On the ability of adaptation of speech signals and data hiding

Authors:
Dora M. Ballesteros L;Juan M. Moreno A
Affiliations:
Department of Electronic Engineering, Technical University of Catalunya (UPC), Barcelona, Spain and Department of Telecommunications Engineering, University Military Nueva Granada (UMNG), Bogota, ...;Department of Electronic Engineering, Technical University of Catalunya (UPC), Barcelona, Spain
Venue:
Expert Systems with Applications: An International Journal
Year:
2012

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Abstract

The efficient wavelet masking is a scheme of speech-in-speech hiding based on the ability of adaptation of speech signals under the hypothesis ''any (speech) secret signal may seem similar to a (speech) host signal if its wavelet coefficients are sorted'' (Ballesteros L & Moreno A, 2012). In this paper, we delimitate the conditions under which the above hypothesis is true, as follows: (i) the secret and host signals must belong to legible voice signals, (ii) both signals must have the same sampling frequency, (iii) both signals must have the same time-frame, and finally (iv) the ratio between the non-zero coefficients of them should be in the interval [0.8 1.2]. Experimental tests were conducted to demonstrate the hypothesis on different cases: vowel to vowel, message to message and vowel & message, in three languages: English, French, and German. The parameter used to measure the similarity between the adapted secret message and the host signal is the squared Pearson correlation coefficient, r^2. The results demonstrate that the hypothesis is true under the theoretical conditions because in all the test cases r^2 was closed to 1 and the p-value was lower than 0.05.