An audio information hiding method based on DCT
Mei Dongxia, Wang Jun-ji · Microcomputer Information · 2009
A novel information hiding algorithm for secret speech communication is proposed. First, IMBE (improved multi-bandexited) coding is used for secret speech, and the bits are arragned to form security speech.Then public speech is converted into segments and DCT (discrete cosine transform) is performed. The hiding bit is embedded in the intermediate frequency point of Discrete Consine Transform(DCT) by quantizing process. Detector extract the embedded information without the original digital audio signal,and recovers security speech by IMBE decoder. Emulational experiment results show the speech which is embedded with information has transparent feature,and algorithm is strongly robust to many attacks such as resampling, compression, filter and so on.