# US 11,910,148 B2 · Method for determining capacitance reference, apparatus for determining capacitance reference, and device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,910,148 B2 - Document ID: US11910148B2 - Status: Granted - Kind: B2 - Application number: 17/496,428 - Filed: 2021-10-07 - Published: 2022-08-11 - Granted: 2024-02-20 - Earliest claimed: 2021-02-10 - Assignees: Shenzhen Goodix Technology Co., Ltd. - Applicants: Shenzhen Goodix Technology Co., Ltd. - Inventors: Haijun Wei - Web page: https://patentgrep.com/patent/US11910148B2 ## CPC - H04R 1/1041: {Mechanical or electronic switches, or control elements (switches in general H01H)} - H04R 1/1016: {Earpieces of the intra-aural type} - H04R 19/00: Electrostatic transducers - H04R 2201/10: Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups - H04R 2420/07: Applications of wireless loudspeakers or wireless microphones - H04R 2460/03: Aspects of the reduction of energy consumption in hearing devices - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) ## Abstract A method for determining a capacitance reference, an apparatus for determining a capacitance reference, and a device are provided. The method is applied to a device with double-layer capacitive sensors, and the method comprises: obtaining a first differential capacitance value of the double-layer capacitive sensors, the first differential capacitance value being a minimum differential capacitance value obtained when the device is out of a box, and the box being a matching device paired with the device and used to receive the device; and determining a latest differential capacitance reference value according to the first differential capacitance value and a differential capacitance reference value. By tracking and updating the differential capacitance reference value, a more accurate capacitance reference is provided to ensure the accuracy of capacitance change detection, and then to ensure the accuracy of detection on the behavior state of the device. ## Claims ### Claim 1 A method for determining a capacitance reference, applied to a device with double-layer capacitive sensors, the method comprising: obtaining a first differential capacitance value of the double-layer capacitive sensors, the first differential capacitance value being a minimum differential capacitance value among a plurality of differential capacitance values of the double-layer capacitive sensors obtained according to a preset sampling period within a preset time period when the device is out of a box, and the box being a matching device paired with the device and used to receive the device; and determining a latest differential capacitance reference value according to the first differential capacitance value and a differential capacitance reference value. ### Claim 2 (depends on 1) The method according to claim 1, wherein the method further comprises: obtaining a second differential capacitance value of the double-layer capacitive sensors when the device is in the box, and determining whether the device is abnormal according to the second differential capacitance value and the first differential capacitance value; and when it is determined that the device is not abnormal, determining the latest differential capacitance reference value by a preset calibration method according to the first differential capacitance value and the differential capacitance reference value. ### Claim 3 (depends on 2) The method according to claim 2, wherein the first differential capacitance value is a minimum differential capacitance value obtained within a time before the device is in the box. ### Claim 4 (depends on 2) The method according to claim 2, wherein the determining whether the device is abnormal according to the second differential capacitance value and the first differential capacitance value comprises: when the first differential capacitance value is less than or equal to the second differential capacitance value, determining that the device is not abnormal; or, when the first differential capacitance value is greater than the second differential capacitance value, determining that the device is abnormal. ### Claim 5 (depends on 1) The method according to claim 1, wherein the determining a latest differential capacitance reference value according to the first differential capacitance value and a differential capacitance reference value comprises: when the device is out of the box and out of an ear, determining, according to the first differential capacitance value and the differential capacitance reference value, whether the differential capacitance reference value needs to be calibrated; if the differential capacitance reference value needs to be calibrated, using a differential capacitance reference value calibrated by the preset calibration method as the latest differential capacitance reference value; or if the differential capacitance reference value does not need to be calibrated, using the differential capacitance reference value as the latest differential capacitance reference value. ### Claim 6 (depends on 2) The method according to claim 2, wherein the determining the latest differential capacitance reference value according to the first differential capacitance value and the differential capacitance reference value comprises: when an absolute value of the difference between the first differential capacitance value and the differential capacitance reference value is greater than a preset first threshold, determining to calibrate the differential capacitance reference value; or, when the absolute value of the difference between the first differential capacitance value and the differential capacitance reference value is less than or equal to the preset first threshold, determining not to calibrate the differential capacitance reference value, the first threshold being used to indicate that the double-layer capacitive sensors are in an abnormal state. ### Claim 7 (depends on 6) The method according to claim 6, wherein the preset calibration method comprises: if the first differential capacitance value is greater than the differential capacitance reference value, determining the calibrated latest differential capacitance reference value as: c(ref)calibrated=c(ref)+(c(min)−c(ref))*k1; or, if the first differential capacitance value is less than the differential capacitance reference value, determining the calibrated latest differential capacitance reference value as: c(ref)calibrated=c(ref)+(c(min)−c(ref))*k2, wherein c(ref) is the differential capacitance reference value, c(ref)calibrated is the calibrated latest differential capacitance reference value, c(min) is the first differential capacitance value, k1 and k2 are calibration coefficients, k1 is greater than or equal to 0 and less than 1, k2 is greater than or equal to 0 and less than 1, and k1 is greater than k2. ### Claim 8 An apparatus for determining a capacitance reference, applied to a device with double-layer capacitive sensors, the apparatus comprising: an obtaining module, configured to obtain a first differential capacitance value of the double-layer capacitive sensors, the first differential capacitance value being a minimum differential capacitance value among a plurality of differential capacitance values of the double-layer capacitive sensors obtained according to a preset sampling period within a preset time period when the device is out of a box, and the box being a matching device paired with the device and used to receive the device; and a processing