# US 11,183,165 B2 · Electronic device, active noise reduction system, and active noise reduction method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,183,165 B2 - Document ID: US11183165B2 - Status: Granted - Kind: B2 - Application number: 17/127,411 - Filed: 2020-12-18 - Published: 2021-06-24 - Granted: 2021-11-23 - Earliest claimed: 2019-12-19 - Assignees: Chiun Mai Communication Systems, Inc. - Applicants: Chiun Mai Communication Systems, Inc. - Inventors: Chien-Kuan Chiang - Web page: https://patentgrep.com/patent/US11183165B2 ## CPC - G10K 11/1785: {Methods, e.g. algorithms; Devices (G10K11/1781, G10K11/1783 take precedence)} - G10K 11/17875: {using an error signal without a reference signal, e.g. pure feedback} - H05K 1/181: associated with surface mounted components - G10K 2210/1291: Anti-Vibration-Control, e.g. reducing vibrations in panels or beams - G10K 2210/3016: Control strategies, e.g. energy minimization or intensity measurements - G10K 2210/3217: Collocated sensor and cancelling actuator, e.g. "virtual earth" designs - G10K 2210/3226: Sensor details, e.g. for producing a reference or error signal - H05K 2201/10015: Non-printed capacitor - H05K 2201/10083: Electromechanical or electro-acoustic component, e.g. microphone - H05K 2201/2045: Protection against vibrations - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract An active noise reduction system includes a substrate, a number of capacitors mounted on the substrate, a noise sensor mounted on the substrate and used to collect a noise signal around the noise sensor, an actuator mounted on the substrate and used to generate vibrations, and a controller mounted on the substrate and electrically coupled to the noise sensor and the actuator. The controller is used to obtain the noise signal collected by the noise sensor and generate a control signal according to the noise signal to the actuator to control the actuator to generate vibrations having a same frequency and opposite phase as the noise signal to cancel out the vibrations generated by the plurality of capacitors and the vibrations of the substrate caused by the vibrations generated by the plurality of capacitors. An electronic device and an active noise reduction method are also provided. ## Claims ### Claim 1 An active noise reduction system comprising: a substrate; a plurality of capacitors mounted on the substrate; a noise sensor mounted on the substrate and used to collect a noise signal around the noise sensor; an actuator mounted on the substrate and used to generate vibrations; a controller mounted on the substrate and electrically coupled to the noise sensor and the actuator, the controller used to obtain the noise signal collected by the noise sensor and generate a control signal according to the noise signal to the actuator to control the actuator to generate vibrations having a same frequency and opposite phase as the noise signal to cancel out the vibrations generated by the plurality of capacitors and the vibrations of the substrate caused by the vibrations generated by the plurality of capacitors. ### Claim 2 (depends on 1) The active noise reduction system of claim 1, wherein: the actuator and the plurality of capacitors are mounted on a same surface of the substrate. ### Claim 3 (depends on 1) The active noise reduction system of claim 1, wherein: the noise sensor is used to collect the noise signal around the noise sensor according to a predetermined period; the controller is used to determine whether a noise value of the noise signal is greater than or equal to a predetermined value; the controller is used to generate a control signal to the actuator according to the noise signal to control the actuator to generate vibrations having a same frequency and opposite phase as the noise signal if the noise value of the noise signal is greater than or equal to the predetermined value to cancel out the vibrations generated by the plurality of capacitors and the vibrations of the substrate caused by the vibrations generated by the plurality of capacitors. ### Claim 4 (depends on 3) The active noise reduction system of claim 3, wherein: the controller is further used to determine whether a frequency of the noise signal is within a predetermined frequency range; the controller is used to determine whether the noise value of the noise signal is greater than or equal to the predetermined value if the frequency of the noise signal is within the predetermined frequency range. ### Claim 5 (depends on 3) The active noise reduction system of claim 3, wherein: the controller is further used to determine whether the noise value of the noise signal decreases; the controller is used to continue to generate a control signal to the actuator according to the noise signal to control the actuator to generate vibrations having a same frequency and opposite phase as the noise signal if the noise value of the noise signal decreases to cancel out the vibrations generated by the plurality of capacitors and the vibrations of the substrate caused by the vibrations generated by the plurality of capacitors. ### Claim 6 An electronic device comprising an active noise reduction system, the active noise reduction system comprising: a substrate; a plurality