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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：US20170359652A1
公开(公告)日：2017-12-14
申请号：US15463377
申请日：2017-03-20
Inventor： Roger SERWY , Jason W. LAWRENCE , Firas AZRAI
CPC classification number: H04R3/007 , H03F3/183 , H03F3/21 , H03F2200/03 , H03F2200/102 , H03G3/007 , H03G3/301 , H04R3/04 , H04R29/001
Abstract: A predictive brownout prevention system may be configured to prevent brownout of an audio output signal. Particularly, the brownout prevention system may be configured to receive information indicative of an amplitude of the audio input signal, receive information indicative of a condition of the power supply, receive information indicative of one or more of the following: 1) adaptive estimates of power supply conditions; 2) anticipated effects of power supply capacitance; and 3) condition of a load impedance, determine from the received information whether a brownout condition exists, and responsive to determining the brownout condition exists, generate the selectable attenuation signal to reduce an amplitude of the audio output signal such that the signal path attenuates the audio input signal or a derivative thereof in order to prevent brownout prior to propagation to the audio output of a portion of the audio input signal having the brownout condition.
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公开(公告)号：US20180206034A1
公开(公告)日：2018-07-19
申请号：US15918705
申请日：2018-03-12
Inventor： Roger SERWY , Jason W. LAWRENCE , Firas AZRAI , Jeffrey Allen MAY , Jie SU
CPC classification number: H04R3/007 , H03F1/52 , H03F3/183 , H03F3/21 , H03F2200/03 , H03F2200/211 , H04R1/1041 , H04R3/00 , H04R29/001 , H04R2430/01 , H04R2460/03
Abstract: A predictive brownout prevention system may be configured to prevent brownout of an audio output signal. Particularly, the brownout prevention system may be configured to receive information indicative of adaptive estimates of power supply conditions, wherein the information indicative of adaptive estimates of the power supply conditions comprises information regarding a voltage component and a resistive component received from an adaptive battery model of a battery for providing electrical energy to a power supply for generating the power supply voltage and adapt the adaptive battery model based on a monitored battery voltage output by the battery and loading events of the signal path and excluding loading events of components other than the signal path which are powered from the battery.
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