# US 11,310,613 B2 · Audio calibration method and device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,310,613 B2 - Document ID: US11310613B2 - Status: Granted - Kind: B2 - Application number: 17/094,039 - Filed: 2020-11-10 - Published: 2021-12-09 - Granted: 2022-04-19 - Earliest claimed: 2020-06-09 - Assignees: Merry Electronics (Suzhou) Co., Ltd. - Applicants: Merry Electronics(Suzhou) Co., Ltd. - Inventors: Hui Wu; Chunyan Hu; Tianliang Zhang - Web page: https://patentgrep.com/patent/US11310613B2 ## CPC - H04R 29/001: {for loudspeakers (H04R29/007 takes precedence)} - H04S 7/301: {Automatic calibration of stereophonic sound system, e.g. with test microphone} - H04R 1/20: Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purpose H04R5/00) - H04R 5/033: Headphones for stereophonic communication {(details thereof, e.g. relating to batteries, cables or control elements H04R1/10)} - 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) - H04S: STEREOPHONIC SYSTEMS ## Abstract Provided are an audio calibration method and device. The method includes: transmitting an audio calibration signal to a first loudspeaker and a second loudspeaker such that the first loudspeaker and the second loudspeaker generate sound signals; determining first loudspeaker sound information through a sound signal generated by the first loudspeaker and acquired by a first microphone and a sound signal generated by the first loudspeaker and acquired by the second microphone; determining second loudspeaker sound information through a sound signal generated by the second loudspeaker and acquired by the first microphone and a sound signal generated by the second loudspeaker and acquired by the second microphone; and determining a calibration parameter of the first loudspeaker or a calibration parameter of the second loudspeaker according to the first loudspeaker sound information and the second loudspeaker sound information. ## Claims ### Claim 1 An audio calibration method, executed by a processor built in a headphone which comprises a first loudspeaker, a second loudspeaker, a first microphone and a second microphone, and the audio calibration method comprising: transmitting an audio calibration signal to the first loudspeaker and the second loudspeaker such that the first loudspeaker and the second loudspeaker generate sound signals, wherein the first loudspeaker and the second loudspeaker are disposed opposite to each other; determining first loudspeaker sound information through a sound signal generated by the first loudspeaker and acquired by the first microphone and a sound signal generated by the first loudspeaker and acquired by the second microphone, wherein the first microphone and the second microphone are disposed opposite to each other; determining second loudspeaker sound information through a sound signal generated by the second loudspeaker and acquired by the first microphone and a sound signal generated by the second loudspeaker and acquired by the second microphone; and determining a calibration parameter of the first loudspeaker or a calibration parameter of the second loudspeaker according to the first loudspeaker sound information and the second loudspeaker sound information; wherein determining the calibration parameter of the first loudspeaker or the calibration parameter of the second loudspeaker according to the first loudspeaker sound information and the second loudspeaker sound information comprises: if a difference value between a sensitivity of the first loudspeaker sound information and a sensitivity of the second loudspeaker sound information is within a preset range, calculating a difference value between the first loudspeaker sound information and the second loudspeaker sound information; and taking the difference value between the first loudspeaker sound information and the second loudspeaker sound information as the calibration parameter of the first loudspeaker or the calibration parameter of the second loudspeaker. ### Claim 2 (depends on 1) The audio calibration method of claim 1, wherein the first loudspeaker sound information is an average value of the sound signal generated by the first loudspeaker and acquired by the first microphone and the sound signal generated by the first loudspeaker and acquired by the second microphone. ### Claim 3 (depends on 1) The audio calibration method of claim 1, wherein the second loudspeaker sound information is an average value of the sound signal generated by the second loudspeaker and acquired by the first microphone and the sound signal generated by the second loudspeaker and acquired by the second microphone. ### Claim 4 (depends on 1) The audio calibration method of claim 1, wherein taking the difference value between the first loudspeaker sound information and the second loudspeaker sound information as the calibration parameter of the first loudspeaker or the calibration parameter of the second loudspeaker comprises: if the difference value between the sensitivity of the first loudspeaker sound information and the sensitivity of the second loudspeaker sound information is greater than zero, taking the difference value between the first loudspeaker sound information and the second loudspeaker sound information as the calibration parameter of the first loudspeaker; and if the difference value between the sensitivity of the first loudspeaker sound information and the sensitivity of the second loudspeaker sound information is less than zero, taking the difference value between the first loudspeaker sound information and the second loudspeaker sound information as the calibration parameter of the second loudspeaker. ### Claim 5 (depends on 4) The audio