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WO/1991/011873A1 |
A unique speakerphone for cellular telephones includes in the transmit audio path between microphone (112) and transmitter (118), a transmitter mute switch which disconnects the audio path to the transmitter from the microphone (112), an...
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WO/1991/011060A1 |
This invention relates to an echo canceller such as for use in a full duplex hands free radio. The echo canceller is particularly suitable for use in a vehicle fitted with a microphone and a loudspeaker, for cancelling echos reach the ra...
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WO/1991/003116A1 |
The device comprises an echo cancelling circuit (3) which receives a first signal (RECEIVED) and a second signal (PM), and a real echo (ECR) between routes for producing a third signal (RESIDUE) including the second signal (PM) and a dif...
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WO/1990/013196A1 |
A device for telecommunication systems, in particular a telephone or radio set, or telephone station of a two-way intercom system, with a component containing at least one loudspeaker and one microphone, is designed to be held in the han...
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WO/1990/006649A1 |
A telephone circuit having a microphone amplifier (2), a speaker amplifier (20) and a speech network (3) coupled between the amplifiers and to means (22) for receiving and transmitting speech signals is prone to oscillation due to feedba...
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WO/1989/011186A1 |
An intercom system for use in combination with a multi-line telephone system wherein the intercom system utilizes the same wire pair for communications between intercom units that is used for normal telephone communications. The intercom...
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WO/1989/009518A1 |
A bidirectional broadband and telephony network controllable from the exchange end (15). An optical fibre (16) carries the services to customers premises (30, 31) via passive optical splitters (17, 18). Telephony from block (10) is provi...
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WO/1989/006463A1 |
A circuit/device that can be designed into new telephone subsets as well as connected to existing telephones to prevent unwanted telephone extensions from interfering with the controlling extension. The device is operated by a single pus...
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WO/1989/006076A1 |
A call processor (32) for intercepting incoming calls to a key telephone system (10) and returning a message to a calling party. A digital message storage unit (48) stores messages associating called parties with respective pseudo-teleph...
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WO/1989/005068A1 |
An echo compensator (EK) for the autonomous speech system of a mobile telephone contains a digital signal processor (DSP) connected via analog/digital converters (A/D) to the emission and reception lines (SL, EL) in the low-frequency sec...
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WO/1989/004573A1 |
A switching system (100) where any number of the call appearance (CA1, CA2, CA3, CA4) of a directory number (DN2) is reservable, and where a reservation type is defined for the directory number such that calls to and from the reserved ca...
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WO/1989/003139A1 |
A reliable method for terminating a telephone call is disclosed using a specific sequence of steps performed by hands-free control system. The invention requires that the call terminating command sequence be recognized as: two separate s...
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WO/1989/001277A1 |
A distributed control switching system (100) where calls, to and from a directory number that is shared by a key-system group (180) of terminals, are processed cooperatively by multiple, distributed control unit (111, 121, 131, 141) but ...
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WO/1988/006823A1 |
The invention relates to an internal communication system comprising a number of station units (1), each being in the conventional way intended to be used next to a telephone set and having associated keyboards (15) for combination of fi...
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WO/1988/005240A1 |
Two to nine telephones (TI1-TI9) are connected to a telephone cable (20) by control or signalling devices (CD1 to CD9), there being one per telephone. The devices (CD) together act as a telephone exchange distributed along the cable (20)...
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WO/1988/004501A1 |
A stand-alone keyphone system (10) designed to be installed at any location where it is desired that a plurality of telephone lines be available to each of many user points. The system operates independently of all other systems and with...
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WO/1988/003734A1 |
A telephone conversion device (10) for converting a multiple line electromechanical telephone system having an electromechanical key system unit (KSU) (18) for use with electronic telephones (21). Each conversion device includes a wall u...
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WO/1988/002968A1 |
A communications system having at least one communications link (13) connected at a first end thereof to an exchange network, at least one transceiver unit (15-20) connected to a second end of each of said communications links (13), swit...
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WO/1988/001821A1 |
Configuration enabling a group of users to hear and break in freely on a conversation to give an answer, around a telephone set, without having to manipulate or hold a receiver. The invention implements means modally different for both s...
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WO/1987/007110A1 |
Signaling and communication system in a hospital in which a plurality of master stations (24) transmit and receive data and audio signals with a plurality of remote stations (18-22) on a plurality of buses (BUS 0 - BUS 7) through a centr...
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WO/1987/006740A1 |
Method and device for transferring signals, particularly analogue signals, between ports distributed between modules of an electronic unit. There are provided a linking line to which all modules are permanently connected and a connection...
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WO/1987/005456A1 |
A device comprising at least two filters with a comb-filter structure but with mutually displaced transmission and stop bands, which form a cascade circuit and thereby amplify the overall loop attenuation. The transmission and stop bands...
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WO/1987/004312A1 |
A telephone intercom device utilises a pair of conductors connected between telephones (38) but not to an external line (12, 14). The intercom device connects the telephone (38) to either the external line (12, 14) or the other telephone...
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WO/1987/001541A1 |
A system that interconnects several units such as telephones to a transmission media such as a coaxial cable (11, 12). An interface (20) between the cable and the phones, divides the cable into channels and interconnects the phones to th...
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WO/1987/001539A1 |
A fiber optic telephone system in which a plurality of subscribers (15-21) with different bandwidth subscriptions are each connected to the system by an optical fiber subscriber connection (11). Use of the subscriber connection beyond th...
