CN112055283A - Active noise reduction module of acoustic-electric sensor and sound monitor - Google Patents
Active noise reduction module of acoustic-electric sensor and sound monitor Download PDFInfo
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- CN112055283A CN112055283A CN202010901200.XA CN202010901200A CN112055283A CN 112055283 A CN112055283 A CN 112055283A CN 202010901200 A CN202010901200 A CN 202010901200A CN 112055283 A CN112055283 A CN 112055283A
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- sound
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- electric sensor
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- 239000000523 sample Substances 0.000 claims abstract description 8
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 5
- 230000002612 cardiopulmonary effect Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
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Classifications
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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
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for microphones
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B7/00—Instruments for auscultation
- A61B7/003—Detecting lung or respiration noise
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B7/00—Instruments for auscultation
- A61B7/02—Stethoscopes
- A61B7/04—Electric stethoscopes
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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
- G10K11/17821—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 characterised by the analysis of the input signals only
-
- 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
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/116—Medical; Dental
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- Health & Medical Sciences (AREA)
- Acoustics & Sound (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Surgery (AREA)
- Veterinary Medicine (AREA)
- Molecular Biology (AREA)
- Heart & Thoracic Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Medical Informatics (AREA)
- Biomedical Technology (AREA)
- Pulmonology (AREA)
- Otolaryngology (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses an active noise reduction module of an acoustic-electric sensor and a sound monitor, wherein the active noise reduction module of the acoustic-electric sensor comprises an acoustic-electric sensor component for picking up target sound, a plurality of external radio devices arranged outside the acoustic-electric sensor component and used for picking up external noise, at least one internal radio device arranged in the acoustic-electric sensor component and used for picking up the sound transmitted into the acoustic-electric sensor component, and a noise reduction component at least partially arranged in the acoustic-electric sensor component and used for reducing the picking up noise of the acoustic-electric sensor component, wherein the noise reduction component is respectively electrically connected with the external radio device and the internal radio device; the sound monitor comprises a probe provided with the active noise reduction module of the acoustoelectric sensor. According to the active noise reduction module of the acoustic-electric sensor and the sound monitor, disclosed by the invention, the influence of external noise on target sound pickup is eliminated through an active noise reduction technology, and the target sound monitoring quality is improved.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to an active noise reduction module of an acoustoelectric sensor and a sound monitor.
Background
The sound-electricity sensor is an energy conversion device for converting a sound signal into an electric signal, and is generally used in a sound monitor to pick up a target sound. In the actual use process of the acoustoelectric sensor, due to the existence of environmental noise, the effect of picking up the target sound is not good, and the subsequent processing operation is troublesome.
Particularly, when the acoustoelectric sensor is used in a cardiopulmonary sound monitor to pick up cardiopulmonary sounds, in the environment with more noises in hospitals, the acoustoelectric sensor can pick up two types of sounds, one type is the noise which reaches the acoustoelectric sensor through a multiple shell, and the other type is the heart sounds and the lung sounds which need to be picked up.
Disclosure of Invention
The invention aims to provide an active noise reduction module of an acoustoelectric sensor and a sound monitor, which eliminate the influence of external noise on target sound pickup through an active noise reduction technology and improve the target sound monitoring quality.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the active noise reduction module of the acoustic-electric sensor is characterized by comprising an acoustic-electric sensor assembly for picking up target sound, a plurality of external sound receiving devices arranged outside the acoustic-electric sensor assembly and used for picking up external noise, at least one internal sound receiving device arranged in the acoustic-electric sensor assembly and used for picking up sound transmitted into the acoustic-electric sensor assembly, and a noise reduction assembly at least partially arranged in the acoustic-electric sensor assembly and used for reducing the picking-up noise of the acoustic-electric sensor assembly, wherein the noise reduction assembly is electrically connected with the external sound receiving devices and the internal sound receiving devices respectively.
Preferably, the noise reduction assembly comprises a sound production device and a digital signal processor which are arranged in the acoustoelectric sensor assembly.
Preferably, the digital signal processor is electrically connected between the external sound receiving device and the sound generating device, the digital signal processor receives external noise picked up by the external sound receiving device, and the system forms equal reverse sound waves to drive the sound generating device.
Preferably, the digital signal processor is further electrically connected between the built-in sound receiving device and the sound generating device, the digital signal processor receives sound which is picked up by the built-in sound receiving device and transmitted into the sound and electricity sensor assembly, residual external noise is calculated, and the system forms equal reverse sound waves to drive the sound generating device.
