Multi-channel active noise reduction algorithm testing device based on synchronous acquisition card

Abstract

The invention relates to the technical field of electronics, in particular to a multichannel active noise reduction algorithm testing device based on a synchronous acquisition card, which comprises a signal generation module used for generating a test signal, an output module used for outputting the test signal and acquiring a recovery signal, and a loudspeaking module used for outputting a corresponding audio frequency, the system comprises an acquisition module used for acquiring audio and main noise in the environment and generating an acquisition signal, a synchronization module used for synchronizing the signal, a noise reduction module used for generating an anti-noise signal, an analysis module used for judging whether the noise reduction effect is qualified or not, judging the reason for not meeting the standard and generating a corresponding processing instruction, and a processing module used for processing the processing instruction. And the control module is used for adjusting the operation parameters of the parts in the corresponding module to corresponding values. The problem of signal delay caused by testing equipment is solved, the effect after noise reduction is monitored in real time, the operation parameters of the noise reduction device are accurately adjusted based on the effect after noise reduction, and the operation efficiency of the active noise reduction device is improved.

Description

Technical Field

[0001] The invention relates to the field of electronic technology, and in particular to a multi-channel active noise reduction algorithm testing device based on a synchronous acquisition card. Background Art

[0002] As an advanced noise control method, active noise reduction technology has been widely used in noise reduction headphones, aerospace, automobile manufacturing and other fields. This technology cancels out noise by generating sound waves with opposite phase and equal amplitude to the noise source, thereby reducing noise in a local area. With the development of technology, active noise reduction technology has become one of the research hotspots because it can more effectively process complex sound fields. Although active noise reduction technology has made significant progress in theoretical simulation, it still faces many challenges in practical applications. Active noise reduction technology needs to realize real-time processing functions, requiring signal processing and generating anti-noise signals in a very short time, which usually places high requirements on the processing speed of the processor, resulting in high costs. In order to avoid waste of resources, algorithm testing should be carried out before putting it into practical application to verify its effectiveness.

[0003] In recent years, deep learning algorithms have also begun to be applied to the field of active noise reduction, which further improves the noise reduction effect by learning noise patterns and generating more accurate anti-noise signals. The demand for active noise reduction algorithms based on deep learning is gradually increasing, which also increases the demand for testing such algorithms. However, during the testing phase, due to the high price of existing test equipment, it is difficult to conduct a comprehensive and effective evaluation of active noise reduction algorithms under existing conditions. In addition, test equipment often causes signal delay problems, which may cause the performance of active noise reduction systems to deteriorate. Therefore, it is of practical significance to provide an efficient and reliable active noise reduction algorithm test device to meet the growing research and development needs.

[0004] Chinese patent publication number: CN114157951 B, discloses an active noise reduction circuit and device. The active noise reduction circuit includes a filtering module and a signal feedback module. The input signal is first filtered by the filtering module to obtain a filtered signal, and the filtered signal is transmitted to the signal feedback module. The filtered signal is then amplified by the signal feedback module, and the amplified signal is transmitted to the filtering module for re-filtering, and the re-filtered signal is transmitted to the signal feedback module.

[0005] It can be seen that the above scheme transmits the amplified signal to the filtering module for re-filtering through the signal feedback module, and can obtain a re-filtered signal that is inversely proportional to the amplified signal, and then superimposes the filtered signal and the re-filtered signal through the signal feedback module, and can superimpose the filtered signal and the re-filtered signal that is inversely proportional to the filtered signal to reduce signal noise. However, the above scheme cannot solve the signal delay problem caused by the test equipment, cannot achieve real-time monitoring of the effect after noise reduction, and cannot achieve precise adjustment of the operating parameters of the noise reduction device based on the effect after noise reduction, and thus cannot guarantee the operating efficiency of the active noise reduction device. Summary of the invention

[0006] To this end, the present invention provides a multi-channel active noise reduction algorithm testing device based on a synchronous acquisition card, which is used to overcome the problem in the prior art that the signal delay problem caused by the test equipment cannot be solved, and the real-time monitoring of the effect after noise reduction and the precise adjustment of the operating parameters of the noise reduction device cannot be achieved, thereby overcoming the low operating efficiency of the active noise reduction device.

