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Magnitude Spectrum Speech Hiding

This paper presents a speech-in-speech hiding framework 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 technique used exploits the low-pass spectral properties of the Fourier magnitude of a host speech signal to embed another speech signal in the low-amplitude-high-frequency region of the host speech signal's spectral magnitude. Experimental evaluations on real male and female voice segments show that our technique is capable of hiding one speech message inside another host speech segment to produce a stego speech segment that is indistinguishable from the original host speech, while being able to extract the hidden speech message without any degradations in quality.