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US20090279686 |
ECHO PATH CHANGE DETECTION IN TELECOMMUNICATIONS NETWORKS
In one embodiment, the present invention is a method for detecting an echo path change (EPC) in a telecommunications network. The method detects whether the effectiveness of echo cancellation of an...
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US20090185674 |
Communication system
In an embodiment, a method for removing an echo component is a first signal received at an audio input device includes outputting a second signal from an audio output device, receiving at the audio...
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US20090136020 |
METHOD AND APPARATUS FOR ECHO CANCELLATION
A method and apparatus for echo cancellation is disclosed. The apparatus includes an echo compensator and a double talk detector. The echo compensator compensates for associated feedback echo by...
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US20090122975 |
METHOD, SYSTEM AND APPARATUS FOR CONTROLLING AN ECHO CANCELLER DURING FAXING
A method, an apparatus and a system for controlling an echo canceller in faxing are provided. The method includes: after detecting a triggering signal, the signal detecting apparatus enables the...
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US20090110185 |
VEHICLE CALL DEVICE, CALL SYSTEM, CENTER, AND CALLING METHOD
A vehicle call device, a call system, a center, and a calling method capable of detecting a problem while controlling the cost increase are disclosed. The vehicle call device includes a speaker...
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US20090074177 |
Echo canceler and echo canceling program
An echo canceler uses an adaptive filter to remove an echo of an incoming far-end signal from an outgoing near-end signal. Filter coefficients are calculated and updated while the far-end signal is...
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US20090067615 |
ECHO CANCELLATION USING GAIN CONTROL
A device for reducing echo by controlling microphone and/speaker gain in a telecommunications system is disclosed. An exemplary embodiment of the device may have an echo detector, echo level...
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US20090046847 |
ACOUSTIC ECHO CANCELLER USING MULTI-BAND NONLINEAR PROCESSING
An echo canceller ( 106 ) can include a first multi-band filter ( 152 ) which receives a first input signal ( 108 ) and generates a first plurality of sub-band signals ( 110, 111, 112 ), and a...
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US20090034712 |
Echo cancellation in which sound source signals are spatially distributed to all speaker devices
A system includes microphone devices, echo cancellation mechanism, and speaker devices. Each echo cancellation mechanism corresponds to one of the microphone devices. Each speaker device...
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US20090022074 |
Echo canceller with interference-level controlled step size
Echo canceling method comprising the steps: a) receiving a first signal and a second signal, said second signal comprising an echo of the first signal, b) generating an echo replica signal by...
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US20090003586 |
SIGNAL PROCESSOR AND METHOD FOR CANCELING ECHO IN A COMMUNICATION DEVICE
The invention provides a signal processor installed in a communication device. In one embodiment, the signal processor comprises a voice activity detector, a nonlinear echo processor, and a speaker...
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US20080304675 |
Acoustic Echo Canceller
An acoustic echo cancellation device ( 1 ) for canceling an echo (e) in a microphone signal (z) in response to a first input signal (s) and a second input signal (m) comprises: —a first...
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US20080292093 |
METHOD AND APPARATUS FOR ECHO CANCELLATION
A technique of echo cancellation in a communication system. A method and/or apparatus of echo cancellation that may be suitable for performing echo cancellation under single talk and double talk...
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US20080253552 |
Acoustic Echo Canceller
An acoustic echo cancellation device ( 1 ) for canceling an echo in a microphone signal (z) in response to a far-end signal (x) comprises: an adaptive filter unit ( 10 ) arranged for filtering the...
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US20080232577 |
Echo cancellation
A method of determining if an echo canceller comprised in a communication channel that is used to transmit at least one tonal signal and characterized by a model echo path of the channel, is...
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US20080219431 |
METHOD AND APPARATUS FOR ECHO CANCELLATION
A telephony system equipped with an echo cancellation module is disclosed. A hybrid interface circuit outputs an outbound signal to a wall jack while receiving an inbound signal from the wall jack....
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US20080187129 |
Method and System for Echo Cancellation In A Network Switch
A method and system in network switch for cancelling multiple sources of network echo, including echo that is combined with a persistent, non-echo signal. A first echo canceller cancels a first...
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US20080144808 |
CIRCUIT FOR ADJUSTING IMPEDANCE MISMATCH AND METHOD THEREFOR
A circuit that connects into a telephone line to correct an impedance mismatch between two pieces of equipment, which eliminates the echo that results from an impedance mismatch. The circuit is...
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US20080101593 |
Circuit method and system for transmitting information
Disclosed is a method and circuit for echo suppression or cancellation. According to some embodiments of the present invention, there is provided a circuit including a...
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US20080089512 |
Implementation of a communication link in powered device for layer 2 support
A system and method for enabling communication between power source equipment and a powered device chip. In one embodiment, communication between the power source equipment and the powered device...
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US20080075269 |
Circuit method and system for transmitting information
Disclosed is an echo suppresser or cancellation circuit including a speech signal extrapolation unit. The speech extrapolation unit may provide extrapolated signal segment approximations to an echo...
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US20080031441 |
METHOD AND APPARATUS FOR FILTERING SIGNALS
A system ( 100 ) and method ( 300 ) are disclosed for filtering signals. A system that incorporates teachings of the present disclosure may include, for example, a speech processor ( 102 ) having...
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