[0007] To achieve the above object, the present invention provides a multi-channel active noise reduction algorithm testing device based on a synchronous acquisition card, comprising:

[0008] A signal generating module, used for generating a test signal;

[0009] An output module, connected to the signal generating module, for outputting the test signal, and performing a sampling process to obtain a sampling signal during the process of outputting the test signal;

[0010] A speaker module connected to the output module, configured to output corresponding audio according to the received test signal;

[0011] A collection module, connected to the speaker module, for collecting the corresponding audio and main noise in the environment, and generating a collection signal;

[0012] A synchronization module, connected to the acquisition module, for synchronously processing the test signal and the acquisition signal to obtain a primary synchronization signal, and for unifying the lengths of the test signal, the acquisition signal and the acquisition signal to obtain a secondary synchronization signal;

[0013] A noise reduction module, connected to the synchronization module, for generating a corresponding anti-noise signal according to the secondary synchronization signal;

[0014] an analysis module connected to the acquisition module, for determining whether the noise reduction effect is qualified according to the test signal and the anti-noise signal collected and output by the speaker module, and determining the reason for not meeting the standard based on the test signal and the anti-noise signal; the analysis module is also used to generate corresponding processing instructions according to the determined reason for not meeting the standard;

[0015] A control module is connected to the analysis module and is used to adjust the operating parameters of the components in the corresponding module to corresponding values ​​based on the corresponding processing instructions.

[0016] Furthermore, the noise reduction module is used to generate the corresponding anti-noise signal according to the secondary synchronization signal combined with the impulse response of the secondary path, the impulse response of the secondary path is obtained by processing the white noise synchronization signal through the noise reduction module, and the white noise synchronization signal is obtained by synchronizing the white noise signal through the synchronization module.

[0017] Furthermore, the analysis module is used to determine the volume of the test signal after noise reduction based on the noise reduction signal generated by the test signal and the anti-noise signal, and to determine whether the noise reduction effect is qualified according to the interval in which the volume after noise reduction is located, and to determine whether the standard of the interval in which the volume after noise reduction needs to be corrected based on the noise reduction ratio when the noise reduction effect is determined to be unqualified, or to determine the reason for the unqualified noise reduction effect based on the volume difference; wherein the noise reduction ratio is the ratio of the volume before noise reduction to the volume after noise reduction, the volume before noise reduction is determined by the analysis module based on the test signal, and the volume difference is the difference between the volume after noise reduction and the preset volume after noise reduction pre-stored in the analysis module.

[0018] Furthermore, the analysis module is also used to determine whether it is necessary to correct the standard of the interval of the volume after noise reduction based on the noise reduction ratio, and to increase the standard of the interval of the volume after noise reduction based on the noise reduction ratio according to the determination result, or to determine the reason why the noise reduction effect is unsatisfactory based on the volume difference.

[0019] Furthermore, the analysis module is also used to increase the standard of the interval in which the volume after noise reduction is located based on the noise reduction ratio difference, and the increase in the standard of the interval in which the volume after noise reduction is located is proportional to the noise reduction ratio difference; wherein the noise reduction ratio difference is the difference between the noise reduction ratio and a preset noise reduction ratio pre-stored in the analysis module.

[0020] Furthermore, the analysis module is also used to determine the reason why the noise reduction effect is unsatisfactory based on the volume difference, and to generate a corresponding processing method based on the determined reason, including: correcting the delay between the test signal and the recovery signal based on the time delay amount when it is determined that there is a delay between the test signal and the recovery signal, or, correcting the amplification factor of the speaker module during the test signal output process based on the volume difference when it is determined that the amplification factor of the speaker module during the test signal output process does not meet the standard; wherein the time delay amount is the time delay amount of the recovery signal relative to the test signal.

[0021] Furthermore, the analysis module is also used to correct the delay between the test signal and the recovery signal based on the time delay, and to generate a corresponding processing method based on the determined cause, including: the test signal moves to the right when the time delay is less than zero, and the test signal moves to the left when the time delay is greater than zero.

[0022] Furthermore, after completing the movement of the test signal, the synchronization module calculates the minimum length of the test signal, the sampling signal and the acquisition signal, and unifies the lengths of the test signal, the sampling signal and the acquisition signal to obtain the secondary synchronization signal.

