CN108810742B - Sound box control method and device, readable storage medium and mobile terminal - Google Patents
Sound box control method and device, readable storage medium and mobile terminal Download PDFInfo
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- CN108810742B CN108810742B CN201810865933.5A CN201810865933A CN108810742B CN 108810742 B CN108810742 B CN 108810742B CN 201810865933 A CN201810865933 A CN 201810865933A CN 108810742 B CN108810742 B CN 108810742B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
Abstract
The invention discloses a sound box control method, a device, a readable storage medium and a mobile terminal, wherein the sound box comprises a sound outlet hole and a driving component for adjusting the sound outlet direction of the sound outlet hole, and the method comprises the following steps: acquiring direction information of a user within a preset range; and controlling the driving component to adjust the sound emitting direction of the sound emitting hole so that the sound emitting direction of the sound emitting hole is consistent with the direction corresponding to the direction information. According to the invention, the sound outlet direction of the sound outlet hole on the sound box is adjusted by arranging the driving component, firstly, the direction information of the user in a preset range is obtained, and then the driving component is controlled to adjust the sound outlet direction of the sound outlet hole, so that the sound outlet direction of the sound outlet hole is consistent with the direction corresponding to the direction information of the user, therefore, the user can be always in the sound diffusion direction of the sound box, and the hearing experience of the user is ensured.
Description
Technical Field
The invention relates to the technical field of sound boxes, in particular to a sound box control method, a sound box control device, a readable storage medium and a mobile terminal.
Background
With the progress of science and technology, various electronic products are rapidly developed and widely applied, wherein, a sound box is taken as an important sound electronic product, which is deeply liked by users, and the sound box can play music, so that people can enjoy wonderful music.
At present along with intelligent development, the audio amplifier of various intelligence also obtains using, for example bluetooth speaker, the audio amplifier that has the WIFI function etc. but most intelligent stereo set in the market at present can only fix to a direction diffusion sound after putting it in certain position, if the user just is in the direction of sound diffusion, can obtain better sense of hearing experience, but if the user is not in the direction of sound diffusion, will influence sense of hearing experience.
Disclosure of Invention
Therefore, an embodiment of the invention provides a sound box control method, which solves the problem of poor experience when a user is not in a sound diffusion direction.
According to an embodiment of the present invention, a sound box includes a sound outlet hole and a driving component for adjusting a sound outlet direction of the sound outlet hole, and the method includes:
acquiring direction information of a user within a preset range;
and controlling the driving component to adjust the sound emitting direction of the sound emitting hole so that the sound emitting direction of the sound emitting hole is consistent with the direction corresponding to the direction information.
According to the sound box control method provided by the embodiment of the invention, the sound outlet direction of the sound outlet hole in the sound box is adjusted by arranging the driving component, the direction information of the user in the preset range is firstly obtained, then the driving component is controlled to adjust the sound outlet direction of the sound outlet hole, and the sound outlet direction of the sound outlet hole is consistent with the direction corresponding to the direction information of the user, so that the user can be always in the sound diffusion direction of the sound box, and the hearing experience of the user is ensured.
In addition, the sound box control method according to the above embodiment of the present invention may further have the following additional technical features:
further, in an embodiment of the present invention, the sound box includes an infrared scanning device, and the step of acquiring the direction information of the user within the preset range includes:
judging whether only one user exists in the preset range through the infrared scanning equipment;
and if so, identifying the direction information of the user through the infrared scanning equipment.
Further, in an embodiment of the present invention, the sound box includes an infrared scanning device and a camera, and the step of acquiring the direction information of the user within the preset range includes:
judging whether at least two users exist in the preset range through the infrared scanning equipment;
if yes, identifying the faces of all users in the preset range through the camera device to determine a target user;
and identifying the direction information of the target user through the infrared scanning equipment.
Further, in an embodiment of the present invention, the sound box includes a plurality of microphones, and the step of acquiring the direction information of the user within the preset range includes:
receiving a voice instruction sent by a user through the microphone within the preset range;
determining the position of a sound source according to the time difference of the voice command received by the microphone and the arrangement information of the microphone;
and determining the direction information of the user according to the sound source position.
