公开(公告)号：GB2343818A

公开(公告)日：2000-05-17

申请号：GB9922676

申请日：1999-09-27

Applicant: IBM

Inventor： KOBAYASHI SEIJI ,  CHEN DEAN D ,  OHSHIMA 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 ,  H04H1/00

Abstract: Additional information (eg copyright information) is embedded into audio data such that the sonic modification caused by the embedding is not perceptible to humans, whilst the additional information can be precisely recovered after audio processing. For embedding the audio data is transformed into frequency components 120 , and for each frequency component the modification level of the audio data into which the additional information 180 can be embedded is determined 130 . A mask is generated 160/170 and used for embedding the additional information in the determined modification level 140 . The modified frequency components of the audio data are then converted back into audio data using an inverse transformation 190 . In a detector (Fig. 2) the audio data is transformed into frequency components 220 and the start point of the additional information is determined 250 . A detection mask is thence produced 270/280 and used to detect the additional information 260 from the determined start point in the transformed audio data.

公开(公告)号：GB2343818B

公开(公告)日：2004-01-21

申请号：GB9922676

申请日：1999-09-27

Applicant: IBM

Inventor： KOBAYASHI SEIJI ,  CHEN DEAN D ,  OHSHIMA 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 ,  H04H1/00

Abstract: A method and a system is provided for embedding and detecting additional information, such as copyright information, in audio data, so that a modification in the sonic quality due to the embedding is imperceptible to human beings, and does not drastically deteriorate the sonic quality.