Speech Information Hiding by Modification of LSF Quantization Index in CELP Codec
Speech Information Hiding by Modification of LSF Quantization Index in CELP Codec
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发表时间：
2020-12
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通讯作者：
Candy Olivia Mawalim;Shengbei Wang;M. Unoki
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作者：
Candy Olivia Mawalim;Shengbei Wang;M. Unoki
一种有前景的保护数字语音通信的方法是将信息隐藏在语音中。现有研究中提出的语音信息隐藏方法在处理编码过程时（例如码激励线性预测（CELP）编解码器）大多缺乏鲁棒性。CELP编解码器提供以较低比特率表示编码信号的码本。作为语音编码中的基本特征，线谱频率（LSF）通常被包括在码本中。因此，LSF被认为是一个有前景的媒体信息隐藏是强大的CELP编解码器。在本文中，我们提出了一种语音信息隐藏方法，修改的最低有效位的LSF量化CELP编解码器获得。我们研究了我们提出的方法的可行性，通过客观评价的检测精度和不可闻性。评估结果证实了我们提出的方法的可靠性，并有一些进一步的潜在改进（多嵌入和不同的分割长度）。结果还表明，我们提出的方法对几种信号处理操作（例如，重采样、添加高斯噪声和几种CELP编解码器（即，联邦标准-1016 CELP、G.711和G.726）。
A prospective method for securing digital speech communication is by hiding the information within the speech. Most of the speech information hiding methods proposed in prior research are lacking in robustness when dealing with the encoding process (e.g. the code-excited linear prediction (CELP) codec). The CELP codecs provide a codebook that represents the encoded signal at a lower bit rate. As essential features in speech coding, line spectral frequencies (LSFs) are generally included in the codebook. Consequently, LSFs are considered as a prospective medium for information hiding that is robust against CELP codecs. In this paper, we propose a speech information hiding method that modifies the least significant bit of the LSF quantization obtained by a CELP codec. We investigated the feasibility of our proposed method by objective evaluation in terms of detection accuracy and inaudibility. The evaluation results confirmed the reliability of our proposed method with some further potential improvement (multiple embedding and varying segmentation lengths). The results also showed that our proposed method is robust against several signal processing operations, such as resampling, adding Gaussian noise, and several CELP codecs (i.e., the Federation Standard-1016 CELP, G.711, and G.726).