| Presentation | 2013-11-15 Study on Semi-Scramble Method for Speech Signals Based on Phonemic Restoration Katsuhiko YAMAMOTO, Zhi ZHU, Masashi UNOKI, Naofumi AOKI, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Speech scramble method can encrypt the digital audio signal for guaranteeing the confidentiality of speech content. This is a very important technique for preventing eavesdropping and unauthorized copying. There are typical methods such as scramble methods based on speech codecs and reverse scrambling in the frequency domain. However, there seems to be impossible for completely recovering the scrambled speech signal into the original signal. Moreover, nobody can hear out the partial speech content from speech signals scrambled by these methods. This paper proposes a speech scramble method based on random-bit shift of quantization bits using the public key. This paper, then, proposes a semi-scramble method for speech signals based on phonemic restoration, by making flexible use of the proposed method. We evaluated confidentiality and efficiency of the proposed methods by carrying out two objective tests (SER and PESQ). As the results, we confirmed that the speech signals can be fully restored from the scrambled speech by the proposed methods. In addition, we also confirmed that the semi-scrambled speech can be perceived as the original one. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | scramble method / semi-scramble method / phonemic restoration / quantization-bit shifting |
| Paper # | EA2013-78,EMM2013-78 |
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| Conference Information | |
| Committee | EA |
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| Conference Date | 2013/11/7(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Engineering Acoustics (EA) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Study on Semi-Scramble Method for Speech Signals Based on Phonemic Restoration |
| Sub Title (in English) | |
| Keyword(1) | scramble method |
| Keyword(2) | semi-scramble method |
| Keyword(3) | phonemic restoration |
| Keyword(4) | quantization-bit shifting |
| 1st Author's Name | Katsuhiko YAMAMOTO |
| 1st Author's Affiliation | School of Information Science, Japan Advanced Institute of Science and Technology() |
| 2nd Author's Name | Zhi ZHU |
| 2nd Author's Affiliation | School of Information Science, Japan Advanced Institute of Science and Technology |
| 3rd Author's Name | Masashi UNOKI |
| 3rd Author's Affiliation | School of Information Science, Japan Advanced Institute of Science and Technology |
| 4th Author's Name | Naofumi AOKI |
| 4th Author's Affiliation | Guraduate School of Information Science and Technology, Hokkaido University |
| Date | 2013-11-15 |
| Paper # | EA2013-78,EMM2013-78 |
| Volume (vol) | vol.113 |
| Number (no) | 290 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |