Class 379/383 - Of plural lines

Subclass of Class 379 - Telephonic communications
Definition: Subject matter having more than one line or loop.
No. of patents: 31
Last issue date: 01/09/2007

Number	Title	Issue Date
7162016	Multimedia adapter for headset amplifier An adapter apparatus for coupling a headset and an audio device to a telephone headset amplifier includes a first interface for sending and receiving audio signals with the telephone headset amplifier, a second interface for sending and receiving audio signals with ...	01/09/2007
6980634	Telephone circuit controller apparatus A controller selectively connecting and disconnecting extensions from a telephone line includes a plurality of extension connector ports selectively connected to a communication device and a plurality of relay switches. Each relay switch has three terminals and a to...	12/27/2005
6940968	Telephone terminal apparatus and method A telephone apparatus comprises a first audio input device, a second audio input device, a first audio output device, and a second audio output device. The telephone apparatus is operative to couple the first audio input device and the first audio output device to a...	09/06/2005
6931124	Soft mute circuit A soft mute circuit includes a programmable amplifier controlled by a register. Data is stored in the register from an adder that combines the current data in the register with a second number for increasing or decreasing the gain of the amplifier. A summation circu...	08/16/2005
6920220	Pre-zero crossing signal generator for sinusoidal voltages with DC offsets such as telephone ring voltages A circuit for closing a relay when an active AC voltage connected to one of the contacts of the relay is approximately zero volts includes a monitoring circuit that monitors the active AC voltage and outputs a phase-shifted voltage that crosses zero volts at predete...	07/19/2005
6868156	Non-voice signal repeater for speech coders A method of repeating a non-voice signal such as a dual tone, multiple frequency (DTMF) signal, by inserting a delay sequence of data values into an output data sequence of data values, a portion of the output data sequence following the delay sequence being the sam...	03/15/2005
6832721	Authentication system using information on position An authentication system and method uses information on a position of a card as determined, for example, by detecting a position of a user's cell phone and the position of a card reader determined from card reader identification data. If the card is used in a card r...	12/21/2004
6570984	Ring trip detection circuit and method for subscriber line interface A ring trip detector circuit and method for use with a plurality of subscriber line interface circuits each having at least one telephone unit connected to it, having a ring generator for feeding a ringing voltage to the subscriber line interface circuits...	05/27/2003
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
6278778	System and method of power limiting call processing in telecommunications equipment A system and method of limiting power consumption in a telecommunications equipment coupled between a plurality of far end subscriber lines and a plurality of near end subscriber lines are provided. The method includes monitoring and determining a number ...	08/21/2001
6115459	Telephone switching system for easily implementing modification of connection information and medium storing telephone system control program A telephone switching system 10 comprises a plurality of physical ports 20, and switches removable terminals based on predetermined connection information, wherein such connection information is arranged to be capable of being stored and rewritten in a RA...	09/05/2000
5991398	Telephone terminal apparatus and method A telephone apparatus comprises a first audio input device, a second audio input device, a first audio output device, and a second audio output device. The telephone apparatus is operative to couple the first audio input device and the first audio output ...	11/23/1999
5802112	Multi-level, multi-frequency interference pattern analog waveform encoding of digital data for transmission Digital data is encoded into a series of analog waveforms, called symbol waveforms, created as the result of interference of sinusoidal wave interference patterns. Each of these symbol waveforms is an encoded version of N-bits of data. These encoded symbo...	09/01/1998
5644634	System and method for dual tone multifrequency detection using variable frame widths An improved dual tone multifrequency (DTMF) signal detector which uses the Goertzel DFT algorithm and which utilizes variable or differing frame widths that are frequency dependent for improved detection and reduced error. The DTMF detector includes a cod...	07/01/1997
5577114	Subscriber line control apparatus to concurrently detect change in line state for subscriber lines and determine validity of timer device A subscriber line control device utilizes a scan input table and a last look table. The scan input table stores respective current line states of a plurality of analog subscriber lines. The last look table stores respective preceding line states of the pl...	11/19/1996
