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公开(公告)号：US20200082831A1
公开(公告)日：2020-03-12
申请号：US16685264
申请日：2019-11-15
Inventor： John Paul LESSO , Gordon Richard MCLEOD
Abstract: A method of speaker verification comprises: comparing a test input against a model of a user's speech obtained during a process of enrolling the user; obtaining a first score from comparing the test input against the model of the user's speech; comparing the test input against a first plurality of models of speech obtained from a first plurality of other speakers respectively; obtaining a plurality of cohort scores from comparing the test input against the plurality of models of speech obtained from a plurality of other speakers; obtaining statistics describing the plurality of cohort scores; modifying said statistics to obtain adjusted statistics; normalising the first score using the adjusted statistics to obtain a normalised score; and using the normalised score for speaker verification
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公开(公告)号：US20200082830A1
公开(公告)日：2020-03-12
申请号：US16556582
申请日：2019-08-30
Inventor： John Paul LESSO
Abstract: A biometric is formed for at least one enrolled speaker by: obtaining a sample of speech of the enrolled speaker; obtaining a measure of a fundamental frequency of the speech of the enrolled speaker in each of a plurality of speech frames; and forming a first distribution function of the fundamental frequency of the speech of the enrolled speaker. Subsequently, for a speaker to be recognised, a sample of speech of the speaker to be recognised is obtained. Then, a measure of a fundamental frequency of the speech of the speaker to be recognised is obtained in each of a plurality of speech frames. A second distribution function of the fundamental frequency of the speech of the speaker to be recognised is formed, the second distribution function and the first distribution function are compared, and it is determined whether the speaker to be recognised is the enrolled speaker based on a result of comparing the second distribution function and the first distribution function.
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公开(公告)号：US20200076621A1
公开(公告)日：2020-03-05
申请号：US16607539
申请日：2018-04-27
Inventor： John Paul LESSO
Abstract: This application relates to the transfer of audio data, and in particular to the verification that data transmitted to a data processing module, such as voice biometric module (111), did originate from a microphone. A microphone authentication apparatus (204) is described having a first input for receiving analogue audio signals from a microphone transducer (201) and an analogue-to-digital converter (202) coupled to said first input for generating digital microphone data based on the received audio signals. A data authentication module (203) generates an authentication certificate (MAC) for certifying that the digital microphone data did pass via the authentication module. The authentication certificate is based on the digital microphone data (DM) and an authentication module key. An output module outputs a digital microphone audio signal based on the digital microphone data with the authentication certificate.
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公开(公告)号：US20200075021A1
公开(公告)日：2020-03-05
申请号：US16115654
申请日：2018-08-29
Inventor： John Paul LESSO
IPC: G10L17/00
Abstract: A method of performing speech recognition, comprises, at a first device: receiving an audio signal representing speech; performing a first data integrity check operation on the received audio signal; performing a speaker recognition process on the received audio signal; forwarding the received audio signal to a second device, wherein the second device comprises a speech recognition function; and forwarding an output of the first data integrity check operation to the second device. The method further comprises, at the second device: receiving the audio signal forwarded from the first device; receiving the output of the first data integrity check operation forwarded from the first device; performing a second data integrity check operation on the audio signal forwarded from the first device; and using a result of performing the speech recognition function on the audio signal forwarded from the first device only if an output of the second data integrity check operation matches the output of the first data integrity check operation forwarded from the first device.
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公开(公告)号：US20190333522A1
公开(公告)日：2019-10-31
申请号：US16506157
申请日：2019-07-09
Inventor： John Paul LESSO
Abstract: A method of speaker identification comprises receiving an audio signal representing speech; performing a first voice biometric process on the audio signal to attempt to identify whether the speech is the speech of an enrolled speaker; and, if the first voice biometric process makes an initial determination that the speech is the speech of an enrolled user, performing a second voice biometric process on the audio signal to attempt to identify whether the speech is the speech of the enrolled speaker. The second voice biometric process is selected to be more discriminative than the first voice biometric process.
