CN112312257A - Intelligent 3D earphone of making an uproar falls in initiative digit - Google Patents
Intelligent 3D earphone of making an uproar falls in initiative digit Download PDFInfo
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- CN112312257A CN112312257A CN202010933465.8A CN202010933465A CN112312257A CN 112312257 A CN112312257 A CN 112312257A CN 202010933465 A CN202010933465 A CN 202010933465A CN 112312257 A CN112312257 A CN 112312257A
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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
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- 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
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
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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
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
Abstract
The application relates to the technical field of audio, in particular to an active digital noise reduction intelligent 3D earphone which comprises a noise reduction chip, wherein the noise reduction chip is provided with an acquisition unit, a first determination unit, a second determination unit, a third determination unit and a noise reduction unit, and the second determination unit is used for determining a signal-to-noise ratio in a current scene according to the signal intensity of the current audio and the noise intensity; the noise reduction chip also comprises a processing unit, wherein the processing unit is internally provided with an instruction for generating a stereo digital signal transmitted to the loudspeaker; the noise reduction chip is arranged in the rear shell and is electrically connected with the horn; the inner bottom surface of the rear shell is a concave surface. The active digital noise reduction intelligent 3D earphone can perform self-adaptive noise reduction processing based on different environments, has high noise reduction accuracy and wide frequency response range, and can ensure the sensitivity of an earphone loudspeaker.
Description
Technical Field
The application relates to the technical field of audio frequency, in particular to an intelligent 3D earphone with active digital noise reduction.
Background
In many noise reduction scenarios, noise reduction is divided into active noise reduction and passive noise reduction. The active noise reduction function is to generate reverse sound waves equal to external noise through a noise reduction system to neutralize the noise, so that the noise reduction effect is realized. The passive noise reduction earphone mainly forms a closed space by surrounding ears, or adopts sound insulation materials such as silica gel earplugs and the like to block outside noise. However, both active noise reduction and passive noise reduction are easily affected by the external environment, and thus a better noise reduction effect cannot be achieved, and meanwhile, the conventional earphone acoustic structure easily causes the frequency response range to be reduced, so that the sensitivity of the earphone is reduced, and particularly, the problems are obvious in the earphone with virtual surround sound effect.
Disclosure of Invention
The embodiment of the application provides an intelligent 3D earphone of making an uproar falls in initiative digit, and then can fall to make an uproar to the external scene of difference at least to a certain extent, improves the effect of making an uproar.
Other features and advantages of the present application will be apparent from the following detailed description, or may be learned by practice of the application.
According to an aspect of an embodiment of the present application, an active digital noise reduction intelligent 3D headphone is provided, which includes a noise reduction chip, where the noise reduction chip is provided with an obtaining unit, a first determining unit, a second determining unit, a third determining unit, and a noise reduction unit; the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring noise in a current scene; the first determining unit is used for determining the noise intensity of the noise according to the information of the noise; the second determining unit is used for determining the signal-to-noise ratio in the current scene according to the signal intensity of the current audio and the noise intensity; a third determining unit for determining a noise reduction level based on the signal-to-noise ratio; the noise reduction unit is used for carrying out noise reduction processing based on a noise reduction mode corresponding to the noise reduction grade;
the loudspeaker box comprises a front shell, a loudspeaker and a rear shell, wherein the front shell is provided with a middle cavity, a pore passage and a leakage hole, a resonance damping loudspeaker box for mounting the loudspeaker is arranged in the middle cavity, one end of the leakage hole is communicated with the front cavity, the other end of the leakage hole is communicated with the outside, one end of the pore passage is communicated with the waist of the leakage hole, and one end of the pore passage is communicated with a space in the resonance damping loudspeaker box; the resonance damping horn box comprises a main box body and a box cover, wherein the box cover is embedded in the opening end of the main box body, the bottom of the main box body is provided with a via hole, and the via hole conducts the front cavity and the interior of the main box body; the rear shell is provided with a rear cavity, and the box cover is positioned in the rear cavity; the noise reduction chip also comprises a processing unit, and the processing unit is internally provided with instructions for generating a stereo digital signal transmitted to a loudspeaker; the noise reduction chip is arranged in the rear shell and is electrically connected with the horn; the inner bottom surface of the rear shell is a concave surface.
