Noise reduction system and vehicle-mounted oxygen generator

Abstract

The invention provides a noise reduction system and a vehicle-mounted oxygen generator, and belongs to the technical field of noise reduction treatment. The noise reduction system is applied to the vehicle-mounted oxygen generator and comprises a signal acquisition device, a signal processing device and a noise reduction output device, the signal acquisition device is used for acquiring a noise signal corresponding to the vehicle-mounted oxygen generator and sending the noise signal to the signal processing device; the signal processing device is used for generating an anti-phase sound wave signal based on the noise signal and a preset noise reduction scheme, and sending the anti-phase sound wave signal to the noise reduction output device; and the noise reduction output device is used for playing the anti-phase sound wave signal to offset the noise signal. With the adoption of the vehicle-mounted oxygenerator, the noise signal generated by the vehicle-mounted oxygenerator can be counteracted and neutralized by the anti-phase sound wave signal, so that the effect of targeted noise reduction is achieved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of noise reduction processing, and particularly relates to a noise reduction system and an on-vehicle oxygen generator. Background Art

[0002] An on-vehicle oxygen generator is a healthcare device that can produce oxygen and meet the portable needs of users. Its main technical principle is to separate oxygen in the air at high speed through a compressor, so as to provide high-concentration oxygen.

[0003] However, the mechanical noise and high-frequency airflow noise generated inside the on-vehicle oxygen generator during operation will inevitably affect the user experience, and currently there is still a lack of a solution that can effectively reduce the noise of the on-vehicle oxygen generator. Summary of the Invention

[0004] The present disclosure provides a noise reduction system and an on-vehicle oxygen generator, which can solve the technical problems existing in the related art. The technical solutions are as follows:

[0005] On the one hand, the present disclosure provides a noise reduction system. The noise reduction system is applied to an on-vehicle oxygen generator, and the noise reduction system includes a signal acquisition device, a signal processing device, and a noise reduction output device;

[0006] The signal acquisition device is used to acquire the noise signal corresponding to the on-vehicle oxygen generator and send the noise signal to the signal processing device;

[0007] The signal processing device is used to generate an anti-sound wave signal based on the noise signal and a preset noise reduction scheme, and send the anti-sound wave signal to the noise reduction output device;

[0008] The noise reduction output device is used to play the anti-sound wave signal to cancel the noise signal.

[0009] In a possible implementation manner, the signal acquisition device is further used to acquire the vibration spectrum data of the on-vehicle oxygen generator;

[0010] The signal processing device is used to: calculate the correlation coefficient between the vibration spectrum data and the noise signal, and if the correlation coefficient is greater than a preset coefficient threshold, generate the anti-sound wave signal.

[0011] In a possible implementation manner, the signal acquisition device includes a first microphone and a second microphone;

[0012] The first microphone is used to be installed outside the pipeline joint corresponding to the oxygen outlet of the on-vehicle oxygen generator to acquire a first part of the noise signal and send the first part of the noise signal to the signal processing device;

[0013] The second microphone is used to be installed on the inner wall of the cabin of the compressor of the on-vehicle oxygen generator to collect a second part of the noise signal and send the second part of the noise signal to the signal processing device.

[0014] The signal processing device is used to superimpose the first part of the noise signal and the second part of the noise signal to obtain the noise signal.

[0015] In a possible implementation manner, the signal processing device is used to:

[0016] Generate the anti-sound wave signal based on the noise data and the adaptive filtering algorithm.

[0017] In a possible implementation manner, the noise reduction system further includes an error microphone, and the error microphone is used to collect an error feedback signal and send the error feedback signal to the signal processing device;

[0018] The signal processing device is used to:

[0019] When the error feedback signal meets the noise reduction condition, update the filter weights to obtain an updated adaptive filtering algorithm;

[0020] Generate the anti-sound wave signal based on the noise data and the updated adaptive filtering algorithm.

[0021] In a possible implementation manner, the signal processing device is used to:

[0022] Obtain the current compressor speed and the current oxygen flow rate of the on-vehicle oxygen generator;

[0023] Update the filter weights based on the current compressor speed and the current oxygen flow rate.

[0024] In a possible implementation manner, the signal processing device is used to:

[0025] Based on the corresponding relationship between the compressor speed, the oxygen flow rate, and the step factor stored in the preset parameter table, determine the current step factor corresponding to the current compressor speed and the current oxygen flow rate;

[0026] Update the filter weights based on the current step factor.

