一种提高嵌入率的语音融合隐藏改进算法

语音信号在较高的采样率下,采样数据具有冗余度。对于秘密语音信号,冗余度越大,算法的嵌入率越低。本文结合信号抽取插值方法,对已有的语音融合隐藏算法提出进一步的改进,以减小秘密语音的冗余度,提高算法的嵌入率。利用高质量的计算机网络这一信息传输途径,进行实验仿真,并从主客观两方面对算法的性能进行评估。实验结果表明,利用本文改进算法,秘密语音的嵌入率得到提高,且恢复的秘密语音信号质量较好,PESQ打分在4.0左右,可懂度高。算法具有较高的可行性。

An Improved Speech Fusion Hiding Algorithm with Higher Embedding Rate

With a high sampling rate, the sampled speech signal has a redundancy. For the secret speech signal, a greater redundancy leads to a lower embedding rate. Aiming at reducing the redundancy of secret speech and improving embedding rate, in this paper, an improved algorithm, which is based on existing speech fusion hiding algorithm, has been put forward combined with the signal decimation and interpolation method. Some simulation experiments are done through the high-quality computer network. And we evaluate the performance of the improved algorithm from two aspects of subjective and objective. The experimental results show that the embedding rate of secret speech is improved and the reconstructed secret speech has a good quality. The PESQ (Perceptual Evaluation of Speech Quality) of secret speech can reach 4.0, which has a high intelligibility. The improved algorithm has high performance in terms of feasibility.