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公开(公告)号：US20190147887A1
公开(公告)日：2019-05-16
申请号：US16188642
申请日：2018-11-13
Inventor： John Paul LESSO , Gordon Richard MCLEOD
Abstract: A method of audio processing comprises receiving an audio signal. A plurality of framed versions of the received audio signal are formed, each of the framed versions having a respective frame start position. One of the plurality of framed versions of the received audio signal is selected. The selected one of the plurality of framed versions of the received audio signal is used in a subsequent process.
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公开(公告)号：US20190115046A1
公开(公告)日：2019-04-18
申请号：US16155053
申请日：2018-10-09
Inventor： John Paul LESSO
CPC classification number: G10L25/93 , G10L21/02 , G10L25/03 , G10L25/18 , G10L25/21 , G10L25/48 , G10L25/60 , G10L2025/937
Abstract: A method for improving the robustness of a speech processing system having at least one speech processing module comprises: receiving an input sound signal comprising audio and non-audio frequencies; separating the input sound signal into an audio band component and a non-audio band component; and identifying possible interference within the audio band from the non-audio band component. Based on such an identification, the operation of a downstream speech processing module is adjusted.
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公开(公告)号：US20190115033A1
公开(公告)日：2019-04-18
申请号：US16156623
申请日：2018-10-10
Inventor： John Paul LESSO
IPC: G10L17/26
Abstract: Detecting a replay attack on a voice biometrics system comprises: receiving a speech signal from a voice source; generating and transmitting an ultrasound signal through a transducer of the device; detecting a reflection of the transmitted ultrasound signal; detecting Doppler shifts in the reflection of the generated ultrasound signal; and identifying whether the received speech signal is indicative of liveness of a speaker based on the detected Doppler shifts. The method further comprises: obtaining information about a position of the device; and adapting the generating and transmitting of the ultrasound signal based on the information about the position of the device.
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公开(公告)号：US20190115032A1
公开(公告)日：2019-04-18
申请号：US16156263
申请日：2018-10-10
Inventor： John Paul LESSO
Abstract: A method of analysis of an audio signal comprises: receiving an audio signal representing speech; extracting first and second components of the audio signal representing first and second acoustic classes of the speech respectively; analysing the first and second components of the audio signal with models of the first and second acoustic classes of the speech of an enrolled user. Based on the analysing, information is obtained information about at least one of a channel and noise affecting the audio signal.
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公开(公告)号：US20190115030A1
公开(公告)日：2019-04-18
申请号：US16155201
申请日：2018-10-09
Inventor： John Paul LESSO
IPC: G10L17/02 , G10L17/04 , G10L21/0308 , G10L21/0232 , G10L25/06 , H04R3/00 , H04R1/32
Abstract: In order to detect a replay attack on a voice biometrics system, a speech signal is received at at least a first microphone and a second microphone. The speech signal has components at first and second frequencies. The method of detection comprises: obtaining information about a position of a source of the first frequency component of the speech signal, relative to the first and second microphones; obtaining information about a position of a source of the second frequency component of the speech signal, relative to the first and second microphones; comparing the position of the source of the first frequency component and the position of the source of the second frequency component; and determining that the speech signal may result from a replay attack if the position of the source of the first frequency component differs from the position of the source of the second frequency component by more than a threshold amount.
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Patent Agency Ranking
公开(公告)号：US20190028072A1
公开(公告)日：2019-01-24
申请号：US16039685
申请日：2018-07-19
Inventor： John Paul LESSO
Abstract: This application relates to method and apparatus for driving acoustic transducers, such as speakers or haptic transducers. A transducer driver circuit (200) has a hysteretic comparator (201) configured to compare, with hysteresis, an input signal (SIN) received at a first comparator input to a feedback signal (SFB) received at a second comparator input. Based on the comparison the hysteretic comparator (201) generates a pulse-width modulation (PWM) signal (SPWM) at a comparator output (206). An inductor (203) is coupled between the comparator output and an output node (204). In use a resistive component (208), which may comprise the transducer (301) is coupled to output node (204). The inductor (203) and resistive component (208) provide filtering to the PWM signal (SPWM). A feedback path extends between the output node (204) and the second comparator input to provide the feedback signal (SFB).
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公开(公告)号：US20190012445A1
公开(公告)日：2019-01-10
申请号：US16028863
申请日：2018-07-06
Inventor： John Paul LESSO , Thomas LORENZ
IPC: G06F21/32 , G10L17/24 , G10L17/00 , G10K11/178
Abstract: The present invention relates to methods, apparatus and systems for authentication of a user based on ear biometric data, and voice biometric data or other authentication data. The ear biometric data may be combined with voice biometric data or with a security question and response.
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公开(公告)号：US20190005964A1
公开(公告)日：2019-01-03
申请号：US16018795
申请日：2018-06-26
Inventor： John Paul LESSO
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.
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公开(公告)号：US20180288523A1
公开(公告)日：2018-10-04
申请号：US15935428
申请日：2018-03-26
Inventor： John Paul LESSO , Emmanuel Philippe Christian HARDY
Abstract: This application describes a noise reduction apparatus (800) for a microphone device (100) having an acoustic port (110). The apparatus has a spectrum peak detect block (301) for receiving a microphone signal (SMIC) and determining, from the microphone signal, at least one characteristic of a resonance peak (202) associated with the acoustic port of the microphone. The at least one characteristic may comprise a resonance frequency (fH) and/or quality factor (QH). A noise reduction block (801) is configured to process the microphone signal based on the resonance characteristic so as to reduce noise in the processed microphone signal due to said resonance. The noise reduction block may apply a function which is the inverse of the determined resonance characteristic.
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公开(公告)号：US20180286420A1
公开(公告)日：2018-10-04
申请号：US15938809
申请日：2018-03-28
Inventor： John Paul LESSO
IPC: G10L19/16 , G10L19/002
Abstract: One aspect of the disclosure provides a device, comprising: an allocation module, for determining one or more metrics of each of a plurality of data streams; a compression module, for compressing each of the plurality of data streams and generating a plurality of compressed data streams, the compression module applying a compression ratio that varies as a function of the metrics determined by the allocation module; and a buffer memory, for storing the plurality of compressed data streams.
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