According to one aspect of the embodiment of the application, the noise reduction method used in the noise reduction mode of the active digital noise reduction intelligent 3D earphone comprises the following steps:
acquiring noise in a current scene;
determining the noise intensity of the noise according to the information of the noise;
determining the signal-to-noise ratio in the current scene according to the signal intensity of the current audio and the noise intensity;
determining a noise reduction level based on the signal-to-noise ratio;
performing noise reduction processing based on a noise reduction mode corresponding to the noise reduction grade;
the noise comprises a first noise and a second noise which are acquired by two channels;
determining the noise intensity of the noise according to the information of the noise, comprising:
determining the noise intensity spectrum according to the noise sound pressure spectrum of the first noise, the noise sound pressure spectrum of the second noise and the phase difference between the first noise and the second noise;
and determining the noise intensity of the noise according to the noise intensity spectrum and a preset noise intensity parameter.
According to an aspect of an embodiment of the present application, in an active digital noise reduction smart 3D headphone according to the present invention, the noise intensity spectrum is determined according to a noise sound pressure spectrum of the first noise, a noise sound pressure spectrum of the second noise, and a phase difference between the first noise and the second noise, and is:
wherein k represents the time of the noise intensity spectrum; da(k) A noise sound pressure spectrum representing the first noise; db(k) A noise sound pressure spectrum representing the second noise; Δ φ (k) represents a phase difference between the first noise and the second noise;
according to the noise intensity spectrumAnd a preset noise intensity parameter, determining the noise intensity of the noise as: sN(k)＝CkDk；
Wherein, CkRepresenting the noise strength parameter.
According to an aspect of the embodiments of the present application, an active digital noise reduction intelligent 3D headphone of the present invention determines a signal-to-noise ratio in a current scene according to a signal strength of a current audio and the noise strength, including:
wherein N represents a time length corresponding to the audio; s (k) represents the signal strength of the current audio.
According to an aspect of the embodiment of the present application, the active digital noise reduction intelligent 3D headphone of the present invention obtains noise in a current scene, including:
sampling sound in a current scene to obtain noise in the current scene;
determining a noise reduction grade corresponding to a signal-to-noise ratio according to a corresponding relation between a preset signal-to-noise ratio and the noise reduction grade;
determining a noise reduction mode corresponding to the noise reduction grade according to a corresponding relation between preset noise reduction equal and the noise reduction mode;
and performing noise reduction processing on the current audio based on the noise reduction mode.
According to one aspect of the embodiment of the application, the mass of the resonance damping horn box is 1.3-1.4 times of that of the front shell.
According to one aspect of the embodiment of the application, the active digital noise reduction intelligent 3D earphone is characterized in that the main box body is provided with a support through hole, the support through hole penetrates through a flat pressing pipe body, one end of the flat pressing pipe body is located inside the main box body, and the other end of the flat pressing pipe body is inserted into the hole and communicated with the hole.
According to one aspect of the embodiment of the application, at least two support through holes are arranged at equal intervals along the circumferential direction of the main box body, at least two flat pressing pipe bodies are arranged, and the resonance damping horn box is connected with the front shell in a suspension mode through the at least two flat pressing pipe bodies.
According to one aspect of the embodiment of the application, the curvature radius of the concave surface is 5-17 times of the distance between the flat pressing pipe body and the leakage hole.
According to an aspect of the embodiments of the present application, in an active digital noise reduction smart 3D earphone according to the present invention, a ratio of a mass of the resonance damping horn box to a mass of the front shell is equal to a ratio of a sound velocity of the resonance damping horn box to a sound velocity of the front shell.
In the technical solutions provided in some embodiments of the present application, noise in a current scene is obtained; determining the noise intensity of the noise according to the information of the noise; determining the signal-to-noise ratio in the current scene according to the signal intensity and the noise intensity of the current audio; determining a noise reduction level based on the signal-to-noise ratio; and performing noise reduction processing based on a noise reduction mode corresponding to the noise reduction level. In the embodiment, the signal-to-noise ratio between the noise and the audio is determined based on the noise condition in the current environment, and then the corresponding noise reduction mode is determined based on the signal-to-noise ratio, so that the self-adaptive noise reduction processing is performed based on different environments, the intelligence and the efficiency of the noise reduction process and the accuracy of the noise reduction effect are improved, and meanwhile, the acoustic structure of the earphone can reduce the reduction degree of the frequency response range and can ensure the sensitivity of the earphone loudspeaker.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 schematically shows a schematic cross-sectional structure diagram of an active digital noise reduction intelligent 3D headset according to the present invention.
Fig. 2 schematically shows a flow chart of a noise reduction method of an active digital noise reduction smart 3D headset according to an embodiment of the present application;
fig. 3 schematically illustrates a block diagram of an active digital noise reduction smart 3D headset according to an embodiment of the present application.
Fig. 4 schematically shows an exploded structure diagram of an active digital noise reduction intelligent 3D headphone according to the present invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
The implementation details of the technical solution of the embodiment of the present application are set forth in detail below:
as shown in fig. 1, 2, and 4, the active digital noise reduction intelligent 3D headphone of the present invention includes a noise reduction chip, where the noise reduction chip is provided with an obtaining unit, a first determining unit, a second determining unit, a third determining unit, and a noise reduction unit; the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring noise in a current scene; the first determining unit is used for determining the noise intensity of the noise according to the information of the noise; the second determining unit is used for determining the signal-to-noise ratio in the current scene according to the signal intensity of the current audio and the noise intensity; a third determining unit for determining a noise reduction level based on the signal-to-noise ratio; the noise reduction unit is used for carrying out noise reduction processing based on a noise reduction mode corresponding to the noise reduction grade; the loudspeaker comprises a front shell 1, a loudspeaker and a rear shell 2, wherein the front shell 1 is provided with a middle cavity 02, a pore canal 11 and a leakage hole 12, a resonance damping loudspeaker box 3 for mounting the loudspeaker is arranged in the middle cavity 02, one end of the leakage hole 12 is communicated with the front cavity 01, the other end of the leakage hole 12 is communicated with the outside, one end of the pore canal 11 is communicated with the waist of the leakage hole 12, and one end of the pore canal 11 is communicated with a space in the resonance damping loudspeaker box 3; the resonance damping horn box 3 comprises a main box body 31 and a box cover 32, wherein the box cover 32 is embedded in the opening end of the main box body 31, the bottom of the main box body 31 is provided with a through hole, and the through hole conducts the front cavity 01 and the interior of the main box body 31; the rear shell 2 is provided with a rear cavity 03, and the box cover 32 is positioned in the rear cavity 03; the noise reduction chip also comprises a processing unit, and the processing unit is internally provided with instructions for generating a stereo digital signal transmitted to a loudspeaker; the noise reduction chip is arranged in the rear shell 2 and is electrically connected with the horn; the inner bottom surface of the rear shell 2 is a concave surface 5.
According to the active digital noise reduction intelligent 3D earphone, the leakage hole 12 and the air pressure in the resonant damping loudspeaker box 3 tend to be in linkage balance, the consistency of the earphone when the earphone is designed and worn by a real person can be improved, the reduction degree of the frequency response range is reduced, and the sensitivity of the earphone loudspeaker can be guaranteed; specifically, the diameter of the leakage hole 12 is 3-6 mm.
