Patents Assigned to xMEMS Labs, Inc.
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Patent number: 11395081Abstract: An acoustic testing method includes providing an electrical signal to a wafer, receiving a sound wave generated by the acoustic transducer according to the electrical signal, and generating a sensing result for determining an acoustic functionality of the acoustic transducer. The wafer includes a plurality of acoustic transducers, and the electrical signal is provided to an acoustic transducer within the wafer.Type: GrantFiled: September 2, 2020Date of Patent: July 19, 2022Assignee: xMEMS Labs, Inc.Inventors: Chiung C. Lo, Yuan-Shuang Liu, David Hong
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Publication number: 20220225031Abstract: An air-pulse generating device includes a membrane structure, a valve structure, and a cover structure. A chamber is formed between the membrane structure, the valve structure and the cover structure. An air wave vibrating at an operating frequency is formed within the chamber. The valve structure is configured to be actuated to perform an open-and-close movement to form at least one opening. The at least one opening connects air inside the chamber with air outside the chamber. The open-and-close movement is synchronous with the operating frequency.Type: ApplicationFiled: December 17, 2021Publication date: July 14, 2022Applicant: xMEMS Labs, Inc.Inventors: Jemm Yue Liang, Wen-Chien Chen, Jye Ren
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Publication number: 20220224999Abstract: An air-pulse generating device includes a membrane structure, a valve structure, and a cover structure. A chamber is formed between the membrane structure, the valve structure and the cover structure. An air wave vibrating at an operating frequency is formed within the chamber. The valve structure is configured to be actuated to perform an open-and-close movement to form at least one opening. The at least one opening connects air inside the chamber with air outside the chamber. The open-and-close movement is synchronous with the operating frequency.Type: ApplicationFiled: December 17, 2021Publication date: July 14, 2022Applicant: xMEMS Labs, Inc.Inventors: Jemm Yue Liang, Wen-Chien Chen, Jye Ren
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Publication number: 20220225032Abstract: An air-pulse generating device includes a membrane structure, a valve structure, and a cover structure. A chamber is formed between the membrane structure, the valve structure and the cover structure. An air wave vibrating at an operating frequency is formed within the chamber. The valve structure is configured to be actuated to perform an open-and-close movement to form at least one opening. The at least one opening connects air inside the chamber with air outside the chamber. The open-and-close movement is synchronous with the operating frequency.Type: ApplicationFiled: December 17, 2021Publication date: July 14, 2022Applicant: xMEMS Labs, Inc.Inventors: Jemm Yue Liang, Wen-Chien Chen, Jye Ren
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Patent number: 11388534Abstract: An audio device includes an electroacoustic convertor and a differential amplifier. The electroacoustic convertor has a first output terminal and a second output terminal. A first polarity of a first capacitance variation corresponding to the first output terminal is opposite to a second polarity of a second capacitance variation corresponding to the second output terminal. The first capacitance variation and the second capacitance variation are associated with a magnitude of acoustic pressure. The differential amplifier has a first input terminal coupled to the first output terminal and a second input terminal coupled to the second output terminal.Type: GrantFiled: July 19, 2020Date of Patent: July 12, 2022Assignee: xMEMS Labs, Inc.Inventor: Jemm Yue Liang
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Patent number: 11387822Abstract: A filter is disclosed. The filter includes at least one first multiplication approximation unit, for approximating at least one first multiplication operation corresponding to at least one first coefficient with at least one first bit-wise shift operation; and at least one second multiplication approximation unit, for approximating at least one second multiplication operation corresponding to at least one second coefficient with a plurality of second bit-wise shift operations and at least one addition operation.Type: GrantFiled: August 11, 2021Date of Patent: July 12, 2022Assignee: xMEMS Labs, Inc.Inventors: Jemm Yue Liang, Hsi-Sheng Chen
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Patent number: 11368804Abstract: A testing apparatus including a testing platform, a loading device, a testing-signal generating device, a sound sensing device, a control unit, and an unloading device is disclosed. The loading device is configured to load a plurality of under-test devices to the testing platform. The testing-signal generating device is configured to generate at least one testing signal. The plurality of under-test devices receives the at least one testing signal and produces at least one testing sound-according to the at least one testing signal. The sound sensing device is configured to receive the at least one testing sound. The control unit controls the unloading device to unload the plurality of under-test devices from the testing platform and controls the unloading device to categorize the plurality of under-test devices into a plurality of groups according to the at least one testing sound received by the sound sensing device.Type: GrantFiled: June 30, 2021Date of Patent: June 21, 2022Assignee: xMEMS Labs, Inc.Inventors: Yuan-Shuang Liu, David Hong, Ming-Che Chuang, Ping-Sheng Wang
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Patent number: 11336182Abstract: A bidirectional charging and discharging circuit is coupled between a voltage source and a capacitive load and configured to drive the capacitive load. The bidirectional charging and discharging circuit includes a first switch, comprising a first terminal coupled to the voltage source; a second switch, comprising a first terminal coupled to a second terminal of the first switch, and a second terminal coupled to a ground; an inductor, comprising a first terminal coupled to the second terminal of the first switch and the first terminal of the second switch; a third switch, comprising a first terminal coupled to a second terminal of the inductor, and a second terminal coupled to a first terminal of the capacitive load; and a fourth switch, comprising a first terminal coupled to the second terminal of the inductor and the first terminal of the third switch, and a second terminal coupled to a ground.Type: GrantFiled: June 20, 2021Date of Patent: May 17, 2022Assignee: xMEMS Labs, Inc.Inventors: Jing-Meng Liu, Jemm Yue Liang
