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WO/1998/004079A2 |
A system and a method for echo suppression which use two or more microphones (22, 36 and/or 68) for beamforming of an echo signal (L') corresponding to an incoming speech signal (L) that is output by a loudspeaker (20). The outputs of th...
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WO/1998/002999A1 |
A network of processing devices (305, 306, 307) is arranged to communicate by means of packets having an addressing header and a data portion. Within the network, audio telephony is implemented. A signalling packet is sent from a source ...
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WO/1997/049196A2 |
The invention relates to an acoustic echo suppressor and a non-linear processor for an echo canceller in a 4-wire data transmission network. An echo canceller is typically controlled by comparing the power levels (PWRIN, PSIN) of the nea...
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WO/1997/048197A2 |
The communications system includes a hybrid fiber/coax distribution network. A head end provides for downstream transmission of telephony and control data in a first frequency bandwidth over the hybrid fiber/coax distribution network and...
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WO/1997/045994A1 |
The telephone system of the invention comprises telephones and a bus interconnecting the telephones. The bus carries baseband signalling of a radio system and comprises a plurality of channels. At least one telephone may be connected to ...
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WO/1997/045995A1 |
In an acoustic echocanceller (6), an estimate of an echo signal is determined by an adaptive filter (10) and is subtracted from the input signal by a subtracter (14). The spectrum estimator (12) determines the frequency spectrum of the e...
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WO/1997/038552A1 |
In a video conference facility, an echo cancelling device is provided which comprises an adaptive finite impulse response filter (38) operable to sample the input signal to a loudspeaker (30) and to model, on the basis of that signal, th...
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WO/1997/036390A1 |
A communication system for coupling telephony or other signals to a broadband network such as a CATV network. The system transmits a multiplex of telephony signals in the forward band of the broadband network, with individual signals dir...
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WO/1997/034440A1 |
A synchronous digital communications network comprises a plurality of node devices (301, 302, 304, 305) linked by a plurality of link devices, which communicate by means of an optical aggregate. An engineering orderwire facility is provi...
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WO/1997/033419A2 |
An adaptive volume controlled radiotelephone system includes a microphone, a loudspeaker, a transceiver, and an adaptive volume control. The micophone generates an output electrical audio signal in response to sound, and the loudspeaker ...
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WO/1997/031439A1 |
Systems for attenuating the influence of sound waves generated by audio output devices (26) on output signals from a plurality of input devices (30) in an audio interface garment (22) are disclosed. In one embodiment, input signals which...
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WO/1997/030558A1 |
A digital button telephone system which is connected to an analog public network (NW) having a function of transmitting a calling signal including the identification information of the caller through a subscriber line (CO line), incorpor...
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WO/1997/030555A2 |
A multiple application switching platform includes a switch having a distributed open architecture and incorporating redundancy for enhanced fault tolerance. The switch includes at least one shelf having a midplane (1) containing message...
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WO/1997/028614A1 |
A system and method for performing echo cancellation in a communications network including a bi-directional two-wire communication line, and a four-wire communication line having a transmit path and a receive path. The system includes a ...
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WO/1997/027697A1 |
A portable cellphone (200), with or without its docking system (150') is integrated as an accessory to a host system such as by providing a terminal interface (terminal mode) to the host for the purpose of user interface and control of t...
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WO/1997/027550A2 |
The communication system includes a hybrid fiber/coax distribution network. A head end provides for downstream transmission of telephony and control data in a first frequency bandwidth over the hybrid fiber/coax distribution network and ...
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WO/1997/024853A2 |
An efficient and cost effective method and apparatus to control echo in long distance telephone communication systems are provided. A first multiple stop band filter is connected to a first transmission path. The first multiple stop band...
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WO/1997/024804A1 |
A measure of a degree of convergence in an adaptive filter arrangement is derived from the comparison of an amount of adaptation occurring in the adaptive filter arrangement, over a predetermined period of time, with a normalizing value ...
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WO/1997/021280A1 |
The present invention relates to a method and an arrangement for reducing acoustic echoes in connection with a telephone call, in which at least one part is using a handsfree telephone (10). The inventive idea is basically to implement a...
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WO/1997/019533A1 |
A system for the connection of any standard analog terminal subscriber telephone equipment, e.g. analog telephone (40), facsimile (42), and analog computer modem devices (44), to be utilized concurrently at a location interior to the bui...
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WO/1997/015137A1 |
A switching system for inclusion in domestic premises (2) includes a master socket (11) for connection to network termination equipment (e.g. wall socket) (6) and for connection to a plurality of slave sockets (12) each of which may be c...
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WO/1997/014242A2 |
In a method for optimizing the use of a telephone network including the steps of assigning telephone numbers to a first group of users within a geographical area, assigning telephone numbers to a second group of users outside of said geo...
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WO/1997/011533A1 |
Two or more microphones (10, 12) are mounted in an environment that contains an equal or lesser number of distinct sound sources. Acoustic energy from each source, with its attendant echoes and reverberation, impinges on each microphone....
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WO/1997/011550A1 |
When two or more telephone sets are in use on the same subscriber's loop, their activities may not be properly detected or monitored by the central office switch. The present invention provides a method of and an apparatus for coordinati...
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WO/1997/011551A1 |
When two or more telephone sets are in use on the same subscriber's loop, their activities may not be properly detected or monitored by the central office switch. The present invention provides a method of, and an apparatus for, coordina...
