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WO/2001/002929A2 |
A communications system (8) transmits digital signals using a compression code comprising a plurality of parameters including a first parameter. The parameters represent an audio signal comprising a plurality of audio characteristics, in...
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WO/2001/003317A1 |
A communications system (10) transmits digital signals using a compression code comprising a predetermined plurality of parameters including a first parameter. The parameters represent an audio signal comprising a plurality of audio char...
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WO/2001/001665A2 |
The present invention includes a communication system comprising a first transducer (106) that detects and converts external audio signals into internal electronic signals formatted to be compatible with internal operations of the commun...
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WO/2000/077492A2 |
The invention provides a key system unit (106, 108, 110) comprising a first interface (204) suitable for connection to a plurality of local terminals (122) and a control unit (202) coupled to the first interface. The control unit is oper...
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WO/2000/076179A1 |
A system for processing audio signals in two channels (11, 29 and 31, 49) wherein each channel includes a plurality of band pass filters (12-16, 32-36) for dividing the signal in each channel into a plurality of bands and a plurality of ...
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WO/2000/076176A2 |
The present invention relates to a loudspeaker volume control arrangement for a telephone having a loudspeaker and a microphone which controls the loudspeaker volume of the telephone based on the estimated distance between the microphone...
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WO/2000/076195A1 |
Processing complexity in an acoustic echo canceller can be reduced by partitioning the input near-end and far-end signals into respective pluralities of frequency subband signals. Also, due to the complex conjugate symmetry of convention...
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WO/2000/076081A2 |
In methods and apparatus for echo cancellation using sub-band adaptive filtering, the bandwidth of each of a number of sub-band analysis filters, as well as the bandwidth of each of a number of synthesis filters, is increased as compared...
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WO/2000/074362A2 |
Adaptive filtering algorithm training signals incorporate adaptation-enhancing signals having properties, such as spectral whiteness and rapidly decaying auto-correlation between samples, which allow the adaptive filtering algorithms to ...
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WO/2000/074361A1 |
An echo in an electrical audio signal is reduced by converting a first acoustic signal into the electrical audio signal, generating an echo estimate signal from a loudspeaker signal, and generating an error signal that is a difference be...
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WO/2000/074363A1 |
The invention relates to a method and to a device for suppressing background noise and echoes in voice or image signals which consists of a plurality of signal estimators or signal filters S¿1?, S¿2?, ..., S¿N?, and a combinatorial el...
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WO/2000/074350A2 |
To optimize the performance of a device, such as a mobile telephone, that may be coupled to any of a variety of hands-free adapters, each characterized by a particular quality of performance, the device receives self-identifying informat...
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WO/2000/074379A1 |
The invention provides a method and a device for use in videotelephony. Said method and device enable additional image information that is different from the normal image information, for example advertising, to be switched onto the disp...
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WO/2000/072565A1 |
An enhanced near-end voice signal may be generated in a hands-free environment by receiving an audio signal, generating an estimated acoustic echo signal, and generating a processed signal by removing the estimated acoustic echo signal f...
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WO/2000/072564A2 |
The invention relates to a device for compensating echoes that are produced in a system which comprises at least one loudspeaker (1), a transmission room (3) affected by an echo and at least one microphone (2) (loudspeaker-room-microphon...
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WO/2000/072566A1 |
In methods and apparatus for echo cancellation, an adaptive filter reference signal (e.g., a far-end audio signal intended for input to a loudspeaker) is processed by a whitening filter before being input to an echo-cancelling adaptive f...
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WO/2000/072567A1 |
A multiple channel steered spatialised signal is generated from a signal input (12) modified according to respective spatialisation gain functions (g¿1?, g¿2?) to generate a plurality of audio channels (x¿1?(t), x¿2?(t)). An echo can...
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WO/2000/070854A1 |
In methods and apparatus for echo cancellation, a noise estimate is selectively added to a downlink communications signal to improve the convergence speed and stability of an echo-canceling adaptive filter. The added signal content enabl...
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WO/2000/070853A2 |
In handsfree communications devices including a linear echo or noise canceler, both analog and digital gain factors are adjusted in response to user volume control inputs, the analog gain factor being frozen during active communications ...
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WO/2000/065817A2 |
The invention relates to a hands-free device (1) of a telephone station with a sender signal attenuation device (15), a receiver signal attenuation device (17) and a attenuation control device (23). The inventive hands-free device has a ...
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WO/2000/065818A1 |
Method and apparatus for detecting far end speech in a telephone apparatus. A speaker (14) reproduces far end sound from a far end signal, when received by the telephone apparatus. A microphone (12) generates a near end signal from near ...
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WO/2000/060830A2 |
The invention relates to a mobile telephone which so as to permit hands-free operation comprises means (11) for echo cancellation and means (12) for the dereverberation of the signal supplied by a microphone (2) of the mobile telephone. ...
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WO/2000/060841A1 |
Echo is canceled in a communication device including at least one microphone and a loudspeaker. Signals directed to the loudspeaker are filtered through at least one first filter. The filtered signals are subtracted from signals received...
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WO/2000/057377A1 |
Security aware appliances (5) include storage means for receiving identity signals from a security unit (72). On connection of the apparatus to an electricity supply (6) signals are sent to the security unit (72) by the security aware ap...
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WO/2000/056071A1 |
An adapter (42) for connecting a telephone (52) to a telephone wire (40) has a subscriber line interface circuit (SLIC 113) with a jack for connecting a telephone to the SLIC, a line interface (110) for coupling to a telephone line, a si...
