公开(公告)号：US20230421704A1

公开(公告)日：2023-12-28

申请号：US18460882

申请日：2023-09-05

申请人： DSP Group Ltd.

发明人： Yaakov CHEN ,  Adoram ERELL ,  Dmitri Lvov

IPC分类号： H04M9/08 ,  H04B3/23

CPC分类号： H04M9/082 ,  H04B3/23 ,  G10L2021/02082

摘要： A first mobile communication device that includes a first microphone, a first speaker, and a first delay unit. The first microphone is configured to (i) receive, during a conference call, a first user first microphone signal from a first user, and (ii) output a first microphone digital signal to the first delay unit. The first user first microphone signal represents audio content outputted by the first user. The first delay unit is configured to delay, by a delay period, the first microphone digital signal to provide a delayed first user first device digital signal. The first mobile communication device is configured to output, to a mixer, the delayed first user first device digital signal. The delay period is determined based on measurements executed by at least one mobile communication device out of the first mobile communication device, a second mobile communication device and a third mobile communication device.

公开(公告)号：US20230351997A1

公开(公告)日：2023-11-02

申请号：US18349646

申请日：2023-07-10

申请人： Fatih Mehmet Ozluturk

发明人： Fatih Mehmet Ozluturk

IPC分类号： G10K11/178 ,  G10K11/175 ,  G06F3/16 ,  G10L21/0208 ,  H04R1/10 ,  H04B3/23

CPC分类号： G10K11/17823 ,  G10K11/175 ,  G10K11/17885 ,  G10K11/17821 ,  G10K11/17827 ,  G10K11/17855 ,  G10K11/17857 ,  G10K11/17873 ,  G06F3/165 ,  G10L21/0208 ,  H04R1/1083 ,  H04B3/23 ,  G10K2210/1081 ,  A61F11/145

摘要： A method, system, and apparatus for noise cancelation is disclosed, which may be used in a wireless unit (WU). The WU may include a processor, a memory, a user interface, one or more internal microphones and internal speakers. A removably connected headset may include microphones and speakers. The WU may receive a first signal from the headset. The WU may receive a first ambient noise at the one or more internal microphones, and the WU may generate a second signal based on the first ambient noise. The WU may calculate an estimate of ambient noise based on the first and second signals, calculate a signal for noise cancellation based on the estimate, cancel estimated ambient noise from an audio output signal based on an application of the signal for noise cancellation, and send the audio output signal to one or more speakers of the headset or of the WU.

公开(公告)号：US11716116B2

公开(公告)日：2023-08-01

申请号：US17711491

申请日：2022-04-01

申请人： REALTEK SEMICONDUCTOR CORPORATION

发明人： Hsuan-Ting Ho ,  Liang-Wei Huang ,  Po-Han Lin ,  Chia-Lin Chang

IPC分类号： H04B3/20 ,  H04B3/23 ,  H04L25/02

CPC分类号： H04B3/23 ,  H04L25/0228

摘要： A method includes: generating a first signal according to a digital signal; filtering the first signal according to first filter coefficients of first filter to generate a second signal; adding a first reference signal with the second signal to generate a third signal; performing digital-to-analog conversion according to the first and third signals to generate and output an echo signal; performing analog-to-digital conversion according to the echo signal to generate a fourth signal; generating a fifth signal according to the digital signal and the fourth signal; and updating the first filter coefficients according to the fifth signal. Generating the fifth signal includes: generating second filter coefficients of second filter; updating the second filter coefficients according to a second reference signal and the fourth signal; obtaining a first and second representative coefficients of the second filter coefficients; and generating the fifth signal according to the first and second representative coefficients.

