HIGH PAYLOAD DATA-HIDING METHOD IN AUDIO SIGNALS BASED ON A MODIFIED OFDM APPROACH

摘要

Abstract. This invention relates to a high-capacity data hiding method for audio signals following the OFDM concept. It is based on changing the phase component of the audio signal via an M-order Phase Shift Keying (MPSK) modulator on selected frequency samples of the audio signal. This approach allows the data hiding capacity and perceptual distortion to be controlled by the number of altered frequency components of the audio signal and the severity of this alteration. The data hiding capacity can be estimated a priori independently of the audio signal features. In addition, due to the relation of the proposed scheme with the traditional use of MPSK modulation, the BER of the encoded data is analytically derived, therefore, it is known in advance, allowing the integration of channel encoders. Results obtained with representative test cases show that the proposed algorithm provides an increase of one order of magnitude in data payload compared with state-of-the-art works.