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1. 发明申请

US20220200657A1 Signal transceiving apparatus and method having echo-canceling mechanism 有权
公开(公告)号：US20220200657A1
公开(公告)日：2022-06-23
申请号：US17358402
申请日：2021-06-25
申请人： REALTEK SEMICONDUCTOR CORPORATION
发明人： CHENG-HSIEN LI
IPC分类号： H04B3/21 , H04B3/23 , H04B1/04
摘要： The present invention discloses a signal transceiving apparatus having echo-canceling mechanism. A mixer circuit includes a Wheatstone bridge and a transformer winding circuit. The Wheatstone bridge includes another transformer winding circuit and a variable load and includes a first input terminal, a first output terminal, a second input terminal and a second output terminal located at each two neighboring arms in an order. A transmission circuit is coupled to the first input terminal and the second input terminal to perform signal transmission through the mixer circuit. A receiving circuit is coupled to the first output terminal and the second output terminal to perform signal receiving through the mixer circuit. A control circuit adjusts the impedance of the variable load when a residual echo noise amount does not satisfy a minimum echo noise amount condition, and stops to adjust the impedance when the residual echo noise amount satisfies the condition.

2. 发明授权

US11133915B2 Cable modem and digital compensation for switchable analog filter to assist echo cancellation in full duplex cable modem 有权
公开(公告)号：US11133915B2
公开(公告)日：2021-09-28
申请号：US16601611
申请日：2019-10-15
申请人： MaxLinear, Inc.
发明人： Boaz Kol , Noam Tal , Shaul Shulman , Thushara Hewavithana
IPC分类号： H04L5/14 , H04B3/21 , H04L27/00 , H04L27/148
摘要： A cable modem supporting full duplex (FDX) operations. The cable modem includes a transmit circuitry configured to process a transmit signal and a receive circuitry configured to process a receive signal. The receive circuitry includes a switchable analog filter configured to filter the receive signal. The switchable analog filter is configurable for different passband frequencies. The receive circuitry also includes a digital compensation filter configured to compensate a difference in frequency response in a specific frequency band due to switching of the switchable analog filter for a different passband frequency. The cable modem also includes an adjacent channel interference (ACI) cancellation filter and an adjacent leakage interference (ALI) cancellation filter. A digital compensation filter is also used in processing the ACI cancellation signal and the ALI cancellation signal to impose or compensate the difference in frequency response due to the switchable analog filter switching.

3. 发明授权

US11018647B2 Electrical filter structure 有权
公开(公告)号：US11018647B2
公开(公告)日：2021-05-25
申请号：US16849671
申请日：2020-04-15
申请人： Advantest Corporation
发明人： Giovanni Bianchi
IPC分类号： H03H7/01 , H04B3/21 , H03H7/12
摘要： An electrical filter structure for forwarding an electrical signal from a first port to a second port in a frequency selective manner, wherein the filter is an edge-coupled filter, the filter comprising: a plurality of coupled line sections coupled in a series, comprising at least a first coupled line section and a last coupled line section; wherein the first port is connected with the first of the coupled line sections using a first transmission line; wherein the second port is connected with the last of the coupled line sections using a second transmission line; wherein the electrical filter comprises an open stub; wherein a length of the open stub is chosen such that an electrical length of the open stub is equal, within a tolerance of +/−20 percent, to a fourth of a wavelength of a signal having a frequency of twice a passband center frequency of the filter.

4. 发明申请

US20210090585A1 SYSTEM AND METHOD FOR PROCESSING AUDIO DATA 有权
公开(公告)号：US20210090585A1
公开(公告)日：2021-03-25
申请号：US17113479
申请日：2020-12-07
申请人： IMMERSION NETWORKS, INC.
发明人： James David Johnston , Stephen Daniel White , King Wei Hor , Barry M. Genova
IPC分类号： G10L19/16 , H04N19/625 , H04N19/44 , H04B1/66 , H04B3/20 , G10L19/025 , G10L19/00 , G10L19/032 , G10L19/008 , G10L19/02 , H04L29/06 , H04N21/233 , H03H17/02 , H04B3/21
摘要： An encoder operable to filter audio signals into a plurality of frequency band components, generate quantized digital components for each band, identify a potential for pre-echo events within the generated quantized digital components, generate an approximate signal by decoding the quantized digital components using inverse pulse code modulation, generate an error signal by comparing the approximate signal with the sampled audio signal, and process the error signal and quantized digital components. The encoder operable to process the error signal by processing delayed audio signals and Q band values, determining the potential for pre-echo events from the Q band values, and determining scale factors and MDCT block sizes for the potential for pre-echo events. The encoder operable to transform the error signal into high resolution frequency components using the MDCT block sizes, quantize the scale factors and frequency components, and encode the quantized lines, block sizes, and quantized scale factors for inclusion in the bitstream.

5. 发明授权

US10367631B2 Front end for full duplex cable modem 有权
公开(公告)号：US10367631B2
公开(公告)日：2019-07-30
申请号：US15648309
申请日：2017-07-12
申请人： CISCO TECHNOLOGY, INC.
发明人： John T. Chapman , Hang Jin
IPC分类号： H04B3/21 , H04B3/23 , H04L5/14 , H04L12/28 , H04L25/08 , H04L27/12 , H04L27/148
摘要： Designs for a front end for suppressing adjacent channel interference (ACI) and adjacent leakage interference (ALI) in a full duplex cable modem (CM) for a Data Over Cable Service Interface Specification (“DOCSIS”) network are described. The CM includes an upstream (US) signal path receiving a digital US input signal and transmitting an analog-converted US signal in a US frequency range to a cable modem termination system (CMTS); a downstream (DS) signal path receiving an analog DS signal in a DS frequency range and converting the analog DS signal into a digital DS signal; and an echo cancellation (EC) circuit configured to subtract, from at least one of the analog DS signal and the digital DS signal, a correction signal generated from the digital US input signal or a correction signal generated from the analog-converted US signal to generate an echo-cancelled digital DS input signal without ACI and ALI.

6. 发明授权

US10122863B2 Full duplex voice communication system and method 有权
公开(公告)号：US10122863B2
公开(公告)日：2018-11-06
申请号：US15683862
申请日：2017-08-23
申请人： Microsemi Semiconductor (U.S.) Inc.
发明人： Tanmay Zargar , Dillon Reed Ritter , Rodolfo Silva , Eric Bass , Francis Chukwuemeka Onochie
IPC分类号： H04M9/08 , G10L21/0232 , G10L25/84 , H04B3/21 , H04B3/23
摘要： A full duplex voice communication method constituted of: estimating an acoustic echo within a near-end signal; cancelling the estimated acoustic echo; detecting whether, or not, a change has occurred in a near-end acoustic echo path, the received near-end signal represents speech and the received far-end signal represents silence, wherein, responsive to the results thereof, the method is further constituted of: alternately attenuating frequency components of the echo cancelled near-end signal by a first frequency domain attenuation value and by a second greater frequency domain attenuation value; alternately attenuating a first function of the frequency component attenuated echo cancelled near-end signal by a first switchable attenuation value and by a second greater switchable attenuation value; and alternately attenuating a second function of the received far-end signal by a third switchable attenuation value and by a fourth greater switchable attenuation value.

7. 发明申请

US20180262624A1 SIGNAL SPLITTER/COMBINER WITH AN ELECTRO-MAGNETIC INTERFERENCE FILTER 审中-公开
公开(公告)号：US20180262624A1
公开(公告)日：2018-09-13
申请号：US15910118
申请日：2018-03-02
申请人： COMTEST NETWORKS INC.
发明人： Shawn Michael DELAY , Savo TODORIC , Russell D. ADAMS
IPC分类号： H04M11/06 , H04B3/21
CPC分类号： H04M11/062 , H04B3/21 , H04B3/50
摘要： A splitter/combiner configured to split and combine Plain Old Telephone Service (POTS) signals and data service signals. The splitter/combiner comprises a line terminal configured to receive wires of a local loop connection to a Central Office of a communications network; a phone terminal configured to connect to telephone equipment at a customer premise; a data terminal configured to connect to a modem at a customer premise; a POTS line low pass filter connected between the line terminal and the phone terminal, the POTS line low pass filter configured to attenuate frequencies above 25 kHz and including a POTS line side transformer; a surge arrestor connected between the POTS line side transformer and the phone terminal; and a data line transformer configured as a differential mode choke connected between the line terminal and the data terminal.

8. 发明授权

US09191519B2 Echo suppressor using past echo path characteristics for updating 有权
标题翻译：回波抑制器使用过去的回波路径特征进行更新
公开(公告)号：US09191519B2
公开(公告)日：2015-11-17
申请号：US14335451
申请日：2014-07-18
申请人： Oki Electric Industry Co., Ltd.
发明人： Naoya Kawabata
IPC分类号： H04M9/08 , H04B3/21
CPC分类号： H04M9/082 , H04B3/21
摘要： In an echo suppressor, a frequency bin component detector compares a far-end signal amplitude spectrum with a threshold value for each frequency bin to determine whether or not each frequency bin includes a frequency component. A frequency bin echo path characteristic estimator uses the far-end signal amplitude spectrum in the frequency bins determined to have a frequency component by the frequency bin component detector and the near-end input signal amplitude spectrum of corresponding frequency bins to estimate the echo path characteristics of the frequency bins. An estimated echo signal calculation-and-echo suppressor section calculates estimated echo signals based on the echo path characteristic in each frequency bin and the far-end signal amplitude spectrum to suppress the estimated echo signals from the near-end input signal amplitude spectrum.
摘要翻译：在回波抑制器中，频率分量分量检测器将远端信号幅度频谱与每个频率仓的阈值进行比较，以确定每个频率仓是否包括频率分量。频率仓回波路径特性估计器使用被确定为具有频率分量检测器的频率分量的频率仓中的远端信号幅度谱和相应频率仓的近端输入信号振幅谱，以估计回波路径特性的频率箱。估计的回波信号计算和回波抑制器部分基于每个频率仓中的回波路径特性和远端信号振幅频谱计算估计的回波信号，以抑制来自近端输入信号振幅谱的估计回波信号。

