone line
996240177Communication device comprising an off-hook detection circuit
1006233334Telecommunication circuit and a telecommunication device
1016229890Network interface device with automatic connector closure
1026205201Telephone line testing device
1036198817Communication interface having combined shaping of receive response and synthesized matching terminating impedances for different frequency bands and a design method therefor
1046192125Optical coupling circuit for a data access arrangement (DAA)
1056186834Enhanced communication connector assembly with crosstalk compensation
1066185296Ring trip circuit for stopping call signal at different timing from zero-crossing point of call signal
1076185293Signal matching apparatus for exchanging signals between an analog switching system and a digital switching system
1086185083Protected telecommunication test adapter module
1096181792Communication interface having synthesized matching impedances for different frequency bands and a design method therefor
1106178162Method and apparatus for inhibiting echo in a channel of a communication system
1116176742Capacitive crosstalk compensation arrangement for communication connectors

2000

1126163447Telephone equipment protection circuit
1136157712Speech immunity enhancement in linear prediction based DTMF detector
1146151392Telecommunications protector panel connector assembly
1156144735Filters for a digital subscriber line system for voice communication over a telephone line
1166137879Computer telephony headset amplifier
1176134321Modem loop current detect system to detect an off-hook condition in an extension telephone
1186128368Apparatus for monitoring telecommunication transmission
1196115466Subscriber line system having a dual-mode filter for voice communications over a telephone line
1206111936Method and apparatus for automatically detecting and measuring distortion in a DSL system
1216091338System and method for safety protection of XDSL circuitry
1226088446Protection circuit for use with a telephone appliance and methods of use
1236084958Determining the manner in which the wires connecting to a base set of a telephone system are used for transmission and reception of electrical signals representing a communication
1246081593Method and apparatus for transmitting white noise for echo cancellation in a voice mail system
1256078662Radio frequency interference filter
1266060972Method and means for replacing an electrically conducting cable by another electrically conducting cable
1276055435Wireless telephone connection surge suppressor
1286055310Phase reversal tone detector using DSP
1296028919Passive distributed filter system and method including caller ID
1306011831Network interface device having cavities for housing test circuitry

1999

1316005933Method for communication with no power feed and exchange for realizing the method
1326002684Method and system for achieving faster asymmetric data transmission through the public switched telephone network
1335999619Synthetic termination
1345999612Integrated telephony and data services over cable networks
1355995619Telephony device with compensation for line losses
1365991398Telephone terminal apparatus and method
1375982878Combined loop current sink, battery detector, and ringing detector circuit
1385975924Grounding mechanism with integrated strain relief
1395974139Line isolation device for asymmetrical digital subscriber line
1405963588Apparatus for modulating/demodulating signals
1415959815Method and apparatus for detecting potentially damaging electrical fields
1425956385Test set interface for automatically detecting line type
1435953194Arrangement for protecting telecommunications equipment from voltage transients
1445946394Isolation amplifier with hook switch control
1455943419Subscriber circuit with built-in polarity switching circuit
1465912964Adaptive telephone handset interface
1475912513Method and apparatus for reducing power dissipation in DC termination circuit
1485893034Cordless parent/slave telephone set with improved sidetone handling
1495889854Technique for compensating for signal attenuation on a telephone line
1505888085Network interface device with switchable contacts
1515883953Telephone and data communications line protection module and grounding spring clip
1525878132High-frequency noise elimination for use in telephone systems
1535870465Telephony adapter system for providing a user with a virtual presence to an office
1545867083Protective device for surge current protection of associated equipment in communications systems
1555857010Power-failure resistant communication system

1998

1565822426Balanced hybrid circuit
1575818923System and method for supressing pulse dialing feedback occurring particularly with auxiliary acoustic ringers in socket telephone systems
1585815918Method for replacing an electrically conducting cable by another electrically conducting cable
1595809134Telephone interface circuit with impedance termination during call pauses
1605809109Integrated ring sensor with fault detection
1615802170Customer bridge module
1625796817Hybrid circuit for an electric operating and scanning interface, applicable to electronic recorders of electromechanical telephone stations
1635783999Audio warning device for use with a line current protection circuit in a PCMCIA-architecture modem card
1645777836Line current protection circuit and method for use with a PCMCIA-architecture modem card
1655771286Speech amplifier associated with an LED
1665751803Telephone line coupler
1675748719Relay circuit for telephone interface
1685742676Circuit for telephone set comprising a light-emitting diode power supply
1695742417Data access arrangement having improved transmit-receive separation
1705719917Circuit for activating back-up lines
1715717558Electrostatic discharge protection for an electrical device
1725710811Speech circuit for subscriber telephone apparatus

1997

1735696660Line current protection circuit for use with a PCMCIA-architecture modem card
1745694460Circuit and method for reducing common mode interference in telephone instruments
1755692041Telephone subscriber circuit with galvanic isolation
1765661624Foldback current limiting of a telephone line switch
1775659602Telephone apparatus for caller ID
1785642416AM broadcast band interference filter for line-powered telephone
1795640451Power cross detection using loop current and voltage
1805638440Protection circuit for telephone systems
1815637011Wire termination device
1825633925Low loss telephone circuit
1835627890Telephone line interface circuit
1845608795Telephone line interface circuit
1855606592Method and apparatus for analyzing resistive faults on telephones cables
1865602914Device for limiting the working voltage for mechanical switches in telephony
1875598467Signal interface circuit with selectable signal interface parameters
1885596470Fault current protection circuit for an auxiliary device in a digital telephone system

1996

1895590185Multiple phone line adaptor
1905579144Data access arrangement having improved transmit-receive separation
1915555293Optically-coupled data access arrangement and transhybrid
1925553136Modular device for telephone network interface apparatus
1935539801Removable telephone line protection module for an electronic device
1945537471Weatherproof telephone station protectors
1955532898Line current protection circuit for use with a PCMCIA-architecture modem card
1965528683Method and circuit for implementing an impedance, in particular for DC telephonic applications
1975513059Arrangement for protecting telecommunications equipment from voltage transients
1985502760Telephone-line dedicating apparatus
1995500895Telephone isolation device
2005497417Switching device for transmitting telecommunication signals
2015483577Single chip telephone answering machine, telephone, speakerphone, and ADSI controller

1995

2025473685Telecommunications end station with electrically controlled terminating impedance
2035465298Solid state isolation device using opto-isolators
2045461670Telephone subscriber system incorporating a drive interface for a telephone line switch at a different reference potential
2055459787Circuit for the implementation of an impedance for a telephone speech circuit
2065459783Acoustic feedback suppression device particulary for auxiliary ringers in plug-in telephone systems
2075448636Device for limiting the working voltage mechanical switches in telephony
2085416663Arrangement for protecting telecommunications equipment from voltage transients
2095408525Diverter interface between two telecommunication lines and a station set
2105402465Telephone trouble isolator
2115396549Terminal station for telecommunication by wire
2125390231Protection and recovery of telephone line interface circuits
2135384842Programmable telephone

1994

2145359657Telephone line overvoltage protection apparatus
2155357568Telephone line overvoltage protection method and apparatus
2165347565Order wire device having function for reducing noise in communication system having a plurality of order wire devices
2175315651Active surge rejection circuit

1993

2185271059Method and configuration for forming a line termination of a telephone line
2195258713Impedance generator for a telephone line interface circuit
2205222131Telephone protector including removable fuse holder
2215208718Protection circuit

1992

2225172412Subscriber circuit capable of suppressing in-phase induced noise
2235105461Telephone line interface circuit

1991

2245073924Telephone line noise filter apparatus
2255048073Telephone line switching interface unit
2265038375Circuit arrangement for preventing gain from responding to frequency variation despite the presence of an isolation transformer
2274996710Side-tone adjusting system and method for key telephone system establishing a plurel kinds of speaking paths
2284994759Current equalizing circuit
2294993060Portable device for use by a news reporter

