公开(公告)号：JP2000172282A

公开(公告)日：2000-06-23

申请号：JP26924499

申请日：1999-09-22

Applicant: IBM

Inventor： KOBAYASHI SEISHI ,  CHIN TEIEN ,  OSHIMA YOSHIAKI ,  SHIMIZU SHUICHI ,  MORIMOTO NORISHIGE

IPC: G09C5/00 ,  G10K15/02 ,  G10L11/00 ,  G10L19/00 ,  G10L21/04 ,  G11B15/05 ,  G11B19/04 ,  G11B20/00 ,  G11B20/10 ,  G11B27/036 ,  H04H20/00 ,  H04H20/31 ,  H04N1/32

Abstract: PROBLEM TO BE SOLVED: To detect reliably the processing to the audio data while burying so as not to detect a change of tone quality due to burying of additional information with human auditory sense by burying the additional information in a changeable range of a frequency that the audio data are buried. SOLUTION: A frequency conversion block 120 calculates a frequency component of an audio signal. An auditory sense psychology model calculation block 130 calculates an area hard to differentiate the change based on a characteristic of a human ear. An additional information burying mask generation block 170 generates a mask used when the additional information is buried. An additional information burying block 140 buries the inaudible additional information in the audio signal. That is, the block 140 adds a signal/time companding/ detecting synchronizing signal to the frequency converted audio signal in the mask direction in an inaudible range based on the calculated auditory sense model. A frequency inverse conversion block 190 inversely converts the frequency converted audio signal.