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    Reproducibility of haptic waveform
    22.
    发明授权
    Reproducibility of haptic waveform 有权

    公开(公告)号：US11847906B2

    公开(公告)日：2023-12-19

    申请号：US17728668

    申请日：2022-04-25

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Jeffrey D. Alderson ,  John L. Melanson ,  Anthony S. Doy ,  Eric Lindemann

    IPC: H04B3/36 ,  G08B6/00 ,  B06B1/04

    CPC classification number: G08B6/00 ,  B06B1/045

    Abstract: A system may include an electromagnetic load capable of generating a haptic event and a haptic processor configured to receive at least one first parameter indicative of a desired perception of the haptic event to a user of a device comprising the electromagnetic load, receive at least one second parameter indicative of one or more characteristics of the device, and process the at least one first parameter and the at least one second parameter to generate a driving signal to the electromagnetic load in order to produce the desired perception to the user despite variances in the device that cause an actual perception of the haptic event to vary from the desired perception.

    Identifying mechanical impedance of an electromagnetic load using least-mean-squares filter
    25.
    发明授权
    Identifying mechanical impedance of an electromagnetic load using least-mean-squares filter 有权

    公开(公告)号：US11509292B2

    公开(公告)日：2022-11-22

    申请号：US16559238

    申请日：2019-09-03

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Emmanuel Marchais ,  Pablo Peso Parada ,  Eric Lindemann

    IPC: G06F13/00 ,  H03H17/06 ,  H03H7/12 ,  G06F3/01 ,  H02N2/06 ,  G01H15/00

    Abstract: A method for identifying a mechanical impedance of an electromagnetic load may include generating a waveform signal for driving an electromagnetic load and, during driving of the electromagnetic load by the waveform signal or a signal derived therefrom, receiving a current signal representative of a current associated with the electromagnetic load and a back electromotive force signal representative of a back electromotive force associated with the electromagnetic load. The method may also include implementing an adaptive filter to identify parameters of the mechanical impedance of the electromagnetic load, wherein an input of a coefficient control for adapting coefficients of the adaptive filter is a first signal derived from the back electromotive force signal and a target of the coefficient control for adapting coefficients of the adaptive filter is a second signal derived from the current signal.

    Non linear predictive model for haptic waveform generation
    26.
    发明授权
    Non linear predictive model for haptic waveform generation 有权

    公开(公告)号：US11238709B2

    公开(公告)日：2022-02-01

    申请号：US16841113

    申请日：2020-04-06

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Emmanuel Marchais ,  Eric Lindemann ,  Carl L. Stahl

    IPC: G08B6/00 ,  G06F3/01

    Abstract: A system includes a sequencer that divides a reference waveform into reference sequences, a sequence adjuster, and a model that models non-linearities of a haptic rendering signal chain that includes a haptic transducer load and a driver to the load. For each reference sequence: the sequence adjuster transforms the reference sequence into a test sequence using one or more parameters (e.g., changes reference sequence amplitude and/or period), the model generates an output in response to the test sequence, an error signal is generated that measures a difference between the output and the reference sequence, and if the error signal is above a threshold the parameters are adjusted based on the error signal. These operations are repeated until the error signal is below the threshold in which case the test sequence becomes a selected sequence, which is then sent to the haptic rendering signal chain.

    Adaptive localization of vibrational energy in a system with multiple vibrational transducers
    27.
    发明授权
    Adaptive localization of vibrational energy in a system with multiple vibrational transducers 有权

    公开(公告)号：US11154905B2

    公开(公告)日：2021-10-26

    申请号：US16263286

    申请日：2019-01-31

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Eric Lindemann

    IPC: H04R25/00 ,  B06B1/06 ,  H04R3/04 ,  H04R9/04

    Abstract: A system may include a vibrating surface, a first mechanical transducer mechanically coupled to the vibrating surface, a second mechanical transducer mechanically coupled to the vibrating surface at a location different than that of the first mechanical transducer, a first signal path for driving the first mechanical transducer, wherein the first signal path comprises a first amplifier and a first filter having a first frequency response, a second signal path for driving the second mechanical transducer, wherein the second signal path comprises a second amplifier and a second filter having a second frequency response, and a control subsystem. The control subsystem may include an analysis block configured to cross-correlate a first vibrational energy at a first location of the vibrating surface with a second vibrational energy at a second location of the vibrating surface and a coefficient control block configured to adaptively modify at least one of the first frequency response and the second frequency response responsive to cross-correlation of the first vibrational energy and the second vibrational energy in order to maximize differences between the first vibrational energy and the second vibrational energy.

    Bass enhancement
    28.
    发明授权
    Bass enhancement 有权

    公开(公告)号：US11109155B2

    公开(公告)日：2021-08-31

    申请号：US15435574

    申请日：2017-02-17

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Eric Lindemann

    IPC: H04R3/04 ,  H03G9/02 ,  G10L21/0208 ,  G10L25/21 ,  H03G3/30 ,  H03G5/16

    Abstract: A bass enhancement may be applied to improve the perception of low-frequency sounds by a user of an electronic device. A distortion function may be applied to the audio signal that results in creation of higher frequency content related to the low-frequency sounds. This higher frequency content may be interpreted by a listener's ear in a similar manner as the low-frequency sounds. The distortion function may be a Sigmoid function. Bass enhancements may also include scaling of the audio signal prior to distortion, adaptation of the distortion, or gap band filtering prior to the distortion.

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