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公开(公告)号：US12267016B2
公开(公告)日：2025-04-01
申请号：US17677097
申请日：2022-02-22
Inventor： John P. Lesso
Abstract: A buck-boost converter for converting an input voltage at an input node into an output voltage at an output node, the converter comprising: first and second inductor nodes for connection of an inductor therebetween; a first converter stage coupled between the input node and the first inductor node; and a second converter stage coupled between the second inductor node and the output node, wherein one or more of the first converter stage and the second converter stage comprises a switching network, comprising: a first switch for selectively connecting a first flying capacitor node to a stage input node; a second switch for selectively connecting the first flying capacitor node to a stage output node; a third switch for selectively connecting a second flying capacitor node to the stage output node; and a fourth switch for selectively connecting the second flying capacitor node to a reference voltage, the first and second flying capacitor nodes for connection of a flying capacitor therebetween.
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公开(公告)号：US12184272B2
公开(公告)日：2024-12-31
申请号：US18308395
申请日：2023-04-27
Inventor： John P. Lesso , Douglas J. W. Macfarlane
IPC: H03K17/687 , H03K19/00 , H03K19/0185
Abstract: A switching transducer driver operable in: a first mode in which first and second output stage switches are controlled to generate a two-level output signal, wherein an impedance of the first output stage switch is substantially the same as an impedance of the second output stage switch; and a second mode in which the first and second output stage switches and a third switch are controlled to generate a three-level output signal, wherein an impedance of the third switch is substantially greater than the impedance of the first output stage switch and the second output stage switch.
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公开(公告)号：US12114137B2
公开(公告)日：2024-10-08
申请号：US18524887
申请日：2023-11-30
Inventor： John P. Lesso
Abstract: An apparatus, comprising: an audio input for receiving an input audio signal; an tuning input for receiving a tuning signal; a filter chain comprising a plurality of filters for filtering the audio signal to produce a filtered input audio signal, the filter chain comprising: a first filter module operating at a first sampling rate; and a second filter module operating at a second sampling rate greater than the first sampling rate, wherein a phase response of the first filter module is dependent on the tuning input and wherein a magnitude response of the first filter module is substantially independent of the tuning input.
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公开(公告)号：US12107494B2
公开(公告)日：2024-10-01
申请号：US17704142
申请日：2022-03-25
Inventor： John P. Lesso
CPC classification number: H02M3/07 , H02M1/0067 , H02M1/0083 , H02M1/0095
Abstract: A DC-DC converter for converting an input voltage at an input node, the converter comprising: first and second inductor nodes for connection of an inductor therebetween; first and second flying capacitor nodes for connection of a flying capacitor therebetween; a first switching network for selectively connecting the first flying capacitor node to each of the input node and the first inductor node; a second switching network for selectively connecting the second flying capacitor node to each of the input node and a reference voltage node; and reservoir circuitry, comprising: first and second reservoir capacitor nodes for connection of a reservoir capacitor therebetween; a third switching network for selectively connecting the first reservoir capacitor node to each of the first and second flying capacitor nodes; a fourth switching network for selectively connecting the second reservoir capacitor node to each of the second flying capacitor node and the reference voltage node.
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公开(公告)号：US11900730B2
公开(公告)日：2024-02-13
申请号：US17066137
申请日：2020-10-08
Inventor： John P. Lesso , Jason P. Rhode
CPC classification number: G06V40/50 , G06F17/18 , G10L15/02 , H04R1/1016 , H04R1/1075 , G10L2015/025 , H04R2460/13
Abstract: A method of biometric identification of a person comprises, during an enrolment phase determining at least one enrolment transfer function for bone conduction of an audio signal through an enrolling user's head. The enrolment transfer function is stored. During a verification phase, at least one verification transfer function for bone conduction of an audio signal through the person's head is determined. It is then determined from the at least one verification transfer function and the at least one enrolment transfer function whether the person is the enrolling user.
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Patent Agency Ranking
公开(公告)号：US11710475B2
公开(公告)日：2023-07-25
申请号：US17839938
申请日：2022-06-14
Inventor： John P. Lesso
Abstract: A method of modelling speech of a user of a headset comprising a microphone, the method comprising: receiving a first sample, from a bone-conduction sensor, representing bone-conducted speech of the user; obtaining a measure of fundamental frequency of the bone-conducted speech in each of a plurality of speech frames of the first sample; obtaining a first distribution of the fundamental frequencies of the bone-conducted speech over the plurality of speech frames; receiving, from the microphone, a second sample; determining a first acoustic condition at the headset based on the second signal; performing a biometric process based on the first distribution of fundamental frequencies and the first acoustic condition.
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公开(公告)号：US11689871B2
公开(公告)日：2023-06-27
申请号：US17396974
申请日：2021-08-09
Inventor： John P. Lesso
IPC: H04R29/00
CPC classification number: H04R29/001 , H04R2400/01 , H04R2460/03
Abstract: The disclosure relates in general to on-ear transition detection, and in particular to on-ear transition detection circuitry comprising: a monitoring unit operable to monitor a speaker current flowing through a speaker and/or a speaker voltage induced across the speaker, and to generate a monitor signal indicative of the speaker current and/or the speaker voltage; and an event detector operable to detect a qualifying disturbance in a sensor signal indicative of a qualifying pressure change incident on the speaker caused by the speaker transitioning from an on-ear state to an off-ear state or vice versa, wherein the sensor signal is, or is derived from, the monitor signal.
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公开(公告)号：US11600280B2
公开(公告)日：2023-03-07
申请号：US17036382
申请日：2020-09-29
Inventor： John P. Lesso
IPC: H03M1/12 , H03M1/08 , G10L19/02 , G10L19/26 , G10L21/0232
Abstract: An analogue-to-digital converter (ADC), comprising: an adaptive whitening filter configured to filter an analogue input signal and output a whitened analogue input signal; a first converter configured to receive said whitened analogue input signal and output a whitened digital signal; a controller configured to adapt the whitening filter based on the received analogue input signal.
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公开(公告)号：US11489505B2
公开(公告)日：2022-11-01
申请号：US16989114
申请日：2020-08-10
Inventor： John P. Lesso , Craig Alexander Anderson
Abstract: A method of equalising an audio signal derived from a microphone, the method comprising: receiving the audio signal; applying an order-statistic filter to the audio signal in the frequency domain to generate a statistically filtered audio signal; equalising the received audio signal based on the statistically filtered audio signal to generate an equalised audio signal.
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公开(公告)号：US11418153B2
公开(公告)日：2022-08-16
申请号：US16897847
申请日：2020-06-10
Inventor： John P. Lesso , Andrew J. Howlett
Abstract: This application relates to amplifier circuitry and, in particular, to class-D amplifier circuits. The application describes amplifier circuitry (400) for receiving an input signal (Sin) and generating first and second driving signals (SoutP, SoutN) for driving a bridge-tied-load. The amplifier circuitry includes first and second class-D output stages (403p, 403n) for generating the first and second driving signals based on the input signal. A controller (406) controllably varies a common-mode component of the first and second driving signals based on an indication of amplitude of the first and second driving signals. The controller varies the common-mode component, at lower signal amplitudes, so the common-mode level of the first and second driving signals is moved away from an operating region that leads to distortion.
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