奈奎斯特抽样定理是对频率宽度有限长的模拟信号进行数字化处理的重要定理之一,而对于这类频宽有限信号中的特殊信号,即窄带信号而言,依据奈奎斯特抽样定理对信号进行抽样时会出现一些新问题.在指出窄带信号存在原因的基础上,以抽样信号的频谱不混叠为根本对窄带信号进行抽样,并使其与按照奈奎斯特定理抽样后的信号进行比较分析.借助通信原理相关知识予以在信道传输中进行分析,得出信号经窄带信号抽样定理处理后的优势所在.%The Nyquist sampling theorem is one of the important theorems for digital processing of analog signals with finite frequency width,but has some new problems while sampling the narrowband signal in the finite bandwidth ones. On the basis of the reason that the available narrowband signal exists the problems,the narrowband signal is sampled by taking the non-aliasing frequency spectrum of the sampling signal as the foundation,and compared with the signal after sampling according to the Ny-quist theorem. The signal in channel transmission is analyzed by means of related knowledge of communication priciple to get the advantages of the narrowband signal processed with sampling theorem.
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