公开(公告)号：US10212514B2

公开(公告)日：2019-02-19

申请号：US15918705

申请日：2018-03-12

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Roger Serwy ,  Jason W. Lawrence ,  Firas Azrai ,  Jeffrey Allen May ,  Jie Su

IPC: H04R3/00 ,  H04R29/00 ,  H03F3/21 ,  H03F3/183 ,  H04R1/10 ,  H03F1/52 ,  H03G3/20

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.

公开(公告)号：US10356522B2

公开(公告)日：2019-07-16

申请号：US15547850

申请日：2016-02-01

Applicant: Cirrus Logic International Semiconductor Ltd.

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.

公开(公告)号：US10231050B2

公开(公告)日：2019-03-12

申请号：US15463377

申请日：2017-03-20

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Roger Serwy ,  Jason W. Lawrence ,  Firas Azrai ,  Jeffrey Allen May

IPC: H03G11/00 ,  H04R3/00 ,  H03F3/183 ,  H03F3/21 ,  H04R3/04 ,  H04R29/00 ,  H03G3/00 ,  H03G3/30 ,  H03G3/20

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.