CN209750457U - Foldable initiative noise reduction seat - Google Patents
Foldable initiative noise reduction seat Download PDFInfo
- Publication number
- CN209750457U CN209750457U CN201920520809.5U CN201920520809U CN209750457U CN 209750457 U CN209750457 U CN 209750457U CN 201920520809 U CN201920520809 U CN 201920520809U CN 209750457 U CN209750457 U CN 209750457U
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- China
- Prior art keywords
- noise reduction
- active noise
- headrest
- folding
- microphone
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- Expired - Fee Related
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
Abstract
The utility model discloses a folding active noise reduction seat, which comprises a folding seat, wherein the back of the folding seat is provided with a headrest, and the top end of the back is provided with a sound-absorbing pad; a reference microphone, an error microphone and a loudspeaker are arranged on the front side of the headrest; the backrest is provided with an active noise reduction controller which is respectively and electrically connected with the reference microphone, the error microphone and the loudspeaker; the active noise reduction controller is used for processing the environmental noise and generating a secondary sound source with the phase opposite to that of the environmental noise; the active noise reduction controller is also electrically connected with a control and display device arranged on the front side of the backrest; the active noise reduction controller, the reference microphone, the error microphone, the control and display device and the loudspeaker are respectively connected with the power supply. The secondary sound source is offset with the noise at the headrest, so that a mute area is formed at the ears of the headrest, the active noise reduction of the household seat is realized, and the noise reduction effect is good.
Description
Technical Field
The utility model belongs to the technical field of furniture, a foldable initiative noise reduction seat is related to.
Background
With the development of society, people put forward higher comfort requirements on the home environment where the people are, wherein the requirements on the household seat are expressed in terms of noise reduction effect and comfort effect of the seat. At present, manufacturers add measures such as a cushion and a back cushion on a seat to achieve a comfortable effect, but no good noise reduction measure exists at present.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem provide a foldable initiative noise reduction seat, realized the function of making an uproar of falling under the house environment.
The utility model discloses a realize through following technical scheme:
A folding active noise reduction seat comprises a folding seat, wherein a backrest is arranged on the rear side of the folding seat, and a headrest is arranged at the top end of the backrest; a reference microphone, an error microphone and a loudspeaker are arranged on the front side of the headrest; the backrest is provided with an active noise reduction controller which is respectively and electrically connected with the reference microphone, the error microphone and the loudspeaker; the active noise reduction controller is used for processing the environmental noise and generating a secondary sound source with the phase opposite to that of the environmental noise; the active noise reduction controller is also electrically connected with a control and display device arranged on the front side of the backrest; the active noise reduction controller, the reference microphone, the error microphone, the control and display device and the loudspeaker are respectively connected with the power supply.
Further, the reference microphones are also symmetrically arranged on two sides of the top of the front side of the backrest.
Further, the active noise reduction controller comprises an active filter of which the input end is connected with the reference microphone.
Furthermore, the active noise reduction controller also comprises a self-adaptive filter, the input end of the self-adaptive filter is respectively connected with the active filter and the error microphone, the output end of the self-adaptive filter is connected with a signal amplifier, and the output end of the signal amplifier is connected with the loudspeaker.
furthermore, the headrest is in an inwards concave arc shape, and the error microphone and the loudspeaker are symmetrically arranged on two sides of the headrest; the reference microphone is disposed on top of the headrest.
Furthermore, the reference microphone and the error microphone both adopt capacitance type microphone heads.
Furthermore, the control and display are controlled by a touch screen.
Furthermore, the back side of the headrest is provided with an acoustic panel.
Compared with the prior art, the utility model discloses following profitable technological effect has:
The utility model provides a pair of foldable initiative noise reduction seat, indoor noise is through establishing reference microphone and the error microphone on the headrest, turn into analog noise signal, then through the initiative noise reduction controller handle produce secondary sound source signal and through speaker output and indoor noise opposite phase's secondary sound source, secondary sound source offsets with ambient noise, thereby form the silence area in headrest people's ear department, realized falling the initiative of near headrest noise and making an uproar, its noise reduction effect is good.
Drawings
FIG. 1 is a structural view of the noise reduction seat of the present invention;
Fig. 2 is the noise reduction performance schematic diagram of each frequency band of the present invention.
Wherein, the device comprises a backrest 1, a headrest 2, a loudspeaker 3, a reference microphone 4, an error microphone 5, an active noise reduction controller 6 and a control and display 7.