Further, in one embodiment of the present invention, the method further comprises:
acquiring direction information of a user in a preset range, and calculating the distance between the sound box and the user;
and controlling the driving component to adjust the sound emitting direction of the sound emitting hole so as to enable the sound emitting direction of the sound emitting hole to be consistent with the direction corresponding to the direction information, and correspondingly adjusting the control parameters of the sound box according to the distance.
Further, in an embodiment of the present invention, the sound box includes an infrared scanning device, and the step of calculating the distance between the sound box and the user includes:
and calculating the distance between the sound box and the user through the infrared scanning equipment.
Further, in an embodiment of the present invention, the speaker includes a plurality of microphones, and the step of calculating the distance between the speaker and the user includes:
receiving a voice instruction sent by a user through the microphone within the preset range;
and calculating the distance between the sound box and the user according to the time difference of the voice instructions received by the microphone and the arrangement information of the microphone.
Further, in one embodiment of the present invention, the control parameters include at least one of loudness, sound effects, and channels.
Another embodiment of the present invention provides a speaker control device, which solves the problem of poor experience when a user is not in a direction of sound diffusion.
According to the sound box control device of the embodiment of the invention, the sound box comprises a sound outlet hole and a driving component for adjusting the sound outlet direction of the sound outlet hole, and the device comprises:
the acquisition module is used for acquiring the direction information of the user within a preset range;
and the control module is used for controlling the driving component to adjust the sound emitting direction of the sound emitting hole so as to enable the sound emitting direction of the sound emitting hole to be consistent with the direction corresponding to the direction information.
According to the sound box control device provided by the embodiment of the invention, the sound outlet direction of the sound outlet hole in the sound box is adjusted by arranging the driving component, the direction information of the user in the preset range is firstly obtained by the obtaining module, then the control module controls the driving component to adjust the sound outlet direction of the sound outlet hole, and the sound outlet direction of the sound outlet hole is consistent with the direction corresponding to the direction information of the user, so that the user can be always in the sound diffusion direction of the sound box, and the hearing experience of the user is ensured.
Another embodiment of the invention also proposes a readable storage medium on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method.
Another embodiment of the present invention further provides a mobile terminal, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and further includes a sound output hole and a driving component for adjusting a sound output direction of the sound output hole, where the processor implements the above method when executing the program.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of embodiments of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a sound box control method according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a speaker;
FIG. 3 is a flowchart of a loudspeaker control method according to a second embodiment of the invention;
fig. 4 is a schematic structural diagram of a sound box control device according to a third embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a sound box control device according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a sound box control method according to a first embodiment of the present invention includes a sound outlet and a driving component for adjusting a sound outlet direction of the sound outlet, and the method includes:
s101, obtaining direction information of a user in a preset range;
referring to fig. 2, the driving assembly at least includes a driving portion 11 and an actuating portion 12, and the actuating portion 12 can adjust the direction of the sound outlet 131 of the sound box 13 under the driving of the driving portion 11. During specific implementation, the driving portion 11 may adopt a motor, the actuating portion 12 is, for example, a chassis that can rotate, an output shaft 111 of the motor is connected with the chassis, the chassis is driven by the motor to rotate, the sound box 13 may be fixedly connected with the chassis, or a groove 121 for limiting and accommodating the sound box 13 is disposed on the chassis, and during use, the sound box 13 may be directly placed in the groove 121. In addition, in order to realize the determination of the adjustment direction of the sound outlet hole, an angle sensor and a control chip can be further arranged, the position of the sound box is used as the center, the initial angle position of the sound outlet hole in the three-dimensional coordinate system is preset in the three-dimensional coordinate system, and when the chassis drives the sound box to rotate, the rotating angle is recorded through the angle sensor, so that the sound outlet direction of the sound outlet hole can be obtained.
The obtaining of the direction information of the user within the preset range can be realized at least in the following two ways:
the method includes the steps that firstly, the sound box comprises an infrared scanning device, the direction information of a user in a preset range is obtained through the infrared scanning device, specifically, a three-dimensional coordinate system can be established in the preset range (for example, 2m) by taking the position of the sound box as a center, whether a person exists in the preset range (for example, 2m) is scanned through the infrared scanning device, and then the direction information of the user in the three-dimensional coordinate system is obtained after the person exists in the preset range is scanned.
