| Summary: | 碩士 === 國立暨南國際大學 === 通訊工程研究所 === 96 === In this thesis, we propose a voice hiding method based upon analog modulation technique. According to some characteristics (drawbacks) of human hearing system, we know that humans can not hear the speech signal of high frequency (most adults are unable to hear the signals of above 16 kHz). Therefore, we exploit the analog modulation technique to modulate every secret message into high frequency to hide the secret messages. One advantage of our method is that illegal receivers would not be conscious that some message is with secret messages. Thus, the protection of our crypto-method is quite good. However, the legal receivers get the processed-signal, he will get approximate secret signal by our decryption method.
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