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WO/2002/095975A1 |
An echo processing apparatus includes high−pass filter (11) for suppressing a low frequency band component of a reception signal, a loudspeaker (3) for outputting the low band−suppressed reception signal which has passed through the ...
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WO/2002/093774A1 |
In a communications system having incoming communications signals and outgoing communications signals the outgoing communications signals may undesirably include an echo signal derived from the incoming communications signals. Accordingl...
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WO/2002/093895A1 |
The invention concerns a method for adaptive control of multichannel acoustic echo cancellation system comprising N speakers HP¿i? (i = 1, 2, , N), N being an integer not less than 2, and M microphones MC¿j? (j = 1, 2, , M), M being an...
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WO/2002/089458A1 |
The present invention comprises a method for audio/video conferencing including an audio conferencing platform (26), the platform comprising network interface cards (38-40), processing boards (44-46), a CPU (48), a TDM bus (42) and a PCI...
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WO/2002/080422A1 |
Correlation is improved by comparing the output of a multiplier (55) and low pass filter (63) to a first threshold (81) and incrementing a counter (85) when the output from the filter exceeds the first threshold; comparing the output of ...
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WO/2002/078314A2 |
In one embodiment, a mobile station (150) such as a dual-mode, AMPS and CDMA, handset communicates with an AMPS base station (102)in a wireless communication system (100). The mobile station (150) includes an acoustic echo canceller (124...
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WO/2002/078312A1 |
System are provided for blind echo cancellation in wireless signal processors, such as for wireless repeaters (12). A first embodiment of the echo cancellation system (100a) provides iterative echo cancellation (142a) for white signals, ...
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WO/2002/075944A1 |
A speakerphone arbitration method is used to eliminate the effects of telephone circuits. The method assumes that speech energy received at the speaker phone is an echo (410), unless the speech energy has characteristics that indicate it...
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WO/2002/076066A1 |
Method and system are disclosed for cancelling ambient noise in a communication terminal (300). A buzzer (34) serves a dual role both as a ringer for incoming calls or other such event notifications and also as a transducer for transduci...
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WO/2002/073814A2 |
The amplitudes of a signal on the microphone input (21) of a telephone and a signal on the line input (22) of the telephone are compared with each other and with two thresholds (25, 26, 27). The comparisons are sampled and the samples co...
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WO/2002/069611A1 |
In a digital voice enhancement communication system, a plurality of individually customized equalization filters (532, 534) are provided, one for each electrical path between a respective microphone (508, 512) and loudspeaker (514, 510) ...
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WO/2002/060156A2 |
An audio signal (31) is divided into a plurality of bands (32, 33, 34, 35, 36) prior to generating a shadow. The shadow is created by delaying the portion of the audio signal in at least one band by less than fifty milliseconds and combi...
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WO/2002/054719A2 |
In a speakerphone device identification of signals (i.e., voice input or speaker output) in a process for reducing acoustic feedback, in a communication device, is accomplished by adding a signature nois (i.e., an identification mark) to...
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WO/2002/051016A2 |
A circuit comprises a hybrid (100D, 100U) to convert a bi-directional signal into an input signal and an output signal. A signal subtractor (300D, 300U) receives the input signal and subtracts from the input signal an estimated echo sign...
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WO/2002/049336A1 |
The invention relates to a method for setting up voice conferences in a switching network comprising a number (N) of active conference participants (KT¿1? KT¿N?) who are connected to the switching network via one participant module at ...
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WO/2002/043350A2 |
A computer system provides via a network (12) at least one telephone feature (11) to a telephone (3) of a user (1). The computer system receives instructions regarding the telephone feature (11) via the network (12) from a graphical user...
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WO/2002/039709A1 |
The invention proposes a variable step-size adaptation control method for acoustic echo cancellation digital filters for handset and hands-free telephone terminals. The variable step-size integrates a double-talk detector, an echo-path c...
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WO/2002/032356A1 |
An automatic gain control for a cabin communication system improves the clarity of voice spoken within a movable interior cabin. The automatic gain control includes a microphone (102) for receiving the spoken voice and the ambient noise ...
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WO/2002/030099A1 |
The invention concerns a method for attenuating echo implemented in a multisensor (11¿m?) sound pick-up device (8) forming an antenna (10) and a sound reproduction device (12). The method consists in subjecting the signals y¿m?(t) outp...
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WO/2002/029567A1 |
An intra-vehicle communications system in a mining vehicle monitoring system. A status sensor (36), status radio transmitter (38) and power source (40) are located adjacent to a portion or component of the vehicle to be monitored and a s...
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WO/2002/025907A1 |
A virtual private branch exchange (VPBX) (115, 120) enables plural individuals to be associated with a single telephone number. When a call is received (6020), the VPBX retrieves a profile based on the called number (6030). The profile i...
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WO/2002/023755A2 |
Real and imaginary components of the discrete Fourier transform (DTF) of the residual echo in an acoustic echo cancellation system are separately estimated using mapping functions derived without an assumption of statistical independence...
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WO/2002/023880A1 |
A device (1), for remote door opening, comprises a door unit (2), with at least one signal generator (7) and a release mechanism. Furthermore, the device (1) comprises a remote control unit with a telephone receiver (3). The door unit (2...
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WO/2002/021807A2 |
A two-way communication device comprises a microphone (4) and a loudspeaker (8). THe device determines the volume at which the device reproduces the signals it receives, e.g. by the setting of a volume control (16) or via an energy level...
