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http://hdl.handle.net/11133/894
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Title: | Short Time DFTヒルベルト変換にもちいられるプロトタイプフィルタの最適化 |
Other Titles: | Short Time DFT ヒルベルト ヘンカン ニ モチイラレル プロトタイプ フィルタ ノ サイテキカ On the Optimization of the Prototype Filter used in the Short Time DFT Hilbert Transformers |
Authors: | 岸, 政七 古賀, 裕規 KISHI, Masahichi KOGA, Hiroki |
Issue Date: | 31-Mar-1992 |
Publisher: | 愛知工業大学 |
Abstract: | Superior characteristics of the short time DFT Hilbert transformer is yielded through employing ideal proto-type filter of infinite frame number. From practical application of view, it becomes to be important to reduce frame number of this proto-type filter and the processing amount in Short Time DFT Hilbert transformers. Optimization of proto-type filters are discussed in this paper to realize small frame number filters equal to the infinite frame number filter in the functional facilities via both non-linear programming and functional analysis. The proto-type filters are optimized in the meanings of minimizing the ripples both on the pass-and elimination-bands and of getting the sharpness of the mainlobe. Optimized proto-type filters are verified with analyzing output signals through Hilbert transformers, which employ these filters, to yield both exactly unity in amplitude and half π radian in phase-shifting even if shorten frame number filters being employed. |
URI: | http://hdl.handle.net/11133/894 |
Appears in Collections: | 27号
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