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WO/1999/041897A2 |
The present invention relates to a method for improving acoustic noise attenuation, wherein said method uses a combination which comprises an adaptation control for the partial-band echo compensation process as well as a global-band post...
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WO/1999/041898A1 |
The present invention relates to a method for improving acoustic noise attenuation in hand-free devices essentially used in automobiles, wherein said method uses a level balance (22) as well as a plurality of echo-compensation adaptive f...
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WO/1999/039497A1 |
A beamformer is calibrated for use as an acoustic echo canceler in a hands-free communications environment having a loudspeaker and a plurality of microphones. To perform the calibration, a number of adaptive filters are provided in corr...
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WO/1999/035812A1 |
Methods and apparatus for controlling echo suppressors provide superior echo attenuation while optimizing perceived signal quality under a variety of conditions. The disclosed techniques provide desired levels of echo attenuation while m...
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WO/1999/035814A2 |
Methods and apparatus for achieving echo suppression in communications systems include an echo suppressor, referred to herein as an AC-center attenuator, which attenuates the echo component of a communications signal by multiplying a por...
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WO/1999/035813A1 |
Methods and apparatus for parametrically modeling background noise and generating comfort noise in echo suppression systems are disclosed. According to exemplary embodiments, a background noise model is based on a set of noise model para...
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WO/1999/031858A1 |
The invention relates to a communication system, especially an audio-oral system, to permit hands-free communication using a mobile telephone terminal in a motor vehicle. The acoustic loop between the microphone and loudspeaker element i...
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WO/1999/029094A1 |
A novel method and apparatus are disclosed for cancelling echoes originating from a digital mobile handset using an echo canceller (10) located in the network. The method and apparatus thus solve a practical echo problem that many mobile...
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WO/1999/029093A1 |
The invention relates to a method and device for suppressing echo in a hands free device such as a telephone. Control signals V¿in?, V¿out? with an amplitude and dynamic performance depending upon the mode of communication are produced...
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WO/1999/026401A1 |
An echo canceller circuit (25) for use in an echo canceller system is set forth that provides sensitive non-linear echo path response detection (300). The echo canceller circuit (25) comprises a first digital filter (35) having non-adapt...
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WO/1999/026390A1 |
An echo canceller circuit for use in an echo canceller system is set forth that provides sensitive double-talk detection. The echo canceller circuit comprises a second digital filter having adaptive tap coefficients to simulate an echo r...
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WO/1999/026400A1 |
An echo canceler circuit (25) for use in an echo canceller system is set forth. The echo canceller circuit (25) comprises a first digital filter (35) having non-adaptive tap coefficients to simulate an echo response occurring during a ca...
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WO/1999/026402A1 |
An echo canceller circuit (25) for use in an echo canceller system is set forth. The echo canceller circuit (25) comprises a first digital filter (35) having non-adaptive tap coefficients to simulate an echo response occurring during a c...
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WO/1999/026403A1 |
A non-linear processor (300) for use in an echo canceller (25) is set forth. The non-linear processor (300) includes a center clipping digital filter receiving an echo compensated signal. The non-linear processor provides a center clippe...
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WO/1999/026355A1 |
An acoustic echo canceller (AEC) is devised and tested in a real environment. The devised AEC puts together a number of available digital signal processing methods to make a real-time implementation of the AEC possible. The echo length c...
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WO/1999/026399A1 |
An echo canceller circuit (25) is set forth. The echo canceller circuit (25) includes a digital filter (30) having adaptive tap coefficients to simulate an echo response occurring during a call. The adaptive tap coefficients are updated ...
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WO/1999/022460A2 |
The present invention relates to a method and device at stereo acoustic echo cancellation. Acoustic echo cancellation in stereo is considerably more difficult than echo cancellation in mono, due to strong correlation between the stereo c...
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WO/1999/017526A1 |
The invention relates to an echo compensation method for a telecommunication device, comprising the following steps: production of at least one compensation signal (CM1, CM2) according to an output signal (OUT) of said telecommunication ...
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WO/1999/014868A1 |
Digitized input signals are sampled to obtain a reference input signal. The reference input signal is whitened in a pseudo way, to obtain a pseudo-whitened signal. A pseudo-echo signal is generated in accordance with the pseudo-whitened ...
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WO/1999/009730A1 |
A method and apparatus for implementing a speakerphone within personal computer (90) having a voice-capable modem (70) and an audio board (68). Personal computer (90) executes host software (94) providing the user interface for speakerph...
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WO/1999/007134A1 |
The invention concerns a method for regulating a hand free system deviation comprising a transmitted signal branch (MK, MV) and a received signal branch (WV, LP), each including adjustable attenuation stages (SD, ED). The method is chara...
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WO/1999/003091A1 |
Methods and apparatus for automatic gain and time delay computations between multiple sensors. In exemplary embodiments, one sensor is treated as a reference sensor with respect to a measured signal quantity which is assumed to be a narr...
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WO/1998/058448A1 |
A method and apparatus for improving sound quality in a voice transmission or recording system is disclosed. The system involves controlling an amount of gain used in amplifying a signal wherein a nominal gain characteristic that is subs...
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WO/1998/053595A1 |
In order to reduce acoustic echo and restore stereophonic sound in a digital transmission system of sound signals on P transmission channels, between a local site and one or several remote site(s), comprising several microphones and loud...
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WO/1998/051066A2 |
An echo canceler in which effective transfer function coefficients of an adaptive echo-canceling filter are adjusted periodically to track changing system conditions. Periodic adjustment of the effective coefficients is accomplished usin...
