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公开(公告)号：US20230013761A1
公开(公告)日：2023-01-19
申请号：US17947423
申请日：2022-09-19
Inventor： John Paul LESSO
Abstract: This application relates to computing circuitry, and in particular to analogue computing circuitry suitable for neuromorphic computing. An analogue computation unit for processing data is supplied with a first voltage from a voltage regulator which is operable in a sequence of phases to cyclically regulate the first voltage. A controller is configured to control operation of the voltage regulator and/or the analogue computation unit, such that the analogue computation unit processes data during a plurality of compute periods that avoid times at which the voltage regulator undergoes a phase transition which is one of a predefined set of phase transitions between defined phases in said sequence of phases. This avoids performing computation operations during a phase transition of the voltage regulator that could result in a transient or disturbance in the first voltage, which could adversely affect the computing.
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公开(公告)号：US20220383882A1
公开(公告)日：2022-12-01
申请号：US17845703
申请日：2022-06-21
Inventor： John Paul LESSO , Peter John FRITH , John Laurence PENNOCK
IPC: G10L19/008
Abstract: This application relates to methods and apparatus for transfer of multiple digital data streams, especially of digital audio data over a single communications link such as a single wire. The application describes audio interface circuitry comprising a pulse-length-modulation (PLM) modulator. The PLM is responsive to a plurality of data streams (PDM-R, PDM-L), to generate a series of data pulses (PLM) with a single data pulse having a rising and falling edge in each of a plurality of transfer periods defined by a first clock signal (TCLK). The timing of the rising and falling edge of each data pulse is dependent upon a combination of the then current data samples from the plurality of data streams. The duration and position of the data pulse in the transfer window in effect defines a data symbol encoding the data. Circuitry for receiving and extracting the data is also disclosed. An interface receives the stream of data pulses (PLM) and data extraction circuitry samples the data pulse to determine which of the possible data symbols the pulse represents and determines a data value for at least one received data stream.
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公开(公告)号：US20220161295A1
公开(公告)日：2022-05-26
申请号：US17102002
申请日：2020-11-23
Inventor： John Paul LESSO
IPC: B06B1/02
Abstract: Drive circuitry for driving a piezoelectric transducer, the circuitry comprising: an inductor; a first reservoir capacitor; a switch network; and control circuitry configured to control operation of the switch network to selectively couple the inductor to one of a power supply, the first reservoir capacitor and the piezoelectric transducer, wherein the circuitry is operative in a discontinuous mode to transfer charge between the reservoir capacitor and the piezoelectric transducer, and wherein a polarity of the first reservoir capacitor is opposite to a polarity of the power supply.
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公开(公告)号：US20210256971A1
公开(公告)日：2021-08-19
申请号：US17261786
申请日：2019-07-31
Inventor： John Paul LESSO , César ALONSO , Earl Corban VICKERS
IPC: G10L15/20 , G06F21/32 , G10L15/22 , G10L21/0208
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：US20210165866A1
公开(公告)日：2021-06-03
申请号：US17171579
申请日：2021-02-09
Inventor： John Paul LESSO , Thomas LORENZ
IPC: G06F21/32 , G10L17/24 , G10K11/178 , G10L17/00
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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Patent Agency Ranking
公开(公告)号：US20210158797A1
公开(公告)日：2021-05-27
申请号：US17091316
申请日：2020-11-06
Inventor： John Paul LESSO , Toru IDO
Abstract: A method of detecting live speech comprises: receiving a signal containing speech; obtaining a first component of the received signal in a first frequency band, wherein the first frequency band includes audio frequencies; and obtaining a second component of the received signal in a second frequency band higher than the first frequency band. Then, modulation of the first component of the received signal is detected; modulation of the second component of the received signal is detected; and the modulation of the first component of the received signal and the modulation of the second component of the received signal are compared. It may then be determined that the speech may not be live speech, if the modulation of the first component of the received signal differs from the modulation of the second component of the received signal.
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公开(公告)号：US20210134297A1
公开(公告)日：2021-05-06
申请号：US17121153
申请日：2020-12-14
Inventor： John Paul LESSO
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：US20210117530A1
公开(公告)日：2021-04-22
申请号：US17113917
申请日：2020-12-07
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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公开(公告)号：US20210027791A1
公开(公告)日：2021-01-28
申请号：US17060339
申请日：2020-10-01
Inventor： John Paul LESSO
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：US20210006257A1
公开(公告)日：2021-01-07
申请号：US17025014
申请日：2020-09-18
Inventor： John Paul LESSO
Abstract: This application relates to time-encoding modulators (TEMs). A TEM receives an input signal (SIN) and outputs a time-encoded output signal (SOUT). A filter arrangement receives the input signal and also a feedback signal (SFB) from the TEM output, and generates a filtered signal (SFIL) based, at least in part, on the feedback signal. A comparator receives the filtered signal and outputs a time-encoded signal (SPWM) based at least in part on the filtered signal. The time encoding modulator is operable in a first mode with the filter arrangement configured as an active filter and in a second mode with the filter arrangement configured as a passive filter. The filter arrangement may include an op-amp, capacitance and switch network. In the first mode the op-amp is enabled, and coupled with the capacitance to provide the active filter. In the second mode the op-amp is disabled and the capacitance coupled to a signal path for the feedback signal to provide a passive filter.
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