| 摘要 |
PROBLEM TO BE SOLVED: To provide an embedding device of interference noise to acoustic signals, capable of making the interference noise audible by inaudibly embedding the interference noise in a high-frequency part of the acoustic signals of a protection object, generating aliasing by analog copy or downsampling compression, and shifting the embedded interference noise to a low-frequency side.SOLUTION: Broadband acoustic signals are obtained by performing up-sampling to acoustic signals (S1), acoustic frames of N samples are read from the broadband acoustic signals (S2), frequency conversion is performed to the acoustic frames to obtain spectra (S3), and modification is applied so that an absolute value of a signal becomes a prescribed value for a prescribed signal component included in a range in which a frequency is Fs/2 or higher and Fs or lower among the signal components of the spectra of the odd-numbered acoustic frames (S4). |
