| Presentation | 1999/2/19 Improvement of low-bit-rate speech coding under background noise conditions Hitoshi Ohmuro, Kazunori Mano, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper proposes a new method to improve the performance of a speech coder under background noise conditions. The fundamental structure of the proposed coder is based on pulse excited CELP which operates at 4 kbit/s. To improve the quality of noisy speech, this method models the noisy speech as mixture of a CELP excitation component,a short-time varying noise component and a long-time varying (or static) noise component. The noise components are estimated in the decoder using the CELP parameneters received from the encoder. The encoder classifies the input speech into three regions, voiced speech, unvoiced consonant and background noise. Out of the voiced speech regions, the gain is determined not to lose the original signal power. Our subjective listening test showed that the speech quality generated with our method was much better than that with the conventional method. Especially, the performance of our method under the 15-dB car noise condition was almost the same as that of ITU-T G.729 (8 kbits/s) |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | speech coding / low bit rate / 4 kbit/s / background noise / coding model / subjective quality |
| Paper # | SP98-145 |
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| Conference Information | |
| Committee | SP |
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| Conference Date | 1999/2/19(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | |
| Vice Chair | |
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| Paper Information | |
| Registration To | Speech (SP) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Improvement of low-bit-rate speech coding under background noise conditions |
| Sub Title (in English) | |
| Keyword(1) | speech coding |
| Keyword(2) | low bit rate |
| Keyword(3) | 4 kbit/s |
| Keyword(4) | background noise |
| Keyword(5) | coding model |
| Keyword(6) | subjective quality |
| 1st Author's Name | Hitoshi Ohmuro |
| 1st Author's Affiliation | NTT Cyber Spacc Laboratories() |
| 2nd Author's Name | Kazunori Mano |
| 2nd Author's Affiliation | NTT Cyber Spacc Laboratories |
| Date | 1999/2/19 |
| Paper # | SP98-145 |
| Volume (vol) | vol.98 |
| Number (no) | 611 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |