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New methods of hiding data in the pitch delay data of the adaptive multi-rate (AMR) speech codec are proposed. The proposed methods and the pitch quantization (PQ) method are compared in terms of embedding bit rate and objective speech quality obtained by the perceptual evaluation for speech quality (PESQ) algorithm. PQ, the previous method, quantizes the pitch delay data by embedding data. The proposed...
A technique for hiding data in audio signals using subband amplitude modulation was evaluated by a computer simulation in terms of robustness with respect to cascaded disturbances of reverberations, background noises, and the speech codec. Speech signals from 22 speakers and signals from 100 pieces of music in various genres were served to the host audio data. Computer simulation showed that the speech...
Reproducing stego audio signal via a loudspeaker and detecting embedded data from a recorded sound from a microphone are challenging with respect to the application of data hiding. A watermarking technique using subband amplitude modulation was applied to a system that displays text information synchronously with the watermarked audio signal transmitted in the air. The robustness of the system was...
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