| Presentation | 1998/5/28 Performance Improvement of Adaptive Filters using Modified DFT Pair Yoshihisa Hamahashi, Isao Nakanishi, Akinori Tsuji, Yoshio Itoh, Yutaka Fukui, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | When an input signal is colored, the speed of convergence of a time domain adaptive filter(TDAF) is slow as the eigenvalue spread of an input autocorrelation matrix increases. A frequency domain adaptive filter(FDAF) can achieve a faster convergence speed than a TDAF because the FDAF approximately diagonalizes the input autocorrelation matrix by using the discrete Fourier transform(DFT). However, the conventional FDAFs can not obtain a continuous output signal while at the same time maintaining stability of the convergence. For the solution of such problems, we had proposed the FDAF using the modified DFT(MDFT) pair and its advantages had been examined through the computer simulations. In addition, we proposed a method to reduce the computational complexity of the MDFT. In this paper, we propose the methods for improving the performance of the FDAF using the MDFT. To realize the real-time processing, all multiplications of the MDFT are replaced with the shift operations by using the approximate cosine function, and the signed regressor algorithm that requires no multiplication is introduced. The convergence performance is improved by introducing the spectral error method where the weights are updated by the spectral error between the desired and the input signals. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | frequency domain adaptive filter / modified DFT pair / computational complexity / spectral error method |
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| Conference Information | |
| Committee | DSP |
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| Conference Date | 1998/5/28(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Registration To | Digital Signal Processing (DSP) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Performance Improvement of Adaptive Filters using Modified DFT Pair |
| Sub Title (in English) | |
| Keyword(1) | frequency domain adaptive filter |
| Keyword(2) | modified DFT pair |
| Keyword(3) | computational complexity |
| Keyword(4) | spectral error method |
| 1st Author's Name | Yoshihisa Hamahashi |
| 1st Author's Affiliation | Faculty of Engineering, Tottori University() |
| 2nd Author's Name | Isao Nakanishi |
| 2nd Author's Affiliation | Faculty of Education, Tottori University |
| 3rd Author's Name | Akinori Tsuji |
| 3rd Author's Affiliation | Faculty of Engineering, Tottori University |
| 4th Author's Name | Yoshio Itoh |
| 4th Author's Affiliation | Faculty of Engineering, Tottori University |
| 5th Author's Name | Yutaka Fukui |
| 5th Author's Affiliation | Faculty of Engineering, Tottori University |
| Date | 1998/5/28 |
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| Volume (vol) | vol.98 |
| Number (no) | 79 |
| Page | pp.pp.- |
| #Pages | 8 |
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