| Presentation | 2002/2/25 A Study on Improvement of Colord Noise Reduction Method Using Estimated Noise Spectrum Yoshifumi IWASHITA, Arata KAWAMURA, Kensaku FUJII, Yoshio ITOH, Yutaka FUKUI, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In this paper, we propose a noise reduction method using linear predictor and adaptive digital filter. It is known that the coefficients of the linear predictor converge such that the prediction error signal becomes white. Reconstructing the noise spectrum from the white signal obtained as the prediction error signal is achieved by estimating the noise spectrum. This estimation is performed by the adaptive digital filter which is used as system identification. Noise reduction is achieved by subtracting the reconstructed noise from the input signal which is a voice mixed with noise. However, under the low signal to noise ratio (S/N), it is difficult to estimate the voice spectrum by the linear predictor. Then, the whitening ability of the linear predictor degrades, and the S/N of enhanced signal degrades too. To improve this problem we consider pre-linear predictor using coefficients control method. The prelinear predictor filter can improve the S/N of the input signal by using the control method for updating the coefficients of the linear predictor. Since the signal obtained as the output of the pre-linear predictor using coefficients control method can be used as the input signal of the secondary linear predictor used for whitening the signal, the signal whitening ability of the secondary linear predictor can be improved. Some experiment results show the effectiveness of the proposed method. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | noise reduction / linear prediction / recomposition of noise |
| Paper # | CS2001-133 |
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| Committee | CS |
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| Conference Date | 2002/2/25(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Communication Systems (CS) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Study on Improvement of Colord Noise Reduction Method Using Estimated Noise Spectrum |
| Sub Title (in English) | |
| Keyword(1) | noise reduction |
| Keyword(2) | linear prediction |
| Keyword(3) | recomposition of noise |
| 1st Author's Name | Yoshifumi IWASHITA |
| 1st Author's Affiliation | Faculty of Engineering, Tottori University() |
| 2nd Author's Name | Arata KAWAMURA |
| 2nd Author's Affiliation | Faculty of Engineering, Tottori University |
| 3rd Author's Name | Kensaku FUJII |
| 3rd Author's Affiliation | Faculty of Engineering, Himeji Institute of Technology |
| 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 | 2002/2/25 |
| Paper # | CS2001-133 |
| Volume (vol) | vol.101 |
| Number (no) | 669 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |