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    • 17. 发明授权
    • Front-end for digital video receiver and method for automatic gain control thereof
    • 数字视频接收机前端及其自动增益控制方法
    • US07978794B2
    • 2011-07-12
    • US11898841
    • 2007-09-17
    • Shin-Shiuan ChengMing-Yeong ChenShyuan Liao
    • Shin-Shiuan ChengMing-Yeong ChenShyuan Liao
    • H04L27/08
    • H04N5/4401H03G3/3052H04N5/52H04N21/4382
    • A method for automatic gain control of a front-end for a digital video receiver is provided. The method includes the following steps. First, a radio frequency signal is received and converted to an intermediate frequency signal. Then, the IF signal is amplified according to a gain. Next, the amplified IF signal is demodulated into a base-band signal, and the base-band signal is encoded into a transport stream. After that, a DC level of a pulse width modulation signal is controlled by at least one variable resistor to adjust the gain, the PWM signal being related to a setting of the gain. Afterwards, a BER measurement at each potential setting of the gain and the variable resistor under one or more power levels of the RF signal is read, and an optimum setting of the gain and the variable resistor is selected according to the BER measurements.
    • 提供了一种用于数字视频接收机的前端的自动增益控制的方法。 该方法包括以下步骤。 首先,接收射频信号并转换成中频信号。 然后,IF信号根据增益被放大。 接下来,将放大的IF信号解调为基带信号,并将基带信号编码为传输流。 之后,由至少一个可变电阻器控制脉冲宽度调制信号的直流电平来调节增益,该PWM信号与增益的设定有关。 然后,读取在RF信号的一个或多个功率电平下的增益和可变电阻的每个电位设置下的BER测量,并且根据BER测量选择增益和可变电阻的最佳设置。
    • 19. 发明授权
    • Impulsive noise suppressor and method thereof
    • 脉冲噪声抑制器及其方法
    • US07787549B2
    • 2010-08-31
    • US11698278
    • 2007-01-26
    • Shin-Shiuan ChengYen-Wen YangKuo-Shih Tsai
    • Shin-Shiuan ChengYen-Wen YangKuo-Shih Tsai
    • H04K1/10H04L27/28
    • H04L27/2647H04B1/1036H04L27/3809
    • An impulsive noise suppresser and method thereof is provided. The impulsive noise suppresser includes an automatic gain control unit, variable gain amplification unit, impulsive detection unit and impulsive suppression unit. The automatic gain control unit determines a gain value according to a PAPR. The variable gain amplification unit amplifies a reception signal by the gain value. The gain value is determined such that the amplified reception signal as unaffected by the impulsive noise can have an amplitude range smaller than a predetermined range. The impulsive detection unit is coupled to the variable gain amplification unit for determining whether the amplified reception signal is larger than a maximum value of the predetermined range and outputting an impulsive alarm signal if the reception signal is larger than the maximum value. The impulsive suppression unit suppresses the impulsive noise as receiving the impulsive alarm signal, and then outputs an output signal.
    • 提供脉冲噪声抑制器及其方法。 脉冲噪声抑制器包括自动增益控制单元,可变增益放大单元,脉冲检测单元和脉冲抑制单元。 自动增益控制单元根据PAPR确定增益值。 可变增益放大单元通过增益值放大接收信号。 确定增益值使得不受脉冲噪声影响的放大的接收信号可以具有小于预定范围的幅度范围。 脉冲检测单元耦合到可变增益放大单元,用于确定放大的接收信号是否大于预定范围的最大值,并且如果接收信号大于最大值则输出脉冲报警信号。 脉冲抑制单元在接收脉冲报警信号时抑制脉冲噪声,然后输出输出信号。
    • 20. 发明申请
    • Front-end for digital video receiver and method for automatic gain control thefeof
    • 数字视频接收机的前端和自动增益控制的方法
    • US20090074118A1
    • 2009-03-19
    • US11898841
    • 2007-09-17
    • Shin-Shiuan ChengMing-Yeong ChenShyuan Liao
    • Shin-Shiuan ChengMing-Yeong ChenShyuan Liao
    • H04L27/08
    • H04N5/4401H03G3/3052H04N5/52H04N21/4382
    • A method for automatic gain control of a front-end for a digital video receiver is provided. The method includes the following steps. First, a radio frequency signal is received and converted to an intermediate frequency signal. Then, the IF signal is amplified according to a gain. Next, the amplified IF signal is demodulated into a base-band signal, and the base-band signal is encoded into a transport stream. After that, a DC level of a pulse width modulation signal is controlled by at least one variable resistor to adjust the gain, the PWM signal being related to a setting of the gain. Afterwards, a BER measurement at each potential setting of the gain and the variable resistor under one or more power levels of the RF signal is read, and an optimum setting of the gain and the variable resistor is selected according to the BER measurements.
    • 提供了一种用于数字视频接收机的前端的自动增益控制的方法。 该方法包括以下步骤。 首先,接收射频信号并转换成中频信号。 然后,IF信号根据增益被放大。 接下来,将放大的IF信号解调为基带信号,并将基带信号编码为传输流。 之后,由至少一个可变电阻器控制脉冲宽度调制信号的直流电平来调节增益,该PWM信号与增益的设定有关。 然后,读取在RF信号的一个或多个功率电平下的增益和可变电阻的每个电位设置下的BER测量,并且根据BER测量选择增益和可变电阻的最佳设置。