calibration method of claim 4, wherein if the difference value between the sensitivity of the first loudspeaker sound information and the sensitivity of the second loudspeaker sound information is greater than zero, the difference value between the first loudspeaker sound information and the second loudspeaker sound information is inversely converted to a negative value and the negative value is superimposed on the first loudspeaker sound information. ### Claim 6 (depends on 4) The audio calibration method of claim 4, wherein if the difference value between the sensitivity of the first loudspeaker sound information and the sensitivity of the second loudspeaker sound information is less than zero, the difference value between the first loudspeaker sound information and the second loudspeaker sound information is superimposed on the second loudspeaker sound information. ### Claim 7 An audio calibration device, applied to calibrate consistency of a first loudspeaker and a second loudspeaker in a headphone by using an audio calibration method; wherein the audio calibration method is executed by a processor built in the headphone which comprises the first loudspeaker, the second loudspeaker, a first microphone and a second microphone, and the audio calibration method comprises: transmitting an audio calibration signal to the first loudspeaker and the second loudspeaker such that the first loudspeaker and the second loudspeaker generate sound signals, wherein the first loudspeaker and the second loudspeaker are disposed opposite to each other; determining first loudspeaker sound information through a sound signal generated by the first loudspeaker and acquired by the first microphone and a sound signal generated by the first loudspeaker and acquired by the second microphone, wherein the first microphone and the second microphone are disposed opposite to each other; determining second loudspeaker sound information through a sound signal generated by the second loudspeaker and acquired by the first microphone and a sound signal generated by the second loudspeaker and acquired by the second microphone; and determining a calibration parameter of the first loudspeaker or a calibration parameter of the second loudspeaker according to the first loudspeaker sound information and the second loudspeaker sound information, wherein determining the calibration parameter of the first loudspeaker or the calibration parameter of the second loudspeaker according to the first loudspeaker sound information and the second loudspeaker sound information comprises: if a difference value between a sensitivity of the first loudspeaker sound information and a sensitivity of the second loudspeaker sound information is within a preset range, calculating a difference value between the first loudspeaker sound information and the second loudspeaker sound information; and taking the difference value between the first loudspeaker sound information and the second loudspeaker sound information as the calibration parameter of the first loudspeaker or the calibration parameter of the second loudspeaker. ### Claim 8 (depends on 7) The audio calibration device of claim 7, wherein the first loudspeaker sound information is an average value of the sound signal generated by the first loudspeaker and acquired by the first microphone and the sound signal generated by the first loudspeaker and acquired by the second microphone. ### Claim 9 (depends on 7) The audio calibration device of claim 7, wherein the second loudspeaker sound information is an average value of the sound signal generated by the second loudspeaker and acquired by the first microphone and the sound signal generated by the second loudspeaker and acquired by the second microphone. ### Claim 10 (depends on 7) The audio calibration method of claim 7, wherein taking the difference value between the first loudspeaker sound information and the second loudspeaker sound information as the calibration parameter of the first loudspeaker or the calibration parameter of the second loudspeaker comprises: if the difference value between the sensitivity of the first loudspeaker sound information and the sensitivity of the second loudspeaker sound information is greater than zero, taking the difference value between the first loudspeaker sound information and the second loudspeaker sound information as the calibration parameter of the first loudspeaker; and if the difference value between the sensitivity of the first loudspeaker sound information and the sensitivity of the second loudspeaker sound information is less than zero, taking the difference value between the first loudspeaker sound information and the second loudspeaker sound information as the calibration parameter of the second loudspeaker. ### Claim 11 (depends on 10) The audio calibration method of claim 10, wherein if the difference value between the sensitivity of the first loudspeaker sound information and the sensitivity of the second loudspeaker sound information is greater than zero, the difference value between the first loudspeaker sound information and the second loudspeaker sound information is inversely converted to a negative value and the negative value is superimposed on the first loudspeaker sound information. ### Claim 12 (depends on 10) The audio calibration method of claim 10, wherein if the difference value between the sensitivity of the first loudspeaker sound information and the sensitivity of the second loudspeaker sound information is less than zero, the difference value between the first loudspeaker sound information and the second loudspeaker sound information is superimposed on the second loudspeaker sound information.