[0023] Furthermore, the analysis module is also used to reduce the amplification factor of the speaker module during the output of the test signal based on the volume difference ratio, and the reduction in the amplification factor is proportional to the volume difference ratio; wherein the volume difference ratio is the ratio of the volume difference to a preset volume difference pre-stored in the analysis module.

[0024] Furthermore, the analysis module is also used to re-determine whether the noise reduction effect is qualified after the adjustment of the amplification factor is completed, and, when the reason for the unqualified noise reduction effect is re-determined and the reason for the unqualified is that the placement of the speaker module that outputs the test signal does not meet the standard, increase the placement distance between the speaker module that outputs the test signal and the acquisition module based on the volume difference and issue a corresponding notification, and the increase in the placement distance is proportional to the volume difference.

[0025] Compared with the prior art, the beneficial effect of the present invention lies in that, by setting a synchronization module and an analysis module, the synchronization module is used to synchronously process the test signal and the collected signal to obtain a primary synchronization signal and unify the length of the test signal, the collected signal and the collected signal to obtain a secondary synchronization signal, thereby solving the problem of time delay between the playback and collection of the test signal and effectively solving the signal delay problem caused by the test equipment; the analysis module is used to determine whether the noise reduction effect is qualified based on the interval of the acquired volume after noise reduction, and can quickly and accurately complete the determination of whether the noise reduction effect is qualified, effectively realizing real-time monitoring of the effect after noise reduction; at the same time, based on the volume before noise reduction and the volume after noise reduction, determining the reason for not meeting the standard, the analysis module is also used to generate corresponding processing instructions according to the determined reason for not meeting the standard, effectively realizing precise adjustment of the operating parameters of the noise reduction device based on the effect after noise reduction, ensuring the accuracy of the operating parameters of the noise reduction device, and effectively improving the operating efficiency of the active noise reduction device.

[0026] Furthermore, the noise reduction module provided in the present invention is used to generate a corresponding anti-noise signal according to the secondary synchronization signal combined with the impulse response of the secondary path, and further improves the noise reduction effect by learning the noise pattern and generating a more accurate anti-noise signal, thereby further improving the operating efficiency of the active noise reduction device.

[0027] Furthermore, the analysis module provided in the present invention is also used to determine whether it is necessary to correct the standard of the interval of the volume after noise reduction based on the noise reduction ratio, so as to more accurately determine the noise reduction effect and avoid the occurrence of misjudgment. While further realizing real-time monitoring of the effect after noise reduction, it further improves the operating efficiency of the active noise reduction device.

[0028] Furthermore, the analysis module provided in the present invention is also used to increase the standard of the interval in which the volume after noise reduction is located based on the noise reduction ratio difference, which can avoid the occurrence of misjudgment of whether the noise reduction effect is qualified due to the standard of the interval in which the volume after noise reduction is located not meeting the standard, thereby effectively ensuring the accuracy of the result of determining whether the noise reduction effect is qualified, while further realizing real-time monitoring of the effect after noise reduction, and further improving the operating efficiency of the active noise reduction device.

[0029] Furthermore, the analysis module provided in the present invention is also used to determine the reason why the noise reduction effect is unqualified based on the volume difference, and can quickly and accurately determine the reason why the noise reduction effect is unqualified. While further realizing real-time monitoring of the effect after noise reduction, it further improves the operating efficiency of the active noise reduction device.

[0030] Furthermore, the analysis module provided in the present invention is also used to correct the delay between the test signal and the recovered signal based on the time delay amount, thereby avoiding the occurrence of unsatisfactory noise reduction effect caused by signal asynchrony. While further realizing the precise adjustment of the operating parameters of the noise reduction device based on the effect after noise reduction, the operating efficiency of the active noise reduction device is further improved.

[0031] Furthermore, after completing the movement of the test signal, the synchronization module provided in the present invention unifies the length of the test signal, the return signal and the acquisition signal to obtain a secondary synchronization signal, so as to avoid a time delay between the test signal playback and acquisition, thereby further improving the operating efficiency of the active noise reduction device.