Fig. 2 shows a flow chart of a noise reduction method of an active digital noise reduction smart 3D headset according to an embodiment of the application. Referring to fig. 2, the active digital noise reduction intelligent 3D headphone at least includes steps S110 to S150, which are described in detail as follows:
in step S110, noise in the current scene is acquired.
In one embodiment of the present application, the manner of acquiring the noise in the current scene may be a real-time acquisition manner, for example, acquiring a segment of noise data.
In an embodiment of the present application, the sound in the current scene may also be sampled to obtain sampled data, which is used as the noise in the current scene. In this embodiment, noise is obtained by sampling to reduce the data amount of noise processing, improve the efficiency of audio noise reduction, and achieve the effect of high-speed audio noise reduction.
In step S120, the noise intensity of the noise is determined based on the information of the noise.
In one embodiment of the present application, the information of the noise includes information such as volume, intensity, or sound pressure of the noise, and other types of sound information may be included. In the present embodiment, information such as the volume and intensity of noise may be used as the noise intensity of noise.
In an embodiment of the present application, the noise includes two channels to obtain a first noise and a second noise; the process of determining the noise intensity of the noise according to the information of the noise in step S120 includes the following steps:
determining a noise intensity spectrum according to the noise sound pressure spectrum of the first noise, the noise sound pressure spectrum of the second noise and the phase difference between the first noise and the second noise;
and determining the noise intensity of the noise according to the noise intensity spectrum and a preset noise intensity parameter.
Specifically, in this embodiment, the noise intensity spectrum is determined according to the noise sound pressure spectrum of the first noise, the noise sound pressure spectrum of the second noise, and the phase difference between the first noise and the second noise, and is:
wherein k represents the time of the noise intensity spectrum; da(k) A noise sound pressure spectrum representing the first noise; db(k) A noise sound pressure spectrum representing the second noise; Δ Φ (k) represents a phase difference between the first noise and the second noise;
according to the noise intensity spectrum and a preset noise intensity parameter, determining the noise intensity of the noise as follows: sN(k)＝CkDk；
Wherein, CkRepresenting a noise strength parameter.
In step S130, a signal-to-noise ratio in the current scene is determined according to the signal strength and the noise strength of the current audio.
In an embodiment of the present application, the signal-to-noise ratio is used to represent a ratio between a signal intensity of an audio and a noise intensity of a noise, so as to measure the ratio between the audio and the noise in the current environment through the signal-to-noise ratio, and to ensure the playing effect of the audio by using a low-level noise reduction method under the condition of a low signal-to-noise ratio; under the condition of high signal-to-noise ratio, a high-level noise reduction method is adopted to reduce the influence of noise on audio playing, so that the corresponding noise reduction method is adopted for different environment states, and a balanced noise reduction effect is achieved.
In one embodiment of the present application, determining a signal-to-noise ratio in a current scene according to a signal strength and a noise strength of a current audio includes:
wherein, N represents the time length corresponding to the audio; s (k) represents the signal strength of the current audio.
In addition, the noise reduction principle is the same for the continuous audio signal and the noise signal, and the details are not repeated here.
In step S140, a noise reduction level is determined based on the signal-to-noise ratio.
In an embodiment of the present application, a correspondence is preset for the signal-to-noise ratio and the noise reduction level, so as to determine the noise reduction level corresponding to the signal-to-noise ratio based on the correspondence between the signal-to-noise ratio and the noise reduction level.
For example, the corresponding noise reduction level is determined according to the threshold range corresponding to the signal-to-noise ratio through the threshold range corresponding to each noise reduction level. For example, the noise reduction levels may include a primary noise reduction level, a secondary noise reduction level, a tertiary noise reduction level, and the like, where a signal-to-noise ratio corresponding to the primary noise reduction level is 0.8 to 1.0, a signal-to-noise ratio corresponding to the secondary noise reduction level is 0.6 to 0.8, and a signal-to-noise ratio corresponding to the tertiary noise reduction level is less than 0.6. And when the calculated signal-to-noise ratio is 0.5, determining that the corresponding noise reduction level is a three-level noise reduction level, which shows that the intensity of the current noise is higher than that of the audio.
