A method of embedding a covert audio message in a cover utterance for secure communication is presented. The covert message is represented in a compressed form with possibly encryption and/or encoding for added security. One bit in each of the samples of a given cover utterance is altered in accordance with the data bits and a key. The same key is used to retrieve the embedded bits at the receiver. The results, based on cover signals from a clean TIMIT utterance and a noisy aircraft cockpit utterance, show that the technique meets several major criteria for successful covert communication.
This paper presents the initial results of analysis of nonlinear spectral features for classifying truthful and deceptive speech. These features are derived on a Bark scale based on the psychoacoustic masking property of human speech perception. Truthful and deceptive speeches are established a posteriori by a male speaker under jeopardy. Test results using significant energy features at Bark bands and a neural network have a potential to show delicate variations between truthful and deceptive utterances.
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