基于多相濾波結(jié)構(gòu)的分數(shù)比采樣率轉(zhuǎn)換
Fractional ratio sampling rate conversion based on polyphase filter architecture
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摘要: 帶通信號的欠采樣中,分數(shù)比采樣率轉(zhuǎn)換是一個頗費計算量的復(fù)雜過程。用低階的線性內(nèi)插會帶來較大的鏡像噪聲。該文基于多相濾波的結(jié)構(gòu),按照最小運算量準(zhǔn)則,綜合處理分數(shù)比采樣率轉(zhuǎn)換中內(nèi)插、濾波、抽取的運算過程,提出了三種高效的轉(zhuǎn)換實現(xiàn)模式。文章比較了三種模式的計算效率,并給出典型信號的計算機仿真結(jié)果。
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關(guān)鍵詞:
- 多相濾波; 分數(shù)比采樣率轉(zhuǎn)換; 帶通內(nèi)插和抽取
Abstract: In this under-sampling of pass-band signal, the fractional ratio Sampling Rate Conversion(SRC) is a procedure which requires a lot of computations. The low-order linear interpolating will incur more aliase noise. Based on the polyphase filter architecture and minimum-operation principle, this paper integrates the interpolating, filtering, and decimating operations in the course of SRC, and presents three architectures for efficient conversion. It also compares the operation efficiencies of the three architectures, and finally gives the computer simulation results on a typical signal. -
C. Dick, F. Harris, PPGA interpolators using polynomial filter, Proc. ICSPAT, Toronto, Canada,1998, 684-688.[2]R.G. Vaughan, L. S. Neil, D. white, The theory of bandpass sampling, IEEE Trans. on SP, 1991,SP-39(9), 1973-1984.[3]胡廣書,數(shù)字信號處理-理論算法與實現(xiàn),北京,清華大學(xué)出版社,1997年8月,126-131.[4]A.J. Coulson, R. G. Vaughan, M. A. Poletli, Frequency-shifting using bandpass sampling, IEEE Trans. on SP, 1994, SP-42(6), 1556-1559. -
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