Since, in the implementation, there may be one or more users within the preset range, the implementation is specifically performed by:
judging whether only one user exists in the preset range through the infrared scanning equipment;
and if so, identifying the direction information of the user through the infrared scanning equipment.
And aiming at the condition that at least two users exist in the preset range, the sound box can comprise an infrared scanning device and a camera device,
firstly, judging whether at least two users exist in the preset range through the infrared scanning equipment;
if yes, identifying the faces of all users in the preset range through the camera device to determine a target user;
and identifying the direction information of the target user through the infrared scanning equipment.
The method comprises the steps of storing face information of a target user in advance, controlling a sound box only when a camera device identifies that the face information of the target user exists in a preset range, locking the target user through the camera device, and identifying direction information of the target user through infrared scanning equipment.
And secondly, acquiring direction information of a user within a preset range, wherein the sound box comprises a plurality of microphones, the number of the microphones is at least two, and the microphones can be arranged in an array mode.
Firstly, receiving a voice instruction sent by a user through the microphone within a preset range, wherein the voice instruction is started, for example, and can be realized by adopting a voice recognition technology;
determining the position of a sound source according to the time difference of the voice instructions received by the microphones and the arrangement information of the microphones, or determining the position of the sound source by adopting a three-dimensional sound source positioning method of a four-microphone array, or adopting a distributed double-microphone linear array sound source positioning method;
and determining the direction information of the user according to the sound source position, wherein the user direction information in a three-dimensional coordinate system with the sound box as the center is determined according to the sound source position.
S102, controlling the driving component to adjust the sound emitting direction of the sound emitting hole so that the sound emitting direction of the sound emitting hole is consistent with the direction corresponding to the direction information.
After the user direction information in the three-dimensional coordinate system taking the sound box as the center is determined, the chassis can be driven to rotate through the driving part, the direction of the sound outlet hole in the sound box is adjusted, and the rotating angle of the chassis can be controlled specifically by combining the user direction information in the three-dimensional coordinate system and the initial angle position of the sound outlet hole, so that the sound outlet direction of the sound outlet hole is consistent with the direction corresponding to the user direction information.
In summary, according to the sound box control method of the embodiment, the driving component is arranged to adjust the sound emitting direction of the sound emitting hole on the sound box, the direction information of the user in the preset range is firstly obtained, and then the driving component is controlled to adjust the sound emitting direction of the sound emitting hole, so that the sound emitting direction of the sound emitting hole is consistent with the direction corresponding to the direction information of the user, and therefore, the user can be always in the sound diffusion direction of the sound box, and the hearing experience of the user is ensured.
Referring to fig. 3, a sound box control method according to a second embodiment of the present invention includes a sound outlet and a driving component for adjusting a sound outlet direction of the sound outlet, and the method includes:
s201, obtaining direction information of a user in a preset range, and calculating the distance between the sound box and the user;
in this embodiment, when obtaining the direction information of the user within the preset range, the distance between the speaker and the user is also calculated at the same time, and in the specific implementation, the distance between the speaker and the user may be calculated at least in the following two ways:
the first method comprises the following steps:
the sound box comprises an infrared scanning device, the distance between the sound box and the user is calculated through the infrared scanning device, and specifically, the distance between the sound box and the user can be calculated through reflection of infrared light.
And the second method comprises the following steps:
the sound box comprises a plurality of microphones, the number of the microphones is at least two, the microphones can be arranged in an array mode, and voice instructions sent by a user are received through the microphones within a preset range;
and calculating the distance between the sound box and the user according to the time difference of the voice instructions received by the microphones and the arrangement information of the microphones, and also calculating the distance between the sound box and the sound source by a three-dimensional sound source positioning method of a four-microphone array or by adopting a distributed double-microphone linear array sound source positioning method.
S202, controlling the driving component to adjust the sound emitting direction of the sound emitting hole so that the sound emitting direction of the sound emitting hole is consistent with the direction corresponding to the direction information, and correspondingly adjusting the control parameters of the sound box according to the distance.