[0032] Furthermore, the analysis module provided in the present invention is also used to reduce the amplification factor of the speaker module during the test signal output process based on the volume difference ratio, effectively avoiding the occurrence of unqualified noise reduction effect due to the amplification factor not meeting the standard, while further realizing the precise adjustment of the operating parameters of the noise reduction device based on the effect after noise reduction, and further improving the operating efficiency of the active noise reduction device.

[0033] Furthermore, the analysis module provided in the present invention is also used to re-determine the reason for the unqualified noise reduction effect after the amplification factor is reduced, and can accurately determine whether the placement of the playback module meets the standards, further realizing real-time monitoring of the effect after noise reduction. When it is determined that the placement of the speaker module that outputs the test signal does not meet the standards, the placement distance between the speaker module that outputs the test signal and the acquisition module is increased based on the volume difference and a corresponding notification is issued, so as to timely and accurately adjust the placement distance, effectively avoiding the occurrence of unqualified noise reduction effect due to the placement distance not meeting the standards, while further realizing the precise adjustment of the operating parameters of the noise reduction device based on the effect after noise reduction, and further improving the operating efficiency of the active noise reduction device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural block diagram of a multi-channel active noise reduction algorithm testing device based on a synchronous acquisition card of the present invention;

[0035] Figure 2 This is a working flow chart of a multi-channel active noise reduction algorithm testing device based on a synchronous acquisition card of the present invention;

[0036] Figure 3 A flow chart of the standard for determining whether the noise reduction effect is qualified and whether the interval of the volume after noise reduction needs to be corrected according to the present invention;

[0037] Figure 4 The flowchart of the present invention is used to determine the reason why the noise reduction effect is unqualified. DETAILED DESCRIPTION

[0038] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0040] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0041] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] See also Figure 1 As shown, it is a structural block diagram of a multi-channel active noise reduction algorithm test device based on a synchronous acquisition card of the present invention. The system of the embodiment of the present invention includes a signal generation module, an output module, a speaker module, an acquisition module, a synchronization module, a noise reduction module, an analysis module and a control module, wherein:

[0043] The signal generating module is used to generate a test signal;

[0044] The output module is connected to the signal generating module, and is used to output the test signal, and to perform a sampling process in the process of outputting the test signal to obtain a sampling signal;

[0045] The speaker module is connected to the output module and is used to output corresponding audio according to the received test signal;

[0046] The acquisition module is connected to the speaker module to acquire the corresponding audio and main noise in the environment and generate an acquisition signal;

[0047] The synchronization module is connected to the acquisition module, and is used to synchronously process the test signal and the acquisition signal to obtain a primary synchronization signal, and to unify the lengths of the test signal, the acquisition signal and the acquisition signal to obtain a secondary synchronization signal;

[0048] The noise reduction module is connected to the synchronization module, and is used to generate a corresponding anti-noise signal according to the secondary synchronization signal;

[0049] The analysis module is connected to the acquisition module, and is used to determine whether the noise reduction effect is qualified according to the collected test signal and the anti-noise signal output by the speaker module, and to determine the reason for not meeting the standard based on the test signal and the anti-noise signal; the analysis module is also used to generate corresponding processing instructions according to the determined reason for not meeting the standard;

[0050] The control module is connected to the analysis module and is used to adjust the operating parameters of the components in the corresponding module to corresponding values ​​based on the corresponding processing instructions.

[0051] See also Figure 2 As shown, it is a workflow diagram of the multi-channel active noise reduction algorithm test device based on the synchronous acquisition card of the present invention. When the multi-channel active noise reduction algorithm test device based on the synchronous acquisition card described in the embodiment of the present invention is running, the signal generation module is used to generate the test signal, the output module is used to output the test signal and perform a sampling process in the process of outputting the test signal to obtain the sampling signal, the speaker module is used to output the corresponding audio according to the received test signal, the acquisition module is used to collect the corresponding audio and the main noise in the environment and generate the acquisition signal, the synchronization module is used to synchronize the test signal and the sampling signal to obtain the primary synchronization signal, and the length of the test signal, the sampling signal and the acquisition signal is unified to obtain the secondary synchronization signal The noise reduction module is used to generate the corresponding anti-noise signal according to the secondary synchronization signal. The primary speaker and the secondary speaker of the speaker module synchronously play the test signal and the anti-noise signal. The acquisition module acquires the test signal, the anti-noise signal and the noise reduction signal generated by the test signal and the anti-noise signal played by the speaker module. The analysis module is used to determine whether the noise reduction effect is qualified according to the test signal and the anti-noise signal and determine the reason for not meeting the standard based on the test signal and the anti-noise signal. The analysis module is also used to generate corresponding processing instructions according to the determined reason for not meeting the standard. The control module is used to adjust the operating parameters of the components in the corresponding module to corresponding values ​​based on the corresponding processing instructions.

