# US 10,455,338 B2 · Method and apparatus for removing dust in sound outlet hole of loudspeaker and terminal device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,455,338 B2 - Document ID: US10455338B2 - Status: Granted - Kind: B2 - Application number: 15/868,267 - Filed: 2018-01-11 - Published: 2018-09-06 - Granted: 2019-10-22 - Earliest claimed: 2017-03-03 - Assignees: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Applicants: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Inventors: Ling Ouyang - Web page: https://patentgrep.com/patent/US10455338B2 ## CPC - H04R 29/001: {for loudspeakers (H04R29/007 takes precedence)} - B08B 7/026: {Using sound waves} - G06F 3/0484: for the control of specific functions or operations, e.g. selecting or manipulating an object, an image or a displayed text element, setting a parameter value or selecting a range - H04R 3/00: Circuits for transducers (arrangements for producing a reverberation or echo sound G10K15/08; amplifiers H03F) - H04R 3/04: for correcting frequency response - H04R 2400/00: Loudspeakers - 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) - B08B: CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A method and an apparatus for removing dust in a sound outlet hole of a loudspeaker and a terminal device are disclosed. The method includes reading a prestored audio frequency for removing dust; and playing the audio file for removing dust. When the loudspeaker plays the audio file for removing dust, a wind speed in the sound outlet hole is at a maximum. ## Claims ### Claim 1 A method for removing dust in a sound outlet hole of a loudspeaker, comprising: measuring a natural frequency of the loudspeaker, generating an audio file for removing dust according to the natural frequency, and prestoring the audio file for removing dust; reading the prestored audio file for removing dust; and controlling the loudspeaker to play the audio file for removing dust, to generate air flow in the sound outlet hole, wherein when the loudspeaker plays the audio file for removing dust, a wind speed of the air flow in the sound outlet hole is at a maximum; wherein measuring the natural frequency of the loudspeaker, and generating the audio file for removing dust according to the natural frequency comprises: inputting exciting currents having a preset current value and various frequencies to a coil of the loudspeaker, to drive a vibration diaphragm of the loudspeaker to vibrate, wherein the air flow is generated in the sound outlet hole under the vibration of the vibration diaphragm; recording a frequency of a first exciting current as the natural frequency of the loudspeaker, when a vibration amplitude of the vibration diaphragm excited by the first exciting current is at a maximum; and generating the audio file for removing dust according to the first exciting current having the natural frequency. ### Claim 2 (depends on 1) The method for removing dust in the sound outlet hole of the loudspeaker of claim 1, wherein generating the audio file for removing dust according to the first exciting current having the natural frequency comprises: setting a preset playing length for the audio file for removing dust; setting a preset sound intensity for the audio file for removing dust; and generating a mono-audio file for removing dust according to the first exciting current having the natural frequency, the preset playing length, and the preset sound intensity. ### Claim 3 (depends on 1) The method for removing dust in the sound outlet hole of the loudspeaker of claim 1, further comprising the following prior to the action of reading the prestored audio file for removing dust: detecting whether the sound outlet hole of the loudspeaker is blocked; displaying a dust removal interface on a display of a terminal device to acquire a dust removal instruction, when the sound outlet hole of the loudspeaker is blocked, wherein the terminal device comprises the loudspeaker; and performing the action of reading the prestored audio file for removing dust, when the dust removal instruction is acquired. ### Claim 4 (depends on 3) The method for removing dust in the sound outlet hole of the loudspeaker of claim 3, after playing the audio file for removing dust, the method further comprising: detecting whether the sound outlet hole of the loudspeaker is blocked; and prompting a user to repair the loudspeaker when the sound outlet hole remains in a blocked state. ### Claim 5 A non-transitory computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to: measure a natural frequency of a loudspeaker, generate an audio file for removing dust according to the natural frequency, and prestore the audio file for removing dust; read the prestored audio file for removing dust; and control the loudspeaker to play the audio file for removing dust, to generate air flow in a sound outlet hole of the loudspeaker, wherein when the loudspeaker plays the audio file for removing dust, a wind speed of the air flow in the sound outlet hole is at a maximum, wherein the computer program executed by the processor to measure the natural frequency of the loudspeaker and generate the audio file for removing dust according to the natural frequency is