Wherein the control parameter comprises at least one of loudness, sound effect and sound channel. The specific control regulation rule can be set according to the requirements of the user. Taking the control parameter as loudness for example, the following description determines in advance a corresponding relationship between a loudness range comfortable for a user and a distance, for example, a sound source distance is 0.1 to 1m, and the corresponding loudness range is 60 to 70 decibels; the sound source distance is 1.1-2 m, and the corresponding loudness range is 71-85 decibels; the sound source distance is 2.1-2.5 m, and the corresponding loudness range is 86-90 decibels. After the sound source distance is calculated, the loudness of the sound box can be correspondingly adjusted. In the same way, other control parameters of the sound box can be adjusted, or a plurality of control parameters can be adjusted simultaneously.
This embodiment is on the basis of first embodiment, except that the direction that the play sound direction that can make go out the sound hole is unanimous with user's direction information correspondence, can also correspond the regulation according to the sound source distance to the control parameter of audio amplifier, for example when the sound source distance is great, when the user is far away from the audio amplifier, can turn up the volume, on the contrary, when the sound source distance is less, can turn down the volume, thereby make the user obtain the best sense of hearing experience, and the user need not to reuse the controller of cell-phone class etc. and the audio amplifier control is more convenient.
It should be noted that the present embodiment focuses on differences from the previous embodiment, and the same and similar parts between the embodiments are not described repeatedly, and may be referred to each other.
Referring to fig. 4, based on the same inventive concept, a sound box control device according to a third embodiment of the present invention includes a sound outlet and a driving component for adjusting a sound outlet direction of the sound outlet, and the device includes:
the acquisition module 11 is configured to acquire direction information of a user within a preset range;
and the control module 12 is configured to control the driving component to adjust the sound emitting direction of the sound emitting hole, so that the sound emitting direction of the sound emitting hole is consistent with the direction corresponding to the direction information.
In this embodiment, the sound box may further include an infrared scanning device, and the obtaining module 11 is specifically configured to:
judging whether only one user exists in the preset range through the infrared scanning equipment;
and if so, identifying the direction information of the user through the infrared scanning equipment.
In this embodiment, the sound box may further include an infrared scanning device and a camera, and the obtaining module 11 may further be configured to:
judging whether at least two users exist in the preset range through the infrared scanning equipment;
if yes, identifying the faces of all users in the preset range through the camera device to determine a target user;
and identifying the direction information of the target user through the infrared scanning equipment.
In this embodiment, the sound box may further include a plurality of microphones, and the obtaining module 11 may further be configured to:
receiving a voice instruction sent by a user through the microphone within the preset range;
determining the position of a sound source according to the time difference of the voice command received by the microphone and the arrangement information of the microphone;
and determining the direction information of the user according to the sound source position.
The audio amplifier controlling means that this embodiment provided, through setting up the play sound direction that goes out the sound hole on the drive assembly adjustment audio amplifier, at first acquire the module and acquire the direction information of presetting the within range user, then the play sound direction of control module control drive assembly adjustment play sound hole makes the play sound direction that goes out the sound hole unanimous with the direction information that user corresponds, consequently, can make the user be in the direction of audio amplifier sound diffusion all the time, guarantees user's sense of hearing and experiences.
Referring to fig. 5, based on the same inventive concept, a sound box control device according to a fourth embodiment of the present invention includes a sound outlet and a driving component for adjusting a sound outlet direction of the sound outlet, and the device includes:
the acquisition and calculation module 21 is configured to acquire direction information of a user within a preset range, and calculate a distance between the sound box and the user;
and the control adjusting module 22 is configured to control the driving component to adjust the sound emitting direction of the sound emitting hole, so that the sound emitting direction of the sound emitting hole is consistent with the direction corresponding to the direction information, and correspondingly adjust the control parameter of the sound box according to the distance.
In this embodiment, the sound box may further include an infrared scanning device, and the obtaining and calculating module 21 is specifically configured to:
and calculating the distance between the sound box and the user through the infrared scanning equipment.