[0052] Please continue reading Figure 2As shown, the noise reduction module in the embodiment of the present invention is used to generate the corresponding anti-noise signal according to the secondary synchronization signal combined with the impulse response of the secondary path, and the impulse response of the secondary path is obtained by processing the white noise synchronization signal through the noise reduction module, and the white noise synchronization signal is obtained by synchronizing the white noise signal through the synchronization module.

[0053] See also Figure 3 As shown, it is a flowchart of the standard for determining whether the noise reduction effect is qualified and whether the interval of the volume after noise reduction needs to be corrected in the present invention. The analysis module of the embodiment of the present invention is used to determine the volume after noise reduction for the test signal based on the noise reduction signal generated by the test signal and the anti-noise signal, and determine whether the noise reduction effect is qualified according to the interval of the volume after noise reduction:

[0054] When the volume after noise reduction is less than or equal to the first preset volume after noise reduction V1 set in the analysis module, it is determined that the noise reduction effect is qualified, the operation of the multi-channel active noise reduction algorithm test device based on the synchronous acquisition card meets the standard, and the noise reduction test is completed, wherein the first preset volume after noise reduction V1 in this embodiment is 30dB;

[0055] When the volume after noise reduction is greater than the first preset volume after noise reduction V1 and less than or equal to the second preset volume after noise reduction V2 set in the analysis module, it is determined that the noise reduction effect is unqualified, and whether the standard of the interval of the volume after noise reduction needs to be corrected is determined based on the noise reduction ratio, wherein, in this embodiment, the second preset volume after noise reduction V2=33dB, the noise reduction ratio is the ratio of the volume before noise reduction to the volume after noise reduction, and the volume before noise reduction is determined by the analysis module based on the test signal;

[0056] When the volume after noise reduction is greater than the second preset volume V2 after noise reduction, it is determined that the noise reduction effect is unqualified, and the reason for the unqualified noise reduction effect is determined based on the volume difference, wherein the volume difference is the difference between the volume after noise reduction and the second preset volume after noise reduction.

[0057] Please continue reading Figure 3 As shown, the analysis module in the embodiment of the present invention is further used to determine whether the interval of the volume after noise reduction needs to be corrected based on the noise reduction ratio:

[0058] When the noise reduction ratio is greater than or equal to a preset noise reduction ratio R set in the analysis module, it is determined that the standard of the interval of the volume after noise reduction needs to be corrected, and the standard of the interval of the volume after noise reduction is increased based on the noise reduction ratio, wherein the preset noise reduction ratio R in this embodiment is 1.67;

[0059] When the noise reduction ratio is less than the preset noise reduction ratio R, it is determined that there is no need to correct the standard of the interval in which the volume after noise reduction is located, and the reason why the noise reduction effect is unqualified is determined based on the volume difference.

[0060] Please continue reading Figure 3 As shown, the analysis module in the embodiment of the present invention is further used to increase the standard of the interval of the volume after noise reduction based on the noise reduction ratio difference, wherein the noise reduction ratio difference is the difference between the noise reduction ratio and the preset noise reduction ratio:

[0061] When the noise reduction ratio difference is greater than the second preset noise reduction ratio difference △D2 set in the analysis module, the standard of the interval of the volume after noise reduction is increased to 1.11 times the standard of the interval of the volume after initial noise reduction, wherein the second preset noise reduction ratio difference △D2 in this embodiment is 0.75;

[0062] When the noise reduction ratio difference is less than or equal to the second preset dirty noise reduction ratio difference △D2 and greater than the first preset dirty noise reduction ratio difference △D1 set in the analysis module, the standard of the interval of the volume after noise reduction is increased to 1.07 times the standard of the interval of the volume after initial noise reduction, wherein the first preset dirty noise reduction ratio difference △D1 in this embodiment is 0.45;

[0063] When the noise reduction ratio difference is less than or equal to the first preset noise reduction ratio difference ΔD1, the standard of the interval of the volume after noise reduction is increased to 1.03 times the standard of the interval of the volume after initial noise reduction.

