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US 10,853,464 B2Granted
Detection of replay attack
AssigneeCirrus Logic, Inc.
InventorJohn Paul Lesso
Life of this patent
Estimating the term…
Abstract
In order to detect a replay attack in a speaker recognition system, at least one feature is identified in a detected magnetic field. It is then determined whether the at least one identified feature of the detected magnetic field is indicative of playback of speech through a loudspeaker. If so, it is determined that a replay attack may have taken place.
Claims19
A method of detecting a replay attack in a speaker recognition system, the method comprising:
- identifying at least one feature of a detected magnetic field;
- determining whether the at least one identified feature of the detected magnetic field is indicative of playback of speech through a loudspeaker;
- and
- if so, determining that a replay attack may have taken place,
- wherein the step of identifying at least one feature of the detected magnetic field comprises:
- receiving a signal from a magnetometer;
- and
- detecting modulation of the at least one feature from the received signal from the magnetometer;
- and
- wherein the step of determining whether the at least one identified feature of the detected magnetic field is indicative of playback of speech through a loudspeaker comprises:
- determining whether a degree of the modulation of the at least one feature at a syllabic rate is indicative of playback of speech through the loudspeaker.
8 more elements
A system for detecting a replay attack in a speaker recognition system, the system comprising:
- a detector for identifying at least one feature of a detected magnetic field;
- and
- a processor for:
- determining whether the at least one identified feature of the detected magnetic field is indicative of playback of speech through a loudspeaker;
- and, if so, determining that a replay attack may have taken place,
- wherein the detector is configured for:
- receiving a signal from a magnetometer;
- and
- detecting modulation of the at least one feature from the received signal from the magnetometer;
- and
- wherein the step of determining whether the at least one identified feature of the detected magnetic field is indicative of playback of speech through a loudspeaker comprises:
- determining whether a degree of the modulation of the at least one feature at a syllabic rate is indicative of playback of speech through the loudspeaker.
9 more elements
Dependencies are inferred from the claim text.