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arXiv 1111.0024cs.SDcs.CRcs.LGeess.AS
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低SNR环境下与文本无关的加密说话人识别

Text-Independent Speaker Recognition for Low SNR Environments with Encryption

Aman Chadha, Divya Jyoti, M. Mani Roja

摘要:

识别系统通常被设计为在系统的访问控制级别上对用户进行认证。已经开发了许多使用音调估计过程的话音识别方法,这些方法在低信噪比(SNR)环境中非常脆弱,因此,这些程序无法提供所需水平的准确性和鲁棒性。此外,大多数与文本无关的说话人识别程序无法应对通过篡改样本或参考数据库来获得访问权限的未经授权的尝试。所提出的文本无关的话音识别系统利用多级密码术,以保持数据的完整性,而在运输或存储。加密和解密遵循与伪随机噪声叠加的基于变换的方法,而对于音调检测,使用自相关音调提取算法的修改版本。实验结果表明,该算法可以在信噪比增加的范围内,以指数级降低的均方误差对待测信号进行解密。此外,它优于传统的算法在实际的识别任务,即使在嘈杂的环境中。因此,使用所提出的方法获得的识别率与其他传统的方法用于说话人辨识进行了比较。

英文摘要:

Recognition systems are commonly designed to authenticate users at the access control levels of a system. A number of voice recognition methods have been developed using a pitch estimation process which are very vulnerable in low Signal to Noise Ratio (SNR) environments thus, these programs fail to provide the desired level of accuracy and robustness. Also, most text independent speaker recognition programs are incapable of coping with unauthorized attempts to gain access by tampering with the samples or reference database. The proposed text-independent voice recognition system makes use of multilevel cryptography to preserve data integrity while in transit or storage. Encryption and decryption follow a transform based approach layered with pseudorandom noise addition whereas for pitch detection, a modified version of the autocorrelation pitch extraction algorithm is used. The experimental results show that the proposed algorithm can decrypt the signal under test with exponentially reducing Mean Square Error over an increasing range of SNR. Further, it outperforms the conventional algorithms in actual identification tasks even in noisy environments. The recognition rate thus obtained using the proposed method is compared with other conventional methods used for speaker identification.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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