CN219248049U

CN219248049U - Active head small space noise reduction device

Info

Publication number: CN219248049U
Application number: CN202222910687.5U
Authority: CN
Inventors: 张承青; 张珂
Original assignee: Shanghai Shenglong Mechanical & Electrical Technology Co ltd
Current assignee: Shanghai Shenglong Mechanical & Electrical Technology Co ltd
Priority date: 2022-11-02
Filing date: 2022-11-02
Publication date: 2023-06-23
Anticipated expiration: 2032-11-02

Abstract

The utility model discloses an active head small space noise reduction device, wherein a vibrating plate is arranged on a shell; the vibration plate is provided with a pickup and a loudspeaker; the circuit board of the shell comprises a microprocessor, a power supply circuit, a pickup circuit, an acoustic wave generating circuit and a loudspeaker circuit; the pickup circuit is connected with the microprocessor and sends the collected noise signals to the microprocessor; the power circuit is connected with the microprocessor and the loudspeaker and provides power for the microprocessor and the loudspeaker; the sound wave generating circuit is connected with the microprocessor, receives signals of the microprocessor and generates noise reduction signals; the loudspeaker circuit is connected with the sound wave generating circuit and the loudspeaker, receives the noise reduction signal sent by the sound wave generating circuit and transmits noise reduction sound waves outwards through the loudspeaker. The active head small space noise reduction device has the advantages that a noise reduction area is formed in a small range space near the two ears of the head of a user, the interference of environmental noise is effectively reduced, and the like.

Description

Active head small space noise reduction device

Technical Field

The utility model relates to noise reduction equipment, in particular to an active head small-space noise reduction device.

Background

Noise pollution is one of four main environmental problems worldwide, and can affect normal life and work of people to different degrees. Noise reduction, as the name implies, is to reduce the effect of noise on humans. The usual methods are: sound insulation room, installation muffler, sound insulation barrier and damping etc. The sound-proof earmuffs are generally utilized to block the propagation path of sound waves, so that the small-range noise reduction between the human ears and the cavities of the earmuffs can be called small-space noise reduction. Noise reduction modes are divided into active noise reduction and passive noise reduction modes. Small space noise reduction often uses active noise reduction. The active noise reduction mainly uses a noise reduction system to generate reverse sound waves opposite to external noise, and then neutralizes the noise, so that the purpose of noise reduction is achieved. Each sound consists of a certain frequency spectrum, with no exception to noise. If the spectrum of the car noise is reached, its inverse sound wave can be created and then all the noise can be cancelled.

The utility model of China with the application number of CN202221469738.9 discloses a noise reduction headset, which comprises a headset fixing frame and a headset unit; the earphone fixing frame is arc-shaped, adjusting parts are symmetrically arranged at two ends of the earphone fixing frame, the lower part of the adjusting part is connected with an earphone unit, and an earphone shield is arranged on the inner side of the earphone unit; the adjusting piece comprises a connecting buckle, a sliding rod and a hinge piece, wherein the connecting buckle is arranged at the bottom of the earphone fixing frame, the sliding rod is inserted into the connecting buckle, two ends of the sliding rod extend out, the top of the hinge piece is connected with the bottom of the sliding rod, and the bottom of the hinge piece is hinged with the earphone unit. According to the utility model, the height of the earphone unit is changed through the adjusting piece, so that the earphone is suitable for people with different sizes to wear, the earphone shield is aligned to ears, and the comfort level is improved; the earphone unit can be rotated through the cooperation of hinge piece and locking screw, makes its laminating ear, makes earphone guard shield laminating face, reduces the interference of external sound.

The earphone type noise reduction device is a common noise reduction device. The earphone type noise reduction device is suitable for riding or walking and the like. But not when sleeping. Furthermore, both headphones and earbuds can become uncomfortable to the ear after a period of use.

Disclosure of Invention

The utility model provides an active head small space noise reduction device for avoiding the defects existing in the prior art, so that a noise reduction area is formed in a small range space near the two ears of the head of a user, and the interference of environmental noise is effectively reduced.

The utility model adopts the following technical scheme for solving the technical problems.

An active head small space noise reduction device is characterized by comprising a shell 1; a vibration plate 6 is arranged on the first side surface of the shell 1; the vibration plate 6 is provided with at least one pickup 4 and at least one speaker 3;

a circuit board 2 is arranged in the inner cavity of the shell 1; the circuit board comprises a microprocessor, a power supply circuit, a pickup circuit, an acoustic wave generating circuit and a loudspeaker circuit;

the pickup circuit is connected with the microprocessor and used for sending the collected noise signals to the microprocessor;

the power supply circuit is connected with the microprocessor and the loudspeaker 3 and is used for providing power supply for the microprocessor and the loudspeaker 3;

the sound wave generating circuit is connected with the microprocessor and is used for receiving signals of the microprocessor and generating noise reduction signals;

the loudspeaker circuit is connected with the sound wave generating circuit and the loudspeaker 3 and is used for receiving the noise reduction signal sent by the sound wave generating circuit and transmitting noise reduction sound waves outwards through the loudspeaker 3;

the pickup 4 on the vibration plate 6 is electrically connected with the pickup circuit of the circuit board 2;

the speaker 3 on the diaphragm 6 is electrically connected to the speaker circuit of the wiring board 2.

