Steganographic band width extension for the AMR codec of low-bit-rate modes
Steganographic band width extension for the AMR codec of low-bit-rate modes
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DOI：
10.21437/interspeech.2009-687
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发表时间：
2009
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通讯作者：
Akira Nishimura
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作者：
Akira Nishimura
提出了一种基于隐写的AMR窄带语音编解码器的带宽扩展(BWE)方法，这里称为BWE。使用扩展的基于量化的方法将高频信息嵌入到AMR编解码器的基音延迟数据中，该方法实现了比先前的隐写方法更大的嵌入容量和更高的感知声音质量。目标比特率模式低于7kbps，低于该水平之前的隐写BWE方法无法保持足够的声音质量。从嵌入的比特流解码的隐写BWE语音信号的声音质量与比特率小于6.7kbps的AMR-WB编解码器的宽带语音信号的声音质量相当，相对于由传统的AMR解码器从相同的比特流解码的语音信号，质量仅略有下降。
This paper proposes a bandwidth extension (BWE) method for the AMR narrow-band speech codec using steganography, which is called steganographic BWE herein. The high-band information is embedded into the pitch delay data of the AMR codec using an extended quantization-based method that achieves increased embedding capacity and higher perceived sound quality than the previous steganographic method. The target bit-rate mode is below 7 kbps, the level below which the previous steganographic BWE method did not maintain adequate sound quality. The sound quality of the steganographic BWE speech signals decoded from the embedded bitstream is comparable to that of the wide-band speech signals of the AMR-WB codec at a bit rate of less than 6.7 kbps, with only a slight degradation in the quality relative to speech signals decoded from the same bitstream by the legacy AMR decoder.