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Patent Agency Ranking
公开(公告)号：US20250024197A1
公开(公告)日：2025-01-16
申请号：US18353092
申请日：2023-07-16
Inventor： Emmanuel A. Marchais , Ziyan Zou , Chin Huang Yong
Abstract: The impedance of a connector, such as a flex cable, between a source and load affects the temperature and power consumption within an electronic system, such as a mobile device. According to embodiments described in this disclosure, the impedance of the flex cable may be separately tracked from the impedance of the source, which provides for improved power management within the electronic system. The impedance of the flex cable may be factored into determining a maximum available power to the load. The impedance of the flex cable may also be mapped to a temperature and used to manage power to maintain operation within temperature limits. Additional aspects of power management and impedance tracking for a connector are described herein.
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公开(公告)号：US11664000B1
公开(公告)日：2023-05-30
申请号：US17496253
申请日：2021-10-07
Inventor： Ziyan Zou , K. Joshua Bodon , Sandeep P. Sira
IPC: G10K11/178
CPC classification number: G10K11/17823 , G10K11/17815 , G10K11/17854 , G10K11/17875 , G10K11/17885
Abstract: An integrated circuit may include an output for providing an output signal to a transducer including both a source audio signal for playback to a listener and an anti-noise signal for countering the effect of ambient audio sounds in an acoustic output of the transducer, an error microphone input for receiving an error microphone signal indicative of the output of the transducer and the ambient audio sounds at the transducer, and a processing circuit. The processing circuit may implement a feedback path comprising a feedback filter having a response that generates a feedback anti-noise signal based on the error microphone signal, the feedback filter comprising a plurality of biquad filters and wherein the anti-noise signal is generated from the feedback anti-noise signal and an event detection and oversight control that detects that an ambient audio event is occurring that could cause the feedback filter to generate an undesirable component in the anti-noise signal, and controls filter coefficients of one or more of the plurality of biquad filters to reduce the undesirable component.
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公开(公告)号：US11159888B1
公开(公告)日：2021-10-26
申请号：US17025971
申请日：2020-09-18
Inventor： Ziyan Zou , Anthony S. Doy , Ning Li , Kaichow Lau , George E. Hardy , John L. Melanson
Abstract: Methods, systems, circuits and computer program products provide an output signal to drive an electromechanical transducer that selectively contains a cooling component when a thermal limit of a voice coil of the electromechanical transducer is exceeded and which air-cools the transducer by convection. An indication of a temperature of a voice coil of the electromechanical transducer is determined and compared with a thermal limit of the transducer. If the thermal limit of the transducer is exceeded by the indication of the temperature of the voice coil, the cooling component is introduced to the output signal that drives the transducer. The cooling component is a signal having a frequency within a low-frequency resonance portion of the response of the electromechanical transducer, so that additional air convection is caused at the transducer to remove heat from the voice coil due to the cooling component of the output signal.
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公开(公告)号：US11153682B1
公开(公告)日：2021-10-19
申请号：US17025960
申请日：2020-09-18
Inventor： Ning Li , George E. Hardy , Kaichow Lau , Anthony S. Doy , Ziyan Zou , John L. Melanson
Abstract: An audio output system for providing an output signal to a micro-speaker provides energy reduction and thermal protection by removing components of an input signal from which the output signal is generated, so that the audio power output system does not expend power reproducing portions of the audio information that would not be perceived by a listener. The micro-speaker has a resonant frequency such that substantial content of the audio information lies below the resonant frequency. A processing subsystem receives the audio information and generates the output signal by filtering the audio information with a response simulating the micro-speaker and an acoustic path to the listener, and comparing the filtered audio information with a frequency-dependent threshold of hearing. The processing subsystem then removes portions of the audio information that have an amplitude below the frequency-dependent threshold of hearing.
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公开(公告)号：US10820100B2
公开(公告)日：2020-10-27
申请号：US16803010
申请日：2020-02-27
Inventor： Carl Lennart Ståhl , Ning Li , Ziyan Zou
Abstract: Embodiments described herein relate to methods and apparatus for limiting the excursion of a transducer. The method comprises receiving a transducer signal; and limiting the transducer signal or a signal derived therefrom to generate a limited transducer signal for input into the transducer such that an electrical response caused by the limited transducer signal in an electrical model of the transducer would be less than a threshold electrical response, wherein the threshold electrical response has been determined by: inputting a stimulus input signal into the electrical model of the transducer, wherein the stimulus input signal is designed to cause the transducer to reach a maximum excursion; and determining the threshold electrical response as a maximum of the electrical response caused by the stimulus input signal in the electrical model of the transducer.
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