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    Ultrasonic attack prevention for speech enabled devices
    1.
    发明授权
    Ultrasonic attack prevention for speech enabled devices 有权

    公开(公告)号：US10565978B2

    公开(公告)日：2020-02-18

    申请号：US16118719

    申请日：2018-08-31

    申请人： INTEL CORPORATION

    发明人： Przemyslaw Maziewski ,  Jan Banas ,  Piotr Klinke ,  Pawel Pach ,  Jedrzej Prysko ,  Roksana Sokolowska-Kostyk ,  Dominik Stanczak ,  Pawel Trella

    IPC分类号： G10K11/178 ,  H04R3/00 ,  G10L21/0208

    摘要： Techniques are provided for defending against an ultrasonic attack on a speech enabled device. A methodology implementing the techniques according to an embodiment includes detecting voice activity in an audio signal received by the device and generating an ultrasonic jamming signal in response to the detection. The jamming signal is broadcast over a loudspeaker for up to the duration of the detected voice activity to defend against the ultrasonic attack. According to another embodiment, the ultrasonic jamming signal is generated in response to detection of a wake-on-voice key phrase in the received audio signal, and the jamming signal is broadcast over the loudspeaker for a time duration selected to be less than or equal to a time window during which spoken commands are accepted by the device following the wake-on-voice key phrase detection. The jamming signal may include white or colored noise, combinations of tones, and/or a periodic sweep frequency.

    ENVIRONMENT CLASSIFIER FOR DETECTION OF LASER-BASED AUDIO INJECTION ATTACKS
    4.
    发明申请
    ENVIRONMENT CLASSIFIER FOR DETECTION OF LASER-BASED AUDIO INJECTION ATTACKS 审中-公开

    公开(公告)号：US20200243067A1

    公开(公告)日：2020-07-30

    申请号：US16849525

    申请日：2020-04-15

    申请人： Intel Corporation

    发明人： Przemyslaw Maziewski ,  Jan Banas ,  Piotr Klinke ,  Damian Koszewski ,  Pawel Pach ,  Dominik Stanczak ,  Pawel Trella

    IPC分类号： G10L15/02 ,  G10L15/04

    摘要： Techniques are provided for detection of laser-based audio injection attacks through classification of the acoustic environment. A methodology implementing the techniques according to an embodiment includes broadcasting a reference signal over a loudspeaker into a local environment, and generating a reference model of the local environment based on analysis of a transformed version of that reference signal received through a microphone of the device. The method further includes generating an estimate model based on analysis of a segment of speech in an audio signal received through the microphone. The estimate model is associated with an environment in which the speech was generated. The method further includes calculating a similarity metric (e.g., mathematical distance) between the reference model and the estimate model, and providing warning of a laser-based audio attack if the similarity metric exceeds a threshold value associated with an attack.

    Open-loop multichannel audio impulse response measurement and capture path evaluation
    5.
    发明授权
    Open-loop multichannel audio impulse response measurement and capture path evaluation 有权

    公开(公告)号：US11832067B2

    公开(公告)日：2023-11-28

    申请号：US16886225

    申请日：2020-05-28

    申请人： Intel Corporation

    发明人： Piotr Klinke ,  Jan Banas ,  Damian Koszewski ,  Przemyslaw Maziewski ,  Pawel Pach ,  Pawel Trella

    IPC分类号： H04R29/00 ,  H04R3/04

    CPC分类号： H04R29/005 ,  H04R3/04 ,  H04R29/001 ,  H04R29/008

    摘要： Techniques are provided for audio capture path evaluation of microphones incorporated into a device under test (DUT). A methodology implementing the techniques according to an embodiment includes estimating impulse responses (IRs) of the DUT microphones based on a comparison of a test audio signal received through the DUT microphones, at a selected measurement angle, to the test audio signal received through a reference microphone. The method also includes calculating group delays for the DUT microphones based on phase responses of the estimated IRs and calculating an average of the group delays. The method further includes calculating a distance, projected onto the measurement angle, between the DUT microphones and a geometric center of the DUT microphones. The distance is calculated as a product of the speed of sound and a difference between the average delay and the group delays for the DUT microphones. The process is repeated for additional measurement angles.

    ULTRASONIC ATTACK PREVENTION FOR SPEECH ENABLED DEVICES
    6.
    发明申请
    ULTRASONIC ATTACK PREVENTION FOR SPEECH ENABLED DEVICES 审中-公开

    公开(公告)号：US20190043471A1

    公开(公告)日：2019-02-07

    申请号：US16118719

    申请日：2018-08-31

    申请人： INTEL CORPORATION

    发明人： Przemyslaw Maziewski ,  Jan Banas ,  Piotr Klinke ,  Pawel Pach ,  Jedrzej Prysko ,  Roksana Sokolowska-Kostyk ,  Dominik Stanczak ,  Pawel Trella

    IPC分类号： G10K11/178 ,  G10L21/0208 ,  H04R3/00

    摘要： Techniques are provided for defending against an ultrasonic attack on a speech enabled device. A methodology implementing the techniques according to an embodiment includes detecting voice activity in an audio signal received by the device and generating an ultrasonic jamming signal in response to the detection. The jamming signal is broadcast over a loudspeaker for up to the duration of the detected voice activity to defend against the ultrasonic attack. According to another embodiment, the ultrasonic jamming signal is generated in response to detection of a wake-on-voice key phrase in the received audio signal, and the jamming signal is broadcast over the loudspeaker for a time duration selected to be less than or equal to a time window during which spoken commands are accepted by the device following the wake-on-voice key phrase detection. The jamming signal may include white or colored noise, combinations of tones, and/or a periodic sweep frequency.

    Ultrasonic attack detection employing deep learning
    9.
    发明授权
    Ultrasonic attack detection employing deep learning 有权

    公开(公告)号：US10957341B2

    公开(公告)日：2021-03-23

    申请号：US16235903

    申请日：2018-12-28

    申请人： Intel Corporation

    发明人： Pawel Trella ,  Kuba Lopatka ,  Jan Banas ,  Piotr Klinke

    IPC分类号： G10L25/84 ,  G10L15/16 ,  G10L15/22 ,  G06F21/55 ,  G06N20/00 ,  G10L25/51 ,  G10L15/08 ,  G10L25/30

    摘要： A mechanism, method, and computer readable medium to enhance speech enabled devices. The method comprising receiving, by an ultrasonic attack detector of a speech enabled device, an audio stream from one or more microphones and a segmentation signal from a keyword detector indicating a location of a detected keyword within the audio stream, preprocessing, by the ultrasonic attack detector, a segmented portion of the audio stream including the detected keyword to obtain a spectrogram, and executing, by the ultrasonic attack detector, a neural network classifier using the spectrogram as input, the neural network classifier to discern real human speech from intermodulation distortion products resulting from ultrasonic attacks on the speech enabled device.