| Presentation | 2009-12-17 Improvement of echo cancellation performance by using both of frequency and time domain adaptive algorithms Ryuichi OKA, Kensaku FUJII, Mitsuji MUNEYASU, Masakazu MORIMOTO, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper proposes a method without distinguishing double-talk and echo path change by using both of frequency and time domain adaptive algorithms. In acoustic echo canceller systems, the coefficients of adaptive filter are disturbed by three factors: the power fluctuation of reference signal (far-end talker's signal), the superposition of noise (near-end talker's signal) called double talk and echo path change. The disturbance caused by the first one, can be prevented by applying block length control to block implementation algorithms. The other two can be solved by distinguishing the echo path change and the double talk and by increasing and decreasing the step size in the former and the latter cases, respectively. However, it is difficult to distiguish them quickly and exactly. This paper hence proposes a step size control method decreasing the estimation error steadily without the distinguishment. For the control, this method uses a sub adaptive filter with a fixed large step size and fewer taps than those of a main adaptive filter. Naturally, this filter provides smaller residual echo than the main filter does. This control method applies the step size calculated using the residual echo to the main filter; consequently a large and small step size can be automatically provided in the echo path chnage and the double talk, respectively. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | echo canceller / double talk / echo path change / block length control / step size control |
| Paper # | SIS2009-38 |
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| Conference Information | |
| Committee | SIS |
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| Conference Date | 2009/12/10(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Smart Info-Media Systems (SIS) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Improvement of echo cancellation performance by using both of frequency and time domain adaptive algorithms |
| Sub Title (in English) | |
| Keyword(1) | echo canceller |
| Keyword(2) | double talk |
| Keyword(3) | echo path change |
| Keyword(4) | block length control |
| Keyword(5) | step size control |
| 1st Author's Name | Ryuichi OKA |
| 1st Author's Affiliation | University of Hyogo() |
| 2nd Author's Name | Kensaku FUJII |
| 2nd Author's Affiliation | University of Hyogo |
| 3rd Author's Name | Mitsuji MUNEYASU |
| 3rd Author's Affiliation | Kansai University |
| 4th Author's Name | Masakazu MORIMOTO |
| 4th Author's Affiliation | University of Hyogo |
| Date | 2009-12-17 |
| Paper # | SIS2009-38 |
| Volume (vol) | vol.109 |
| Number (no) | 338 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |