Methods and apparatus for transmultiplexing a multi-channel signal
    1.
    发明申请
    Methods and apparatus for transmultiplexing a multi-channel signal 有权
    用于多路复用多信道信号的方法和装置

    公开(公告)号:US20020106009A1

    公开(公告)日:2002-08-08

    申请号:US09727558

    申请日:2000-12-01

    Applicant: MOTOROLA, INC.

    CPC classification number: H04J4/005

    Abstract: A transmultiplexer (202) is provided for transmultiplexing digitized signal samples (244) produced by a converter. The transmultiplexer (202) comprises a first Fourier transformer bank (304) configured to transform the digital signal samples (244) produced by the digitizer into frequency domain input signals (320). The transmultiplexer (202) also comprises a frequency domain shifter bank (306) configured to circularly shift the frequency domain input signals (320) to produce shifted signals (324). A frequency domain pre-filter bank (308) is configured to perform a first fast convolution with the shifted signals (324) and a first discrete Fourier transform of a first filtering function to produce filtered input signals (330), and a combining Fourier transformer (310) is configured to transform the filtered input signals (330) to produce output signals (348) containing a sample corresponding to a down-converted channel.

    Abstract translation: 提供了一种多路复用器(202),用于对由转换器产生的数字化信号样本(244)进行多路复用。 多路复用器(202)包括被配置为将由数字转换器产生的数字信号采样(244)转换成频域输入信号(320)的第一傅里叶变换器组(304)。 多路复用器(202)还包括频域移位器组(306),其被配置为循环移位频域输入信号(320)以产生移位信号(324)。 频域预滤波器组(308)被配置为执行与移位的信号(324)的第一快速卷积和第一滤波函数的第一离散付里叶变换以产生经滤波的输入信号(330),以及组合傅立叶变换器 (310)被配置为变换经滤波的输入信号(330)以产生包含对应于下变频信道的样本的输出信号(348)。

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