Preferably, the acoustoelectric sensor assembly comprises a shell, a sealing cover covering the shell to form a sound cavity, and an acoustoelectric transducer arranged in the sound cavity.
Preferably, the external sound receiving device is arranged outside the sound cavity, and the internal sound receiving device and the sound generating device are arranged in the sound cavity.
Preferably, the acoustoelectric sensor assembly further comprises a circuit board which is arranged in the sound cavity and performs signal transmission with the acoustoelectric transducer so as to amplify signals.
The invention also provides a sound monitor which comprises a probe provided with the active noise reduction module of the acoustoelectric sensor.
Preferably, the probe comprises a housing having an opening and a cap covering the opening to form a receiving cavity.
Preferably, the external radio device is arranged outside the shell, and the active noise reduction module of the acoustic-electric sensor except the external radio device is arranged in the accommodating cavity and close to the cap
Compared with the prior art, the invention has the following advantages:
according to the active noise reduction module of the acoustic-electric sensor, an external sound receiving component is arranged outside an acoustic-electric sensor component, an internal sound receiving component and a noise reduction component are arranged in the acoustic-electric sensor component, feed-forward noise reduction is formed by matching the external sound receiving component with the noise reduction component, noise coming in and going out of the acoustic-electric sensor component from the outside is reduced, feedback noise reduction is formed by matching the internal sound component with the noise reduction component, the residual noise in the acoustic-electric sensor component is reduced, when the acoustic-electric sensor component picks up target sound, the influence of the external noise on the picking up of the target sound is actively eliminated, and the picking up quality of the target sound is improved. When the active noise reduction module of the acoustic-electric sensor is installed on a sound monitor, the monitoring quality of target sound can be effectively improved, and subsequent processing operation on picked sound is facilitated.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case. In the drawings:
FIG. 1 is a schematic structural diagram of an active noise reduction module of an electroacoustic transducer according to the present invention;
fig. 2 is a schematic structural diagram of a sound monitor according to the present invention.
Shown in the figure: 1. an acoustic-electric sensor assembly; 11. a housing; 12. a sealing cover; 13. an acoustoelectric transducer; 14. a sound cavity; 15. a circuit board; 2. an external radio device; 3. a radio device is arranged in the radio receiver; 4. a noise reduction assembly; 41. a sound producing device; 42. a digital signal processor; 5. a probe; 51. a housing; 52. capping; 53. a receiving cavity.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example one
As shown in fig. 1, the active noise reduction module for an acoustic-electric sensor according to a preferred embodiment of the present invention includes an acoustic-electric sensor assembly 1 for picking up a target sound, a plurality of external sound receiving devices 2 disposed outside the acoustic-electric sensor assembly 1 for picking up external noise, at least one internal sound receiving device 3 disposed inside the acoustic-electric sensor assembly 1 for picking up sound transmitted into the acoustic-electric sensor assembly 1, and a noise reduction assembly 4 disposed at least partially inside the acoustic-electric sensor assembly 1 for reducing noise picked up by the acoustic-electric sensor assembly 1, where the noise reduction assembly 4 is electrically connected to the external sound receiving device 2 and the internal sound receiving device 3, respectively, receives sound picked up by the external sound receiving device 2 and the internal sound receiving device 3, and performs corresponding noise reduction processing on the external noise in the picked-up sound.
The acoustoelectric sensor assembly 1 includes a housing 11, a sealed cover 12 covering the housing 11 to form a sound cavity 14, an acoustoelectric transducer 13 disposed in the sound cavity 14, and a circuit board 15 disposed in the sound cavity 14 and performing signal transmission with the acoustoelectric transducer 13 to amplify signals.
The noise reduction assembly 4 includes a sound-producing device 41 disposed within the sound chamber 14 for producing sound and a digital signal processor 42 for driving the sound-producing device 41 to produce a particular sound.
The digital signal processor 42 is electrically connected between the external sound receiving device 2 and the sound generating device 41, the external sound receiving device 2 is arranged outside the sound cavity 14, after external noise is picked up, when the external noise penetrates through the shell 11 and enters the sound cavity 14 and is not picked up by the acoustoelectric transducer 13, the digital signal processor 42 receives the external noise picked up by the external sound receiving device 2, the digital signal processor 42 calculates and drives the sound generating device 41 to generate sound which is opposite in phase, consistent in amplitude and consistent in frequency with the noise transmitted into the sound cavity 14 from the outside, so that the external noise picked up by the acoustoelectric transducer 13 is greatly weakened, and target sound transmitted through the sealing cover can be effectively picked up.