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WO/2002/021817A2 |
A method and system is provided for eliminating acoustical feedback in a system. The method determines a parameter for at least one notch filter, adjusting the notch filter based on the parameter, processing the digital signals through t...
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WO/2002/011414A2 |
The invention provides that when switching over between a hand-held operation (normal operation) and a hands-free talking operation, the loudness level is successively increased to a preset hands-free talking loudness. When switching ove...
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WO/2002/009434A1 |
The invention relates to an electronic digital door opener, comprising a digitization, recording and control block (2) that is connected between the street plate (1)and the interior plates (3, 3', 3''). Said block (2) has sound recording...
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WO/2002/003563A1 |
An echo suppressor for bi-directional communications includes an echo canceller and a residual echo suppressor having variable gain. The gain of the residual echo suppressor is controlled based on a characteristic, such as the estimated ...
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WO/2001/093554A2 |
A method is described, wherein multiple input signals are subjected to a combination process of adaptive beamforming and adaptive echo cancelling, and wherein for each of the input signals an individual processing history of adaptive ech...
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WO/2001/089184A1 |
A communications device employs noise-adaptive transmit signal gain that takes echo cancellation into account so that a remote listener engaged in conversation with a local user of the communications device is not subjected to overly lou...
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WO/2001/080595A1 |
An improved telephone system (10) over a single telephone line within a residence or other building is disclosed, supporting exchange features and enabling easy expansion for multiple external lines. The existing telephone wiring is used...
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WO/2001/080439A1 |
A hybrid echo suppresser and associated methods of use provide echo suppression in a bi-directional communications system, while minimizing desired-voice signal disruption. The hybrid echo suppresser includes a linear echo canceller (LEC...
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WO/2001/069371A2 |
According to the invention, at least one acoustic output is connected to at least one acoustic input of a computer appliance having a multiway acoustic output and input system. The acoustic signal that is guided via said connection is su...
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WO/2001/060029A1 |
An external speakerphone accessory system (Fig. 11) for a telephone, such as a LAN telephone, which enables the telephone user to place the speakerphone in a location that is convenient for multiple users, and which is not necessarily co...
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WO/2001/059994A1 |
A LAN telephone (6) which makes voice telephone calls over a local area network (LAN) data network (1). Acoustic voice sounds are digitally encoded and transmitted as simultaneously receives LAN data packets and decodes them, translating...
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WO/2001/056263A1 |
A system and method for cancelling an echo signal. An input waveform is provided to an acoustic processor, and a determination is made whether the input waveform includes information representative of an echo signal. If the input wavefor...
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WO/2001/054296A1 |
A sound communication device comprises a control CPU to output a speaker amplification value corresponding to the speaker volume adjusted by a terminal user using a volume adjusting means and an echo processor to reduce the echo mixed in...
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WO/2001/050714A1 |
A telephone includes a first channel having a microphone input (71) and a line output (72), a second channel having a line input (73) and a speaker output (74), and each channel having a plurality of band pass filters (101, 104/102, 103)...
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WO/2001/045375A1 |
The invention relates to a real time processing and management method for canceling out the echo between a loudspeaker (HP) and a microphone (M) of a computer terminal. Said method consists of establishing the loudspeaker signal or the m...
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WO/2001/043413A1 |
The invention concerns a device for processing echo in a communication system at a terminal comprising a first transducer (4) and a second transducer (5), said echo processing device (1, 101, 201) itself including an adaptive echo cancel...
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WO/2001/035603A2 |
Echo canceling method including the steps of determining an Euclidean norm of an echo-replica signal, determining an Euclidean norm of an input signal, determining a gradient step size, correcting the coefficients of an adaptive filter, ...
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WO/2001/026339A1 |
A complementary comb filter (12) includes a plurality of band pass filters (13-17) and a plurality of notch filters (21-25), wherein the notch filters have the same center frequencies as the band pass filters or the same center frequenci...
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WO/2001/026352A1 |
A low pass limited, low frequency pseudo-random noise signal (16) is added (13) to the input signal (11) for tagging the input signal in order to facilitate correlation with an echo.
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WO/2001/022601A2 |
An echo is cancelled from a composite signal (S2) by providing a coarse phase adjustement (COARSE, Fig. 1), a fine phase adjustment (FINE Fig. 1), an amplitude correction (41), and then subtracting (42) the phase shifted signal (S2') fro...
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WO/2001/019062A1 |
A communication device having residual echo suppression includes an echo canceller (22) and a residual echo system (50, 52). The echo canceller cancels (30) most of an echo of a far end signal found in a microphone signal and provides an...
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WO2000072556A9 |
A full duplex speakerphone system (48) and a method of detecting a valid near-end talker component within an outgoing signal utilize a near-talker estimator (50) that produces a near-talker energy estimate using a spectrum analysis. The ...
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WO/2001/013615A2 |
The invention relates to a method for transmitting voice signals within a building wherein structured cabling is provided. The cabling is especially provided with a switch device (3) that is connected to a plurality of connections (5) vi...
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WO/2001/010102A2 |
An echo cancellation device (ECD) comprises an echo canceller (EC) including a transfer function estimator (EST, H) and a subtractor (ADD) and a residual echo suppression device (G, ADD2). The residual echo suppression device (G) compris...
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WO/2001/006745A1 |
A system for communicating messages over a network of computers in real time is described. The messages include broadcast audio or video data for delivery to multiple computers, and intercom audio or video data for delivery between compu...
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WO/2001/003316A1 |
A communications system (10) transmits a near end digital signal using a compression code comprising a plurality of parameters including a first parameter. The parameters represent an audio signal comprising a plurality of audio characte...
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