公开(公告)号：US20140241405A1

公开(公告)日：2014-08-28

申请号：US14189613

申请日：2014-02-25

申请人： REALTEK SEMICONDUCTOR CORPORATION

发明人： CHENG-HSIEN LI

IPC分类号： H04B3/20

CPC分类号： H04B3/20

摘要： The present invention discloses a transceiver of digital subscriber line (DSL) which supports a variety of DSL systems, comprising: a transmission circuit for receiving an output signal and generating a first DSL transmission signal or a second DSL transmission signal according to the output signal under the control of a transmission selection parameter; a hybrid circuit for generating a line transmission signal according to the first or second DSL transmission signal and generating a DSL reception signal according to a line reception signal; and a reception circuit for generating a first DSL reception signal or a second DSL reception signal according to the DSL reception signal, and then outputting one of the first and second DSL reception signals as an input signal according to a reception selection parameter.

摘要翻译： 本发明公开了一种支持各种DSL系统的数字用户线（DSL）收发机，包括：发送电路，用于接收输出信号，并根据下面的输出信号生成第一DSL传输信号或第二DSL传输信号 传输选择参数的控制; 用于根据第一或第二DSL传输信号产生线路传输信号并根据线路接收信号产生DSL接收信号的混合电路; 以及接收电路，用于根据DSL接收信号产生第一DSL接收信号或第二DSL接收信号，然后根据接收选择参数输出第一和第二DSL接收信号中的一个作为输入信号。

公开(公告)号：US20150103986A1

公开(公告)日：2015-04-16

申请号：US14316539

申请日：2014-06-26

申请人： REALTEK SEMICONDUCTOR CORPORATION

发明人： YUNG-TAI CHEN ,  CHENG-HSIEN LI ,  HUNG-CHEN CHU ,  JIAN-RU LIN

IPC分类号： H04B3/20 ,  H04M1/76

CPC分类号： H04B3/20

摘要： This invention discloses a signal transmitting and receiving circuit of a digital subscriber line used for transmitting an output signal to a telecommunication loop or receiving an input signal from the telecommunication loop. The signal transmitting and receiving circuit comprises a transformer, which is coupled to the telecommunication loop; a signal transmitting module, which is coupled to the transformer, for generating the output signal; a signal receiving module, which is coupled to the transformer, for processing the input signal; an echo cancelling circuit, comprising passive components and having two ends, one of which is coupled to the signal transmitting module and the transformer, the other is coupled to the signal receiving module and the transformer. The output signal is transmitted to the telecommunication loop via the electromagnetic coupling of the transformer, and the input signal is received by the signal receiving module by the electromagnetic coupling of the transformer.

摘要翻译： 本发明公开了一种数字用户线路的信号发送和接收电路，用于向电信环路发送输出信号或从电信环路接收输入信号。 信号发射和接收电路包括耦合到电信环路的变压器; 信号发射模块，其耦合到所述变压器，用于产生所述输出信号; 信号接收模块，其耦合到所述变压器，用于处理所述输入信号; 回波消除电路，包括无源部件并具有两端，其中一端耦合到信号传输模块和变压器，另一端耦合到信号接收模块和变压器。 输出信号通过变压器的电磁耦合传输到电信环路，输入信号由变压器的电磁耦合由信号接收模块接收。

公开(公告)号：US20210144030A1

公开(公告)日：2021-05-13

申请号：US17088622

申请日：2020-11-04

申请人： REALTEK SEMICONDUCTOR CORPORATION

发明人： TSUNG-EN WU ,  CHENG-HSIEN LI

IPC分类号： H04L25/03

摘要： The present disclosure discloses a signal equalization apparatus. A channel length estimation circuit determines a transmission channel length of the input signal such that a processing circuit retrieves predetermined feed-forward equalizer coefficients. A feed-forward equalizer equalizes the input signal according to operation feed-forward equalizer coefficients. An auto gain circuit amplifies the input signal according to an offset signal. A signal adding circuit adds the amplified input signal and a feedback adjusting signal to generate an added input signal. A data slicer generates a data-slicing result and the offset signal according to reference thresholds based on the added input signal. A feedback equalizer equalizes the data-slicing result to generate the feedback adjusting signal according to operation feedback equalizer coefficients. The feed-forward equalizer ad the feedback equalizer keeps updating the equalizer coefficients such that a signal interference noise is eliminated rapidly to increase a signal and noise ratio of the system.

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.