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WO/2000/056036A2 |
There is disclosed an audio terminal (10) and a method for operating in uncontrolled audio environments, the audio terminal (10) having an echo suppression unit (20) for reducing acoustic feedback (18). The echo suppression unit (20) inc...
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WO/2000/052917A1 |
The invention relates to a device and a method for suppressing noise in telephone devices, especially devices with hands-free talking equipment, comprising a level discriminator. An additional filter with a group delay of less than 2 ms ...
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WO/2000/041330A1 |
An echo canceller system (36) and a method of filtering an outgoing signal utilize a volume compensator (38) that operates in tandem with a primary adaptive filter (14) to cancel echo due to a change in echo response of the system within...
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WO/2000/039991A1 |
Adaptive gain control techniques provide correctly adjusted audio signal levels during the entirety of an Internet telephony conversation and are resilient to background noise and loudspeaker echo. Disclosed techniques can account for mu...
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WO/2000/033553A2 |
A control interface protocol governs communications in a satellite telephone system. The satellite telephone system comprises a radio antenna unit (RAU) (124) and a plurality of desksets (128A, 128B, 128N) connected to the RAU (124). An ...
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WO/2000/025441A1 |
Frequency domain nonlinear processing techniques are applied in the context of echo suppression. According to exemplary embodiments, the filtering characteristic of a nonlinear processor is dynamically adjusted by comparing the power spe...
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WO/2000/018098A1 |
A method and system for the reception, conversion and distribution of wireless communication signals received from such communication devices as PCS, Cellular, and Satellite over AC power lines commonly found within a building, office, h...
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WO/2000/016497A1 |
The Least Mean Square (LMS) and Normalized LMS (NLMS) algorithms commonly employed in adaptive filters of echo cancelers are further optimized. Finite impulse response (FIR) filters are used to estimate a transfer function of an echo cha...
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WO/2000/014731A1 |
An apparatus and method for suppressing vibration noise from a voice signal transmitted via a hands-free communications accessory located in a vehicle, wherein the steps of the method include: sensing vibrations experienced by the vehicl...
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WO1999035608A9 |
An image capture, conversion, compression, storage and transmission system (12) provides a data signal representing the image in a format and protocol capable of being transmitted over any of a plurality of readily available transmission...
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WO/2000/011857A1 |
A filter (10) passing only desired frequencies is selected according to a desired level of service for copper lines. At a point of access between a loop plant (2) and Central Office (1), the filter (10) is interposed in series over a tel...
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WO/2000/008836A1 |
The invention concerns a device for processing digital data comprising a module (M2, M3) producing on a data vector of the frequency domain Z(k), wherein k varies from 0 to N-1, a convolution with a function U, convolution which correspo...
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WO/2000/008837A1 |
Methods and apparatus for echo and noise cancelation contemplate occasional saturation of an echo and/or noise containing source signal and control adaptation of a cancelation filter to minimize the detrimental effects of such source sig...
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WO/2000/005862A1 |
A telecommunications device includes a first telephone line enabling access to a telecommunications network and a second telephone line enabling access to a telecommunications network. A selection apparatus is included which in response ...
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WO/2000/004698A1 |
To achieve an improved convergence behaviour for, e.g., echo cancellation there is provided a digital adaptive filter comprising a filter coefficient update means (52; 78) to successively update filter coefficience in accordance with an ...
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WO/1999/067940A1 |
A method and apparatus for cancelling acoustic echoes that enhances the hands-free operation of audio/video conferencing equipment, wireless and cellular telephones, internet and intranet telephones, etc. is disclosed. The method and app...
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WO/1999/059320A1 |
A method and system (10) for providing suppression of near-end speech energy for tone signal detectors (27) or FSK demodulator (28). In accordance with the invention a system or device (100) is connected between the tip and ring on a sub...
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WO/1999/057937A1 |
A headset control system for operating a microcontroller (49) based device includes a microphone (16), a first and second speaker (17, 18), and a user operated switch (12). The switch selectively disables said first speaker (17) in a fir...
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WO/1999/057868A2 |
Disclosed is an interface circuit for a telephone line comprising integrated circuit means and switchable coupling means for coupling the telephone line and the integrated circuit means, the switchable coupling means being embodied as re...
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WO/1999/057871A1 |
The invention relates to a communication device such as radiophone (RP) having enclosure, which consists one or several parts (ENCL1 and ENCL2) and said enclosure is at least partially made from titanium or alloy, which includes titanium.
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WO/1999/055065A1 |
A multi-station telephone system having a telephone control module (24) based user site network is provided. The system includes a plurality of electronic devices (26) located at a user site (12). A site telephone line (20) is coupled to...
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WO/1999/053674A1 |
An audio conferencing system in which each participant in the conference generates a monaural signal for transmission on an output channel (42) to the other participants, and receives a plurality of input channels (411, 412, 413) from th...
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WO/1999/053673A1 |
A teleconferencing system comprises a conference bridge (100) having a multichannel connection (5) to each customer equipment (10). The customer equipment (10) has means (14) to separately process each channel (51, 52, 53) to provide one...
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WO/1999/053717A2 |
An interface and method for connecting a remote key telephone set (KTS) to a private branch exchange (PBX) through a public switch telephone network (PSTN), so that the KTS operates as part of the PBX, and a communication system includin...
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WO/1999/052255A2 |
Disclosed is a method for setting up a connection between a mobile radio network and a destination call number in a private communication network via a mobile radio network gateway. According to the inventive method, a call request is tr...
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