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1. 发明申请

US20220157334A1 DETECTION OF LIVE SPEECH 有权
公开(公告)号：US20220157334A1
公开(公告)日：2022-05-19
申请号：US16953104
申请日：2020-11-19
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： César ALONSO
IPC分类号： G10L25/93 , G10L25/18 , G10L25/21 , G10L15/22 , G10L25/78
摘要： A method of detecting live speech comprises: receiving a signal containing speech; forming a framed version of the received signal that comprises a plurality of frames; forming a first subset of the plurality of frames, wherein each frame of the first subset contains a signal that contains voiced speech; forming a second subset of the plurality of frames, wherein each frame of the second subset contains a signal that contains unvoiced speech; forming a first frame that is representative of a sum of a plurality of frames of the first subset; forming a second frame that is representative of a sum of a plurality of frames of the second subset; performing a time-frequency transformation operation on the first frame, to form an average voiced frequency spectrum; performing a time-frequency transformation operation on the second frame, to form an average unvoiced frequency spectrum; obtaining one or more voiced features from the voiced frequency spectrum; and obtaining one or more unvoiced features from the unvoiced frequency spectrum. Based on the one or more voiced features and the one or more unvoiced features, a determination is made whether the speech is live speech, or not.

2. 发明申请

US20190005963A1 MAGNETIC DETECTION OF REPLAY ATTACK 审中-公开
公开(公告)号：US20190005963A1
公开(公告)日：2019-01-03
申请号：US16020406
申请日：2018-06-27
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： César ALONSO , John Paul LESSO
IPC分类号： G10L17/22 , H04R1/40 , G06F21/55
摘要： A method of detecting a replay attack on a voice biometrics system comprises: receiving an audio signal representing speech; detecting a magnetic field; determining if there is a correlation between the audio signal and the magnetic field; and if there is a correlation between the audio signal and the magnetic field, determining that the audio signal may result from a replay attack.

3. 发明申请

US20200043484A1 DETECTION OF REPLAY ATTACK 审中-公开
公开(公告)号：US20200043484A1
公开(公告)日：2020-02-06
申请号：US16050593
申请日：2018-07-31
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： John Paul LESSO , César ALONSO
IPC分类号： G10L15/20 , G10L15/22 , G06F21/32 , G10L21/0208
摘要： A method of detecting a replay attack comprises: receiving an audio signal representing speech; identifying speech content present in at least a portion of the audio signal; obtaining information about a frequency spectrum of each portion of the audio signal for which speech content is identified; and, for each portion of the audio signal for which speech content is identified: retrieving information about an expected frequency spectrum of the audio signal; comparing the frequency spectrum of portions of the audio signal for which speech content is identified with the respective expected frequency spectrum; and determining that the audio signal may result from a replay attack if a measure of a difference between the frequency spectrum of the portions of the audio signal for which speech content is identified and the respective expected frequency spectrum exceeds a threshold level.

4. 发明申请

US20210256971A1 DETECTION OF REPLAY ATTACK 有权
公开(公告)号：US20210256971A1
公开(公告)日：2021-08-19
申请号：US17261786
申请日：2019-07-31
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： John Paul LESSO , César ALONSO , Earl Corban VICKERS
IPC分类号： G10L15/20 , G06F21/32 , G10L15/22 , G10L21/0208
摘要： A method of detecting a replay attack comprises: receiving an audio signal representing speech; identifying speech content present in at least a portion of the audio signal; obtaining information about a frequency spectrum of each portion of the audio signal for which speech content is identified; and, for each portion of the audio signal for which speech content is identified: retrieving information about an expected frequency spectrum of the audio signal; comparing the frequency spectrum of portions of the audio signal for which speech content is identified with the respective expected frequency spectrum; and determining that the audio signal may result from a replay attack if a measure of a difference between the frequency spectrum of the portions of the audio signal for which speech content is identified and the respective expected frequency spectrum exceeds a threshold level.

5. 发明申请

US20200265834A1 DETECTION OF REPLAY ATTACK 审中-公开
公开(公告)号：US20200265834A1
公开(公告)日：2020-08-20
申请号：US16869176
申请日：2020-05-07
申请人： Cirrus Logic International Semiconductor Ltd.
发明人： John Paul LESSO , César ALONSO
IPC分类号： G10L15/20 , G10L21/0208 , G10L15/22 , G06F21/32
摘要： A method of detecting a replay attack comprises: receiving an audio signal representing speech; identifying speech content present in at least a portion of the audio signal; obtaining information about a frequency spectrum of each portion of the audio signal for which speech content is identified; and, for each portion of the audio signal for which speech content is identified: retrieving information about an expected frequency spectrum of the audio signal; comparing the frequency spectrum of portions of the audio signal for which speech content is identified with the respective expected frequency spectrum; and determining that the audio signal may result from a replay attack if a measure of a difference between the frequency spectrum of the portions of the audio signal for which speech content is identified and the respective expected frequency spectrum exceeds a threshold level.

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