Detailed Description
the present invention will now be described in further detail with reference to the attached drawings, which are provided for purposes of illustration and not limitation.
Specific examples are given below.
As shown in fig. 1, the folding active noise reduction seat comprises a folding seat, wherein a backrest 1 is arranged at the rear side of the folding seat, and a headrest 2 is arranged at the top end of the backrest 1; the front side of the headrest 2 is provided with a reference microphone 4, and the two sides of the top of the front side of the backrest 1 are symmetrically provided with the reference microphones 4; error microphones 5 and loudspeakers 3 are symmetrically arranged on both sides of the headrest 2; the backrest 1 is provided with an active noise reduction controller 6 which is respectively and electrically connected with the reference microphone 4, the error microphone 5 and the loudspeaker 3; the active noise reduction controller 6 comprises an adaptive filter, a signal gain device, a digital-to-analog converter and an analog-to-digital converter; the active noise reduction controller 6 is used for processing the environmental noise and generating a secondary sound source with the phase opposite to that of the environmental noise; the active noise reduction controller 6 is also electrically connected with a control and display 7 arranged at the front side of the backrest 1; the control and display 7 can control the working mode of the active noise reduction controller 6 at any time and check the running condition thereof. In this embodiment, the control and display 7 can switch the working state of the active noise reduction controller 6, and the working state includes: standby mode, operating mode and sleep mode. The control and display 7 may also display the current main noise level, the mute and noise level and the noise reduction level; the control and display 7 adopts touch screen control, thus avoiding the occurrence of control failure caused by key failure under key control; the active noise reduction controller 6, the reference microphone 4, the error microphone 5, the control and display 7 and the loudspeaker 3 are connected to a power supply, respectively. The power supply adopts rechargeable battery, such as 12V lead storage battery, and cooperates with corresponding voltage-stabilizing integrated circuit to control voltage of the power supply
In addition, the reference microphone 4 collects main noise in the directions of the front side and the rear side of the seat, and sends the main noise to the core controller of the active noise reduction controller 6 for operation; the main noise is low-medium frequency complex noise near the seat formed by overlapping or irregularly offsetting one or more sounds such as air conditioner noise, fan noise, decoration electric drill noise, human noise, outdoor fan noise and the like in the transmission process, and is converted into a main analog noise signal after being collected by the reference microphone 4. The reference microphone 4 adopts a capacitance microphone, and has high sensitivity, long service life and low cost.
What should be noted above is that the error microphone 5 is used to collect residual noise sensed by human ears and convert the residual noise into residual analog noise signals, and then send the residual analog noise signals into the core controller of the active noise reduction controller 6 for operation; after the residual analog noise signal and the main analog noise signal are processed by a core controller of the active noise reduction controller 6, a secondary sound source with a phase opposite to that of the main noise is output through the loudspeaker 3; after the secondary sound source is offset with the indoor noise, new residual noise is generated and then transmitted to a core controller of the active noise reduction controller 6 through the error microphone 5; the error microphone 5 adopts a capacitance microphone, and has high sensitivity, long service life and low cost.
To the above description, the active noise reduction controller 6 includes an active filter; the active noise reduction controller 6 further comprises a self-adaptive filter, the input end of the self-adaptive filter is respectively connected with the active filter and the error microphone 4, the output end of the self-adaptive filter is connected with the signal amplifier, and the output end of the signal amplifier is connected with the loudspeaker 3. The core controller of the active noise reduction controller 6 adopts STM32, processes the main noise analog signal and the residual noise analog signal transmitted by the reference microphone 4 and the error microphone 5 by using FX-LMS algorithm, then outputs a secondary analog sound source signal with the same amplitude and opposite phase with the environmental noise signal to the loudspeaker 3 after being processed by an adaptive filter, and cancels the secondary sound source signal output by the loudspeaker 3 with the indoor noise to realize the active noise reduction function.
To be noted, the active noise reduction controller 6 receives the main analog noise signal of the environment, and performs a series of filtering on the main analog noise signal by the adaptive filter to generate a secondary analog sound source signal corresponding to the main analog noise signal, outputs a secondary analog sound source signal to offset the main noise to generate a residual noise, the residual noise is processed by the error microphone 5 and the active noise reduction controller 6, the order, the parameters and the convergence factor of the adaptive filter are continuously adjusted by the residual noise to determine the parameters of the optimal control system, the obtained secondary sound source signal processed by the adaptive filter unit under the parameters of the optimal control system is output by the speaker 3 to offset the main noise, and a mute region is formed at the ear position.
