DATA COMMUNICATION METHOD, SYSTEM, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a data communication method, a data communication system, and a data communication program by which quality deterioration of data in which information is embedded is suppressed within a human detection limit.

SOLUTION: A coding means 11 codes a predetermined piece of data into digital signals of multiple bit per sample by log-PCM. An embedding means 12 embeds auxiliary information in a part of bits when a signal obtained by coding data based on a sample in which a part of bits is set to zero by each sample by ADPCM and a signal obtained by coding data based on a sample in which a part of bits is set to 1 become the same signal. A transmitting means transmits each sample, and a receiving means receives each transmitted sample. An extraction means 13 extracts the embedded auxiliary information from a part of bits of each sample in the same way as that of the embedding means 12. A decoding means 14 decodes each sample based on the log-PCM.

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