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Published in:
2018 | OriginalPaper | Chapter
Simulation of Long-Distance Aerial Transmissions for Robust Audio Data Hiding
Author : Akira Nishimura
Published in: Advances in Intelligent Information Hiding and Multimedia Signal Processing
Publisher: Springer International Publishing
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Abstract
This paper proposes an evaluation framework for an audio data hiding system that can be used for long-distance aerial transmissions where the stego speech signal is emitted by outdoor loudspeakers of voice evacuation and mass notification systems. Typical disturbances of aerial transmissions are modeled and implemented by signal processing units in series. The results of computer simulations for long-distance (70–800 m) aerial transmissions show that a bilateral time-spread echo hiding combined with a novel frame synchronization technique exhibits better detection performance than the conventional time-spread echo hiding under extremely low signal-to-noise ratios of 0 and −5 dB. Moreover, high-frequency attenuation and frequency shifts at the receiving side degrade the detection performance of the time-spread echo hidings.