Title: Digital medium frequency filtering method
Application Number: 200610155457 Application Date: 2006.12.26
Publication Number: 1988379 Publication Date: 2007.06.27
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03H17/02
Applicant(s) Name: Sanwei Communication Co., Ltd., Zhejiang Address:
Inventor(s) Name: Zhang Fuxing;Wu Zhijian;Zhang Guofeng;Dai Shaogang
Attorney & Agent: chenji liang
Abstract:
    This invention relates to a digital IF filter method including: filtering analog IF signals with the input frequency of 140MHz and bandwidth smaller than 31.25MHz with a digital filter module orderly after being sampled by an A/D module, interpolating two times and with a low pass filter module 1 then to carry out low pass filter to the interpolated data, carrying out mixing operation with a mixing filter module to be interpolated two times and interpolated or two times by a high pass filter module then to carry out high pass filter to the data, carrying out signal mixing to the output signals passing through two times of interpolation and the low pass filter module 2 and 250 MHz local signals to be output by the A/D modile and low pass filter or band pass filter to get IF output with the central frequency of 160MHz.
Time: 5
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