[0027] In a possible implementation manner, the noise reduction condition is that the sound pressure level of the error feedback signal is greater than a preset sound pressure level threshold.

[0028] In a possible implementation manner, the noise reduction output device is used to:

[0029] When the duration after the signal acquisition device acquires the noise signal reaches a preset delay duration, the anti-sound wave signal is played.

[0030] On the other hand, the present disclosure provides an in-vehicle oxygen generator, and the in-vehicle oxygen generator includes the noise reduction system as described in any one of the above.

[0031] The technical solutions provided by the present disclosure at least include the following beneficial effects:

[0032] The present disclosure provides a noise reduction system, which can generate a corresponding anti-sound wave signal for the acquired noise signal generated by the in-vehicle oxygen generator. After the noise reduction output device plays the anti-sound wave signal, the anti-sound wave signal can cancel and neutralize the noise signal generated by the in-vehicle oxygen generator, thereby playing a targeted noise reduction role.

[0033] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 is a schematic diagram of the working process of a noise reduction system shown in an embodiment of the present disclosure;

[0036] Figure 2 is a schematic diagram of the working process of a noise reduction system shown in an embodiment of the present disclosure;

[0037] Figure 3 is a schematic diagram of the process of generating an anti-sound wave signal shown in an embodiment of the present disclosure.

[0038] LEGEND DESCRIPTION

[0039] 1. Signal acquisition device;

[0040] 2. Signal processing device;

[0041] 3. Noise reduction output device;

[0042] 4. Error microphone. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] Unless otherwise defined, technical terms or scientific terms used herein shall have the ordinary meanings as understood by those of ordinary skill in the art to which this disclosure pertains. The terms "first", "second", "third" and similar terms used in the description and claims of this patent application of the disclosure do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "an" do not denote a quantity limitation, but mean that there is at least one. Terms such as "comprising" or "including" mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. Terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left", "right" are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0044] To make the objectives, technical solutions and advantages of this disclosure clearer, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings.

[0045] An embodiment of this disclosure provides a noise reduction system. Referring to Figure 1 , the noise reduction system includes a signal acquisition device 1, a signal processing device 2, and a noise reduction output device 3. The signal acquisition device 1, the signal processing device 2, and the noise reduction output device 3 are electrically connected or communicatively connected in sequence.

[0046] Referring to Figure 1 and Figure 2 , the working process of the noise reduction system can be as follows:

[0047] Step 201: The signal acquisition device 1 is used to acquire the noise signal corresponding to the on-vehicle oxygen generator and send the noise signal to the signal processing device 2.

[0048] In implementation, when the on-vehicle oxygen generator is working, mechanical noises such as gear meshing are generated by components such as its internal compressor, and high-frequency airflow noises are also carried at the oxygen outlet of the on-vehicle oxygen generator, thereby affecting people's usage experience of the on-vehicle oxygen generator.

[0049] The signal acquisition device 1 can be installed on the on-vehicle oxygen generator, so as to specifically acquire noise signals such as mechanical noises and high-frequency airflow noises generated when the on-vehicle oxygen generator is working.

[0050] In a possible implementation, the signal acquisition device 1 may include a microphone, which is used to acquire the noise signal generated when the on-vehicle oxygen generator is working, convert the analog signal into a digital signal, and send it to the signal processing device 2. Alternatively, it may also be other acquisition devices capable of obtaining the noise signal, and the embodiments of the present disclosure do not limit this.

[0051] Step 202: The signal processing device 2 is configured to generate an anti-sound wave signal based on the noise signal and a preset noise reduction scheme, and send the anti-sound wave signal to the noise reduction output device 3.

[0052] In implementation, when the signal processing device 2 receives the noise signal sent by the signal acquisition device 1, it may process the noise signal according to the preset noise reduction scheme, so as to generate an anti-sound wave signal with the same amplitude and opposite phase, and send the anti-sound wave signal to the noise reduction output device 3.

[0053] Step 203: The noise reduction output device 3 is configured to play the anti-sound wave signal to cancel the noise signal.