In step S150, noise reduction processing is performed based on the noise reduction method corresponding to the noise reduction level.
In one embodiment of the application, a noise reduction mode corresponding to a noise reduction level is determined according to a preset corresponding relationship between noise reduction equals and the noise reduction mode; and performing noise reduction processing on the current audio in a noise reduction-based mode. Specifically, in this embodiment, different noise reduction levels correspond to noise reduction modes with different strengths, for example, the noise reduction strength corresponding to the three-level noise reduction level is higher than the noise reduction strength corresponding to the two-level noise reduction level.
In an embodiment of the present application, when the calculated signal-to-noise ratio is 0.5, it is determined that the corresponding noise reduction level is a three-level noise reduction level, and then noise reduction processing is performed based on a noise reduction mode corresponding to the three-level noise reduction level.
The following describes embodiments of the apparatus of the present application, which may be used to implement an active digital noise reduction smart 3D headphone in the above embodiments of the present application. For details not disclosed in the embodiments of the apparatus of the present application, please refer to the embodiments of the active digital noise reduction smart 3D earphone described above in the present application.
Fig. 3 shows a block diagram of an active digital noise reduction smart 3D headset according to an embodiment of the application.
Referring to fig. 3, an active digital noise reduction smart 3D headset 200 according to an embodiment of the present application includes:
an obtaining unit 210, configured to obtain noise in a current scene; a first determining unit 220, configured to determine a noise strength of the noise according to the information of the noise; a second determining unit 230, configured to determine a signal-to-noise ratio in the current scene according to the signal strength and the noise strength of the current audio; a third determining unit 240 for determining a noise reduction level based on the signal-to-noise ratio; the denoising unit 250 performs denoising processing based on a denoising method corresponding to the denoising level.
In some embodiments of the present application, based on the foregoing scheme, the noise includes that two channels acquire the first noise and the second noise; the first determination unit 220 includes: a fourth determination unit configured to determine a noise intensity spectrum from the noise sound pressure spectrum of the first noise, the noise sound pressure spectrum of the second noise, and a phase difference between the first noise and the second noise; and the fifth determining unit is used for determining the noise intensity of the noise according to the noise intensity spectrum and a preset noise intensity parameter.
In some embodiments of the present application, based on the foregoing scheme, the noise intensity spectrum is determined according to the noise sound pressure spectrum of the first noise, the noise sound pressure spectrum of the second noise, and the phase difference between the first noise and the second noise as follows:
wherein k represents the time of the noise intensity spectrum; da(k) A noise sound pressure spectrum representing the first noise; db(k) A noise sound pressure spectrum representing the second noise; Δ Φ (k) represents a phase difference between the first noise and the second noise;
according to the noise intensity spectrum and the preset noise intensity parameterDetermining the noise intensity of the noise as follows: sN(k)＝CkDk；
Wherein, CkRepresenting a noise strength parameter.
In some embodiments of the present application, based on the foregoing scheme, the second determining unit 230 includes:
wherein, N represents the time length corresponding to the audio; s (k) represents the signal strength of the current audio.
In some embodiments of the present application, based on the foregoing scheme, the obtaining unit 210 is configured to sample sound in the current scene, so as to obtain noise in the current scene.
In some embodiments of the present application, based on the foregoing scheme, the third determining unit 240 is configured to: and determining the noise reduction grade corresponding to the signal-to-noise ratio according to the corresponding relation between the preset signal-to-noise ratio and the noise reduction grade.
