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WO/1995/001681 |
A full-duplex audio network (10) connects a partially-enclosed near-end space (12) and a partially-enclosed far-end space (14). The full-duplex audio network (10) includes a near-end communication device (16) that is located in the parti...
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WO/1994/028667 |
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/1994/024807 |
A circuit configuration in a multimedia network (10) simulates an actual meeting room where the conferences between two or more people may be held. This facilitates the creation in the network (10) of flexible, long-term multimedia confe...
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WO/1994/023508 |
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/1994/022257 |
A method and system is provided for conducting secure power line carrier communications in full duplex over the power lines of a building. The method employs system control logic for (A) multiple extension arbitration logic, (B) privacy ...
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WO/1994/018780 |
A telephone adapter (21), comprising an outlet (32) for coupling to a telephone outlet socket having a d.c. voltage across a telephone line connected to a pair of terminals thereof, an inlet (34) for coupling to a telephone extension uni...
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WO/1994/017603 |
In a speech communication system equipped with an echo canceller (30) for offsetting echoes reaching a microphone (14) from a speaker (13) for hand-free speech, the echo canceller (3) includes a volume controller (36) for changing the so...
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WO/1994/011994 |
With a simple circuit, it is possible to shift the image position freely without degradation of the image quality. The apparatus comprises a synchronizing signal separation circuit (3) for separating the horizontal synchronizing signal a...
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WO/1994/010788 |
A system and method of synchronizing visual indicators in digital telephone including at least one attached auxiliary device. Visual indicators on the base telephone and the auxiliary device are first set to an initial state. Later, as v...
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WO/1994/008418 |
An echo canceller and method for cancelling in a return channel signal an echoed receive channel signal where the echoed receive channel signal is combined by an echo channel (142) with an input return channel signal. A control unit (152...
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WO/1994/001957 |
A method is disclosed for maintaining loop stability between a transmit and a receive path of a speaker phone which is capable of operating in either a full-duplex or a half-duplex mode. Loop stability is maintained and normal operation ...
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WO/1994/000944 |
The apparatus and method for detecting the presence of ringer signals in a telephone which samples the incoming telephone signals within a prescribed time interval, windows the signals, and computes a set of auto-correlation coefficients...
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WO/1993/025973 |
A two-way audio communication system is designed to allow basic audio communication between two users on a common computer network (10). The audio communication system of the present invention is designed to work in the background of the...
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WO/1993/021034 |
The invention concerns a communications device, in particular a two-way intercom or similar system, for a vehicle (1) with a microphone (5) located inside the vehicle (1) and a loudspeaker (11 or 15) located outside the vehicle (1), an e...
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WO/1993/017510 |
An improved echo cancelling device (18) for reducing the effects of acoustic feedback between a loudspeaker and microphone in a communication system. The device includes an adjustable filter (50) for receiving a loudspeaker signal and ge...
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WO/1993/014611 |
A signal distribution and communication arrangement controls the broadcast of different types of signals through speakers (A-D) located in various zones. The system includes a telephone (105) interfaced with a door speaker (104) controll...
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WO/1993/012621 |
An intercom system has at least two stations (T1, T2) composed of each of an emitter (S1, S2) and a receiver (E1, E2). The intercom system further has a tone generator (P) that transmits tones to the receiver (E2) of the station (T2) wit...
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WO/1993/007703 |
An audio processing system (100) for use in a teleconferencing system (10) utilizes complementary comb filters (42, 52, 220, 320) in combination with an echo suppressor (210, 310) and/or a frequency scaler (60, 120) to substantially impr...
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WO/1993/006679 |
A handsfree telephone circuit has separate transmit and receive audio paths for connection to a microphone and speaker respectively. The circuit comprises a controllable attenuator in each of said transmit and receive paths, an attenuato...
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WO/1992/021198 |
A preferred duplex hands-free communication device includes a speaker (106) for transmitting a signal received from a remote source, first and second microphones for transducing received acoustical signals wherein the first microphone (1...
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WO/1992/020170 |
A voice communication device provided with a chirp signal generating means and a training control means in addition to an echo canceler for canceling acoustic echoes generated in a hand-free speech space. The chirp signal generation mean...
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WO/1992/019048 |
The invention relates to a device for processing the residual echo of a cancelling device which cancels the echo of a digital speech signal. The device is comprised of an echo cancellor (1) comprising a self-adaptive filter (FA) receivin...
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WO/1992/017988 |
A telephone set provided with a plurality of handsets connectable with different external office lines respectively, and with the same external office line. Provided are dialing buttons (5) and a circuit (26) for sending out a dial signa...
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WO/1992/015167 |
A telephone adaptor unit (6) for a telephone set connectible, with other like telephone adaptor units for other telephone sets, between the respective telephone set and a common telephone line (2), includes a first switching device (14) ...
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WO/1992/012589 |
A voice-band receive amplifier for telephone handsets that mitigates loud sidetone and acoustic sing. A receive channel (30) with amplification and voice-switched attenuation is disposed between a receive port of a telephone network (80)...
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WO/1992/012583 |
An echo cancelling device (15) for reducing acoustic feedback between a loudspeaker (32) and microphone (10) in a full duplex communication system such as a telephone conferencing system. A whitening filter (14) flattens the microphone s...
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WO/1992/012606 |
A signal distribution and communication arrangement (100) controls the broadcast of different types of signals through speakers located in various zones (A-D). The arrangement includes an audio receiver circuit (102) which responds to a ...
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WO/1992/005643 |
A distributed digital telephone system is provided wherein a plurality of telephone consoles (34) have instant access to a plurality of telephone lines (31) wherein in all of the connections within such a system are non-blocking. The sys...
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WO/1991/020149 |
This invention relates to an echo canceller (EC) such as for use in a full duplex radio. The echo canceller comprises: an output path (10) for outputting desired signals; an input path (12) for receiving desired signals together with und...
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WO/1991/017617 |
A speech-transmission system with a multiplicity of speech stations for multi-channel transmission over one or a few lines can be produced, in the form of integrated circuits, by means of synchronized speech stations (1), which have a di...
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WO/1991/016796 |
A key telephone system (120), having ports (22) for connection to telephone lines of a telephone exchange and ports (12) for connection of terminal apparatus including key telephone sets (125), is provided with the ability to distinguish...
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WO/1991/013508 |
A process to reduce the howl condition in a radiotelephone when the microphone picks up audio from the speaker. The condition is detected by first lowering the speaker volume (103) and measuring the microphone volume for a corresponding ...
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WO/1991/012683 |
This invention relates to a speaking device having a hand-free conversation function which comprises an echo canceler (3) that can cancel the echo given by the direct acoustic coupling between a speaker and a microphone caused by a syste...
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WO/1991/011873 |
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/1991/011888 |
A key telephone device in which ports for connecting terminals are of a 2-pair (4-wire) type, one pair (two-wire) is connected to digital terminals and the other (two-wire) connected to analog terminals together, and which has a change-o...
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WO/1991/011060 |
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/1991/003116 |
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/1990/013196 |
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/1990/006649 |
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/1989/011186 |
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/1989/009518 |
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/1989/006463 |
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/1989/006076 |
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/1989/005068 |
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/1989/004573 |
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/1989/003139 |
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/1989/001277 |
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/1988/006823 |
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/1988/005240 |
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/1988/004501 |
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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