CONCEALED DATA GENERATION DEVICE, CONCEALED DATA GENERATION METHOD, CONCEALING DEVICE, CONCEALING METHOD, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To keep a tone color of reproduced music equal to that of original sounds while enhancing a masking effect on voice signals and to cause a prescribed masking effect to function even in the case that music is reproduced with a reduced sound volume.

SOLUTION: In frequency analysis processing 32, a voice maximum value spectrum Vv(j) and a music average value spectrum Vm(j) are calculated. In filter function generation processing 33, a division value spectrum Div(j) being values obtained by dividing values based on the voice maximum value spectrum Vv(j) by values based on the music average value spectrum Vm(j) per mutually corresponding frequency j is calculated, and further, respective values of the division value spectrum Div(j) are multiplied by values based on an auditory sensitivity correction curve L(j) per mutually corresponding frequency j to generate a filter function F(j). In filtering processing 34, each frame f is subjected to Fourier transform and is multiplied by the filter function F(j) and is subjected to inverse Fourier transform to generate concealed data 7.

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