In some embodiments of the present application, based on the foregoing scheme, the noise reduction unit 250 is configured to: determining a noise reduction mode corresponding to the noise reduction grade according to the corresponding relation between the preset noise reduction equal and the noise reduction mode; and based on the noise reduction mode, carrying out noise reduction processing on the current audio.
According to one aspect of the embodiment of the application, the mass of the resonance damping horn box 3 is 1.3-1.4 times of the mass of the front shell 1, so that the resonance damping horn box 3 does not resonate with the front shell 1 synchronously;
according to an aspect of the embodiment of the application, the active digital noise reduction intelligent 3D earphone is provided, the main box body 31 is provided with a support through hole 33, the support through hole 33 penetrates through the flat pressing pipe body 4, one end of the flat pressing pipe body 4 is located inside the main box body 31, and the other end of the flat pressing pipe body 4 is inserted into the hole 11 and is communicated with the hole 11.
According to an aspect of the embodiment of the application, the active digital noise reduction intelligent 3D earphone comprises at least two support through holes 33 arranged at equal intervals along the circumferential direction of the main box body 31, at least two flat pressing pipe bodies 4 arranged, and the resonance damping horn box 3 connected with the front shell 1 in a suspension mounting manner through the at least two flat pressing pipe bodies 4. Resonance damping loudspeaker box 3 passes through concora crush body 4 and preceding 1 suspension erection joint of shell reduce with preceding 1 contact of shell to during the loudspeaker wind sound, resonance damping loudspeaker box 3 can take place incoherent and continuous asynchronous resonance with preceding shell 1, be convenient for take into account resonance damping loudspeaker box 3 and preceding 1 respective resonance attribute of shell when analytic sound digital signal, utilize the software program to eliminate or reduce the resonance of resonance damping loudspeaker box 3 and preceding shell 1 to the influence of frequency response scope.
According to one aspect of the embodiment of the application, the curvature radius of the concave surface 5 is 5-17 times of the distance between the flat pressing pipe body 4 and the leakage hole 12, and the specific sound wave reflection focus of the concave surface 5 is located between the flat pressing pipe body 4 and the leakage hole 12, so that sound waves emitted by a loudspeaker are superposed with sound waves directly emitted by the loudspeaker in a sound pressure balanced space after being reflected by the concave surface 5, and the wider frequency response range of the earphone is further maintained under a 3D virtual surrounding sound effect.
According to an aspect of the embodiment of the application, in the active digital noise reduction intelligent 3D earphone, the ratio of the mass of the resonance damping horn box 3 to the mass of the front shell 1 is equal to the ratio of the sound velocity of the resonance damping horn box to the sound velocity of the front shell 1, so that the association of the resonance damping horn box 3 and the front shell 1 which can resonate is further reduced.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. Each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described in the embodiments of the present application may be implemented by software, or may be implemented by hardware, and the described units may also be disposed in a processor. Wherein the names of the elements do not in some way constitute a limitation on the elements themselves.
It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the application. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiments of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the embodiments of the present application.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (9)
1. An active digital noise reduction intelligent 3D earphone is characterized by comprising a noise reduction chip, wherein the noise reduction chip is provided with an acquisition unit, a first determination unit, a second determination unit, a third determination unit and a noise reduction unit; the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring noise in a current scene; the first determining unit is used for determining the noise intensity of the noise according to the information of the noise; the second determining unit is used for determining the signal-to-noise ratio in the current scene according to the signal intensity of the current audio and the noise intensity; a third determining unit for determining a noise reduction level based on the signal-to-noise ratio; the noise reduction unit is used for carrying out noise reduction processing based on a noise reduction mode corresponding to the noise reduction grade;
the loudspeaker box comprises a front shell, a loudspeaker and a rear shell, wherein the front shell is provided with a middle cavity, a pore passage and a leakage hole, a resonance damping loudspeaker box for mounting the loudspeaker is arranged in the middle cavity, one end of the leakage hole is communicated with the front cavity, the other end of the leakage hole is communicated with the outside, one end of the pore passage is communicated with the waist of the leakage hole, and one end of the pore passage is communicated with a space in the resonance damping loudspeaker box; the resonance damping horn box comprises a main box body and a box cover, wherein the box cover is embedded in the opening end of the main box body, the bottom of the main box body is provided with a via hole, and the via hole conducts the front cavity and the interior of the main box body; the rear shell is provided with a rear cavity, and the box cover is positioned in the rear cavity;
the noise reduction chip also comprises a processing unit, and the processing unit is internally provided with instructions for generating a stereo digital signal transmitted to a loudspeaker; the noise reduction chip is arranged in the rear shell and is electrically connected with the horn;
the inner bottom surface of the rear shell is a concave surface.