Further, the digital signal processor 42 is electrically connected between the built-in radio device 3 and the sound generating device 41, the built-in radio device 3 is disposed in the sound cavity 14 to pick up the sound transmitted into the sound cavity, the sound includes the target sound and the participating external noise, the digital signal processor 42 receives the sound picked up by the built-in radio device 3, and compares the sound with the external noise picked up by the external radio device 2 to determine whether the residual external noise exists in the sound cavity 14, if the residual external noise exists, the digital signal processor 42 calculates the residual external noise and drives the sound generating device 41 to generate the sound with opposite phase, consistent amplitude and consistent frequency with the participating external noise, so as to further reduce the noise picked up by the acoustoelectric transducer 13.
Example two
As shown in fig. 2, the present invention also provides a sound monitor, which includes a probe 5 mounted with the active noise reduction module of the acoustoelectric sensor, wherein the probe 5 includes a shell 51 having an opening and a cap 52 covering the opening to form a containing cavity 53. The external radio device 2 is arranged outside the shell 51, the active noise reduction module of the acoustoelectric sensor is arranged in the accommodating cavity 53 except the external radio device 2, and is arranged close to the cap 52, target sound is transmitted into the acoustoelectric sensor assembly 1 through the cap 52, the cap 52 and the sealing cover 12 are preferably elastic devices, the cap 52 is preferably a silica gel cap, and the cap 52 is in direct contact with skin during measurement so that the acoustoelectric sensor assembly 1 can pick up more sounds inside the body.
The sound monitor can be preferably applied to a cardiopulmonary sound monitor, the influence of external noise on cardiopulmonary sound pickup is eliminated through an active noise reduction technology, and the quality of cardiopulmonary sound monitoring is improved. When the sound-wave-absorbing device is used, the cap 52 is close to the skin, heart sounds or lung sounds or vibration are transmitted into the acousto-electric sensor assembly 1 through the cap 52, meanwhile noise such as air conditioning sounds, fan sounds and surrounding human sounds in the environment is transmitted into the acousto-electric sensor assembly 1 through the shell 51, when the external noise penetrates through the shell 51 and the shell 11 and enters the sound cavity 14 and is not picked up by the acousto-electric transducer 13, the digital signal processor 42 receives the external noise, the digital signal processor 42 calculates and drives the sound-generating device 41 to generate sounds which are opposite in phase, consistent in amplitude and consistent in frequency with the noise transmitted into the sound cavity 14 from the outside, so that the external noise picked up by the acousto-electric transducer 13 is greatly weakened, and the heart sounds or lung sounds transmitted through the sealing cover can be effectively picked up; the built-in sound receiving device 3 picks up the sound transmitted into the sound cavity, which includes the target sound and the ambient noise involved, the digital signal processor 42 receives the sound in the sound cavity 14, comparing with the received external noise, judging whether residual external noise exists in the sound cavity 14, if so, calculating the residual external noise by the digital signal processor 42 and driving the sound generating device 41 to generate sound with opposite phase, consistent amplitude and consistent frequency with the external noise, further reducing the noise picked up by the acoustoelectric transducer 13, better picking up heart sound or lung sound, sending a signal to the circuit board 15 after the acoustoelectric transducer 13 receives the sound, amplifying the signal by an internal circuit of the circuit board 15, through signal output wire output to external signal receiving equipment, the user has more audio-visual observation to the heart sound or the lung sound of picking up, the follow-up operation of being convenient for.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided would be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego such subject matter, nor should the applicant consider that such subject matter is not considered part of the disclosed subject matter.
Claims (10)
1. The active noise reduction module of the acoustic-electric sensor is characterized by comprising an acoustic-electric sensor assembly for picking up target sound, a plurality of external sound receiving devices arranged outside the acoustic-electric sensor assembly and used for picking up external noise, at least one internal sound receiving device arranged in the acoustic-electric sensor assembly and used for picking up sound transmitted into the acoustic-electric sensor assembly, and a noise reduction assembly at least partially arranged in the acoustic-electric sensor assembly and used for reducing the picking-up noise of the acoustic-electric sensor assembly, wherein the noise reduction assembly is electrically connected with the external sound receiving devices and the internal sound receiving devices respectively.
2. The active noise reduction module of claim 1, wherein the noise reduction assembly comprises a sound generation device and a digital signal processor disposed within the acousto-electric sensor assembly.
