| Document |
Document Title |
|
WO/1996/011557A1 |
This invention relates to a telecommunications system including a plurality of mobile telephones. The telecommunications system has a switch network including: data storage units (HLR) for storing connection data relating to respective m...
|
|
WO/1996/008879A1 |
An apparatus for echo characterization or measurement includes a frequency domain adaptive filter for converging a plurality of filter coefficients based upon transmit and receive frequency domain transforms. The frequency domain adaptiv...
|
|
WO/1996/008103A1 |
The invention concerns the field of telecommunications and has particular reference to a method and device for multilingual telecommunications. The device comprises fixed call terminals (1) and a control station (2) connected to a networ...
|
|
WO/1996/003846A1 |
A Cabin Distribution System (CDS) provides the necessary interfaces between each of the telephone units used by the passengers on the airplane and a Cabin Telephony Unit (CTU). The CTU is an intelligent telephony switch that controls and...
|
|
WO/1996/002998A1 |
It is the aim of the invention to provide a door intercom and bell system making it possible to provide additional functions besides the bell and largely avoid additional wiring. This aim is achieved in that the keypad and the call syste...
|
|
WO/1995/035622A1 |
The present invention is directed to apparatus and methods for reducing sidetone feedback in a portable wireless telephone system by positioning the speaker (106) and the microphone (108) to reduce acoustic feedback and by controlling th...
|
|
WO/1995/026093A1 |
A communicating system (1) comprising a central controller (8) connected to, and for control of, an external telephone line (2), an internal telephone line (6), and an internal signal line (4); a plurality of telephone stations, each com...
|
|
WO/1995/024108A1 |
In order to make the accessories (MTF-ZE1, ZE2, ZE3...) for a telecommunications system automatically addressable in a telecommunications arrangement with terminals (MTF), in which system the accessories to be addressed have no individua...
|
|
WO/1995/023477A1 |
A method and apparatus are described for detecting doubletalk in an acoustic echo canceller. In the present invention, doubletalk detector (42) examines the spectral characteristic of the near-end audio signal computed by FFT element (40...
|
|
WO/1995/019085A1 |
An echo-cancelling system and method uses an echo estimate (714) to modify the error signal (716) which is obtained by the difference between an echo signal (706) and the echo estimate (714). The modified error signal (718), rather than ...
|
|
WO/1995/015643A1 |
A telecommunications network (120) is provided with adaptive gain control (AGC) of the voice signals in network (120). Network (120) includes an input (12) for receiving a voice signal, an output (14) for receiving the voice signal, and ...
|
|
WO/1995/010927A1 |
An audio distribution system includes a main control unit for distributing audio signals to a plurality of zones using a remote programming unit and a plurality of zone input panels for commanding the types of audio signals to be routed ...
|
|
WO/1995/010164A1 |
A microphone system for use in an environment where an acoustic source emits energy from diverse and varying locations within the environment. The microphone system has at least two directional microphones (MA, MB, MC, MD), mixing circui...
|
|
WO/1995/006986A1 |
The present invention provides a fast affine projection adaptive filter (100) for frequent parameter updating and fast convergence with low complexity. The adaptive filter (100) generates an echo estimate signal based on an excitation si...
|
|
WO/1995/006382A2 |
A voice activity detector is described suitable for use in an echo suppressor. It comprises a whitening filter (19) for levelling the spectrum of the audio signal on the transmit path to provide a levelled signal and decision means (20) ...
|
|
WO/1995/005047A1 |
Our audio processing system for use in teleconferencing systems includes a microphone (1-25), receiver (1-26), and substantially the same comb filter (1-42) and frequency scaler (1-60) at each station for reducing acoustic echo and incre...
|
|
WO/1995/001681A1 |
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...
|
|
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...
|
|
WO/1994/024807A1 |
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...
|
|
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...
|
|
WO/1994/022257A1 |
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 ...
|
|
WO/1994/018780A1 |
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...
|
|
WO/1994/017603A1 |
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...
|
|
WO/1994/011994A1 |
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...
|
|
WO/1994/010788A1 |
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...
|
|
WO/1994/008418A1 |
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...
|
|
WO/1994/001957A1 |
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 ...
|
|
WO/1994/000944A1 |
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...
|
|
WO/1993/025973A1 |
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...
|
|
WO/1993/021034A1 |
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...
|
|
WO/1993/017510A1 |
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...
|
|
WO/1993/014611A1 |
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...
|
|
WO/1993/012621A1 |
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...
|
|
WO/1993/007703A1 |
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...
|
|
WO/1993/006679A1 |
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...
|
|
WO/1992/021198A1 |
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...
|
|
WO/1992/020170A1 |
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...
|
|
WO/1992/019048A1 |
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...
|
|
WO/1992/017988A1 |
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...
|
|
WO/1992/015167A1 |
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) ...
|
|
WO/1992/012589A1 |
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)...
|
|
WO/1992/012583A1 |
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...
|
|
WO/1992/012606A1 |
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 ...
|
|
WO/1992/005643A1 |
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...
|
|
WO/1991/020149A1 |
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...
|
|
WO/1991/017617A1 |
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...
|
|
WO/1991/016796A1 |
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...
|
|
WO/1991/013508A1 |
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 ...
|
|
WO/1991/012683A1 |
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...
|
|
WO/1991/011888A1 |
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...
|