executed by the processor to: input exciting currents having a preset current value and various frequencies to a coil of the loudspeaker, to drive a vibration diaphragm of the loudspeaker to vibrate, wherein the air flow is generated in the sound outlet hole under the vibration of the vibration diaphragm; record a frequency of a first exciting current as the natural frequency of the loudspeaker, when a vibration amplitude of the vibration diaphragm excited by the first exciting current is at a maximum; and generate the audio file for removing dust according to the first exciting current having the natural frequency. ### Claim 6 (depends on 5) The non-transitory computer-readable storage medium of claim 5, wherein the computer program executed by the processor to generate the audio file for removing dust according to the first exciting current having the natural frequency is executed by the processor to: set a preset playing length for the audio file for removing dust; set a preset sound intensity for the audio file for removing dust; and generate a mono-audio file for removing dust according to the first exciting current having the natural frequency, the preset playing length, and the preset sound intensity. ### Claim 7 (depends on 5) The non-transitory computer-readable storage medium of claim 5, wherein the computer program executed by the processor further causes the processor to: detect whether the sound outlet hole of the loudspeaker is blocked before reading the prestored audio file for removing dust; display a dust removal interface on a display of a terminal device to request to acquire a dust removal instruction, when the sound outlet hole of the loudspeaker is blocked, wherein the terminal device comprises the loudspeaker; and perform the action of reading the prestored audio file for removing dust, when the dust removal instruction is acquired. ### Claim 8 (depends on 7) The non-transitory computer-readable storage medium of claim 7, wherein the computer program executed by the processor further causes the processor to: detect whether the sound outlet hole of the loudspeaker is blocked, after playing the audio file for removing dust; and prompt a user to repair the loudspeaker when the sound outlet hole remains in a blocked state. ### Claim 9 A terminal device, comprising a housing, a loudspeaker disposed in the housing, a memory disposed in the housing, and a processor disposed in the housing, wherein the memory stores an audio file for removing dust, and the processor is configured to: measure a natural frequency of the loudspeaker, generate an audio file for removing dust according to the natural frequency, and prestore the audio file for removing dust; read the prestored audio file for removing dust; and control the loudspeaker to play the audio file for removing dust, to generate air flow in a sound outlet hole of the loudspeaker; wherein when the loudspeaker plays the audio file for removing dust, a wind speed of the air flow through the sound outlet hole is at a maximum; wherein the processor carrying out the action of measuring the natural frequency of the loudspeaker and generating the audio file for removing dust according to the natural frequency is configured to: input exciting currents having a preset current value and various frequencies to a coil of the loudspeaker, to drive a vibration diaphragm of the loudspeaker to vibrate, wherein the air flow is generated in the sound outlet hole under the vibration of the vibration diaphragm; record a frequency of a first exciting current as the natural frequency of the loudspeaker, when a vibration amplitude of the vibration diaphragm excited by the first exciting current is at a maximum; and generate the audio file for removing dust according to the first exciting current having the natural frequency. ### Claim 10 (depends on 9) The terminal device of claim 9, wherein the processor carrying out the action of generating the audio file for removing dust according to the first exciting current having the natural frequency is configured to: set a preset playing length for the audio file for removing dust; set a preset sound intensity for the audio file for removing dust; and generate a mono-audio file for removing dust according to the first exciting current having the natural frequency, the preset playing length, and the preset sound intensity. ### Claim 11 (depends on 9) The terminal device of claim 9, wherein the processor is further configured to: detect whether the sound outlet hole of the loudspeaker is blocked before reading the prestored audio file for removing dust; display a dust removal interface on a display of the terminal device to request to acquire a dust removal instruction, when the sound outlet hole of the loudspeaker is blocked; and perform the action of reading the prestored audio file for removing dust, when the dust removal instruction is acquired. ### Claim 12 (depends on 11) The terminal device of claim 11, wherein the processor is further configured to: detect whether the sound outlet hole of the loudspeaker is blocked, after playing the audio file for removing dust, and prompt a user to repair the loudspeaker when the sound outlet hole remains in a blocked state.