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1. 发明申请

US20080062029A1 APPARATUS AND METHOD FOR DEMODULATING A MODULATED SIGNAL 有权
标题翻译：用于调制调制信号的装置和方法
公开(公告)号：US20080062029A1
公开(公告)日：2008-03-13
申请号：US11836138
申请日：2007-08-08
申请人： Xu Changqing , Li Zhiping , Hu Saigui , Tan Kai Ren , Wang Tingwu , Tomisawa Masayuki
发明人： Xu Changqing , Li Zhiping , Hu Saigui , Tan Kai Ren , Wang Tingwu , Tomisawa Masayuki
IPC分类号： H03M1/12
CPC分类号： H04L27/2075 , H04L27/0014
摘要： An apparatus for demodulating a modulated signal comprises an analog to digital converter (2, 12) for converting an analog modulated input signal to a digital signal. The analog to digital converter is arranged to sample the input signal at a predetermined sampling rate. A digital down converter (4, 14) then receives the digital signal at the sampling rate. The digital down converter has an associated digital intermediate frequency and reduces the frequency of the digital signal to one quarter of the sampling rate. A low pass filter (6, 16) filters selected frequencies from the digital signal. A frequency offset stage (8, 18) applies a modification to the frequency of the filtered signal to reduce frequency offset therein, and a differential demodulator (10, 20) demodulates the signal after modifying the frequency to reduce the frequency offset. There is also disclosed a method for demodulating a signal.
摘要翻译：用于解调调制信号的装置包括用于将模拟调制输入信号转换为数字信号的模数转换器（2,12）。模数转换器被布置成以预定的采样速率对输入信号进行采样。数字降压转换器（4,14）然后以采样速率接收数字信号。数字下变频器具有相关的数字中频，并将数字信号的频率降低到采样率的四分之一。低通滤波器（6,16）从数字信号滤波所选择的频率。频率偏移级（8,18）对经滤波的信号的频率进行修改以减少其中的频率偏移，并且差分解调器（10,20）在修改频率之后对该信号进行解调以降低频率偏移。还公开了一种解调信号的方法。

2. 发明授权

US07541966B2 Apparatus and method for demodulating a modulated signal 有权
标题翻译：用于解调调制信号的装置和方法
公开(公告)号：US07541966B2
公开(公告)日：2009-06-02
申请号：US11836138
申请日：2007-08-08
申请人： Xu Changqing , Li Zhiping , Hu Saigui , Tan Kai Ren , Wang Tingwu , Tomisawa Masayuki
发明人： Xu Changqing , Li Zhiping , Hu Saigui , Tan Kai Ren , Wang Tingwu , Tomisawa Masayuki
IPC分类号： G08C19/12
CPC分类号： H04L27/2075 , H04L27/0014
摘要： An apparatus for demodulating a modulated signal comprises an analog to digital converter (2, 12) for converting an analog modulated input signal to a digital signal. The analog to digital converter is arranged to sample the input signal at a predetermined sampling rate. A digital down converter (4, 14) then receives the digital signal at the sampling rate. The digital down converter has an associated digital intermediate frequency and reduces the frequency of the digital signal to one quarter of the sampling rate. A low pass filter (6, 16) filters selected frequencies from the digital signal. A frequency offset stage (8, 18) applies a modification to the frequency of the filtered signal to reduce frequency offset therein, and a differential demodulator (10, 20) demodulates the signal after modifying the frequency to reduce the frequency offset. There is also disclosed a method for demodulating a signal.
摘要翻译：用于解调调制信号的装置包括用于将模拟调制输入信号转换为数字信号的模数转换器（2,12）。模数转换器被布置成以预定的采样速率对输入信号进行采样。数字降压转换器（4,14）然后以采样速率接收数字信号。数字下变频器具有相关的数字中频，并将数字信号的频率降低到采样率的四分之一。低通滤波器（6,16）从数字信号滤波所选择的频率。频率偏移级（8,18）对经滤波的信号的频率进行修改以减少其中的频率偏移，并且差分解调器（10,20）在修改频率之后解调该信号以减少频率偏移。还公开了一种解调信号的方法。

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