1990

2304971581Connector guard for a telephone line overvoltage protection device
2314961219Circuit for synthesizing an impedance across the tip and ring leads of a telephone line circuit
2324947426Telephone protection circuit
2334935957Key telephone system
2344926473Longitudinal balance system
2354918725Terminal impedance setting circuit for a two-wire to four-wire converting circuit
2364896352Telephone set circuit including an overvoltage protection
2374894863Method for gain control in telephone sets having an electronic speech circuit, and apparatus for performing the method
2384893337Circuit arrangement for a digital telephone station
2394893331System allowing selective connection of various types of external apparatuses to telephone set

1989

2404876713Signal circuit protector device for consumer use
2414856058Office line interface circuits
2424817204Optical communication apparatus and method for telephone supervisory and audio signals

1988

2434788717Telephone line interface option module
2444757528Thermally coupled information transmission across electrical isolation boundaries
2454750203Subscriber telephone set with amplified loudspeaker reception with reduction of gain in the case of an insufficient power supply
2464742540Circuit for switching between balanced networks
2474727571Circuit for surge voltage protection in electronic telephone stations
2484723278Voice circuit of telephone
2494723276Two-module telephone terminal

1987

2504677667Subscriber line circuit having improved AC impedance matching
2514634814Surge protected electronic switch for telephone voiceband circuits

1986

2524607142Transformer flux compensation circuit
2534571460Active impedance line feed circuit with improved ground fault protection

1985

2544560834Current limiter circuit for battery feed in a telephone circuit
2554558183Opto-coupler interfacing circuit
2564549129Regulator circuit
2574536616Microphone or mouthpiece signal suppression circuit
2584515996Telephone circuit
2594513178Signal processing arrangement
2604502018Gain regulation circuit for an amplifier circuit
2614495382Telephone regulator circuitry

1984

2624465903Electronic telephone interface circuit
2634453038Circuit arrangement for producing control means from line current
2644453037Loop length compensation circuit
2654449157Surge protection for signal transmission systems
2664442325Switchable incremental attenuation for telephone line interface
2674439637Low loop current switch latch circuit

1983

2684400589Subscriber station network
2694400588Electronic voice network for a telephone subscriber's substation
2704394542Telephone transmission circuit
2714375015Improved electronic hybrid circuit
2724369337Central office interface circuit

1982

2734357494Impedance canceller circuit
2744350964Impedance generator circuit
2754315107Telephone range extender with gain

1981

2764303805Subscriber station network
2774298775Microprocessor controlled telephone set
2784283604Current source circuits with common mode noise rejection
2794268723Circuits and methods for initializing the loop current of a telephone set
2804264787Hazardous voltage protection circuit
2814254442Circuit for the protection of telephone lines

1980

2824228323Variable loop length compensated barrier circuit
2834214130Signal coupler
2844213012Discriminating means for telephone circuits
2854203006Direct access coupler

1979

2864178484Long line telephone system with an amplifying substation
2874176255Adjustable impedance battery feed circuit
2884169215Signal limiting circuit
2894152549Suppressor of spurious ringing currents for telephone apparatus
2904143247Automatic signal level adjusting circuits for use in telephone sets
2914140881Telephone loop extending apparatus
2924132863Automatic gain and return loss compensating line circuit

1978

2934107477Multi-subscriber telephone apparatus
2944079211Protection device for a subscriber's telephone set
2954071713Telephone speech network
2964068282Protective device for low current transmission circuits

1977

2974048647Solid state disconnect device
2984039759Line security device
2994002852Electronic telephone network

1976

3003989902Alternating current regulator for use with telephone type line
3013962664Current protector
3023961229Two pair station protector
3033947730Telephone line surge protecting device
© 2017, ПАТ-Инфо, В.И. Карнышев
Дата формирования списка: 03.04.2017