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WO/1997/008882A1 |
A method (501, 502) of detecting voice in an audio signal comprises the steps of determining an average peak value (703, AP) representing an envelope of the audio signal, determining a running instance of audio signal standard deviation ...
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WO/1997/007624A1 |
An echo suppression apparatus has a number of sensors, such as microphones, disposed in an environment. Each sensor receives a signal. Each of the signals includes a component derived from an echo source in the environment. The echo sour...
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WO/1997/004577A1 |
A loudspeaking telephone network has an echo cancelling device (EC) for serving a number of telephones. Each telephone has a microphone (MIC) and a loudspeaker (LS) which are separately connectable by transmission channels to supply voic...
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WO/1997/002671A2 |
A communication system for coupling telephony or other digital networks to a broadband network such as a CATV network. The system transmits a multiplex of telephony signals in the forward band of the broadband network, with individual si...
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WO/1997/002664A1 |
An echo canceller (10) includes an analysis filter bank (24) for dividing a send-input signal (SI) and a receive-input signal (RI) into subband send-input signals (SC1-SC16) and subband receive signals (RC1-RC16). Each of the subband rec...
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WO/1996/042156A1 |
Ring communication system (Figure 1) using ISDN including terminal adapter hardware and associated software that can be combined with a general purpose computer and used to provide a work station or party unit which can be linked togethe...
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WO/1996/042142A1 |
The invention relates to a method and arrangement for eliminating acoustic echo generated in a mobile station in a mobile communications system. According to the invention, an echo suppressor is placed on the side of the mobile network f...
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WO/1996/041497A1 |
A wearable portable entertainment and personal communication system (50) provides high quality sound, particularly at low audio frequencies, and which does not block or attenuate environmental sounds is disclosed. In a first embodiment, ...
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WO/1996/041496A1 |
A wearable portable entertainment and personal communication system (50) provides high quality sound, particularly at low audio frequencies, and which does not block or attenuate environment sounds is disclosed. In a first embodiment, a ...
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WO/1996/038973A1 |
A telephone having a method and apparatus for increasing the intelligibility of the loudspeaker output and for echo cancellation. The telephone includes an intelligibility booster for processing a speech input signal to generate an intel...
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WO/1996/034484A2 |
The invention relates to a system and method for monitoring activity remotely, and especially, but not exclusively, for monitoring services provided at a residential or business property. The system comprises a telephone device and a mes...
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WO/1996/032804A1 |
The invention relates to a voice communication device (20) and to a method of recording and transmitting voices and replaying the voices in full duplex. The invention relates more specifically, but not exclusively, to a conference teleph...
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WO/1996/027971A1 |
A conversion system using a lookup table of adjustement values for converting non-linear, logarithmic pcm codes between attenuated and unattenuated formats. A computer accesses attenuated pcm codes from a compression device, such as that...
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WO/1996/027255A1 |
A hands-free telephone terminal including a speaker (HP), a microphone (MI) and speaker gain control means (AUG, DIM, PP). A speaker gain correction method cyclically determines a listening comfort index and derives gain modification par...
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WO/1996/026592A1 |
An echo canceling loudspeaker telephone includes a loudspeaker which produces a sound pressure wave in response to an input signal which is applied to an audio input thereof. This sound pressure wave includes a desired linear component w...
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WO/1996/023384A1 |
An echo canceller including an adaptive filter receiving the coefficients of a direct discrete transform in the frequency domain, said coefficients being calculated over a series of blocks in an input signal, and driving, via an inverse ...
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WO/1996/022651A1 |
A method and apparatus for reducing the echo in a hands-free digital cellular communication system are presented. Acting upon speech signals being presented in the downlink, uplink speech frames generated by the hands-free communication ...
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WO/1996/022652A1 |
A business telephone system employs digital signal processing in a digital telephone having a serial link (22) for connection to a general purpose computer. The Smart Phone (13) is the central intelligence for the system, which may utili...
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WO/1996/021306A1 |
A telephone extension unit (25), permitting discrimination between a locally and remotely initiated call and producing corresponding outgoing and incoming call discrimination signals, and having a call signal detector (33) for detecting ...
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WO/1996/021313A1 |
The echo suppressor is intended to be placed between a free-hand acoustic interface and a communication network. It comprises a plurality of processing channels mounted in parallel and each affected to one of a plurality of adjacent subb...
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WO/1996/021312A1 |
The invention concerns a "hands-free" device (1) for a digital communications terminal, the device having a transmitted-signal and received-signal path (3, 14) both fo which include adjustable attenuation stages (4, 13) controlled by an ...
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WO/1996/019897A1 |
A telecommunications system and method for use on aircraft and other vehicles. One or more token ring local area networks (TR0-TRN) are utilized to provide a telecommunications link between a plurality of telephone units (12, 14) and a t...
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WO/1996/018270A2 |
An apparatus for interfacing at least one landline telephone service, at least one wireless cellular-type telephone service, at least one cellular-type wireless telephone and at least one standard telephonic type communication device thr...
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WO/1996/016501A1 |
An improved telephone interface device (10a) communicatively couples a local telephone set (8) to an inside telephone wire (6) which is coupled to an outside telephone wire (4) to a service provider (1). The interface (10a) includes a br...
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WO/1996/014694A1 |
The present invention is directed to an apparatus (such as a speakerphone (100)) and method for establishing a full-duplex signal path immediately upon connection of the apparatus to an external communication path (102) (such as an exter...
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