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公开(公告)号：US20200265834A1
公开(公告)日：2020-08-20
申请号：US16869176
申请日：2020-05-07
Inventor： John Paul LESSO , César ALONSO
IPC: G10L15/20 , G10L21/0208 , G10L15/22 , G06F21/32
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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公开(公告)号：US20200162805A1
公开(公告)日：2020-05-21
申请号：US16684925
申请日：2019-11-15
Inventor： John Paul LESSO
Abstract: There is described a switchable microphone device which may be switched between a digital output mode and an analog output mode. There is further described a system for use of such a device, which allows for the switching between analog and digital computing modes.
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公开(公告)号：US20200160186A1
公开(公告)日：2020-05-21
申请号：US16686732
申请日：2019-11-18
Inventor： John Paul LESSO , John Laurence PENNOCK , Gordon James BATES
Abstract: There is described an inference system for performing inference in a machine learning or neural net system, preferably an analog computing system. The overall power consumption of the inference system is reduced by providing for a dynamic or adjustable memory refresh rate of the inference system, and/or providing a dynamic or adjustable accuracy level of components of the inference system.
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公开(公告)号：US20200075028A1
公开(公告)日：2020-03-05
申请号：US16122033
申请日：2018-09-05
Inventor： John Paul LESSO
Abstract: A method of speaker recognition comprises: receiving an audio signal comprising speech; performing a biometric process on a first part of the audio signal, wherein the first part of the audio signal extends over a first time period; obtaining a speaker recognition score from the biometric process for the first part of the audio signal; performing a biometric process on a plurality of second parts of the audio signal, wherein the second parts of the audio signal are successive sections of the first part of the audio signal, and wherein each second part of the audio signal extends over a second time period and the second time period is shorter than the first time period; obtaining a respective speaker recognition score from the biometric process for each second part of the audio signal; and determining whether there has been a speaker change based on the respective speaker recognition scores for successive second parts of the audio signal.
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公开(公告)号：US20200074055A1
公开(公告)日：2020-03-05
申请号：US16118950
申请日：2018-08-31
Inventor： John Paul LESSO
IPC: G06F21/32
Abstract: A method for authenticating a user of an electronic device is disclosed. The method comprises: responsive to detection of a trigger event indicative of a user interaction with the electronic device, generating an audio probe signal to play through an audio transducer of the electronic device; receiving a first audio signal comprising a response of the user's ear to the audio probe signal; receiving a second audio signal comprising speech of the user; and applying an ear biometric algorithm to the first audio signal and a voice biometric algorithm to the second audio signal to authenticate the user as an authorised user.
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Patent Agency Ranking
公开(公告)号：US20190318745A1
公开(公告)日：2019-10-17
申请号：US16451517
申请日：2019-06-25
Inventor： John Paul LESSO , John Laurence MELANSON
Abstract: This application describes methods and apparatus for speaker recognition. An apparatus according to an embodiment has an analyzer for analyzing each frame of a sequence of frames of audio data which correspond to speech sounds uttered by a user to determine at least one characteristic of the speech sound of that frame. An assessment module determines, for each frame of audio data, a contribution indicator of the extent to which that frame of audio data should be used for speaker recognition processing based on the determined characteristic of the speech sound. Said contribution indicator comprises a weighting to be applied to each frame in the speaker recognition processing. In this way frames which correspond to speech sounds that are of most use for speaker discrimination may be emphasized and/or frames which correspond to speech sounds that are of least use for speaker discrimination may be de-emphasized.
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公开(公告)号：US20190295554A1
公开(公告)日：2019-09-26
申请号：US15927740
申请日：2018-03-21
Inventor： John Paul LESSO
Abstract: The present disclosure provides methods, systems, devices and computer program products for authenticating a user based on a comparison of audio signals to a stored voice model for an authorised user. In one aspect, a method comprises: obtaining a first audio signal that comprises a representation of a bone-conducted signal, wherein the bone-conducted signal is conducted via at least part of the user's skeleton; obtaining a second audio signal that comprises a representation of an air-conducted signal; and, responsive to a determination that the first audio signal comprises a voice signal, enabling updates to the stored voice model for the authorised user based on the second audio signal.
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公开(公告)号：US20190266996A1
公开(公告)日：2019-08-29
申请号：US15907630
申请日：2018-02-28
Inventor： John Paul LESSO
IPC: G10L15/08
Abstract: A method of speaker recognition comprises receiving an audio signal representing speech. A speaker change detection process is performed on the received audio signal. A trigger phrase detection process is also performed on the received audio signal. On detecting the trigger phrase in the received audio signal, a speaker recognition process is performed on the detected trigger phrase and on any speech preceding the detected trigger phrase and following an immediately preceding speaker change.
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公开(公告)号：US20190261085A1
公开(公告)日：2019-08-22
申请号：US16289885
申请日：2019-03-01
Inventor： John Paul LESSO , John Laurence MELANSON
Abstract: This application relates to methods and apparatus for digital microphones. Disclosed is a digital microphone apparatus (300) for outputting a digital output signal (DATA) at a sample rate defined by a received clock signal (CLK). The apparatus includes a band splitter (302) configured to receive a microphone signal (SMD) indicative of an output of a microphone transducer and split said microphone signal into first signal path (SP1) for frequencies in a first band and a second signal path (SP2) for frequencies in a second band, the frequencies of the second band being higher than the frequencies in the first band. A modulation block (304) is configured to operate on the second signal path to down-convert signals in the second signal path from the second frequency band to a lower frequency band.
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公开(公告)号：US20190158971A1
公开(公告)日：2019-05-23
申请号：US16190455
申请日：2018-11-14
Inventor： John Paul LESSO
IPC: H04R29/00 , H03M1/50 , H03K7/08 , H03K3/0233
Abstract: This application relates an activity detector (100) for detecting signal activity in an input audio signal (SIN), such as may be used for always-on speech detection. The activity detector has a first time-encoding modulator (TEM) 101 including a first hysteretic comparator (201) for generating a PWM (pulse-width modulation) signal based on the input audio signal. A second TEM (103) having a second hysteretic comparator (401) is arranged to receive a reference voltage (VMID) and generate a clock signal (SCLK). A time-decoding converter (102) receives the clock signal and generates count values of a number of cycles of the clock signal in periods defined by the PWM signal. An activity monitor (104) is responsive to a count signal (SCT) from the TDC 102 to determine whether the input audio signal comprises signal activity above a defined threshold.
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