2. The active digital noise reduction intelligent 3D earphone according to claim 1, wherein the noise reduction method used in the noise reduction mode comprises:
acquiring noise in a current scene;
determining the noise intensity of the noise according to the information of the noise;
determining the signal-to-noise ratio in the current scene according to the signal intensity of the current audio and the noise intensity;
determining a noise reduction level based on the signal-to-noise ratio;
performing noise reduction processing based on a noise reduction mode corresponding to the noise reduction grade;
the noise comprises a first noise and a second noise which are acquired by two channels;
determining the noise intensity of the noise according to the information of the noise, comprising:
determining the noise intensity spectrum according to the noise sound pressure spectrum of the first noise, the noise sound pressure spectrum of the second noise and the phase difference between the first noise and the second noise;
and determining the noise intensity of the noise according to the noise intensity spectrum and a preset noise intensity parameter.
3. The active digital noise-reducing intelligent 3D earphone according to claim 2, wherein the noise intensity spectrum is determined according to the noise sound pressure spectrum of the first noise, the noise sound pressure spectrum of the second noise, and the phase difference between the first noise and the second noise as follows:
wherein k represents the time of the noise intensity spectrum; da(k) A noise sound pressure spectrum representing the first noise; db(k) A noise sound pressure spectrum representing the second noise; Δ φ (k) represents a phase difference between the first noise and the second noise;
according to the noise intensity spectrum and a preset noise intensity parameter, determining the noise intensity of the noise as follows: sN(k)＝CkDk；
Wherein, CkRepresenting the noise strength parameter.
4. The active digital noise reduction intelligent 3D earphone according to claim 3, wherein determining the signal-to-noise ratio in the current scene according to the signal strength of the current audio and the noise strength comprises:
wherein N represents a time length corresponding to the audio; s (k) represents the signal strength of the current audio.
5. The active digital noise reduction intelligent 3D headphone of claim 1, characterized in that: the mass of the resonance damping horn box is 1.3-1.4 times of that of the front shell.
6. The active digital noise reduction intelligent 3D headphone of claim 1, characterized in that: the main box body is provided with a supporting through hole, a flat pressing pipe body is arranged in the supporting through hole in a penetrating mode, one end of the flat pressing pipe body is located inside the main box body, and the other end of the flat pressing pipe body is inserted into the hole channel in an inserting mode and is communicated with the hole channel.
7. The active digital noise reduction intelligent 3D headphone of claim 6, characterized in that: the supporting through holes are arranged at equal intervals along the circumferential direction of the main box body, the flat pressing pipe bodies are arranged at least two, and the resonance damping horn box is connected with the front shell in a suspension mode through the flat pressing pipe bodies at least two.
8. The active digital noise reduction intelligent 3D headphone of claim 7, characterized in that: the curvature radius of the concave surface 5 is 5-17 times of the distance between the flat pressing pipe body and the leakage hole.
9. The active digital noise reduction intelligent 3D headphone of claim 1, characterized in that: the ratio of the mass of the resonance damping horn box to the mass of the front shell is equal to the ratio of the sound velocity of the resonance damping horn box to the sound velocity of the front shell.
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