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公开(公告)号：US20240269706A1
公开(公告)日：2024-08-15
申请号：US18644538
申请日：2024-04-24
Inventor： John Paul LESSO , Toru IDO
IPC: B06B1/02
CPC classification number: B06B1/0261 , B06B2201/55
Abstract: The present disclosure relates to driver circuitry for driving a piezoelectric transducer. The circuitry comprises: a power supply; a reservoir capacitance; switch network circuitry; and control circuitry. The control circuitry is configured to control operation of the switch network circuitry so as to charge the reservoir capacitance from the power supply and to transfer charge between the reservoir capacitance and the piezoelectric transducer.
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公开(公告)号：US20240264112A1
公开(公告)日：2024-08-08
申请号：US18685979
申请日：2022-08-25
Inventor： John Paul LESSO , Toru IDO
IPC: G01N27/327 , G01R19/165
CPC classification number: G01N27/3273 , G01R19/165 , G01R19/16566
Abstract: Circuitry for and methods of analyte measurement Circuitry for measuring a characteristic of an electrochemical cell, the circuitry comprising: a hysteretic comparator having a first comparator input, a second comparator input and a comparator output; a feedback path between the comparator output and the second comparator input configured to provide a feedback signal to the second comparator input; and a loop filter configured to apply filtering to the feedback path to generate the feedback signal, wherein the loop filter comprises the electrochemical cell.
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公开(公告)号：US20230129489A1
公开(公告)日：2023-04-27
申请号：US18089020
申请日：2022-12-27
Inventor： John Paul LESSO
Abstract: The present disclosure relates to a neuron for an artificial neural network. The neuron comprises a dot product engine operative to: receive a set of weights; receive a set of data inputs based on a set of input data signals; and calculate the dot product of the set of data inputs and the set of weights to generate a dot product engine output. The neuron further comprises an activation function module arranged to apply an activation function to a signal indicative of the dot product engine output to generate a neuron output; and gain control circuitry. The gain control circuitry is operative to control: an input gain applied to the input data signals to generate the set of data inputs; and an output gain applied to the dot product engine output or by the activation function module. The output gain is selected to compensate for the applied input gain.
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公开(公告)号：US20220101841A1
公开(公告)日：2022-03-31
申请号：US17549528
申请日：2021-12-13
Inventor： John Paul LESSO , Robert James HATFIELD
Abstract: A speech recognition system comprises: an input, for receiving an input signal from at least one microphone; a first buffer, for storing the input signal; a noise reduction block, for receiving the input signal and generating a noise reduced input signal; a speech recognition engine, for receiving either the input signal output from the first buffer or the noise reduced input signal from the noise reduction block; and a selection circuit for directing either the input signal output from the first buffer or the noise reduced input signal from the noise reduction block to the speech recognition engine.
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公开(公告)号：US20220093108A1
公开(公告)日：2022-03-24
申请号：US17540600
申请日：2021-12-02
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：US20220084541A1
公开(公告)日：2022-03-17
申请号：US17507886
申请日：2021-10-22
Inventor： Thomas Ivan HARVEY , John Paul LESSO , William Erik SHERWOOD , Fredrick D. GEIGER
Abstract: A method for use in a biometric process, comprising: with a headset in a known acoustic environment, applying an acoustic stimulus at a first transducer of the headset; receiving a response signal at a second transducer of the headset, the response signal comprising a component of the acoustic stimulus reflected at an obstacle in the acoustic path of the first transducer; determining a condition of the headset based on the response signal; and performing the biometric process based on the determined condition.
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公开(公告)号：US20210351755A1
公开(公告)日：2021-11-11
申请号：US17386287
申请日：2021-07-27
Inventor： John Paul LESSO , Toru IDO
Abstract: This application relates to Class D amplifier circuits. A modulator controls a Class D output stage based on a modulator input signal (Dm) to generate an output signal (Vout) which is representative of an input signal (Din). An error block, which may comprise an ADC, generates an error signal (ε) from the output signal and the input signal. In various embodiments the extent to which the error signal (ε) contributes to the modulator input signal (Dm) is variable based on an indication of the amplitude of the input signal (Din). The error signal may be received at a first input of a signal selector block. The input signal may be received at a second input of the signal selector block. The signal selector block may be operable in first and second modes of operation, wherein in the first mode the modulator input signal is based at least in part on the error signal; and in the second mode the modulator input signal is based on the digital input signal and is independent of the error signal. The error signal can be used to reduce distortion at high signal levels but is not used at low signal levels and so the noise floor at low signal levels does not depend on the component of the error block.
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公开(公告)号：US20210303669A1
公开(公告)日：2021-09-30
申请号：US17223897
申请日：2021-04-06
Inventor： John Paul LESSO
IPC: G06F21/32 , G10K11/178 , G06F17/18
Abstract: Embodiments of the disclosure relate to methods, apparatus and systems for biometric processes. The invention relates to initiating generation of an acoustic stimulus for application to a user's ear and extracting features for use in a biometric process from a measured response signal. The measured response signal may be used to derive one or more quality metrics and the quality metrics may be used to validate features extracted from the measured response. The quality metrics may be used to provide feedback to the user seeking to carry out the biometric process.
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公开(公告)号：US20210157890A1
公开(公告)日：2021-05-27
申请号：US17167913
申请日：2021-02-04
Inventor： John Paul LESSO
Abstract: Embodiments of the disclosure provide a mechanism for performing a biometric algorithm on ear biometric data acquired from a user. The mechanism may be used for biometric authentication, or in-ear detect, for example. In one embodiment, a method is provided in which a quality metric of an input signal to a transducer and/or a signal on a return path from the transducer is monitored. One or more steps of a biometric process, comprising monitoring of a parameter related to an admittance of the transducer, comparison of the parameter to a stored profile for an authorised user, generation of a score based on the comparison, comparison of the score to one or more threshold values, and initiation of one or more actions, may be performed responsive to the quality metric meeting one or more criteria.
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公开(公告)号：US20210105569A1
公开(公告)日：2021-04-08
申请号：US17123801
申请日：2020-12-16
Inventor： John Paul LESSO
IPC: H04R29/00 , H03M1/50 , G04F10/00 , H03K3/0233 , H03K7/08
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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