module, configured to determine a latest differential capacitance reference value according to the first differential capacitance value and a differential capacitance reference value. ### Claim 9 (depends on 8) The apparatus according to claim 8, wherein the obtaining module is further configured to: obtain a second differential capacitance value of the double-layer capacitive sensors when the device is in the box, and determine whether the device is abnormal according to the second differential capacitance value and the first differential capacitance value; and when it is determined that the device is not abnormal, determine the latest differential capacitance reference value by a preset calibration method according to the first differential capacitance value and the differential capacitance reference value. ### Claim 10 (depends on 9) The apparatus according to claim 9, wherein the first differential capacitance value is a minimum differential capacitance value obtained within a time before the device is in the box. ### Claim 11 (depends on 9) The apparatus according to claim 9, wherein the processing module is specifically configured to: when the first differential capacitance value is less than or equal to the second differential capacitance value, determine that the device is not abnormal; or, when the first differential capacitance value is greater than the second differential capacitance value, determine that the device is abnormal. ### Claim 12 (depends on 8) The apparatus according to claim 8, wherein the processing module is specifically configured to: when the device is out of the box and out of an ear, determine, according to the first differential capacitance value and the differential capacitance reference value, whether the differential capacitance reference value needs to be calibrated; if the differential capacitance reference value needs to be calibrated, use a differential capacitance reference value calibrated by the preset calibration method as the latest differential capacitance reference value; or if the differential capacitance reference value does not need to be calibrated, use the differential capacitance reference value as the latest differential capacitance reference value. ### Claim 13 (depends on 9) The apparatus according to claim 9, wherein the processing module is specifically configured to: when an absolute value of the difference between the first differential capacitance value and the differential capacitance reference value is greater than a preset first threshold, determine to calibrate the differential capacitance reference value; or, when the absolute value of the difference between the first differential capacitance value and the differential capacitance reference value is less than or equal to the preset first threshold, determine not to calibrate the differential capacitance reference value, the first threshold being used to indicate that the double-layer capacitive sensors are in an abnormal state. ### Claim 14 (depends on 10) The apparatus according to claim 10, wherein the processing module is specifically configured to: when an absolute value of the difference between the first differential capacitance value and the differential capacitance reference value is greater than a preset first threshold, determine to calibrate the differential capacitance reference value; or, when the absolute value of the difference between the first differential capacitance value and the differential capacitance reference value is less than or equal to the preset first threshold, determine not to calibrate the differential capacitance reference value, the first threshold being used to indicate that the double-layer capacitive sensors are in an abnormal state. ### Claim 15 (depends on 11) The apparatus according to claim 11, wherein the processing module is specifically configured to: when an absolute value of the difference between the first differential capacitance value and the differential capacitance reference value is greater than a preset first threshold, determine to calibrate the differential capacitance reference value; or, when the absolute value of the difference between the first differential capacitance value and the differential capacitance reference value is less than or equal to the preset first threshold, determine not to calibrate the differential capacitance reference value, the first threshold being used to indicate that the double-layer capacitive sensors are in an abnormal state. ### Claim 16 (depends on 12) The apparatus according to claim 12, wherein the processing module is specifically configured to: when an absolute value of the difference between the first differential capacitance value and the differential capacitance reference value is greater than a preset first threshold, determine to calibrate the differential capacitance reference value; or, when the absolute value of the difference between the first differential capacitance value and the differential capacitance reference value is less than or equal to the preset first threshold, determine not to calibrate the differential capacitance reference value, the first threshold being used to indicate that the double-layer capacitive sensors are in an abnormal state. ### Claim 17 (depends on 16) The apparatus according to claim 16, wherein the processing module is further configured to: if the first differential capacitance value is greater than the differential capacitance reference value, determine the calibrated latest differential capacitance reference value as: c(ref)calibrated=c(ref)+(c(min)−c(ref))*k1; or, if the first differential capacitance value is less than the differential capacitance reference value, determine the calibrated latest differential capacitance reference value as: c(ref)calibrated=c(ref)+(c(min)−c(ref))*k2, wherein c(ref) is the differential capacitance reference value, c(ref)calibrated is the calibrated latest differential capacitance reference value, c(min) is the first differential capacitance value, k1 and k2 are calibration coefficients, k1 is greater than or equal to 0 and less than 1, k2 is greater than or equal to 0 and less than 1, and k1 is greater than k2. ### Claim 18 (depends on 1) A chip, the chip comprises a processor and a memory, the memory is configured to store a computer program, and the processor is configured to implement the computer program stored in the memory to execute the method according to claim 1. ### Claim 19 A device, comprising: double-layer sensors; and an apparatus, wherein the apparatus for determining a capacitance reference, applied to a device with double-layer capacitive sensors, the apparatus comprising: an obtaining module, configured to obtain a first differential capacitance value of the double-layer capacitive sensors, the first differential capacitance value being a minimum differential capacitance value among a plurality of differential capacitance values of the double-layer capacitive sensors obtained according to a preset sampling period within a preset time period when the device is out of a box, and the box being a matching device paired with the device and used to receive the device; and a processing module, configured to determine a latest differential capacitance reference value according to the first differential capacitance value and a differential capacitance reference value. ### Claim 20 (depends on 19) The device according to claim 19, wherein the device is a wireless earphone, and the box is an earphone box matching the earphone.