3. The active noise reduction module of claim 2, wherein the digital signal processor is electrically connected between the external sound receiving device and the sound generating device, the digital signal processor receives external noise picked up by the external sound receiving device, and the system forms equal reverse sound waves to drive the sound generating device.
4. The active noise reduction module of claim 2, wherein the digital signal processor is further electrically connected between the built-in sound receiving device and the sound generating device, the digital signal processor receives the sound picked up by the built-in sound receiving device and transmitted into the acousto-electric sensor assembly, calculates the residual external noise, and the system forms equal reverse sound waves to drive the sound generating device.
5. The active acoustic-electric sensor noise reduction module of claim 2, wherein the acoustic-electric sensor assembly comprises a housing, a sealed enclosure covering the housing to form an acoustic cavity, and an acoustic-electric transducer disposed within the acoustic cavity.
6. The active noise reduction module of claim 5, wherein the external sound receiving device is disposed outside the sound cavity, and the internal sound receiving device and the sound generating device are disposed inside the sound cavity.
7. The active noise reduction module of claim 5, wherein the electroacoustic sensor assembly further comprises a circuit board disposed in the acoustic cavity and in signal communication with the acoustoelectric transducer for amplifying the signal.
8. Sound monitor, characterized in that it comprises a probe equipped with an active noise reduction module of an acousto-electric sensor according to any one of claims 1 to 7.
9. The sound monitor of claim 8, wherein the probe comprises a housing having an opening and a cap covering the opening to form a receiving cavity.
10. The sound monitor of claim 9, wherein the external sound receiving device is disposed outside the housing, and the portions of the acousto-electric sensor active noise reduction module other than the external sound receiving device are disposed in the accommodating cavity and are disposed close to the cap.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010901200.XA CN112055283A (en) | 2020-09-01 | 2020-09-01 | Active noise reduction module of acoustic-electric sensor and sound monitor |
| PCT/CN2020/122148 WO2022047905A1 (en) | 2020-09-01 | 2020-10-20 | Active noise reduction module of acoustoelectric sensor and sound monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010901200.XA CN112055283A (en) | 2020-09-01 | 2020-09-01 | Active noise reduction module of acoustic-electric sensor and sound monitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112055283A true CN112055283A (en) | 2020-12-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010901200.XA Pending CN112055283A (en) | 2020-09-01 | 2020-09-01 | Active noise reduction module of acoustic-electric sensor and sound monitor |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN112055283A (en) |
| WO (1) | WO2022047905A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114934696A (en) * | 2022-04-26 | 2022-08-23 | 上海新晃空调设备股份有限公司 | Modularization operating room |
| CN114934696B (en) * | 2022-04-26 | 2024-07-30 | 上海新晃空调设备股份有限公司 | Modularized operating room |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5713771B2 (en) * | 2011-04-11 | 2015-05-07 | 株式会社オーディオテクニカ | Soundproof microphone |
| JP6069829B2 (en) * | 2011-12-08 | 2017-02-01 | ソニー株式会社 | Ear hole mounting type sound collecting device, signal processing device, and sound collecting method |
| JP5765401B2 (en) * | 2013-10-07 | 2015-08-19 | オンキヨー株式会社 | Headphone |
| CN204993794U (en) * | 2015-09-15 | 2016-01-20 | 新科实业有限公司 | Sound system of device of making an uproar falls in area initiative |
| CN208447630U (en) * | 2017-10-17 | 2019-02-01 | 歌尔科技有限公司 | A kind of stethoscope |
| CN107750028B (en) * | 2017-12-06 | 2024-03-29 | 贵州翔通科技实业有限公司 | Earphone |
| CN108088064B (en) * | 2018-01-15 | 2023-05-23 | 青岛理工大学 | Active noise reduction device arranged on ventilation pipe orifice and capable of realizing acoustic interaction and control method |
| CN211152190U (en) * | 2020-03-26 | 2020-07-31 | 北京爱德发科技有限公司 | Half-in-ear active noise reduction earphone |
-
2020
- 2020-09-01 CN CN202010901200.XA patent/CN112055283A/en active Pending
- 2020-10-20 WO PCT/CN2020/122148 patent/WO2022047905A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114934696A (en) * | 2022-04-26 | 2022-08-23 | 上海新晃空调设备股份有限公司 | Modularization operating room |
| CN114934696B (en) * | 2022-04-26 | 2024-07-30 | 上海新晃空调设备股份有限公司 | Modularized operating room |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022047905A1 (en) | 2022-03-10 |
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