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WO/1998/049782A2 |
Known is a wire bound telecommunications device to be coupled to telecommunication lines comprising a transmission circuit coupled between the telecommunications lines, which transmission circuit comprises a power supply circuit for form...
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WO/1998/048527A2 |
An arrangement for cancelling an echo returning to a first mobile station (MS1) from a second mobile station (MS2). The arrangement comprises tandem free operation (TFO) and an acoustic echo canceller (AEC) to which criteria have been de...
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WO/1998/047276A1 |
In order to cancel echo on several sound signal channels, the method consists in generating on each channel a synthetic signal having the spectral characteristics of a white noise; computing the frequency masking thresholds in several ad...
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WO/1998/044710A1 |
A message waiting circuit (10) comprised of a pair of electrical leads (38, 42) which carry a message waiting signal, a capacitor (114) for storing electrical energy extracted from the message waiting signal, a transistor (70) for allowi...
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WO/1998/043368A2 |
A single two-ended echo canceller (102) is provided that uses an adaptive FIR filter (112) to model the impulse response of the echo path and cancel the echo originating from the PSTN side of the connection, and a non-linear processor (1...
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WO/1998/042084A1 |
A method and apparatus for allowing two or more Wireless Local Loop telephone users to communicate simultaneously with each other and a far end user in which earseal and hybrid echo is reduced. The present invention operates within a Wir...
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WO/1998/040974A1 |
The purpose of the present invention is thus to reduce the echo introduced by cross-talk. The problem described above, with how to reduce the echo introduced by cross-talk is solved by to the microphone and to the speaker introduce switc...
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WO/1998/039946A1 |
A speech processor which continuously uses the impulse response used by the preceding frame when a speech signal is included in the microphone input signal or the currently updated impulse response when no speech signal is included in th...
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WO/1998/039905A2 |
A method of increasing the terminal coupling loss in a digital half-duplex handsfree terminal is provided. When the terminal receive channel is active an idle code which is effectively zero is transmitted by an idle code generator. When ...
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WO/1998/039894A1 |
A doorbell response system that can be retrofit in an existing doorbell system of a dwelling. In a preferred embodiment, the dwelling includes a telephone line (31) and a telephone (35) connected thereto. The doorbell response system inc...
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WO/1998/037678A2 |
A virtual intercom method implemented by a computer-based electronic assistant (110) and including the steps of receiving a voice command from a first party (200), wherein the voice command identifies a user selectable one of a plurality...
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WO/1998/036515A2 |
Full duplex circuits provide a bi-directional signal path at one port (130) for transmit and receive signals and also provide separation between the transmit and receive signals at the output port (120). To accomplish this, the circuits ...
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WO/1998/033311A1 |
An improved non-linear processor used in echo cancellation eliminates a comfort noise source (214) and instead inputs a control signal (224) directly into a noise suppression system (403). The noise suppression system (403) uses the cont...
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WO/1998/030009A2 |
An echo and noise suppression device for processing an information signal to suppress unwanted signal components. In an exemplary embodiment, the echo suppression device includes an AC-center clipper having a clipping window with an adju...
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WO/1998/028857A1 |
A double talk and echo path change detector (100) is provided for use in an echo canceller (10) that makes a determination about whether a residual signal is dominated by echo or by a 'near end' signal. In order to make this determinatio...
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WO/1998/020668A1 |
A doorbell response system (19) can be retrofit in an existing doorbell system without requiring the incorporation of new wiring in the existing doorbell system.
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WO/1998/019441A2 |
Apparatus and method for the prevention of echo signals in terminals connected to a network carrying telephony traffic. The echo prevention occurs prior to the introduction of signal delay by a network. It provides a method of controllin...
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WO/1998/019436A1 |
A fixed wireless access subscriber unit containing a wireless transceiver and a telephone subscriber line interface circuit which supports privacy and remote release of hold between the subscriber unit and extension telephones are disclo...
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WO/1998/017035A1 |
End-user devices (12) are networked together by a connection to a common single-pair wire, such as standard telephone wiring. Deterministic-bandwidth data and nondeterministic-bandwidth data can be simultaneously communicated between a n...
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WO/1998/016050A2 |
Known is a telecommunications system comprising a near end and a far end subscriber unit communicating with each other via a transmission channel, at least the near end subscriber being arranged for handsfree communication. In the known ...
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WO/1998/015901A1 |
A novel process by which the utilization of a central processing unit (CPU) in performing filtering operations can be reduced by shortening the filter's length thus degrading the performance of the system down to a predetermined level or...
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WO/1998/015095A1 |
A structure and method of controlling a plurality of customer premises equipments (CPEs) coupled to a single premises telephone line (10). The CPEs can be Type III GMEC CPE (1), Type II Universal GMEC CPE (2), and/or Type II Satellite GM...
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WO/1998/012837A1 |
The invention relates to an information distribution system with a plurality of stations (100, 102, 104) and at least one shared resource (120, 122), such as an audio channel. Access to a shared resource is managed in a distributed manne...
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WO/1998/008203A1 |
A patient/nurse call system (10) for a hospital includes patient stations (18) capable of generating hospital calls and a remote master station (32) which prioritizes and stores the calls. Hall units (28) outside patient rooms (14) ident...
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WO/1998/007263A2 |
A system and method for dynamically optimizing the analog gain for a microphone in a telephone terminal operable in handsfree mode. The system makes use of a process whereby a relatively inexpensive analog to digital converter is used to...
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