of capacitors mounted on the substrate; a noise sensor mounted on the substrate and used to collect a noise signal around the noise sensor; an actuator mounted on the substrate and used to generate vibrations; a controller mounted on the substrate and electrically coupled to the noise sensor and the actuator, the controller used to obtain the noise signal collected by the noise sensor and generate a control signal according to the noise signal to the actuator to control the actuator to generate vibrations having a same frequency and opposite phase as the noise signal to cancel out the vibrations generated by the plurality of capacitors and the vibrations of the substrate caused by the vibrations generated by the plurality of capacitors. ### Claim 7 (depends on 6) The electronic device of claim 6, wherein: the actuator and the plurality of capacitors are mounted on a same surface of the substrate. ### Claim 8 (depends on 6) The electronic device of claim 6, wherein: the noise sensor is used to collect the noise signal around the noise sensor according to a predetermined period; the controller is used to determine whether a noise value of the noise signal is greater than or equal to a predetermined value; the controller is used to generate a control signal to the actuator according to the noise signal to control the actuator to generate vibrations having a same frequency and opposite phase as the noise signal if the noise value of the noise signal is greater than or equal to the predetermined value to cancel out the vibrations generated by the plurality of capacitors and the vibrations of the substrate caused by the vibrations generated by the plurality of capacitors. ### Claim 9 (depends on 8) The electronic device of claim 8, wherein: the controller is further used to determine whether a frequency of the noise signal is within a predetermined frequency range; the controller is used to determine whether the noise value of the noise signal is greater than or equal to the predetermined value if the frequency of the noise signal is within the predetermined frequency range. ### Claim 10 (depends on 8) The electronic device of claim 8, wherein: the controller is further used to determine whether the noise value of the noise signal decreases; the controller is used to continue to generate a control signal to the actuator according to the noise signal to control the actuator to generate vibrations having a same frequency and opposite phase as the noise signal if the noise value of the noise signal decreases to cancel out the vibrations generated by the plurality of capacitors and the vibrations of the substrate caused by the vibrations generated by the plurality of capacitors. ### Claim 11 An active noise reduction method comprising: providing a substrate; providing a plurality of capacitors mounted on the substrate; providing a noise sensor mounted on the substrate, the noise sensor used to collect a noise signal around the noise sensor; providing an actuator mounted on the substrate, the plurality of capacitors mounted on a same surface of the substrate, and the actuator used to generate vibrations; obtaining the noise signal collected by the noise sensor; generating a control signal according to the noise signal to the actuator to control the actuator to generate vibrations having a same frequency and opposite phase as the noise signal to cancel out the vibrations generated by the plurality of capacitors and the vibrations of the substrate caused by the vibrations generated by the plurality of capacitors. ### Claim 12 (depends on 11) The active noise reduction method of claim 11, further comprising: collecting the noise signal around the noise sensor according to a predetermined period; determining whether a noise value of the noise signal is greater than or equal to a predetermined value; generating a control signal to the actuator according to the noise signal to control the actuator to generate vibrations having a same frequency and opposite phase as the noise signal if the noise value of the noise signal is greater than or equal to the predetermined value to cancel out the vibrations generated by the plurality of capacitors and the vibrations of the substrate caused by the vibrations generated by the plurality of capacitors. ### Claim 13 (depends on 12) The active noise reduction method of claim 12, further comprising: determining whether a frequency of the noise signal is within a predetermined frequency range; determining whether the noise value of the noise signal is greater than or equal to the predetermined value if the frequency of the noise signal is within the predetermined frequency range. ### Claim 14 (depends on 12) The active noise reduction method of claim 12, further comprising: determining whether the noise value of the noise signal decreases; continuing to generate a control signal to the actuator according to the noise signal to control the actuator to generate vibrations having the same frequency and opposite phase as the noise signal if the noise value of the noise signal decreases to cancel out the vibrations generated by the plurality of capacitors and the vibrations of the substrate caused by the vibrations generated by the plurality of capacitors.