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Patent Agency Ranking
公开(公告)号：US20190199359A1
公开(公告)日：2019-06-27
申请号：US16225821
申请日：2018-12-19
Inventor： John Paul LESSO
Abstract: This application relates to sensing circuits for sensing a physical property or quantity of interest. The sensing circuit has an oscillator comprising a hysteretic comparator and a loop filter configured to output an oscillation signal. The loop filter comprises a first component with an electrical property that varies with the physical property or quantity of interest. A time constant of the loop filter depends on the electrical property of the first component. A decoder is configured to receive the oscillation signal and provide an indication of any change in frequency of the oscillation signal as an indication of a change in the physical property or quantity of interest. The electrical property may be an impedance, such as a resistance.
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公开(公告)号：US20190114497A1
公开(公告)日：2019-04-18
申请号：US16157843
申请日：2018-10-11
Inventor： John Paul LESSO
Abstract: Detecting liveness of a speaker comprises: generating an ultrasound signal; receiving an audio signal comprising a reflection of the ultrasound signal; using the received audio signal comprising the reflection of the ultrasound signal to detect the liveness of a speaker; monitoring ambient ultrasound noise; and adjusting the operation of a system receiving the audio signal, based on a level of the reflected ultrasound and the monitored ambient ultrasound noise. The method can be used in a voice biometrics system, in which case detecting the liveness of a speaker comprises determining whether a received speech signal may be a product of a replay attack. The operation of the voice biometrics system may be adjusted based on a level of the reflected ultrasound and the monitored ambient ultrasound noise.
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公开(公告)号：US20190005963A1
公开(公告)日：2019-01-03
申请号：US16020406
申请日：2018-06-27
Inventor： César ALONSO , John Paul LESSO
Abstract: A method of detecting a replay attack on a voice biometrics system comprises: receiving an audio signal representing speech; detecting a magnetic field; determining if there is a correlation between the audio signal and the magnetic field; and if there is a correlation between the audio signal and the magnetic field, determining that the audio signal may result from a replay attack.
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公开(公告)号：US20180367929A1
公开(公告)日：2018-12-20
申请号：US16009638
申请日：2018-06-15
Inventor： John Paul LESSO , Yanto SURYONO
CPC classification number: H04R29/001 , G01R31/2825 , G10L19/04 , G10L19/12 , H04R3/04 , H04R29/00 , H04R2430/03
Abstract: An audio system receives an input signal and, if the input signal has a sparse representation in the frequency domain, comprising components at at least one frequency of interest, the input signal is filtered in at least one band pass filter, such that only components at the or each frequency of interest are passed to an output. The operation is able in some case to analyse the input signal to determine whether the input signal has a sparse representation in the frequency domain.
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公开(公告)号：US20180351516A1
公开(公告)日：2018-12-06
申请号：US15993990
申请日：2018-05-31
Inventor： John Paul LESSO
Abstract: This application relates to audio driving circuits having good audio performance. The circuit (301) has a forward signal path between an input (103) for receiving an input audio signal (SIN) and an output (104) for outputting an output signal (SOUT) with an amplifier module (102) in the forward signal path. An error block (302) is arranged to receive a first signal (SFF) derived from the input signal and also a second signal (SFB) derived from the output signal and determine a first error signal (ε1) indicative of a difference between the first and second signals. A first processing module (204) is operable to generate a compensation signal (SC) to be applied to the input signal (SIN) upstream of the amplifier module (102) based on the first error signal. The error block (302) comprises a second processing module (303/303a) configured to apply a linear transfer function to one of the first signal or the second signals prior to determining the first error signal. In some embodiments the second processing module may apply a linear transfer function which is adaptive based on a second error signal (ε2) indicative of the error between the first and second signals after the linear transfer function has been applied.
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