公开(公告)号：US20190229767A1

公开(公告)日：2019-07-25

申请号：US16371849

申请日：2019-04-01

申请人： Schlumberger Technology Corporation

发明人： Alex Olson ,  Nalin Weerasinghe ,  Kun Wang ,  Milos Milosevic

IPC分类号： H04B3/32 ,  H04B3/23

CPC分类号： H04B3/32 ,  G01V11/002 ,  H04B3/23

摘要： Methods and systems for multiple carrier frequency, half duplex cable telemetry for a wellsite. The methods involve generating a first type of bi-directional message in a first propagation mode, generating a second type of bi-directional message in the first propagation mode and in a second propagation mode, transmitting over a cable operatively coupling a surface modem and a downhole modem the first and second types of bi-directional message sequentially in a plurality of time periods across a single frequency bandwidth, and separating each of the first and second types of bi-directional message from a most subsequently transmitted one of the first and second types of bi-directional message by a quiet time sample during which no message is transmitted.

公开(公告)号：US20180248583A1

公开(公告)日：2018-08-30

申请号：US15820495

申请日：2017-11-22

申请人： SOKEN, INC. ,  DENSO CORPORATION

发明人： Youhei SEKIYA ,  Hiroyuki MORI ,  Yoshifumi KAKU ,  Hironobu AKITA

IPC分类号： H04B3/36 ,  H04B3/23 ,  H04B7/185 ,  B60R16/023

CPC分类号： H04B3/36 ,  B60R16/023 ,  H04B3/23 ,  H04B7/18584

摘要： A relay device for data between communication cables having a signal line in full duplex communication, includes: communication units connected to the communication cables; and a main controller executing a relay process of the data. Each communication unit includes: an input/output unit of an analog signal; an analog/digital converter converting the analog signal into a digital signal; a generator generating another digital signal based on another analog signal input to another communication unit; and an echo canceller calculating a filter coefficient based on the other digital signal and the digital signal, and executing a cancellation process of removing a component derived from the other digital signal from the digital signal according to the filter coefficient. The communication unit or the main control unit includes a sign determination unit determining based on a time change of the filter coefficient whether a sign of disconnection exists in the signal line.

公开(公告)号：US09913026B2

公开(公告)日：2018-03-06

申请号：US14498972

申请日：2014-09-26

申请人： Microsoft Technology Licensing, LLC

发明人： Per Ahgren ,  Karsten V. Sørensen

IPC分类号： H04B3/20 ,  H04R3/00 ,  H04R1/08 ,  H04L29/06 ,  H04M9/08 ,  H04B3/23

CPC分类号： H04R3/002 ,  H04B3/23 ,  H04L65/403 ,  H04L65/80 ,  H04M9/082 ,  H04R1/08

摘要： A method implemented during a communication event conducted between a user device and at least one further user device over a communications network, the method comprising: receiving an audio signal that is to be output from a speaker of said user device, said audio signal comprising at least one microphone signal transmitted from the at least one further user device; detecting that said audio signal comprises at least one audio component of a microphone signal transmitted from one or more of one of said at least one further user device that is co-located with said user device; and based on this detection, removing said at least one audio component from said audio signal to produce an output audio signal for output from said speaker.

公开(公告)号：US20170372722A1

公开(公告)日：2017-12-28

申请号：US15189382

申请日：2016-06-22

申请人： Cisco Technology, Inc.

发明人： Xilin Li ,  Wei Li ,  Fuling Liu ,  Xinmin Yan

IPC分类号： G10L21/0264 ,  G10L25/06 ,  G10L25/72 ,  G10L21/0232 ,  G10L21/0208

CPC分类号： G10L21/0264 ,  G10L21/0232 ,  G10L25/06 ,  G10L25/72 ,  G10L2021/02082 ,  H04B3/23 ,  H04M9/082

摘要： An echo cancellation method includes receiving an echo reference signal, receiving a microphone signal, decomposing, with a first filter bank, the echo reference signal into a series of subband echo reference signals, decomposing, with a second filter bank, the microphone signal into a series of subband microphone signals, estimating a group delay between the echo reference signal and the microphone signal using the series of subband echo reference signals and the series of subband microphone signals, estimating, using adaptive filters, acoustic echoes in the echo reference signal based at least in part on the group delay, subtracting the acoustic echoes from the series of subband microphone signals to obtain a series of acoustic echo removed subband signals, combining the series of acoustic echo removed subband signals into a single time domain echo removed signal, and sending the single time domain echo removed signal to a host operating system.

