一种基于声音的信息隐藏方法及其实现

给出了一种基于声音的信息隐藏技术，它采用数字调制技术将低速率数据调制在窄带音频载波中，然后将此信号与背景声音进行混合后发出；接收端将窄带载波滤出，解调后得到所隐藏的数据。由于信号带宽较窄，对背景声音的破坏很小，主观上无法察觉。同时，由于数据包含在声音频带中，且采用了高性能的纠错编码和信号检测技术，所以无论是复制(数字或模拟的)、压缩，甚至经过信道传输(如电话、无线等)等，接收端都可恢复出原始数据。实验结果证实了这种方法的有效性。

An Audio Based Information Encryption Method and Its Implementation

An audio based information encryption method was proposed along with it's implementation, which hides low rate data into sound by digital modulation of a narrow base band carrier. Because of it's narrow spectrum and robust error control coding and advanced signal detection scheme, data carrier affects the background sound very slightly while encrypted information can be transmitted through variance channels or stored either in digital or analog mode, and restored at the receiver. Experiment result has confirmed the validity of this kind of methed.