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公开(公告)号：US12176781B2
公开(公告)日：2024-12-24
申请号：US16816833
申请日：2020-03-12
Inventor： Eric Lindemann , John L. Melanson , Emmanuel Marchais , Carl Lennart Ståhl
Abstract: A system for estimating parameters of an electromagnetic load may include an input for receiving an input excitation signal to the electromagnetic load, a broadband content estimator that identifies at least one portion of the input excitation signal having broadband content, and a parameter estimator that uses the at least one portion of the input excitation signal to estimate and output one or more parameters of the electromagnetic load.
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公开(公告)号：US11228840B2
公开(公告)日：2022-01-18
申请号：US16040853
申请日：2018-07-20
Inventor： Eric Lindemann , Itisha Tyagi , John L. Melanson
IPC: H04R7/04
Abstract: Embodiments described herein provide an audio device and a method of operating the audio device. The audio device comprises at least one surface, a first surface transducer positioned to excite first modes of oscillation in a first surface of the at least one surface, and a second surface transducer positioned to excite second modes of oscillation in a second surface of the at least one surface, wherein the first modes of oscillation are of a higher frequency than the second modes of oscillation.
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公开(公告)号：US11228284B2
公开(公告)日：2022-01-18
申请号：US16272215
申请日：2019-02-11
Inventor： Eric Lindemann , Itisha Tyagi
Abstract: A method for controlling one or more parameters of an amplifier system may include receiving an indication of a physical quantity associated with the amplifier system, determining one or more parameters of the amplifier system in response to the indication, and causing the amplifier system to operate in accordance with the one or more parameters.
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公开(公告)号：US10771021B2
公开(公告)日：2020-09-08
申请号：US16269063
申请日：2019-02-06
Inventor： Eric Lindemann
Abstract: A system for thermally protecting an amplifier driving a capacitive load may include a low-pass filter configured to filter, with a variable cutoff frequency, an input signal to generate a filtered input signal, wherein the amplifier is configured to receive the filtered input signal and amplify the filtered input signal to generate a driving signal to the capacitive load and a controller configured to receive a real-time estimate of a temperature associated with the amplifier and vary the variable cutoff frequency as a function of the temperature.
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公开(公告)号：US20180242083A1
公开(公告)日：2018-08-23
申请号：US15435574
申请日：2017-02-17
Inventor： Eric Lindemann
IPC: H04R3/04 , G10L21/0208 , G10L25/21 , H03G3/30
CPC classification number: H04R3/04 , G10L21/0208 , G10L25/21 , H03G3/3005 , H03G5/165 , H03G9/025
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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Patent Agency Ranking
公开(公告)号：US11513019B2
公开(公告)日：2022-11-29
申请号：US17128676
申请日：2020-12-21
Inventor： Eric Lindemann , Pablo Peso Parada , Tanner Rosenthal , Siddharth Maru
Abstract: A baseline unit for use in a sensor system, the sensor system comprising N force sensors which output N sensor signals, respectively, where N≥1, the baseline unit configured to: monitor a measure of a rate of change of a sensor test signal, the sensor test signal being one of said N sensor signals or a signal derived from one or more of said N sensor signals; and in dependence upon the measure of the rate of change, control a stored baseline setting to control how a baseline test signal is calculated from said N sensor signals using a baseline-calculation method, the baseline-calculation method configured by the currently-stored baseline setting.
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公开(公告)号：US20220329216A1
公开(公告)日：2022-10-13
申请号：US17521268
申请日：2021-11-08
Inventor： Leyi Yin , John L. Melanson , Eric Lindemann , Amar Vellanki , Jianhao Chen , Venugopal Choukinishi , Wai-Shun Shum , Xiaofan Fei
Abstract: A multi-path audio amplification system that provides an output drive signal to electromechanical output transducers provides improved undistorted headroom, reduced path switching noise, and/or improved frequency response performance. Multiple signal amplification paths receive an audio input signal and have corresponding multiple output stages that have differing output impedances. A mode selector selects an active one of the multiple signal amplification paths is selected to supply the output drive signal. Outputs of the multiple output stages are coupled to the electromechanical transducer to provide the output drive signal and at least one of the multiple signal amplification paths includes an equalization filter for filtering the audio input signal to compensate for phase or gain differences referenced from the input to the outputs of the multiple output stages due to interaction between the differing output impedances and an impedance of the electromechanical transducer.
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公开(公告)号：US11263877B2
公开(公告)日：2022-03-01
申请号：US16906576
申请日：2020-06-19
Inventor： Emmanuel Marchais , Eric Lindemann , Carl L. Ståhl
Abstract: A method for identifying a mechanical impedance of an electromagnetic load may include generating a waveform signal for driving an electromagnetic load, the waveform signal comprising a first tone at a first driving frequency and a second tone at a second driving frequency. The method may also include 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 further include determining amplitude and phase information of the current signal responsive to the first tone and second tone, determining amplitude and phase information of the back electromotive force signal responsive to the first tone and second tone, and identifying parameters of the mechanical impedance of the electromagnetic load based on the amplitude and phase information of the current signal and the amplitude and phase information of the back electromotive force signal.
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公开(公告)号：US20200342724A1
公开(公告)日：2020-10-29
申请号：US16841113
申请日：2020-04-06
Inventor： Emmanuel Marchais , Eric Lindemann , Carl L. Stahl
IPC: G08B6/00
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.
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公开(公告)号：US10225654B1
公开(公告)日：2019-03-05
申请号：US15698142
申请日：2017-09-07
Inventor： Eric Lindemann , Ziad Hatab
Abstract: A spectral tilt of an audio signal is used to determine whether a speaker will introduce perceptible distortion during playback of the audio signal. The spectral tilt may be indicated by determining a ratio between energy in a distortion-producing frequency band and energy in a distortion-masking frequency band. Based on the determined spectral tilt, the distortion-producing frequency band may be attenuated to reduce the distortion introduced by the speaker. Additionally, the distortion-masking frequency band may be amplified to reduce perceptibility of the distortion produced by the speaker.
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