The utility model also provides a structure of the active head small space noise reduction device, which is characterized in that:

preferably, the housing 1 is preferably, but not limited to, rectangular parallelepiped.

Preferably, the shell 1 is preferably but not limited to a polymeric sheet, an aluminum sheet, a copper sheet or an alloy sheet.

Preferably, the vibration plate 6 is preferably, but not limited to, made of wood, plywood or a composite board.

Preferably, the microprocessor is also connected with a PID controller.

Preferably, the PID controller is preferably, but not limited to, a multi-channel digital PID controller.

Preferably, the speaker 3 is preferably, but not limited to, a vibratory speaker.

Preferably, at least one first mounting hole is provided on the vibration plate 6, and the speaker 3 is provided on the vibration plate 6 through the first mounting hole.

Preferably, at least one second mounting hole is provided on the vibration plate 6, and the pickup 4 is provided on the vibration plate 6 through the second mounting hole.

Preferably, the second side of the housing 1 is provided with a power interface 5.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model discloses an active head small space noise reduction device, wherein a vibrating plate is arranged on a shell; the vibration plate is provided with a pickup and a loudspeaker; the circuit board of the shell comprises a microprocessor, a power supply circuit, a pickup circuit, an acoustic wave generating circuit and a loudspeaker circuit; the pickup circuit is connected with the microprocessor and sends the collected noise signals to the microprocessor; the power circuit is connected with the microprocessor and the loudspeaker and provides power for the microprocessor and the loudspeaker; the sound wave generating circuit is connected with the microprocessor, receives signals of the microprocessor and generates noise reduction signals; the loudspeaker circuit is connected with the sound wave generating circuit and the loudspeaker, receives the noise reduction signal sent by the sound wave generating circuit and transmits noise reduction sound waves outwards through the loudspeaker.

In the utility model, the earphone or earplug is not used, but the device is arranged near two ears of the head of the user, and the pickup, the multichannel digital PID controller and the loudspeaker of the utility model work cooperatively to emit noise-reducing sound waves which are opposite to noise in a small-range space near the two ears of the head of the user, so that a small-range noise-reducing area is formed, and the aim of effectively reducing the interference of environmental noise is fulfilled.

The active head small space noise reduction device has the advantages that a noise reduction area is formed in a small range space near the two ears of the head of a user, the interference of environmental noise is effectively reduced, and the like.

Drawings

Fig. 1 is a perspective view of an active head small space noise reduction device of the present utility model.

Fig. 2 is a block diagram of a circuit board of an active head small space noise reduction device according to the present utility model.

FIG. 3 is a chip diagram of a microprocessor of an active head space noise reducer according to the present utility model.

Fig. 4 is a perspective view of another embodiment (oval shape) of an active head small space noise reducer of the present utility model.

The utility model is further described below by means of specific embodiments in connection with the accompanying drawings.

Detailed Description

Referring to fig. 1 to 4, an active head small space noise reduction device of the present utility model includes a housing 1; a vibration plate 6 is arranged on the first side surface of the shell 1; the vibration plate 6 is provided with at least one pickup 4 and at least one speaker 3;

In one embodiment, the housing 1 is preferably, but not limited to, rectangular parallelepiped.

In one embodiment, the housing 1 is preferably, but not limited to, made of a polymeric sheet material, an aluminum sheet material, a copper sheet material, or an alloy sheet material.

In one embodiment, the vibration plate 6 is preferably made of, but not limited to, a wood plate, a plywood plate, or a composite plate.

In the specific implementation, the shell can be made into a cuboid shape, a round cake shape or an elliptic cake shape. The shape of the product can be adjusted according to the space size or the installation position.

In one embodiment, the material of the vibration plate is preferably but not limited to wood matrix plates such as wood plates, plywood, composite plates and the like, and can also be made of high polymer plates or metal material plates such as aluminum plates, copper plates and the like. The material for manufacturing the shell is preferably but not limited to wood matrix plates such as wood plates, plywood, composite plates and the like, and can also be made of high polymer plates or metal material plates such as aluminum plates, copper plates and the like.

In one embodiment, a PID controller is also connected to the microprocessor.

In one embodiment, the PID controller is preferably, but not limited to, a multi-channel digital PID controller.

In one embodiment, the speaker 3 is preferably, but not limited to, a vibratory speaker.

In one embodiment, at least one first mounting hole is provided in the vibration plate 6, and the speaker 3 is provided in the vibration plate 6 through the first mounting hole.

In one embodiment, the vibration plate 6 is provided with at least one second mounting hole, and the pickup 4 is disposed on the vibration plate 6 through the second mounting hole.

