| Paper Abstract and Keywords |
| Presentation |
2005-01-27 16:20
Hands-Free Speech Recognition Using Spatial Subtraction Array and Known Noise Superimposition
Yasuaki Ohashi, Tsuyoki Nishikawa, Hiroshi Saruwatari, Kiyohiro Shikano (NAIST) |
| Abstract |
(in Japanese) |
(See Japanese page) |
| (in English) |
We propose a spatial subtraction array (SSA) and known noise superimposition to achieve a robust hands-free speech recognition under noisy environments. In the proposed SSA, noise reduction is achieved
by subtracting the estimated noise power spectrum from the target speech power spectrum to be enhanced in the mel-scale filter bank domain.
This offers a realization of error-robust spatial spectral subtraction with few computational complexities because the parameters are optimized in the small number of mel-scale filter bank.
Moreover, since SSA directly outputs mel-frequency cepstrum coefficient (MFCC), SSA does not require the transformation into the time-domain waveform. In addition, we introduce known noise superimposition technique in the mel-scale filter bank domain, and utilize the matched acoustic model for the known noise. This can compensate the acoustic model mismatch and mask the residual noise component in SSA.
The experimental results obtained under a real environment reveal that word accuracy of SSA with the noise superimposition technique is 5\% higher than that using clean model. Moreover, word accuracy of the proposed method is greater than that of the conventional method even when the target user moves between $\pm10^{\circ}$ around the microphone array. |
| Keyword |
(in Japanese) |
(See Japanese page) |
| (in English) |
hands-free speech recognition / microphone array signal processing / noise reduction / known noise superimposition / matched model / / / |
| Reference Info. |
IEICE Tech. Rep., vol. 104, no. 614, EA2004-123, pp. 37-42, Jan. 2005. |
| Paper # |
EA2004-123 |
| Date of Issue |
2005-01-20 (EA) |
| ISSN |
Print edition: ISSN 0913-5685 |
| Download PDF |
|
| Conference Information |
| Committee |
EA |
| Conference Date |
2005-01-27 - 2005-01-28 |
| Place (in Japanese) |
(See Japanese page) |
| Place (in English) |
Kansai Univ. |
| Topics (in Japanese) |
(See Japanese page) |
| Topics (in English) |
Active Noise Control, Echo Canceler, Noise Canceler, etc. |
| Paper Information |
| Registration To |
EA |
| Conference Code |
2005-01-EA |
| Language |
Japanese |
| Title (in Japanese) |
(See Japanese page) |
| Sub Title (in Japanese) |
(See Japanese page) |
| Title (in English) |
Hands-Free Speech Recognition Using Spatial Subtraction Array and Known Noise Superimposition |
| Sub Title (in English) |
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| Keyword(1) |
hands-free speech recognition |
| Keyword(2) |
microphone array signal processing |
| Keyword(3) |
noise reduction |
| Keyword(4) |
known noise superimposition |
| Keyword(5) |
matched model |
| Keyword(6) |
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| Keyword(7) |
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| Keyword(8) |
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| 1st Author's Name |
Yasuaki Ohashi |
| 1st Author's Affiliation |
Nara Institute of Science and Technology (NAIST) |
| 2nd Author's Name |
Tsuyoki Nishikawa |
| 2nd Author's Affiliation |
Nara Institute of Science and Technology (NAIST) |
| 3rd Author's Name |
Hiroshi Saruwatari |
| 3rd Author's Affiliation |
Nara Institute of Science and Technology (NAIST) |
| 4th Author's Name |
Kiyohiro Shikano |
| 4th Author's Affiliation |
Nara Institute of Science and Technology (NAIST) |
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| Speaker |
Author-1 |
| Date Time |
2005-01-27 16:20:00 |
| Presentation Time |
30 minutes |
| Registration for |
EA |
| Paper # |
EA2004-123 |
| Volume (vol) |
vol.104 |
| Number (no) |
no.614 |
| Page |
pp.37-42 |
| #Pages |
6 |
| Date of Issue |
2005-01-20 (EA) |