公开(公告)号：US20130129021A1

公开(公告)日：2013-05-23

申请号：US13550969

申请日：2012-07-17

申请人： Jae Ho LEE ,  Yang Su KIM ,  Han Seung KOO ,  Sang Jung RA ,  Dong Joon CHOI ,  Nam Ho HUR

发明人： Jae Ho LEE ,  Yang Su KIM ,  Han Seung KOO ,  Sang Jung RA ,  Dong Joon CHOI ,  Nam Ho HUR

IPC分类号： H04L27/38

CPC分类号： H04L27/2601 ,  H04L27/3809

摘要： Provided is an automatic gain controlling device that may prevent deterioration in performance of an orthogonal frequency division multiplexing (OFDM) receiver, on a cable network that performs communication by an orthogonal frequency division multiplexing (OFDM) scheme using high-order quadrature amplitude modulation (QAM), the automatic gain controlling device including a power computing unit to compute a power of a signal received by the OFDM receiver, and a gain controller to control a gain of the received signal based on the computed power of the received signal.

摘要翻译： 提供了一种自动增益控制装置，其可以防止正交频分复用（OFDM）接收机在通过使用高阶正交幅度调制（QAM）的正交频分复用（OFDM）方案进行通信的有线网络上的性能的劣化 ），所述自动增益控制装置包括：功率计算单元，用于计算由所述OFDM接收器接收的信号的功率;以及增益控制器，用于基于所计算的所述接收信号的功率来控制所述接收信号的增益。

公开(公告)号：US20070139113A1

公开(公告)日：2007-06-21

申请号：US11506910

申请日：2006-08-21

申请人： Sang-Jung Ra ,  O-Hyung Kwon ,  Soo-In Lee

发明人： Sang-Jung Ra ,  O-Hyung Kwon ,  Soo-In Lee

IPC分类号： H03F3/45

CPC分类号： H03G3/3089

摘要： Provided is an automatic gain control (AGC) apparatus of a cable modem. The apparatus includes: a gain controller for measuring a power level of digital input signals transmitted from outside, accumulating the measured values of the digital input signals for a predetermined period, acquiring an average size of the signals, and calculating an error value between the average signal size and a predetermined signal size; an amplitude control unit for receiving error values adjusted by the gain controller and controlling an amplitude of the signal; a low pass filter for receiving the signal outputted from the amplitude control unit and performing low pass filtering on the signal; and a signal size control unit for receiving the signal obtained from filtering of the low pass filter and controlling the signal size.

摘要翻译： 提供了一种电缆调制解调器的自动增益控制（AGC）装置。 该装置包括：增益控制器，用于测量从外部发送的数字输入信号的功率电平，在预定时段内积累数字输入信号的测量值，获取信号的平均大小，以及计算平均值之间的误差值 信号尺寸和预定信号尺寸; 振幅控制单元，用于接收由所述增益控制器调整的误差值并控制所述信号的幅度; 低通滤波器，用于接收从幅度控制单元输出的信号，并对信号执行低通滤波; 以及信号尺寸控制单元，用于接收从低通滤波器的滤波获得的信号并控制信号大小。

公开(公告)号：US20110154393A1

公开(公告)日：2011-06-23

申请号：US12889033

申请日：2010-09-23

申请人： Sang-Jung RA

发明人： Sang-Jung RA

IPC分类号： H04N7/173 ,  H04N7/025

CPC分类号： H04N21/4384 ,  H04N21/6125 ,  H04N21/631 ,  H04N21/6371

摘要： An Internet Protocol Television (IPTV) Set-Top Box (STB) is provided to efficiently use a time gap caused by a channel switching. The IPTV STB may request a network switch to perform a channel switching operation so that a national service broadcast stream of a second channel is received, when a channel selection signal for the second channel is received while a national service broadcast stream of a first channel is received. Additionally, the IPTV STB may transmit a local service broadcast stream received from a broadcast stream receiver to a display device.

摘要翻译： 提供互联网协议电视（IPTV）机顶盒（STB）以有效地利用由信道切换引起的时间间隔。 IPTV STB可以请求网络交换机执行信道切换操作，以便在第一信道的国家业务广播流接收到第二信道的信道选择信号时接收第二信道的国家业务广播流 收到了 此外，IPTV STB可以将从广播流接收器接收的本地服务广播流发送到显示设备。

公开(公告)号：US07504884B2

公开(公告)日：2009-03-17

申请号：US11506910

申请日：2006-08-21

申请人： Sang-Jung Ra ,  O-Hyung Kwon ,  Soo-In Lee

发明人： Sang-Jung Ra ,  O-Hyung Kwon ,  Soo-In Lee

IPC分类号： H03G3/30

CPC分类号： H03G3/3089

摘要： Provided is an automatic gain control (AGC) apparatus of a cable modem. The apparatus includes: a gain controller for measuring a power level of digital input signals transmitted from outside, accumulating the measured values of the digital input signals for a predetermined period, acquiring an average size of the signals, and calculating an error value between the average signal size and a predetermined signal size; an amplitude control unit for receiving error values adjusted by the gain controller and controlling an amplitude of the signal; a low pass filter for receiving the signal outputted from the amplitude control unit and performing low pass filtering on the signal; and a signal size control unit for receiving the signal obtained from filtering of the low pass filter and controlling the signal size.

摘要翻译： 提供了一种电缆调制解调器的自动增益控制（AGC）装置。 该装置包括：增益控制器，用于测量从外部发送的数字输入信号的功率电平，在预定时段内积累数字输入信号的测量值，获取信号的平均大小，以及计算平均值之间的误差值 信号尺寸和预定信号尺寸; 振幅控制单元，用于接收由所述增益控制器调整的误差值并控制所述信号的幅度; 低通滤波器，用于接收从幅度控制单元输出的信号，并对信号执行低通滤波; 以及信号尺寸控制单元，用于接收从低通滤波器的滤波获得的信号并控制信号大小。