公开(公告)号：US09805734B2

公开(公告)日：2017-10-31

申请号：US13877593

申请日：2011-09-15

申请人： Akihiko Sugiyama

发明人： Akihiko Sugiyama

IPC分类号： G10L21/0208 ,  H04B3/23 ,  H04M9/08 ,  H03H21/00 ,  G10L21/0224 ,  G10L21/0216

CPC分类号： G10L21/0208 ,  G10L21/0224 ,  G10L2021/02082 ,  G10L2021/02165 ,  H03H21/0012 ,  H03H21/0067 ,  H03H2021/0072 ,  H03H2021/0078 ,  H03H2021/0094 ,  H04B3/23 ,  H04M9/082

摘要： From a mixed signal in which a first signal and a second signal are mixed, the second signal is removed at low processing cost and without delay. As a result, an estimated first signal which has low residue of the second signal and low distortion is obtained.An estimated first signal is generated by subtracting a pseudo second signal which is estimated to be mixed in a first mixed signal in which a first signal and a second signal are mixed from the first mixed signal. The pseudo second signal is obtained by a first adaptive filter using a second mixed signal in which the first signal and the second signal are mixed in a different proportion from the first mixed signal. A coefficient update amount of the first adaptive filter is made smaller as compared with a case when the estimated first signal is smaller than the first mixed signal, in case the estimated first signal is larger than the first mixed signal.

公开(公告)号：US09767828B1

公开(公告)日：2017-09-19

申请号：US13535232

申请日：2012-06-27

申请人： Kavitha Velusamy ,  Wai C. Chu ,  Ramya Gopalan ,  Amit S. Chhetri

发明人： Kavitha Velusamy ,  Wai C. Chu ,  Ramya Gopalan ,  Amit S. Chhetri

IPC分类号： G06K9/00 ,  G10L25/78 ,  H04N21/442 ,  H04B3/23

CPC分类号： G10L25/78 ,  G06K9/00268 ,  G06K9/00335 ,  G06K9/00362 ,  G10L17/00 ,  G10L21/0208 ,  G10L2021/02082 ,  H04B3/23 ,  H04B3/231 ,  H04N21/44218

摘要： Techniques for enhancing an acoustic echo canceller based on visual cues are described herein. The techniques include changing adaptation of a filter of the acoustic echo canceller, calibrating the filter, or reducing background noise from an audio signal processed by the acoustic echo canceller. The changing, calibrating, and reducing are responsive to visual cues that describe acoustic characteristics of a location of a device that includes the acoustic echo canceller. Such visual cues may indicate that no human being is present at the location, that some subject(s) are engaged in speaking or sound generating activities, or that motion associated with an echo path change has occurred at the location.

公开(公告)号：US09742463B2

公开(公告)日：2017-08-22

申请号：US15136476

申请日：2016-04-22

申请人： Huawei Technologies Co., Ltd.

发明人： Zhilei Zhao

IPC分类号： H04B3/23 ,  H03F1/56

CPC分类号： H04B3/23 ,  H03F1/56 ,  H03F2200/387 ,  H03F2200/423

摘要： A copper wire interface circuit is provided, where a current output amplifier is connected to a port impedance component and a transmit end, and the current output amplifier is configured to amplify a to-be-transmitted signal; the port impedance component is connected to a high-pass filter, impedance, after undergoing impedance transformation performed by the high-pass filter, of the port impedance component is used for performing impedance matching with equivalent impedance of a cable and a load; the high-pass filter is connected to the port impedance component and the cable, the high-pass filter is configured to filter the to-be-transmitted signal or a received signal and perform impedance transformation on the port impedance component; and an echo cancellation module is connected to the port impedance component and a receive end.