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WO/1987/001255A1 |
Speakerphones for both radio and landline telephones. The prior art speakerphones are unable to accommodate high ambient noise environments and allow one party to break in relatively easily on the other party. The invention has: first an...
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WO/1987/000995A1 |
Method for the gain control of an intermediate amplifier used in two-wire connections of a dial telephone network. The invention is also concerned with an intermediate amplifier used in such connections, the direction of the gain of the ...
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WO/1987/000713A1 |
A high rate of exchange of information between a station monitor (10) and each one of multiple associated stations (20, 30, 40) in a key telephone system (100) is economically achieved by using a multipurpose computer (300) in each assoc...
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WO/1986/006570A1 |
A telephone communication system providing substantially all intercom and PABX type features to a plurality of telephone subsets associated with a single pair of telephone wires. Said communication system includes a line interface module...
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WO/1986/004195A1 |
A system for selectively serially coupling a plurality of data stations into a single communications path includes a plurality of tap boxes (TBA) serially coupled into said path. Each station is coupled to a desired associated one of the...
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WO/1986/003912A1 |
A full duplex speakerphone employing adaptive filters and having application in radiotelephone systems. To cancel acoustic feedback echo of the receive signal, a representation of the receive signal generated via an A/D converter (601) a...
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WO/1986/003359A1 |
The subject arrangement provides a last number dialed automatic redialing capability for each line (4100-4152) of a multi-line telephone station set (T-150) or attendant console (T110). This is accomplished by maintaining a centralized l...
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WO/1985/003829A1 |
A method of transmiting isochronous and nonisochronous data in a computer network (10) in which multiple stations have respective input (11) and output (12) ports that are serially coupled together to form a loop includes the steps of: t...
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WO/1985/003827A1 |
A method of transmitting isochronous and nonisochronous data through a computer network (10) in which a plurality of station (S1 to S6 and RT) have respective input (11) and output (12) ports that are serially coupled together to form a ...
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WO/1985/003828A1 |
Communication system and operating method wherein the manner in which all telephone calls are displayed at a station set allows uniform user operations to originate and terminate those calls. This is accomplished by having all calls dyna...
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WO/1985/002746A1 |
Telephone system including a central exchange (EX) to which a plurality of telephone sets (TA) are connected via two-wire lines, for transferring digital information in time-division form between the sets. The system is entirely digitize...
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WO/1984/004436A1 |
A communications switching system for transferring information between a plurality of node information highways (66, 68) and station ports (284, 286), the system (221) comprising a plurality of switches (243) each switch having a station...
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WO/1984/004435A1 |
A communications system that improves upon the availability of communications paths between devices and simplifies the connectivity requirements to communicate data and control information to and from a remote station (11). System nodes ...
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WO/1984/003407A1 |
Speakerphone circuit (100) employing precision peak detectors (115, 125, 150, 155) in which the processing of talk down (TTD, RTD) signals and switch guard (TSG, RSG) signals is partitioned (140) in order to accurately control complement...
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WO/1984/002206A1 |
A telephone switching arrangement (100) comprising a processor and memory is arranged to receive a cartridge (101, 102, or 103) having circuitry and instructions whereby the telephone switching arrangement is selectively changed in accor...
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WO/1984/002207A1 |
A cartridge (101) comprising circuitry and program instructions is added to a processor controlled telephone communication system (100) to selectively change the operating system in accordance with the cartridge used.
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WO/1984/001248A1 |
A telephone line interface (14) which performs the BORSHT functions employs pulse width modulation (36) and eliminates dc in the transformer (28) to reduce the size of the coupling transformer (28) thereby reducing space and costs. The r...
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WO/1983/003939A1 |
A frequency multiplexed intercom system above baseband which uses a 2-wire cable as a bus (210) interconnecting a plurality of stations (200). Simultaneous conferencing among all stations is enabled by having each station modulate identi...
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WO/1983/003512A1 |
A voice-actuated switching system selectively connects multiple microphones (1, 2, N) to an audio line (36) in accordance with the output signal levels from each of the microphones. Comparison circuitry including an analog multiplexer (2...
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WO/1983/002379A1 |
In a digital telephone system, a digital private automatic branch exchange (PABX) (10) has a plurality of digital line cards (22-22') for coupling the PABX (10) two respective digital subscriber sets (44) via subscriber lines. In each di...
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WO/1983/000413A1 |
An interface (22, 28, 36) for connecting data terminal equipment (DTE) to data communication equipment (DCE) is provided which requires no modification to an existing and widely accepted DCE connector (24, 32, 40) and yet which permits d...
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WO/1983/000412A1 |
A time division multiplex loop communication system for voice and data with multiaccess time slot seizure and data transmission capability from all station nodes (11, 12) without changing the idle, nonreserved, status of the seized time ...
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WO/1982/002306A1 |
Hands-free control circuitry (Figs, 2 and 3) for a mobile radiotelephone is described that allows hands-free voice communications in a vehicular environment (Fig. 1) having a high level of ambient background noise. The hands-free control...
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WO/1981/000943A1 |
Duplex amplifyer particularly for interphone with a transmission channel and a receiving channel connected in common to a dual track communication line for duplex traffic in both directions and in the same frequency band. The output (R; ...
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WO/1980/002627A1 |
Improved voice controlled switching system in which a plurality of voice controlled switches are associated with voice signal transmission lines which are provided between at least two stations having a loudspeaker and a microphone for r...
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