Frequency-domain data hiding based on the Matryoshka principle
International Journal of Advanced Media and Communication
Bandwidth extension of speech signals: a catalyst for the introduction of wideband speech coding?
IEEE Communications Magazine
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We introduce in this work a framework for speech-in-speech hiding for the purpose of reducing the storage and transmission overhead in electronic voice mail applications, as well as for steganography applications of hiding secret speech messages for voice mail security. The proposed technique exploits the low-pass spectral properties of speech signals to embed another parametric signal in the low-amplitude high-frequency part of a host speech signal spectral magnitude. Experimental tests on several speech signals show that our technique is capable of hiding narrowband speech CELP-based message inside another host wideband speech segment to produce a stego wideband speech segment that is indistinguishable from the original host speech, while being able to extract the hidden narrowband speech message without any degradations in quality.