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WO/1996/015614A1 |
A multi-system radio telephone (10) operable in at least first and second radio communication systems includes an apparatus executing a method for controlling audio output volume levels of the radio telephone. According to one embodiment...
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WO/1996/013114A1 |
A method and apparatus for providing an enhanced Call Forwarding Don't Answer feature is disclosed. When an originating address (400) calls a base address (402) assigned the Call Forwarding Don't Answer feature and the call is forwarded ...
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WO/1996/012196A1 |
The present invention relates to a method for detecting an alternating current signal of a predetermined frequency in a received signal. In order to achieve a simple and easily applicable method, it comprises the steps of feeding said re...
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WO/1996/010859A1 |
The present invention concerns an electrical supply arrangement for a mobile radio network base station accommodated in a cabinet, the supply arrangement comprising two separate modular units of which one is in the form of an a.c. unit a...
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WO/1996/009711A1 |
To determine the deviation of longitudinal signal components from a predetermined value on a balanced two-wire circuit (A, B), a first voltage is measured between one of the wires (A) and a first reference potential by means of a first v...
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WO/1996/005684A1 |
A communications marketing system (10) for selectively modifying an existing communications network by modifying a portion of the processing software permits transmitting a generally continuous pre-recorded announcement to a network stat...
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WO/1996/003811A1 |
A subscriber unit (10) of a time division multiple access (TDMA) radiotelephone system is reconfigured in each time slot to a power consumption tessellation in which circuit components (12, 13, 21, 29, 56, 57, 58) not needed for communic...
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WO/1996/002999A1 |
This invention relates to telephone ringers. A unique recordable voice/sound ringer (16) rings whenever there is a phone call. There are several modes of operation: voice/sound ringer (16) instead of a regular ringer (17), alternating re...
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WO/1996/000429A1 |
A radiotelephone (101) is adapted to generate a plurality of distinctive vibrating alert patterns. An antenna (201) receives radio frequency (RF) signals including an incoming telephone call signal (121). A receiver (205), operably coupl...
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WO/1995/034123A1 |
Inverter of the type receiving a d.c. input signal and supplying an alternating output signal with a predetermined wave form. According to the invention, said inverter consists of an input signal processing circuit comprising, in particu...
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WO/1995/028793A1 |
Where apparatus connected to a communications line is powered directly from that line it is essential that the current drawn is minimised. The present invention provides a variable power supply comprising a dc to dc conversion circuit (3...
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WO/1995/024790A1 |
A compact telephone set has a structure with separate support and handset and functional modules (LAS, EDS, LSPS, SPS, TRS, STE, BOF) located on both parts, as well as a standard connection cable (HAK) with four lines (SL1...SL4) between...
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WO/1995/021485A1 |
A power supply (20) for a private branch exchange includes a regulator (28) including power factor correction. The power supply also includes a backup battery (50) and flyback power converter (30) which is only connected to the main powe...
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WO/1995/020290A1 |
To generate a ringing signal by means of a subscriber line interface circuit having two final stages (A), each for supplying an individual subscriber line wire (LA, LB), one (LA) of the subscriber line wires is connected to one of the in...
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WO/1995/020289A1 |
A method for off-hook detection at a subscriber line interface circuit upon the occurence of a ringing signal which preferably lacks a direct current component, as well as the use of a subscriber line interface circuit for the performing...
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WO/1995/019083A2 |
The invention relates to a method for transmitting telecommunication signals over a two-wire line (a, b) to an anolog interface in a telephone exchange (2). To allow signals to be transmitted simply and reliably, a direct-current signal,...
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WO/1995/019084A1 |
A radio frequency (RF) signal transmitter/receiver system comprises a pair of transmitter/receiver units (100, 101). A microcomputer-based RF carrier detect system determines when an RF signal is present or absent. The RF carrier detect ...
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WO/1995/016328A1 |
A digital loop system with a distributed architecture that provides telephone services with high reliability and quality and is cost-effective to install. The system is central office powered and uses a trunk unit interface to interface ...
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WO/1995/012949A1 |
A complete, facile to use and operate telephone apparatus (10) for use with a communications system including a toll charge telephone system (104). The apparatus is a simplified telephone receiver with no keypad to allow only incoming ca...
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WO/1995/011549A1 |
Both ends of the primary winding of a transformer (T3 or T4) or a choke coil (L2 or L3) are connected to a current mirror circuit or a constant-voltage circuit. The AC component bypasses a transistor (Q1 or Q2) constituting a current mir...
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WO/1995/008239A1 |
The power supply unit (1) of an optical fibre telecommunications network distribution point is provided with a power supply controller comprising a switch (2), a plurality of power supply lines (4) interconnecting the switch and power su...
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WO/1995/008170A1 |
Speech is distinguished from noise by a spectral comparison (114, 115) of an input signal with a stored noise estimate (113). Updating of the noise estimate (in a buffer (113)) is permitted during periods when speech is absent under cont...
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WO/1995/005036A1 |
A method and apparatus for receiving and transmitting digital signals in a communication system is described. The present invention includes a method and apparatus for providing power (VS, VD) to a portion of a communication device for a...
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WO/1995/002936A1 |
A node power isolator for connecting a node of a two conductor transmission line network such as a twisted pair line (20, 22) to the network so as to enable the DC powering of the node from the network itself without significantly dimini...
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WO/1995/002298A1 |
A front end processor (FEP) performs in-line call processing and provides enhanced paystation services on ordinary paystation lines. The FEP is part of an overall system composed of paystations (10) comprising smart telephones, an FEP (o...
