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公开(公告)号：US11704397B2
公开(公告)日：2023-07-18
申请号：US17074743
申请日：2020-10-20
Inventor： John Paul Lesso
IPC: G06F21/32 , H04L9/32 , G10L25/03 , G10L17/02 , H04K1/00 , H04L9/40 , G06F21/55 , H04W12/122 , G01R33/00 , G10L15/24 , G10L17/26 , H04R3/00
CPC classification number: G06F21/32 , G01R33/0094 , G06F21/554 , G10L15/24 , G10L17/02 , G10L17/26 , G10L25/03 , H04K1/00 , H04L9/3231 , H04L63/0861 , H04L63/1466 , H04L63/1483 , H04W12/122 , H04R3/00 , H04R3/005 , H04R2499/13
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：US11694695B2
公开(公告)日：2023-07-04
申请号：US17540600
申请日：2021-12-02
Inventor： John Paul Lesso
CPC classification number: G10L17/10 , G10L15/08 , G10L17/02 , G10L17/06 , G10L17/18 , G10L17/22 , G10L2015/088
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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公开(公告)号：US11651168B2
公开(公告)日：2023-05-16
申请号：US17947423
申请日：2022-09-19
Inventor： John Paul Lesso
CPC classification number: G06G7/48 , G06N3/065 , H02M1/0845 , H03M1/06 , H03M1/12
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：US11558706B2
公开(公告)日：2023-01-17
申请号：US17123801
申请日：2020-12-16
Inventor： John Paul Lesso
IPC: H04R29/00 , G04F10/00 , H03K3/0233 , H03K7/08 , H03M1/50
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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公开(公告)号：US11531738B2
公开(公告)日：2022-12-20
申请号：US16834047
申请日：2020-03-30
Inventor： Thomas Ivan Harvey , John Paul Lesso
Abstract: A method for use in a biometric process, comprising: for a first function and a second function, applying an acoustic stimulus to a user's ear; and for the second function: receiving a response signal of a user's ear to the acoustic stimulus; and extracting, from the response signal, one or more features for use in a biometric process, wherein the first function is a function other than to induce the response signal for use in the biometric process.
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Patent Agency Ranking
公开(公告)号：US11437022B2
公开(公告)日：2022-09-06
申请号：US16901092
申请日：2020-06-15
Inventor： John Paul Lesso
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：US11387793B2
公开(公告)日：2022-07-12
申请号：US17061803
申请日：2020-10-02
Inventor： John Paul Lesso
Abstract: This application relates to amplifier circuitry, in particular class-D amplifiers, operable in open-loop and closed-loop modes. An amplifier (300) has a forward signal path for receiving an input signal (SIN) and outputting an output signal (SOUT) and a feedback path operable to provide a feedback signal (SFB) from the output. A feedforward path provide a feedforward signal (SFF) from the input and a combiner (105) is operable to determine an error signal (ε) based on a difference between the feedback signal and the feedforward signal. The feedforward comprises a compensation module (201) configured to apply a controlled transfer function to the feedforward signal in the closed-loop mode of operation, such that an overall transfer function for the amplifier is substantially the same in the closed-loop mode of operation and the open-loop mode of operation.
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公开(公告)号：US11276409B2
公开(公告)日：2022-03-15
申请号：US16184644
申请日：2018-11-08
Inventor： John Paul Lesso
Abstract: In order to detect a replay attack on a voice biometrics system, a first signal from received sound is generated at a first microphone, and a second signal from the received sound is generated at a second microphone. The first and second signals are used to determine a location of an apparent source of the received sound. It is determined that the received sound may result from a replay attack if the apparent source of the received sound is diffuse.
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公开(公告)号：US11265648B2
公开(公告)日：2022-03-01
申请号：US17021156
申请日：2020-09-15
Inventor： John Paul Lesso
Abstract: Audio circuitry, comprising: a speaker driver operable to drive a speaker based on a speaker signal; a current monitoring unit operable to monitor a speaker current flowing through the speaker and generate a monitor signal indicative of that current; and a microphone signal generator operable, when external sound is incident on the speaker, to generate a microphone signal representative of the external sound based on the monitor signal and the speaker signal.
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公开(公告)号：US11223360B2
公开(公告)日：2022-01-11
申请号：US16934304
申请日：2020-07-21
Inventor： John Laurence Pennock , John Paul Lesso
IPC: H03K19/0948 , H03K17/16 , H03K19/003 , H03M1/00
Abstract: This application relates to control of semiconductor devices, in particular MOS devices, so as to reduce RTS/flicker noise. A circuit (100) includes a first MOS device (103, 104) and a bias controller (107). The circuit is operable in at least a first circuit state (PRO) in which the first MOS device is active to contribute to a first signal (Sout) and a second circuit state (PRST) in which the first MOS device does not contribute to the first signal. The bias controller is operable to control voltages at one or more terminals of the first MOS device to apply a pre-bias (VRB1, VPB2) during an instance of the second circuit state. The pre-bias is applied to set an occupancy state of charge carriers traps within the first MOS device, to limit noise during subsequent operation in the first circuit state. In embodiments, the bias controller is configured so that at least one parameter of the pre-bias is selectively variable in use based on one or more operating conditions.
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