[0054] In implementation, when the noise reduction output device 3 receives the anti-sound wave signal, it may convert the anti-sound wave signal from a digital signal into an analog signal for playing. When the played anti-sound wave signal meets the noise signal generated by the on-vehicle oxygen generator, cancellation and neutralization will occur, thereby playing a role in noise reduction.

[0055] The noise reduction output device 3 may be installed on the on-vehicle oxygen generator, so as to specifically perform noise reduction processing on the noise generated by the on-vehicle oxygen generator and improve the noise reduction performance.

[0056] In a possible implementation, the noise reduction output device 3 may be a speaker, which converts the digital signal into an analog signal to realize the playback of the anti-sound wave signal. Alternatively, the noise reduction output device 3 may also be other reasonable output devices, and the embodiments of the present disclosure do not limit this.

[0057] Through the noise reduction system provided by the embodiments of the present disclosure, targeted noise reduction processing can be performed on the on-vehicle oxygen generator, thereby reducing the noise generated when the on-vehicle oxygen generator is working.

[0058] In a possible implementation, the signal acquisition device 1 may include a first microphone and a second microphone.

[0059] Among them, the first microphone is used to be installed outside the pipeline joint corresponding to the oxygen outlet of the on-vehicle oxygen generator to acquire the first part of the noise signal and send the first part of the noise signal to the signal processing device 2.

[0060] In implementation, the first microphone can be installed outside the pipeline joint of the oxygen outlet of the on-vehicle oxygen generator, so as to collect the high-frequency airflow noise at the oxygen outlet and obtain the first part of the noise signal. For example, this first part of the noise signal can be high-frequency airflow noise with a frequency of 1.2 KHz to 3.6 KHz.

[0061] The second microphone is used to be installed on the inner wall of the engine compartment of the compressor of the on-vehicle oxygen generator to collect the second part of the noise signal and send the second part of the noise signal to the signal processing device 2.

[0062] In implementation, the second microphone can be installed on the inner wall of the engine compartment of the compressor of the on-vehicle oxygen generator, so as to collect the mechanical noise generated when the compressor works and obtain the second part of the noise signal. For example, this second part of the noise signal can be mechanical noise with a spectrum of about 240 Hz.

[0063] The signal processing device 2 is used to superimpose the first part of the noise signal and the second part of the noise signal to obtain the noise signal.

[0064] In implementation, the signal processing device 2 can superimpose the first part of the noise signal and the second part of the noise signal, so as to obtain the noise signal corresponding to the on-vehicle oxygen generator. The noise signal mainly includes the mechanical noise generated by the compressor of the on-vehicle oxygen generator and the high-frequency airflow noise generated by the oxygen outlet, which has strong pertinence, thus reducing the proportion of environmental noise, enabling the finally generated anti-sound wave signal to specifically reduce the noise generated by the on-vehicle oxygen generator and improving the noise reduction performance of the on-vehicle oxygen generator.

[0065] In a possible implementation manner, refer to Figure 1 , the signal acquisition device 1 is further used to collect the vibration spectrum data of the on-vehicle oxygen generator.

[0066] The signal processing device 2 is further used to: calculate the correlation coefficient between the vibration spectrum data and the noise signal, and if the correlation coefficient is greater than the preset coefficient, then generate an anti-sound wave signal.

[0067] In implementation, when the on-vehicle oxygen generator works, it will vibrate, and as the working gear of the on-vehicle oxygen generator changes, its vibration frequency, vibration amplitude, etc. will also change. For example, when the gear of the on-vehicle oxygen generator is larger, its vibration frequency and vibration amplitude are also larger, and the generated noise will also be larger.

[0068] Therefore, the vibration spectrum data of the on-vehicle oxygen generator can be obtained through the signal acquisition device 1, and then the correlation coefficient between the vibration spectrum data and the noise signal is calculated.

[0069] If the correlation coefficient is greater than the preset coefficient threshold, it indicates that there is a large correlation between the vibration spectrum data and the noise signal. Most of the collected noise signal is the noise generated by the on-vehicle oxygen generator rather than the ambient noise. At this time, the signal processing device 2 can generate a corresponding anti-sound wave signal based on the noise signal and send the anti-sound wave signal to the noise reduction output device 3. Then, the noise reduction output device 3 plays the anti-sound wave signal, thereby performing targeted noise reduction processing on the noise generated by the on-vehicle oxygen generator.