In this embodiment, the sound box may further include a plurality of microphones, and the obtaining and calculating module 21 may further be configured to:
receiving a voice instruction sent by a user through the microphone within the preset range;
and calculating the distance between the sound box and the user according to the time difference of the voice instructions received by the microphone and the arrangement information of the microphone.
In this embodiment, the control parameter includes at least one of loudness, sound effect, and channel.
The technical features and technical effects of the sound box control device provided in this embodiment are the same as those of the method provided in the second embodiment of the present invention, and are not described herein again.
Furthermore, an embodiment of the present invention also proposes a readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the above-mentioned method.
In addition, the embodiment of the present invention further provides a mobile terminal, which includes a memory, a processor, and a computer program that is stored in the memory and can be run on the processor, and further includes a sound output hole and a driving component for adjusting a sound output direction of the sound output hole, where the processor implements the above method when executing the program.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (4)
1. A sound box control method is characterized in that a sound box comprises a sound outlet hole, a driving assembly used for adjusting the sound outlet direction of the sound outlet hole, an infrared scanning device, a plurality of microphones and a camera device, wherein the driving assembly comprises a motor and a chassis connected with an output shaft of the motor, the output shaft is perpendicular to the chassis, the sound box is arranged on the chassis, and the method comprises the following steps:
judging whether at least two users exist in a preset range through the infrared scanning equipment;
if yes, identifying the faces of all users in the preset range through the camera device to determine a target user;
recognizing direction information of the target user through the infrared scanning equipment and receiving a voice instruction sent by the target user through the microphone within the preset range;
calculating the distance between the sound box and the target user according to the time difference of the voice instructions received by the microphone and the arrangement information of the microphone;
controlling the motor to drive the chassis to rotate, further driving the sound box to rotate by the chassis so as to adjust the sound outlet direction of the sound outlet hole, enabling the sound outlet direction of the sound outlet hole to be consistent with the direction corresponding to the direction information, and correspondingly adjusting the control parameters of the sound box according to the distance; wherein the control parameters comprise at least one of loudness, sound effect and sound channels.
2. The utility model provides a sound box controlling means, its characterized in that, the audio amplifier includes a sound hole, is used for the adjustment go out the sound hole and go out drive assembly, infrared scanning equipment, a plurality of microphone and the camera device of sound direction, wherein, drive assembly include the motor and with the chassis of the output shaft of motor, the output shaft with the chassis is perpendicular, the audio amplifier set up in on the chassis, the device includes:
the acquisition module is used for judging whether at least two users exist in a preset range through the infrared scanning equipment; if yes, identifying the faces of all users in the preset range through the camera device to determine a target user; recognizing direction information of the target user through the infrared scanning equipment and receiving a voice instruction sent by the target user through the microphone within the preset range; calculating the distance between the sound box and the target user according to the time difference of the voice instructions received by the microphone and the arrangement information of the microphone;
the control module is used for controlling the motor to drive the chassis to rotate, the chassis further drives the sound box to rotate so as to adjust the sound output direction of the sound output hole, so that the sound output direction of the sound output hole is consistent with the direction corresponding to the direction information, and the control parameters of the sound box are correspondingly adjusted according to the distance; wherein the control parameters comprise at least one of loudness, sound effect and sound channels.
3. A readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method of claim 1.
4. A mobile terminal comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized by further comprising a sound outlet, a driving component for adjusting the sound outlet direction of the sound outlet, the processor implementing the method according to claim 1 when executing the program.
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| CN109640221B (en) * | 2019-01-18 | 2021-01-12 | 云谷（固安）科技有限公司 | Intelligent sound box and control method thereof |
| CN110671801A (en) * | 2019-05-08 | 2020-01-10 | 青岛海尔空调器有限总公司 | Method and device for controlling air outlet direction and sound outlet direction and air conditioner |
| CN112104928A (en) * | 2020-05-13 | 2020-12-18 | 苏州触达信息技术有限公司 | Intelligent sound box and method and system for controlling intelligent sound box |
| CN113630693B (en) * | 2021-08-31 | 2023-05-12 | 安徽井利电子有限公司 | External sound surrounding type somatosensory loudspeaker |
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| CN108810742A (en) | 2018-11-13 |
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