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Patent number: 11323797Abstract: An acoustic transducer is disposed within a wearable sound device or to be disposed within the wearable sound device. The acoustic transducer includes a first anchor structure and a first flap. The first flap includes a first end and a second end. The first end is anchored by the first anchor structure, and the second end is configured to perform a first up-and-down movement to form a vent temporarily. The first flap partitions a space into a first volume to be connected to an ear canal and a second volume to be connected to an ambient of the wearable sound device. The ear canal and the ambient are connected via the vent temporarily opened.Type: GrantFiled: June 11, 2021Date of Patent: May 3, 2022Assignee: xMEMS Labs, Inc.Inventors: Jemm Yue Liang, Chiung C. Lo, Martin George Lim, Wen-Chien Chen, Michael David Housholder, David Hong
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Patent number: 11303295Abstract: A signal density modulation (SDM) encoder includes a first subtractor, a sigma circuit and a multi-bit quantizer. The first subtractor is used for receiving an input signal. The sigma circuit is coupled to the first subtractor. The multi-bit quantizer, coupled to the first subtractor and the sigma circuit, is configured to generate an output signal. The sigma circuit or the multi-bit quantizer produces a first feedback signal to the first subtractor. The first subtractor performs a subtraction operation according to the first feedback signal and the input signal, and generates a delta signal. The sigma circuit performs an operation on the delta signal, such that the SDM encoder has a noise transfer function having a high pass filtering effect. The noise transfer function is a ratio of a quantization error brought by the multi-bit quantizer with respect to the input signal. The output signal has more than two levels.Type: GrantFiled: October 26, 2021Date of Patent: April 12, 2022Assignee: xMEMS Labs, Inc.Inventors: Jemm Yue Liang, Hsi-Sheng Chen
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Patent number: 11304005Abstract: A crossover circuit, disposed within a sound producing device including a first sound producing cell driven by a first driving signal and a second sound producing cell driven by a second driving signal, includes a first filter receiving an input signal at an input terminal of the first filter, a first subtraction circuit, and a second filter coupled between the output terminal of the first filter and the second input terminal of the first subtraction circuit. A first input terminal of the first subtraction circuit is coupled to the input terminal of the first filter; a second input terminal of the first subtraction circuit is coupled to an output terminal of the first filter. The crossover circuit produces the first driving signal and the second driving signal according to a first output signal of the first subtraction circuit and a second output signal of the first filter respectively.Type: GrantFiled: September 28, 2021Date of Patent: April 12, 2022Assignee: xMEMS Labs, Inc.Inventors: Jemm Yue Liang, Hsi-Sheng Chen, Chiung C. Lo, Wen-Chien Chen, Chun-I Chang, Hao-Hsin Chang, Chieh-Yao Chang
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Patent number: 11290015Abstract: A driving circuit is disclosed. The driving circuit includes a charging circuit, coupled between a voltage source and a load, configured to form a first current from the voltage source to the load; and a discharging circuit, coupled between the voltage source and the load, configured to form a second current from the load back to the voltage source.Type: GrantFiled: September 15, 2020Date of Patent: March 29, 2022Assignee: xMEMS Labs, Inc.Inventor: Jemm Yue Liang
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Publication number: 20220085799Abstract: A filter is disclosed. The filter includes at least one first multiplication approximation unit, for approximating at least one first multiplication operation corresponding to at least one first coefficient with at least one first bit-wise shift operation; and at least one second multiplication approximation unit, for approximating at least one second multiplication operation corresponding to at least one second coefficient with a plurality of second bit-wise shift operations and at least one addition operation.Type: ApplicationFiled: August 11, 2021Publication date: March 17, 2022Applicant: xMEMS Labs, Inc.Inventors: Jemm Yue Liang, Hsi-Sheng Chen
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Patent number: 11271480Abstract: A method, applied in a driving circuit including a bidirectional circuit coupled between a voltage source and a load, includes receiving a feedback signal from the load and an input signal; generating a plurality of pulse width modulation (PWM) signals according to the input signal and the feedback signal; driving the load by the bidirectional circuit according to the plurality of PWM signals such that the input signal and the feedback signal are substantially proportional to each other. The input signal is a time varying signal. The step of generating a PWM signal among the plurality of PWM signals according to the input signal and the feedback signal includes determining a difference according to the input signal and the feedback signal; and generating the PWM signal with a pulse width. The pulse width is determined according to the difference.Type: GrantFiled: July 20, 2021Date of Patent: March 8, 2022Assignee: xMEMS Labs, Inc.Inventor: Jemm Yue Liang