In one embodiment, the second side of the housing 1 is provided with a power interface 5.

As shown in fig. 2, the sound pickup collects noise signals, the microprocessor is controlled by the 16-channel digital PID controller to generate anti-phase noise suppression signals with different frequency points, and the sound wave generating circuit and the loudspeaker circuit generate constant-amplitude anti-phase sound waves to cancel original noise.

In one embodiment, two noise-reducing speakers are placed near the ears of the user's head, respectively, and the two speakers are not hard-wired to each other to avoid interference.

As shown in fig. 1, the width and length dimensions of the single housing are controlled below 200mm and 250mm, respectively, so as to be mounted at various positions of the upper part of the backrest of the chair, the backrest of the bed head or sofa, the backrest top of the office chair or massage chair, etc. The shape may be rectangular, circular or oval (as in fig. 4, oval), or other shaped flat housing. A small hole is formed in the center of the vibrating plate on one face of the shell, and the pickup is arranged in the small hole. The loudspeaker is also positioned on the vibrating plate, and the circuit board is fixed on the other surface of the shell opposite to the vibrating plate and is not contacted with the vibrating template.

The device of the utility model consists of congruent symmetrical double channels, which are respectively close to two ears of the head of a user. The appearance can be matched with the surface of a seat or a bed board backrest, and the multifunctional chair is suitable for places such as trains, airplanes, automobile hospitals, kindergarten, geriatric homes, families and the like.

In the utility model, the noise frequency to be reduced is divided into two sections of high (H) and low (L) to be respectively processed:

l (hertz): 62. 68, 75, 82, 91, 100, 110, 120, 130, 150, 160, 180, 200, 220, 240, 16 frequency bins total.

H (hertz): 220. 240, 270, 300, 330, 360, 390, 430, 470, 510, 560, 620, 680, 750, 820, 910, are also 16 bins.

As shown in FIG. 2, PID control is performed on each frequency point through a PID controller and a microprocessor, so that the opposite-phase sound field and the original noise are equal in size and opposite in direction at each frequency point, and a noise reduction area with greatly reduced noise can be obtained.

As shown in FIG. 3, the microprocessor employs a DSP chip, model DSPIC33FJ128MC710A. Fig. 3 is a schematic circuit diagram of a microprocessor according to the present utility model. Only the pin diagram of the main control chip U3 is shown in fig. 3, and its peripheral circuits, such as a crystal oscillator, a reset circuit, etc., are conventionally designed in the art.

The vibration type speaker is mounted on the vibration plate, so that the vibration speaker point sound source with the diameter of only 20mm is enlarged to be a surface sound source with a large area.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. An active head small space noise reduction device is characterized by comprising a shell (1); a vibrating plate (6) is arranged on the first side surface of the shell (1); at least one pickup (4) and at least one loudspeaker (3) are arranged on the vibrating plate (6);

a circuit board (2) is arranged in the inner cavity of the shell (1); the circuit board comprises a microprocessor, a power supply circuit, a pickup circuit, an acoustic wave generating circuit and a loudspeaker circuit;

the power supply circuit is connected with the microprocessor and the loudspeaker (3) and is used for providing power supply for the microprocessor and the loudspeaker (3);

the loudspeaker circuit is connected with the sound wave generating circuit and the loudspeaker (3) and is used for receiving the noise reduction signal sent by the sound wave generating circuit and transmitting noise reduction sound waves outwards through the loudspeaker (3);

the pickup (4) on the vibrating plate (6) is electrically connected with the pickup circuit of the circuit board (2);

the loudspeaker (3) on the vibrating plate (6) is electrically connected with the loudspeaker circuit of the circuit board (2).

2. An active head small space noise reduction device according to claim 1, characterized in that the housing (1) is cuboid.

3. The active head small space noise reduction device according to claim 1, wherein the shell (1) is made of a high polymer sheet material, an aluminum plate, a copper plate or an alloy sheet material.

4. An active head small space noise reduction device according to claim 1, characterized in that the vibrating plate (6) is made of wood, plywood or composite board.

5. The active head small space noise reducer of claim 1, wherein the microprocessor is further connected with a PID controller.

6. An active head space noise reducer according to claim 5, wherein said PID controller is a multi-channel digital PID controller.

7. An active head small space noise reduction device according to claim 5, characterized in that the loudspeaker (3) is a vibrating loudspeaker.

8. An active head small space noise reduction device according to claim 1, characterized in that the vibration plate (6) is provided with at least one first mounting hole, and the loudspeaker (3) is arranged on the vibration plate (6) through the first mounting hole.

9. An active head small space noise reduction device according to claim 1, characterized in that the vibration plate (6) is provided with at least one second mounting hole, and the pickup (4) is arranged on the vibration plate (6) through the second mounting hole.

10. Active head small space noise reduction device according to claim 1, characterized in that a power interface (5) is provided on the second side of the housing (1).