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    Detection of replay attack
    2.
    发明授权
    Detection of replay attack 有权

    公开(公告)号：US11631402B2

    公开(公告)日：2023-04-18

    申请号：US16869176

    申请日：2020-05-07

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： John Paul Lesso ,  César Alonso

    IPC: G10L17/00 ,  G10L15/20 ,  G06F21/32 ,  G10L15/22 ,  G10L21/0208 ,  G10L15/06

    Abstract: 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.

    Detection of replay attack
    3.
    发明授权
    Detection of replay attack 有权

    公开(公告)号：US10692490B2

    公开(公告)日：2020-06-23

    申请号：US16050593

    申请日：2018-07-31

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： John Paul Lesso ,  César Alonso

    IPC: G10L17/00 ,  G10L15/20 ,  G06F21/32 ,  G10L15/22 ,  G10L21/0208 ,  G10L15/06

    Abstract: 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.

    Detection of replay attack
    4.
    发明授权
    Detection of replay attack 有权

    公开(公告)号：US12288553B2

    公开(公告)日：2025-04-29

    申请号：US17261786

    申请日：2019-07-31

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： John Paul Lesso ,  César Alonso ,  Earl Corban Vickers

    IPC: G10L15/20 ,  G06F21/32 ,  G10L15/22 ,  G10L21/0208 ,  G10L15/06

    Abstract: 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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