Furthermore, the headrest 2 is in an inwards concave arc shape, which accords with the principle of human engineering; in addition, the secondary sound source output from the loudspeaker 3 can be oriented to the human ear, so that the noise near the human ear can be counteracted to the maximum extent, and the noise reduction effect at the human ear is better; in addition, the sound-absorbing plate is arranged on the rear side of the headrest 2, so that noise transmitted from the back of the seat can be absorbed, the noise is prevented from being directly transmitted to ears of a person through the headrest, and the noise reduction effect of the seat is further enhanced.
As shown in fig. 2, the present embodiment further discloses the noise reduction amplitude measured at the headrest 2 before and after the noise reduction function of the home active noise reduction seat is turned on in a certain environment; it can obviously reduce the noise amplitude of 2 departments of headrest, and then the personnel sit and lie on the seat, can obviously reduce the noise amplitude of people's ear department.
The embodiments given above are preferred examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical features of the technical solution of the present invention by those skilled in the art all belong to the protection scope of the present invention.
Claims (8)
1. A folding active noise reduction seat comprises a folding seat and is characterized in that a backrest (1) is arranged at the rear side of the folding seat, and a headrest (2) is arranged at the top end of the backrest (1); a reference microphone (4), an error microphone (5) and a loudspeaker (3) are arranged on the front side of the headrest (2); an active noise reduction controller (6) which is respectively and electrically connected with the reference microphone (4), the error microphone (5) and the loudspeaker (3) is arranged on the backrest (1); the active noise reduction controller (6) is used for processing the environmental noise and generating a secondary sound source opposite to the phase of the environmental noise; the active noise reduction controller (6) is also electrically connected with a control and display (7) arranged at the front side of the backrest (1); the active noise reduction controller (6), the reference microphone (4), the error microphone (5), the control and display device (7) and the loudspeaker (3) are respectively connected with a power supply.
2. A folding active noise reduction seat according to claim 1, characterized in that said reference microphones (4) are also symmetrically arranged on the top two sides of the front side of the backrest (1).
3. A folding active noise reduction seat according to claim 1, characterized in that the active noise reduction controller (6) comprises an active filter with an input connected to the reference microphone (4).
4. A folding active noise reduction seat according to claim 3, characterized in that the active noise reduction controller (6) further comprises an adaptive filter, the input terminals of the adaptive filter are respectively connected with the active filter and the error microphone (5), the output terminal of the adaptive filter is connected with a signal amplifier, and the output terminal of the signal amplifier is connected with the loudspeaker (3).
5. A folding active noise reduction seat according to claim 1, characterized in that the headrest (2) is concave arc-shaped, and the error microphone (5) and the speaker (3) are symmetrically arranged at two sides of the headrest (2); the reference microphone (4) is arranged on the top of the headrest (2).
6. A folding active noise reduction seat according to claim 1 or 5, characterized in that the reference microphone (4) and the error microphone (5) are both condenser microphones.
7. A folding active noise reduction seat according to claim 1, characterized in that said control and display (7) is touch screen controlled.
8. A folding active noise reduction seat according to claim 1, characterized in that the back side of the headrest (2) is provided with a sound absorption board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920520809.5U CN209750457U (en) | 2019-04-17 | 2019-04-17 | Foldable initiative noise reduction seat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920520809.5U CN209750457U (en) | 2019-04-17 | 2019-04-17 | Foldable initiative noise reduction seat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209750457U true CN209750457U (en) | 2019-12-10 |
Family
ID=68759582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920520809.5U Expired - Fee Related CN209750457U (en) | 2019-04-17 | 2019-04-17 | Foldable initiative noise reduction seat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209750457U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110025154A (en) * | 2019-04-17 | 2019-07-19 | 陕西科技大学 | A kind of household active noise reduction seat and the active denoising method applied to it |
| CN113066467A (en) * | 2021-03-15 | 2021-07-02 | 南京大学 | Rest chair suitable for being used in noisy environment based on Internet of things |
-
2019
- 2019-04-17 CN CN201920520809.5U patent/CN209750457U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110025154A (en) * | 2019-04-17 | 2019-07-19 | 陕西科技大学 | A kind of household active noise reduction seat and the active denoising method applied to it |
| CN113066467A (en) * | 2021-03-15 | 2021-07-02 | 南京大学 | Rest chair suitable for being used in noisy environment based on Internet of things |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191210 Termination date: 20200417 |
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| CF01 | Termination of patent right due to non-payment of annual fee |