Abstract
Bandwidth extension can be defined as a deliberate process of expanding the frequency range (bandwidth) for signal transmission. Its significant advancement in recent years has led to the technology being adopted commercially in several areas, including psychoacoustic bass enhancement of small loudspeakers and the high frequency enhancement of perceptually coded audio. In this paper, a novel bandwidth extension method based on chaotic data hiding is proposed. More specifically, a hidden channel is created by removing the imperceptible components from the transmitted audio or video. The out-of-band information is then encoded and embedded into the hidden channel without degrading the quality of the bandlimited signal. At the receiver, when the out-of-band information is extracted from the hidden channel, it can be used to combine with the bandlimited signal, providing a signal with a wider bandwidth. To balance the tradeoff between robustness and payload of transmitting the out-of-band information through the hidden channel, the technique of chaotic code division multiple access (CDMA) is employed. Since minimizing the multiple access interference (MAI) is crucial to the detection performance of a CDMA system, we employ a hybrid algorithm based on genetic programming (GP) and DNA computing to generate the desired spreading sequences with low cross-correlation. The effectiveness of the proposed method is validated by applying it to enhance telephony speech quality.
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The associate editor coordinating the review of this manuscript and approving it for publication was Prof. Wing-Kuen Ling.
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Chen, S., Leung, H. A Bandwidth Extension Technique for Signal Transmission Using Chaotic Data Hiding. Circuits Syst Signal Process 27, 893–913 (2008). https://doi.org/10.1007/s00034-008-9066-3
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DOI: https://doi.org/10.1007/s00034-008-9066-3