9. 发明申请

US20140010356A1 INTEGRATED HYBIRD CIRCUIT APPLIED TO A DIGITAL SUBSCRIBER LOOP AND SETTING METHOD THEREOF 有权
标题翻译：适用于数字订户环路的集成HYBIRD电路及其设置方法
公开(公告)号：US20140010356A1
公开(公告)日：2014-01-09
申请号：US13937197
申请日：2013-07-08
申请人： Realtek Semiconductor Corp.
发明人： Cheng-Hsien Li , Wen-Chieh Lai , Chih-Chiang Liao
IPC分类号： H04B3/21
CPC分类号： H04B3/21
摘要： An integrated hybrid circuit includes a transmission unit, a transceiver coil, a transceiver circuit, a hybrid matching circuit, and a receiving circuit. The transmission unit generates a pair of upstream signals according to a user transmission signal. The transceiver coil transmits the pair of upstream signals to a central office through a pair of twisted pair, and receiving a pair of downstream signals from the central office through the pair of twisted pair. The hybrid matching circuit receives an adjustment signal to adjust selective impedances. The receiving circuit receives the pair of downstream signals from the central office, and generates the adjustment signal according to downstream and upstream rates and signals from the hybrid matching circuit. The transmission unit adjusts transmission power and bandwidth of the transmission unit and the receiving unit adjusts filter bandwidth of the receiving unit according to the adjustment signal for optimizing upstream and downstream rates.
摘要翻译：集成混合电路包括发送单元，收发机线圈，收发器电路，混合匹配电路和接收电路。发送单元根据用户发送信号生成一对上行信号。收发器线圈通过一对双绞线将一对上行信号发送到中心局，并通过一对双绞线从中心局接收一对下行信号。混合匹配电路接收调整信号以调整选择性阻抗。接收电路从中心局接收一对下行信号，根据下游和上行速率和来自混合匹配电路的信号产生调整信号。发送单元调整发送单元的发送功率和带宽，并且接收单元根据用于优化上行和下行速率的调整信号来调整接收单元的滤波器带宽。

10. 发明申请

US20100074095A1 TRANSMITTER CIRCUIT TO COMPENSATE FOR INFLUENCE OF CROSSTALK NOISE IN PRE-EMPHASIS SCHEME 失效
标题翻译：发射机电路，用于补偿CROSTALK噪声在预演方案中的影响
公开(公告)号：US20100074095A1
公开(公告)日：2010-03-25
申请号：US12512904
申请日：2009-07-30
申请人： Hae Kang JUNG , Hong June PARK , Kyoung Ho LEE
发明人： Hae Kang JUNG , Hong June PARK , Kyoung Ho LEE
IPC分类号： H04B3/21
CPC分类号： H04L25/03343 , H04L2025/03426
摘要： A transmitter circuit for transmitting parallel data, suitable for compensating for influence of crosstalk noise in a pre-emphasis scheme. The transmitter circuit includes first through Nth transmission lines configured to respectively transmit first through Nth data (N is 2 or greater); first through Nth output driving circuit sections configured to output the first through Nth data transmitted through the first through Nth transmission lines; first through Nth pre-emphasis circuit sections configured to generate first through Nth pre-emphasis signals for controlling transition output levels of the first through Nth data depending upon signal modes of adjoining data among the first through Nth data; and first through Nth adders configured to generate first through Nth data output signals that are controlled in transition output levels using output signals of the first through Nth output driving circuit sections and the first through Nth pre-emphasis signals.
摘要翻译：一种用于发送并行数据的发射机电路，适用于在预加重方案中补偿串扰噪声的影响。发射机电路包括分别发送第一至第N数据（N为2或更大）的第一至第N传输线。第一至第N输出驱动电路部分，被配置为输出通过第一至第N传输线传输的第一至第N数据; 第一至第N预加重电路部分，被配置为产生第一至第N预加重信号，用于根据第一至第N数据中相邻数据的信号模式来控制第一至第N数据的转换输出电平; 以及第一至第N加法器，被配置为使用第一至第N输出驱动电路部分的输出信号和第一至第N预加重信号产生以转换输出电平控制的第一至第N数据输出信号。

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