[0070] If the correlation coefficient is less than or equal to the preset coefficient threshold, it indicates that the correlation between the vibration spectrum data and the noise signal is small. Most of the collected noise signal is ambient noise rather than the noise generated by the on-vehicle oxygen generator, indicating that the on-vehicle oxygen generator does not generate noise or generates little noise at this time. At this time, the signal processing device 2 can not perform the subsequent processing of generating the anti-sound wave signal, that is, there is no need to perform noise reduction processing on the on-vehicle oxygen generator.

[0071] In the embodiment of the present disclosure, referring to Figure 1 , the signal acquisition device 1 may include multiple acceleration sensors or multiple vibration sensors to capture the vibration spectrum data of the on-vehicle oxygen generator through the acceleration sensors or vibration sensors. Of course, the vibration spectrum data can also be obtained through other reasonable devices, and the embodiment of the present disclosure does not limit this.

[0072] The acceleration sensor or vibration sensor can be installed on the vibration source component of the on-vehicle oxygen generator. For example, it can be installed on the base of the compressor of the on-vehicle oxygen generator. As the compressor vibrates, the sensor obtains the vibration spectrum data.

[0073] Four groups of acceleration sensors or vibration sensors can be installed at the four corners of the base of the compressor to obtain more accurate vibration spectrum data.

[0074] In a possible implementation manner, referring to Figure 3 , the method for the signal processing device 2 to generate the anti-sound wave signal can be: generating the anti-sound wave signal based on the noise data and the adaptive filtering algorithm.

[0075] In implementation, the noise data can be input into the adaptive filtering algorithm for adaptive filtering processing to obtain the anti-sound wave signal corresponding to the noise data.

[0076] Further, referring to Figure 1 and Figure 3 , the noise reduction system may further include an error microphone 4, which is used to collect the error feedback signal and send the error feedback signal to the signal processing device 2.

[0077] In implementation, the error microphone 4 can continuously acquire audio data (i.e., the error feedback signal), which is the noise situation near the on-vehicle oxygen generator after the anti-sound wave signal is played. After the error microphone 4 acquires this error feedback signal, it can send it to the signal processing device 2 for processing.

[0078] The signal processing device 2 is used to: when the error feedback signal meets the noise reduction condition, update the filter weights to obtain an updated adaptive filtering algorithm; generate an anti-sound wave signal based on the noise data and the updated adaptive filtering algorithm.

[0079] In implementation, after the signal processing device 2 receives the error feedback signal, it can determine whether the error feedback signal meets the noise reduction condition. If it meets, it means that the noise reduction effect of the previously output anti-sound wave signal does not meet the requirements and further improvement of the noise reduction effect is needed. At this time, the filter weights can be updated, and a new anti-sound wave signal can be generated through the updated adaptive filtering algorithm to improve the noise reduction effect through this anti-sound wave signal.

[0080] If it does not meet, it means that the noise reduction effect of the previously output anti-sound wave signal already meets the noise reduction requirements and there is no need to adjust it further. The anti-sound wave signal can continue to be generated according to the current filter weights, thus ensuring the noise reduction effect.

[0081] In this way, after the generated anti-sound wave signal is played, the error feedback signal collected by the error microphone 4 is used to adjust the filter weights in real time, so that the generated anti-sound wave signal can further improve the noise reduction effect.

[0082] In the embodiments of the present disclosure, the error microphone 4 can be arranged on the top of the on-vehicle oxygen generator housing to obtain the noise situation of the on-vehicle oxygen generator. Of course, the error microphone 4 can also be installed at other positions of the on-vehicle oxygen generator and can be set according to actual situations and requirements.

[0083] In a possible implementation manner, the method for updating the filter weights can be as follows:

[0084] The signal processing device 2 is used to: obtain the current compressor speed and the current oxygen flow of the on-vehicle oxygen generator; update the filter weights based on the current compressor speed and the current oxygen flow.

[0085] In implementation, when it is necessary to update the filter weights, the current compressor speed and the current oxygen flow rate of the on-vehicle oxygen generator can be obtained. The current compressor speed and the current oxygen flow rate can reflect the current working state of the on-vehicle oxygen generator, thereby affecting the noise situation generated by the on-vehicle oxygen generator. For example, when the current compressor speed and the current oxygen flow rate are large, the noise of the on-vehicle oxygen generator is also large; when the current compressor speed and the current oxygen flow rate are small, the noise of the on-vehicle oxygen generator is also small.

