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公开(公告)号：US20210175852A1
公开(公告)日：2021-06-10
申请号：US16850248
申请日：2020-04-16
Inventor： Philip CLARKIN , Ivan PERRY , Mark H. TOVELL , Roberto NAPOLI , David RHODES
Abstract: The present disclosure relates to circuitry comprising: amplifier circuitry configured to receive a variable supply voltage, wherein the supply voltage varies according to an output signal of the amplifier circuitry; monitoring circuitry configured to monitor one or more parameters of an output signal of the amplifier circuitry; and processing circuitry configured to receive an indication of the voltage of the variable supply voltage and an indication of the monitored parameters from the monitoring circuitry and to apply a correction to one or more of the monitored parameters to compensate for coupling between the variable supply voltage and the monitoring circuitry.
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公开(公告)号：US20190124444A1
公开(公告)日：2019-04-25
申请号：US16226178
申请日：2018-12-19
Inventor： Jason William LAWRENCE , Roger David SERWY , Roberto NAPOLI
Abstract: This application relates to methods and apparatus for loudspeaker protection. A loudspeaker protection system receives a digital audio signal comprising a plurality of samples at an input node. A delay block delays the digital audio signal and a gain block applies a controlled gain to the delayed digital audio signal. An excursion predictor is configured to receive a version of the audio signal from the signal path upstream of the delay block and determine a predicted excursion for a loudspeaker based on the audio signal. A gain controller controls a gain setting of the gain block in response to the predicted excursion and a first loudspeaker impulse response model and a predetermined excursion limit. The gain controller is configured to determine at least one gain setting {ga gi} to be applied to a set of samples {Va . . . Vi} of the audio signal delayed by the delay block where the set of samples of the audio signal corresponds to a time-span which is less than an impulse response settling time of the loudspeaker.
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公开(公告)号：US20220407461A1
公开(公告)日：2022-12-22
申请号：US17894799
申请日：2022-08-24
Inventor： Philip CLARKIN , Ivan PERRY , Mark H. TOVELL , Roberto NAPOLI , David RHODES
Abstract: The present disclosure relates to circuitry comprising: amplifier circuitry configured to receive a variable supply voltage, wherein the supply voltage varies according to an output signal of the amplifier circuitry; monitoring circuitry configured to monitor one or more parameters of an output signal of the amplifier circuitry; and processing circuitry configured to receive an indication of the voltage of the variable supply voltage and an indication of the monitored parameters from the monitoring circuitry and to apply a correction to one or more of the monitored parameters to compensate for coupling between the variable supply voltage and the monitoring circuitry.
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公开(公告)号：US20190116419A1
公开(公告)日：2019-04-18
申请号：US16161410
申请日：2018-10-16
Inventor： Roberto NAPOLI , Jason William LAWRENCE
IPC: H04R3/00
Abstract: Embodiments described herein provide methods and apparatus for predicting the excursion of a transducer. The method comprises determining whether an input signal to the transducer is a periodic signal; and responsive to determining that the input signal is a periodic signal, calculating the predicted excursion based on a direct current (“DC”) offset associated with the transducer.
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公开(公告)号：US20200036356A1
公开(公告)日：2020-01-30
申请号：US16169723
申请日：2018-10-24
Inventor： Hezi ZHU , Roberto NAPOLI , Jie SU , Waleed ESHMAWY
Abstract: A method for compensating for a change in back electric motive force in a transducer in a device, wherein the transducer is driven by an output signal output by an amplifier, and a back volume of the transducer is formed by an enclosure within the device. The method comprises: receiving an input signal; determining, based on a characteristic of the transducer that the transducer has moved from an equilibrium position within the device; and based on the determination, adjusting a gain applied to the input signal by the amplifier to generate the output signal.
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Patent Agency Ranking
公开(公告)号：US20180213322A1
公开(公告)日：2018-07-26
申请号：US15878659
申请日：2018-01-24
Inventor： Roberto NAPOLI , Stefan WILLIAMS
CPC classification number: H04R3/007 , G10L25/21 , H03G3/3005 , H04R29/001 , H04R29/003 , H04R2499/11
Abstract: A method of thermal protection of a voice coil of a loudspeaker comprises: determining an estimate of a temperature of the voice coil, determining an estimate of a rate of change of the temperature of the voice coil, determining an estimate of power dissipation in the voice coil, and generating a gain control signal for modulating a gain applied to an input signal in a signal path between an input terminal and said loudspeaker. The gain control signal is generated as a function of all of said estimate of the temperature of the voice coil, said estimate of the rate of change of the temperature of the voice coil, and said estimate of the power dissipation in the voice coil.
