DIGITAL FILTERING BY POLYPHASE NETWORK - APPLICATION TO SAMPLE-RATE ALTERATION AND FILTER BANKS

被引:203
作者
BELLANGER, MG [1 ]
BONNEROT, G [1 ]
COUDREUSE, M [1 ]
机构
[1] TELECOMMUN RADIOELECT & TELEPHONIQUES,PLESSIS ROBINSON,FRANCE
来源
IEEE TRANSACTIONS ON ACOUSTICS SPEECH AND SIGNAL PROCESSING | 1976年 / 24卷 / 02期
关键词
D O I
10.1109/TASSP.1976.1162788
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
The digital filtering process can be achieved by a set of phase shifters with suitable characteristics. A particular set, named polyphase network, is defined and analyzed. It permits the use of recursive devices for efficient sample-rate alteration. The comparison with conventional filters shows that, with the same active memory, a reduction of computation rate approaching a factor of 2 can be achieved when the alteration factor increases. A more substantial gain can be obtained in the direct realization of a uniform bank of recursive filters through combination of the polyphase network with a discrete Fourier transform (DFT) computer; savings in hardware also result from the low sensitivity of the structure to coefficient word lengths.
引用
收藏
页码:109 / 114
页数:6
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