[0086] Therefore, the filter weights can be updated and adjusted in real time according to the current compressor speed and the current oxygen flow rate, so that the noise reduction effect of the anti-phase sound wave signal generated by the updated filter weights is better.

[0087] Among them, the method of obtaining the current compressor speed and the current oxygen flow rate of the on-vehicle oxygen generator can be to obtain them by reading the CAN bus signal of the main control board of the on-vehicle oxygen generator. Of course, it can also be obtained through other channels. The embodiments of the present disclosure do not limit this.

[0088] In a possible implementation manner, the method of updating the filter weights based on the current compressor speed and the current oxygen flow rate can be as follows:

[0089] The signal processing device 2 is used to: determine the current step factor corresponding to the current compressor speed and the current oxygen flow rate based on the corresponding relationship between the compressor speed, oxygen flow rate, and step factor stored in the preset parameter table; update the filter weights based on the current step factor.

[0090] In implementation, the preset parameter table records the step factors corresponding to different compressor speeds and different oxygen flow rates. The current step factor can be obtained by looking up the table in the preset parameter table according to the current compressor speed and the current oxygen flow rate, and the filter weights can be updated in real time according to the current step factor.

[0091] In a possible implementation manner, the update formula of the filter weights can be as follows:

[0092] W(n + 1) = W(n) + μ * X(n) * X T (n) + δ * e(n) * X(n) Formula (1)

[0093] Among them, W(n + 1) is the updated filter weight, W(n) is the filter weight, μ is the current step factor, X(n) is the input signal, that is, the noise signal, X T (n) is related to time, δ can be any value between 1e-6 and 1e-3, and e(n) is the error signal.

[0094] According to the above formula (1), the filter weights can be updated in real time.

[0095] In a possible implementation, the above-mentioned noise reduction condition may be that the sound pressure level of the error feedback signal is greater than a preset sound pressure level threshold.

[0096] In implementation, after the signal processing device 2 receives the error feedback signal, it can calculate the sound pressure level of the error feedback signal (for example, A-weighted sound pressure level, etc.), and then compare the sound pressure level of the error feedback signal with the preset sound pressure level threshold.

[0097] If the sound pressure level of the error feedback signal is greater than the preset sound pressure level threshold, it means that the noise reduction effect of the previously output anti-sound wave signal does not meet the noise reduction requirement, and the noise reduction effect needs to be further improved. Then, the filter weights can be updated.

[0098] If the sound pressure level of the error feedback signal is less than or equal to the preset sound pressure level threshold, it means that the noise reduction effect of the previously output anti-sound wave signal has met the noise reduction requirement, and no further adjustment is needed. Only the current filter weights need to be continued to be used to generate the anti-sound wave signal.

[0099] In this way, the filter weights can be adjusted in real time to ensure that the generated anti-sound wave signal can effectively cancel the noise signal, thereby improving the noise reduction effect.

[0100] Among them, the preset sound pressure level threshold can be any reasonable value. For example, it can be 45 dB, etc. It can be set according to the actual noise reduction requirement, and the embodiments of the present disclosure do not limit this.

[0101] In a possible implementation, the noise reduction output device 3 is used to: play the anti-sound wave signal when the duration after the signal acquisition device 1 acquires the noise signal reaches a preset delay duration.

[0102] In implementation, since there is still a certain distance between the noise generation position of the on-vehicle oxygen generator and the noise reduction output device 3, there is a certain phase difference between the anti-sound wave signal and the noise emitted by the on-vehicle oxygen generator. Therefore, a preset delay duration can be set. The noise reduction output device 3 can play the anti-sound wave signal when the duration after the signal acquisition device 1 acquires the noise signal reaches the preset delay duration, so that the anti-sound wave signal can accurately cancel the noise signal, thereby improving the noise reduction effect.

[0103] In the embodiments of the present disclosure, the noise reduction output device 3 may include a plurality of speakers. Each speaker may be disposed on the inner wall of the housing of the on-vehicle oxygen generator. Each speaker corresponds to a preset delay duration, and each speaker can play the anti-sound wave signal according to its corresponding preset delay duration.

