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.