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公开(公告)号：US20240048903A1
公开(公告)日：2024-02-08
申请号：US17816489
申请日：2022-08-01
Applicant: Cirrus Logic International Semiconductor Ltd
Inventor： Sandeep P. Sira , Philip B. J. Clarkin , Roberto Napoli
CPC classification number: H04R3/007 , H04R29/001
Abstract: This disclosure provides techniques for determining a reference resistance of a loudspeaker, such as in a mobile device. The reference resistance value may be used, among other applications, for speaker protection by reducing overdrive of the loudspeaker beyond safe temperature, which could damage the loudspeaker, while allowing driving of the loudspeaker closer to safety limits to improve performance of the loudspeaker. In a first aspect, a method of audio device monitoring includes applying a first signal to a loudspeaker; measuring a voltage and a current for the loudspeaker while applying the first signal to the loudspeaker; and determining a reference resistance for the loudspeaker based on the voltage and the current. Other aspects and features are also claimed and described.
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公开(公告)号：US10356522B2
公开(公告)日：2019-07-16
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 , H04R29/00 , H04R3/04 , G10L21/0272
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：US10341767B2
公开(公告)日：2019-07-02
申请号：US15792189
申请日：2017-10-24
Inventor： Jason Lawrence , Roberto Napoli , Rong Hu
Abstract: Speaker protection may be based on multiple speaker models with oversight logic that controls the speaker protection based on the multiple speaker models. At least one of the speaker models may be based on a speaker excursion determined from feedback information from the speaker, such as a current or voltage measured at the speaker. Excursion based on the speaker feedback may be used to determine an error in an excursion prediction made from the audio signal. The excursion prediction may then be compensated for that error. In some embodiments, a direct displacement estimate of excursion generated from speaker monitor signals is used to correct a fixed excursion model applied to an input audio signal.
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公开(公告)号：US11476805B2
公开(公告)日：2022-10-18
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：US20180160227A1
公开(公告)日：2018-06-07
申请号：US15792189
申请日：2017-10-24
Inventor： Jason Lawrence , Roberto Napoli , Rong Hu
CPC classification number: H04R3/007 , H04R3/002 , H04R29/001 , H04R2201/028 , H04R2499/11
Abstract: Speaker protection may be based on multiple speaker models with oversight logic that controls the speaker protection based on the multiple speaker models. At least one of the speaker models may be based on a speaker excursion determined from feedback information from the speaker, such as a current or voltage measured at the speaker. Excursion based on the speaker feedback may be used to determine an error in an excursion prediction made from the audio signal. The excursion prediction may then be compensated for that error. In some embodiments, a direct displacement estimate of excursion generated from speaker monitor signals is used to correct a fixed excursion model applied to an input audio signal.
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Patent Agency Ranking
公开(公告)号：US09942657B2
公开(公告)日：2018-04-10
申请号：US15186992
申请日：2016-06-20
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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公开(公告)号：US09794687B2
公开(公告)日：2017-10-17
申请号：US14867758
申请日：2015-09-28
Inventor： Roberto Napoli , Jason William Lawrence
CPC classification number: H04R3/007 , H03F1/52 , H03G3/001 , H03G3/20 , H03G3/3005 , H03G7/002 , H04R29/003 , H04R2430/01
Abstract: This application relates to methods and apparatus for thermal protection of a loudspeaker (102). A controller (106) is configured to generate a control signal (Gmod) for modulating the gain of a signal processing chain (101) that drives the loudspeaker. The controller is configured such that the control signal is generated as a function of each of: an indication of voice coil temperature of the loudspeaker (TVC); an indication of power dissipation in the voice coil of the loudspeaker (PVC); and an indication of a reservoir temperature (Tres) of a thermal reservoir for heat flow from the voice coil. The reservoir temperature may be an ambient temperature of the environment or a temperature of a component of the loudspeaker or apparatus that acts as a heat sink.
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公开(公告)号：US10778173B2
公开(公告)日：2020-09-15
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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公开(公告)号：US10219074B2
公开(公告)日：2019-02-26
申请号：US15878659
申请日：2018-01-24
Inventor： Roberto Napoli , Stefan Williams
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 the loudspeaker. The gain control signal is generated as a function of all of the estimate of the temperature of the voice coil, the estimate of the rate of change of the temperature of the voice coil, and the estimate of the power dissipation in the voice coil.
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公开(公告)号：US10206038B2
公开(公告)日：2019-02-12
申请号：US15905319
申请日：2018-02-26
Inventor： Jason William Lawrence , Roger David Serwy , Roberto Napoli
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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