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Patent number: 11252511Abstract: A package structure includes a housing and a sound producing chip. The sound producing chip is disposed within the housing. The sound producing chip includes a membrane and an actuator. The membrane includes a coupling plate and a spring structure connected to the coupling plate. The actuator is configured to receive a driving signal to actuate the membrane. The spring structure is situated between the coupling plate and the actuator. The coupling plate is actuated to move by the actuator via the spring structure.Type: GrantFiled: May 31, 2021Date of Patent: February 15, 2022Assignee: xMEMS Labs, Inc.Inventors: Chiung C. Lo, David Hong, Jemm Yue Liang, Lei Chen, Hai-Hung Wen, JengYaw Jiang, Martin George Lim, Wen-Chien Chen, Hsien-Ken Liao, Chun-I Chang
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Patent number: 11251802Abstract: A digital-to-analog converter (DAC) includes a plurality of reference modules, an output capacitor configured to output the analog voltage, and a sharing switch coupled between the output capacitor and the reference modules. The reference modules are mutually connected in parallel. Each reference module includes a reference capacitor and a reference switch connected in series. A plurality of reference capacitances of the reference capacitors are substantially identical. The reference switches are controlled by a plurality of control signals. The control signals are corresponding to a control code. The DAC produces an analog voltage according to the control code. An analog difference, between a first analog voltage corresponding to a first control code and a second analog voltage corresponding to a second control code, monotonically increases or monotonically decreases as a first value corresponding to the first control code increases. The first control code is consecutive to the second control code.Type: GrantFiled: July 20, 2021Date of Patent: February 15, 2022Assignee: xMEMS Labs, Inc.Inventor: Jemm Yue Liang
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Publication number: 20220038108Abstract: A digital-to-analog converter (DAC) includes a plurality of reference modules, an output capacitor configured to output the analog voltage, and a sharing switch coupled between the output capacitor and the reference modules. The reference modules are mutually connected in parallel. Each reference module includes a reference capacitor and a reference switch connected in series. A plurality of reference capacitances of the reference capacitors are substantially identical. The reference switches are controlled by a plurality of control signals. The control signals are corresponding to a control code. The DAC produces an analog voltage according to the control code. An analog difference, between a first analog voltage corresponding to a first control code and a second analog voltage corresponding to a second control code, monotonically increases or monotonically decreases as a first value corresponding to the first control code increases. The first control code is consecutive to the second control code.Type: ApplicationFiled: July 20, 2021Publication date: February 3, 2022Applicant: xMEMS Labs, Inc.Inventor: Jemm Yue Liang
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Publication number: 20220037997Abstract: A method, applied in a driving circuit including a bidirectional circuit coupled between a voltage source and a load, includes receiving a feedback signal from the load and an input signal; generating a plurality of pulse width modulation (PWM) signals according to the input signal and the feedback signal; driving the load by the bidirectional circuit according to the plurality of PWM signals such that the input signal and the feedback signal are substantially proportional to each other. The input signal is a time varying signal. The step of generating a PWM signal among the plurality of PWM signals according to the input signal and the feedback signal includes determining a difference according to the input signal and the feedback signal; and generating the PWM signal with a pulse width. The pulse width is determined according to the difference.Type: ApplicationFiled: July 20, 2021Publication date: February 3, 2022Applicant: xMEMS Labs, Inc.Inventor: Jemm Yue Liang
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Publication number: 20220021304Abstract: A bidirectional charging and discharging circuit is coupled between a voltage source and a capacitive load and configured to drive the capacitive load. The bidirectional charging and discharging circuit includes a first switch, comprising a first terminal coupled to the voltage source; a second switch, comprising a first terminal coupled to a second terminal of the first switch, and a second terminal coupled to a ground; an inductor, comprising a first terminal coupled to the second terminal of the first switch and the first terminal of the second switch; a third switch, comprising a first terminal coupled to a second terminal of the inductor, and a second terminal coupled to a first terminal of the capacitive load; and a fourth switch, comprising a first terminal coupled to the second terminal of the inductor and the first terminal of the third switch, and a second terminal coupled to a ground.Type: ApplicationFiled: June 20, 2021Publication date: January 20, 2022Applicant: xMEMS Labs, Inc.Inventors: Jing-Meng Liu, Jemm Yue Liang
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Publication number: 20220014851Abstract: A crossover circuit, disposed within a sound producing device including a first sound producing cell driven by a first driving signal and a second sound producing cell driven by a second driving signal, includes a first filter receiving an input signal at an input terminal of the first filter, a first subtraction circuit, and a second filter coupled between the output terminal of the first filter and the second input terminal of the first subtraction circuit. A first input terminal of the first subtraction circuit is coupled to the input terminal of the first filter; a second input terminal of the first subtraction circuit is coupled to an output terminal of the first filter. The crossover circuit produces the first driving signal and the second driving signal according to a first output signal of the first subtraction circuit and a second output signal of the first filter respectively.Type: ApplicationFiled: September 28, 2021Publication date: January 13, 2022Applicant: xMEMS Labs, Inc.Inventors: Jemm Yue Liang, Hsi-Sheng Chen, Chiung C. Lo, Wen-Chien Chen, Chun-I Chang, Hao-Hsin Chang, Chieh-Yao Chang