5119418	Telephone system with several terminals on a single line In a telephone system, several telephone terminals are connected to a single telephone line including several telephone interface circuits (6, 7, 8), each interface circuit being energized by ringing signals appearing on the line and being arranged betwee...	06/02/1992
4984266	Subscriber line card arrangement A subscriber line card arrangement, in which each of eight subscriber lines is interfaced by a respective high voltage analog circuit, followed by a low voltage circuit for producing essential analog functions including over-sampled analog-to-digital and ...	01/08/1991
4720847	Answering device An answering device for answering callers on at least one telephone line, has a ring detector. The ring detector is adapted to be coupled to the telephone line for sensing an incoming call thereon. The detector can provide in response to this incoming cal...	01/19/1988
4640993	Telephone subscribers' circuits A transmission chip for a telephone subscriber's instrument can be used in a variety of modes, some of which involve use with other chips. Depending on which mode is in force, different amplifiers are used. Thus for plain ordinary telephone (POT) service,...	02/03/1987
4527012	Communications switching system with modular switching communications peripheral and host computer A communications switching system is controlled as a peripheral device to a general purpose digital host computer or other host device. The switching system has a plurality of ports for telephone lines and/or trunks and makes connections to the ports. The...	07/02/1985
4446338	Telephone lines status sensor A lines status sensor provides for monitoring of the operating status of one or more telephone lines at an associated telephone station apparatus. The lines status sensor includes a translation circuit being responsive to potential differences appearing a...	05/01/1984
4373118	Battery feed circuit Electronic battery feed circuits are connected across the communication pair, in parallel with the voice transformer, and serve as a dc path for loop current. These electronic battery feed circuits must provide both a low dc impedance to sink loop current...	02/08/1983
4297531	Circuit for suppressing noise influences in the evaluation of signal states on transmission lines A circuit arrangement is provided for suppressing periodic or non-periodic noise voltage components which are superimposed as an undesirable influence on the DC voltage signal to be evaluated on DC fed, two-conductor transmission lines, particularly for e...	10/27/1981
4213013	Telephone network/subscriber interface device A modular interface device permits selective interconnection between telephone company network trunk lines and subscriber telephone lines. The device includes a housing having a removable protective cover and a first connector component having a plurality...	07/15/1980
4088844	Telephone station set interface circuit A telephone station set interface circuit is disclosed which enables a conventional nonkey telephone station set to be used in place of an electronic key telephone station set for those subscribers in an electronic business communication system requiring ...	05/09/1978
4078158	Call distributing automatic telephone installation An automatic telephone installation applicable to chronological call distributions including a plurality of inputs through junction units to a connection network formed of a switching circuit, a plurality of switching position stations, operator stations ...	03/07/1978
3999019	Private automatic branch exchange providing line appearance connection of operator complex to single stage matrix An electronic private automatic branch exchange may avoid the need for access trunks and information trunks in the operator complex by utilizing a single stage switching matrix to effect connections between line circuits, trunk circuits, and the operator ...	12/21/1976
3985975	Holographic telephone switching system A matrix of electrical to light converting diodes are each coupled to different ones of a plurality of incoming telephone lines. These diodes emit light at all times and have their light intensity modulated by intelligence when intelligence is present on ...	10/12/1976
3953682	Loop current detector A loop current detector for detecting current flowing in a pair of telephone wires comprises: A. a saturable reactor having first, second and third windings, the first and second windings adapted to be connected in a loop circuit to pass DC current, B. re...	04/27/1976
3940572	Power supply for key telephone system A power supply for a key telephone system provides regulated dc for the talk and relay circuits and various ac voltages for buzzer, lamp and ringer signaling. The power supply visually indicates dc overload, and at the same time provides effective voltage...	02/24/1976
3935393	Line condition signalling system The symmetrical line loop evaluating circuit included in this signalling system and used to pass or to block interrogating pulses to examine the closed or open condition of a subscriber line includes a first circuit comprising a diode the anode and cathod...	01/27/1976

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Class 379/383 - Of plural lines