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公开(公告)号：US20180014121A1
公开(公告)日：2018-01-11
申请号：US15547850
申请日：2016-02-01
Inventor： Jason William LAWRENCE , Roberto NAPOLI , Roger SERWY , Jie SU , Stefan WILLIAMS , Rong HU , Firas AZRAI
IPC: H04R3/00 , G10L21/0272 , H04R3/04 , H04R29/00
CPC classification number: H04R3/007 , G10L21/0272 , H04R3/04 , H04R29/001 , H04R2430/01
Abstract: This application describes methods and apparatus for loudspeaker protection. A loudspeaker protection system (100) is described having a first frequency band-splitter (102) for splitting an input audio signal (Vin) into a plurality of audio signals (v1, v2 . . . , vn) in different respective frequency bands (ω1, ω2 . . . , ωn). A first gain block (103) is configured to apply a respective frequency band gain (g1, g2 . . . , g3) to each of the audio signals in the different respective frequency bands and a gain controller (107, 108, 109) is provided for controlling the respective band gains. A displacement modeller (104, 105) determines a plurality of displacement signals (x1, x2 . . . , xn) based on the input audio signal (Vin) and a displacement model (104a) where each displacement signal corresponds to a modelled cone displacement for the loudspeaker for one of said different respective frequency bands. The gain controller (107, 108, 109) is configured to control the respective frequency band gains based on the plurality of displacement signals.
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公开(公告)号：US20250071493A1
公开(公告)日：2025-02-27
申请号：US18442902
申请日：2024-02-15
Inventor： Roberto NAPOLI , Philip B.J. CLARKIN , Zhengyi XU , Chris RATTRAY , Edward CRANEY
IPC: H04R29/00
Abstract: An audio system may include a plurality of transducers, a temperature estimator, and a thermal control subsystem. The temperature estimator may be configured to monitor physical quantities associated with a plurality of transducers and based on the physical quantities, determine an estimated temperature associated with a first transducer of the plurality of transducers. The thermal control subsystem may be configured to generate an output signal based on an input signal, the output signal for driving the plurality of transducers and control the output signal based on the estimated temperature.
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公开(公告)号：US20240323601A1
公开(公告)日：2024-09-26
申请号：US18188085
申请日：2023-03-22
Inventor： Ross C. MORGAN , Roberto NAPOLI , Kemal S. DEMIRCI , Thomas H. HOFF
CPC classification number: H04R3/007 , H04R29/001 , H04R2430/01
Abstract: This application relates to methods and apparatus for clipping prevention. A driver apparatus for driving a transducer has a switching driver configured to switch at least one output node between different switching voltages with a controlled duty-cycle to drive an output signal across the transducer. A clipping prevention controller is configured to control a gain applied to the input signal so as to provide limiting of the input signal to avoid clipping of the output signal. The clipping prevention controller is configured to dynamically control at least one limiting threshold used to determine when to apply limiting of the input signal based on an indication of load resistance of the transducer and the input voltage to the switching driver.
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公开(公告)号：US20180184201A1
公开(公告)日：2018-06-28
申请号：US15905319
申请日：2018-02-26
Inventor： Jason William LAWRENCE , Roger David SERWY , Roberto NAPOLI
CPC classification number: H04R3/007 , H04R3/04 , H04R29/003
Abstract: This application relates to methods and apparatus for loudspeaker protection. A loudspeaker protection system (100) receives a digital audio signal comprising a plurality of samples at an input node (IN). A delay block (15) delays the digital audio signal and a gain block (14) applies a controlled gain to the delayed digital audio signal. An excursion predictor (12) is configured to receive a version of the audio signal from the signal path upstream of the delay block and determine a predicted excursion for a loudspeaker based on the audio signal. A gain controller (23) controls a gain setting (g) of the gain block in response to the predicted excursion and a first loudspeaker impulse response model and a predetermined excursion limit. The gain controller (23) is configured to determine at least one gain setting {ga gi} to be applied to a set of samples {Va . . . Vi} of the audio signal delayed by the delay block where the set of samples of the audio signal corresponds to a time-span which is less than an impulse response settling time of the loudspeaker.
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