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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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公开(公告)号：US20170094408A1
公开(公告)日：2017-03-30
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：US10582300B2
公开(公告)日：2020-03-03
申请号：US16006139
申请日：2018-06-12
Inventor： Ylva Ellen Maria Bjork , Erik Vilhelm Lindahl , Jason William Lawrence , Christopher Ekbom
Abstract: Methods and Apparatus for estimating a temperature of an electromechanical transducer. The method comprising receiving an audio signal (901); providing an output signal to the electromechanical transducer, based on the audio signal (902); and determining whether a first magnitude of the audio signal in a first frequency band is above a magnitude threshold (903). In response to the first magnitude being above or equal to the magnitude threshold, calculating a first impedance of the electromechanical transducer based on measurements of a first voltage and a first current of the electromechanical transducer within the first frequency band (905), and estimating the temperature of the electromechanical transducer based on the first impedance (907). In response to the first magnitude being below the magnitude threshold, inserting a pilot tone into the audio signal (909), wherein the pilot tone is at a pilot tone frequency, calculating a second impedance of the electromechanical transducer based on measurements of a second voltage and a second current of the electromechanical transducer at the pilot tone frequency (911), and estimating the temperature of the electromechanical transducer based on the second impedance (913).
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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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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：US10728660B2
公开(公告)日：2020-07-28
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：US10567895B2
公开(公告)日：2020-02-18
申请号：US16154984
申请日：2018-10-09
Inventor： Jason William Lawrence , Antonio Jesus Diez Elorza
Abstract: Embodiments described herein provide a method in a thermal model based estimator and a thermal model based estimator for estimating a temperature of a transducer. The method comprises receiving a first signal wherein the first signal is representative of an impedance across the transducer; receiving an indication of a current across the transducer; determining an estimated thermal power based on the indication of the current and an estimated temperature signal, determining, based on the estimated thermal power, the estimated temperature signal using a thermal model of the transducer comprising states defined by a thermal state vector; comparing the first signal with a second signal derived from the estimated temperature signal; updating the thermal state vector of the thermal model based on the comparison; and; outputting the estimated temperature signal.
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公开(公告)号：US10356521B2
公开(公告)日：2019-07-16
申请号：US15547836
申请日：2016-02-01
Inventor： Jason William Lawrence , Roberto Napoli , Roger David Serwy , Jie Su , Stefan Williams , Rong Hu , Firas Azrai
IPC: H04R3/00 , H04R29/00 , G10L21/0272 , H04R3/04
Abstract: This application describes methods and apparatus for loudspeaker protection. A loudspeaker protection system (1100) 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 . . . ωη). A first gain block (103) is configured to apply a respective frequency band gain (gt1, gt2 . . . ,gt3) to each of the audio signals in the different respective frequency bands and a gain controller (109; 1101) is provided for controlling the respective band gains. A thermal controller (1101) determines, for each of a plurality of the different respective frequency bands, a power dissipation for the loudspeaker in that frequency band and also determines a respective thermal gain setting based on the determined power dissipation for that frequency band. The gain controller is configured to control the respective frequency band gains based on the thermal gain settings.
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