| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an electronic watermark adding device, a method thereof, and a program thereof, reducing degradation in audio quality of an audio signal to which electronic watermark information is added.SOLUTION: A stereo signal that is inputted is converted to a signal in a frequency range. A set of time axis and frequency axis of the converted signal is made to correspond to a set of two axes of a two-dimensional image as an electronic watermark and then, a two-dimensional image, as the electronic watermark, is added to the converted signal.</p> |
