Shuang-An Chou

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Echo hiding is an audio watermarking method where information is embedded in the echo delay. A bilateral time spread echo kernel is proposed to improve robustness against malicious attacks as well as enhance the detection performance by increasing the peak value of the kernel cepstrum at the echo delay time. Based on the spreading property of PN sequences(More)
Echo hiding embeds watermark information bit in the delay time. For imperceptibility, we propose a temporal masking technique to match the psycho acoustic model. Based on the spreading property of PN sequences and expansions of logarithm and binomial, two asymptotic detection gains are derived depending on the echo gain is small or large. This performance(More)
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