[0104] In the embodiments of the present disclosure, the calculation formula of the preset delay duration can be as follows:

[0105] ti = di * c * cos(θ) Formula (2)

[0106] Wherein, ti is the preset delay duration, di is the distance between the i-th speaker and the target point, c is the speed of sound 343 m / s, θ is the angle between the normal direction of the i-th speaker and the connection line, and the connection line is the connection line between the i-th speaker and the target point.

[0107] In this way, the preset delay duration corresponding to each speaker can be calculated through the above Formula (2), so as to achieve the purpose of improving the noise reduction effect.

[0108] The embodiments of the present disclosure also provide an in-vehicle oxygen generator, which includes the noise reduction system described in any one of the above.

[0109] The technical solutions provided by the present disclosure at least include the following beneficial effects:

[0110] The present disclosure provides a noise reduction system, which can generate a corresponding anti-sound wave signal for the noise signal collected by the in-vehicle oxygen generator. After the noise reduction output device 3 plays the anti-sound wave signal, the anti-sound wave signal can cancel and neutralize the noise signal generated by the in-vehicle oxygen generator, thereby playing a targeted noise reduction role.

[0111] The above are only optional embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A noise reduction system, characterized in that, The noise reduction system is applied to an in-vehicle oxygen generator, and the noise reduction system includes a signal acquisition device (1), a signal processing device (2), and a noise reduction output device (3); The signal acquisition device (1) is used to acquire the noise signal corresponding to the in-vehicle oxygen generator and send the noise signal to the signal processing device (2); The signal processing device (2) is used to generate an anti-sound wave signal based on the noise signal and a preset noise reduction scheme, and send the anti-sound wave signal to the noise reduction output device (3); The noise reduction output device (3) is used to play the anti-sound wave signal to cancel the noise signal.

2. The noise reduction system according to claim 1, wherein The signal acquisition device (1) is also used to acquire the vibration spectrum data of the in-vehicle oxygen generator; The signal processing device (2) is used to: calculate the correlation coefficient between the vibration spectrum data and the noise signal, and if the correlation coefficient is greater than a preset coefficient threshold, generate the anti-sound wave signal.

3. The noise reduction system according to claim 1, wherein, The signal acquisition device (1) includes a first microphone and a second microphone; The first microphone is used to be installed outside the pipeline joint corresponding to the oxygen outlet of the in-vehicle oxygen generator to acquire a first part of the noise signal and send the first part of the noise signal to the signal processing device (2); The second microphone is used to be installed on the inner wall of the engine compartment of the compressor of the in-vehicle oxygen generator to acquire a second part of the noise signal and send the second part of the noise signal to the signal processing device (2); The signal processing device (2) is used to superimpose the first part of the noise signal and the second part of the noise signal to obtain the noise signal.

4. The noise reduction system according to claim 1, wherein The signal processing device (2) is used to: Generate the anti-sound wave signal based on the noise data and an adaptive filtering algorithm.

5. The noise reduction system according to claim 4, wherein The noise reduction system further includes an error microphone (4), and the error microphone (4) is used to acquire an error feedback signal and send the error feedback signal to the signal processing device (2); The signal processing device (2) is used to: When the error feedback signal meets the noise reduction condition, update the filter weights to obtain an updated adaptive filtering algorithm; Generate the anti-sound wave signal based on the noise data and the updated adaptive filtering algorithm.

6. The noise reduction system according to claim 5, characterized in that, The signal processing device (2) is used to: Obtain the current compressor speed and the current oxygen flow rate of the in-vehicle oxygen generator; Update the filter weights based on the current compressor speed and the current oxygen flow rate.

7. The noise reduction system according to claim 6, wherein The signal processing device (2) is used to: Based on the corresponding relationship between the compressor speed, the oxygen flow rate, and the step factor stored in the preset parameter table, determine the current step factor corresponding to the current compressor speed and the current oxygen flow rate; Update the filter weights based on the current step factor.

8. The noise reduction system according to claim 5, characterized in that, The noise reduction condition is that the sound pressure level of the error feedback signal is greater than a preset sound pressure level threshold.

9. The noise reduction system according to claim 1, wherein The noise reduction output device (3) is used to: Play the anti-sound wave signal when the duration after the signal acquisition device (1) acquires the noise signal reaches a preset delay duration.

10. An in-vehicle oxygen generator, characterized in that, The in-vehicle oxygen generator includes the noise reduction system according to any one of claims 1 to 9.

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