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WO/1995/001692A1 |
An electronic device (10), such as a radiotelephone, is connectable to a variable-level power source (16). Circuitry of the electronic device (10) generates power-source control signals to select the power levels of the signal generated ...
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WO/1995/000999A1 |
The invention relates to a power supply system, comprising a plurality of separate switched-mode power supplies (34) fed from a common voltage source. The switched-mode power supplies comprise a transformer (10), through which power is t...
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WO/1994/029997A1 |
The present invention is a dial in-bound MIU (100) capable of deriving its operating current from a telephone line (120). The MIU is coupled to the telephone line using conventional practices. The MIU has the capacity to initiate data tr...
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WO/1994/028667A1 |
A telephone power system comprises a constant-current power supply (D) connected in series with a circuit interconnecting two telephone instruments. The power supply may include a voltage multiplier comprising a transformer. Alternativel...
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WO/1994/028671A1 |
A fiber optic/coaxial cable telephony network including power. Power is supplied through the coaxial cable portion of the video network to a cable network unit where the power is converted and supplied to the equipment including customer...
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WO/1994/027377A1 |
A power saving standby mode that can be used in mobile radio stations operating in current networks and improves in the intended message reception. The invention enters the power down mode principally contingent upon the CRC check being ...
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WO/1994/024805A1 |
The present invention provides a simplified system for accommodating an alarm monitoring system to effectively communicate with a remote monitoring station by land lines or by a cellular communication channel. This is accomplished in a m...
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WO/1994/023508A1 |
The invention is a telephone communication system for communication between a plurality of exterior telephone lines (12) and a single common in house two wire line (20). The system comprises a control unit (10) for coupling to the plural...
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WO/1994/022254A1 |
Apparatus to connect two instruments with telephone line connections having a control unit sequentially controlling the generation of tone and ring signal generation and the provision of line voltage by detection of the conditions preval...
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WO/1994/019896A1 |
A telephone dialling code processor intercepts outgoing dialling codes such as tones or pulses from a telephone terminal or the like and if the sequence matches a stored sequence, it transmits a modified sequence to tones or pulses so th...
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WO/1994/017619A1 |
A two-wire telephone line is supplied with d.c. feed from a drive circuit (10) including two amplifiers (32) via which a transmission signal (Rx) is supplied to the line. Output potentials (TV, RV) of the two amplifiers determine a loop ...
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WO/1994/015415A1 |
A bidirectional optical communication system and method for transmitting both telephone supervisory and audio communication signals and electric power using a fiber optic cable (18) having at least one electrical conductor such as a meta...
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WO/1994/013090A1 |
A network termination unit (20) for connection to a telephone line (12, 14) at a predetermined demarcation point thereof for sequentially simulating a plurality of fault conditions to allow a diagnostic routine to be performed on the tel...
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WO/1994/013065A1 |
An aural annunciator circuit for a radio receiver and a radio transceiver incorporating such. The annunciator circuit is operative to generate an aural signal when a signal is transmitted to the receiver in a manner analogous to telephon...
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WO/1994/010786A1 |
The invention provides that physical and logical parameters of a base station can be programmed by the mobile unit of a communications terminal designed as a cordless telephone. For this purpose a programming procedure is run in the base...
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WO/1994/010809A1 |
In an information transmission system, in particular a telephone system, the subscribers can be connected to a dial exchange over a line. At the dial exchange end and at the subscriber end of the line are connected bidirectional multiple...
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WO/1994/010782A1 |
Following initialization of the charging process of a cordless communications transmitter (KES) in a charging device (LE), the charging voltages (LS) are measured at predetermined time spans (za). Comparison measurements of the measured ...
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WO/1994/006254A1 |
A telephone system comprises: a telephone exchange with a central unit which is adapted for processing at least speech signals and call signals; a number of cordless handsets; at least one transmitter/receiver for communication between t...
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WO/1994/006215A1 |
An apparatus for communicating over the telephone line (6) via socket (8) has a microprocessor (10), a memory comprising p-ROM (12), and RAM (14), a modem (20), a parallel port (16) and interface (17), a serial port (18) and interface (1...
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WO/1994/003990A1 |
Apparatus for interfacing a communications equipment to a communications network. The apparatus includes a first part connectable to the network and a second part connectable to the equipment. The apparatus further includes an isolation ...
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WO/1993/025037A1 |
A telephone line power strip off circuit includes a low loss polarity guard sub-circuit (3, 4), a low loss line seize sub-circuit (5), a low loss speech transformer sub-circuit (7) and a high efficiency switched mode power supply (13) wh...
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WO/1993/021723A1 |
An impedance generator, especially suitable for determining a terminating impedance of a telephone line interface circuit, comprises a subtracting circuit (28) for forming a difference (Va) between an input voltage (Vin) multiplied by a ...
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WO/1993/021722A1 |
A line interface circuit for a two-wire telephone line comprises two feed resistors (40) connected in series with two primary windings of a transformer (38), and differential amplifiers (50) capacitively coupled to a secondary winding of...
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WO/1993/021724A1 |
A telephone line interface circuit comprises two unity gain d.c. amplifiers (132, 134) having outputs d.c. coupled via feed resistors to the line wires. Currents in the feed resistors are monitored via a digital control circuit (152), wh...
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WO/1993/020646A1 |
The invention relates to a circuit arrangement for a combined supply voltage connection and call a.c. voltage generator and connection for analog telephone receiver stations in extension installations. The purpose is to make such a circu...
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