[0064] See also Figure 4 As shown, it is a flow chart of determining the reason why the noise reduction effect is unqualified in the present invention. The analysis module in the embodiment of the present invention is also used to determine the reason why the noise reduction effect is unqualified based on the volume difference, and generate a corresponding processing method based on the determined reason:

[0065] When the volume difference is greater than or equal to a preset volume difference ΔE set in the analysis module, it is determined that there is a delay between the test signal and the recovery signal, and the delay between the test signal and the recovery signal is corrected based on the time delay amount, wherein the preset volume difference ΔE in this embodiment is 2.5 dB, and the time delay amount is the delay amount of the recovery signal relative to the time of the test signal;

[0066] When the volume difference is less than the preset volume difference ΔE, it is determined that the amplification factor of the speaker module during the test signal output process does not meet the standard, and the amplification factor of the speaker module during the test signal output process is corrected based on the volume difference.

[0067] Please continue reading Figure 4As shown, the analysis module in the embodiment of the present invention is also used to correct the delay between the test signal and the sampling signal based on the time delay, and to generate a corresponding processing method based on the determined cause:

[0068] When the time delay is less than zero, it is determined that the sampling signal leads the test signal by the time delay by samples, and the test signal moves to the right;

[0069] When the time delay is greater than zero, it is determined that the test signal leads the acquisition signal by the time delay number of samples, and the test signal moves to the left.

[0070] Please continue reading Figure 4 As shown, after completing the movement of the test signal, the synchronization module of the embodiment of the present invention calculates the minimum length of the test signal, the sampling signal and the acquisition signal, and unifies the length of the test signal, the sampling signal and the acquisition signal to obtain the secondary synchronization signal.

[0071] Please continue reading Figure 4 As shown, the analysis module in the embodiment of the present invention is further used to reduce the amplification factor of the speaker module in the process of outputting the test signal based on the volume difference ratio, wherein the volume difference ratio is the ratio of the volume difference to the preset volume difference:

[0072] When the volume difference ratio is greater than a second preset volume difference ratio △A2 set in the analysis module, the amplification factor is reduced to 0.53 times of the initial amplification factor, wherein the second preset volume difference ratio △A2 in this embodiment is 97.2%;

[0073] When the volume difference ratio is less than or equal to the second preset volume difference ratio △A2 and greater than the first preset volume difference ratio △A1 set in the analysis module, the amplification factor is reduced to 0.59 times of the initial amplification factor, wherein the first preset volume difference ratio △A1 in this embodiment is 94.3%;

[0074] When the volume difference ratio is less than or equal to the first preset volume difference ratio ΔA1, the amplification factor is reduced to 0.66 times of the initial amplification factor.

[0075] Please continue reading Figure 4 As shown, the analysis module in the embodiment of the present invention is also used to re-determine whether the noise reduction effect is qualified after the adjustment of the magnification is completed, and to re-determine the reason why the noise reduction effect is unqualified:

[0076] When the volume difference is less than or equal to the preset volume difference ΔE, it is determined that the placement of the speaker module that outputs the test signal does not meet the standard, and the placement distance between the speaker module that outputs the test signal and the acquisition module is increased based on the volume difference and a corresponding notification is issued;

[0077] When the volume difference is greater than a second preset volume difference △F2 set in the analysis module, the placement spacing is increased to 1.89 times of the initial placement spacing, and a notification is issued, wherein the second preset volume difference △F2 in this embodiment is 1.5 dB;

[0078] When the volume difference is less than or equal to the second preset volume difference F2 and greater than the first preset volume difference △F1 set in the analysis module, the placement spacing is increased to 1.69 times of the initial placement spacing, and a notification is issued, wherein the first preset volume difference △F1 in this embodiment is 0.5dB;

[0079] When the volume difference is less than or equal to the first preset volume difference ΔF1, the placement spacing is increased to 1.51 times the initial placement spacing, and a notification is issued.

[0080] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-channel active noise reduction algorithm test device based on a synchronous acquisition card, characterized in that: include: A signal generating module, used for generating a test signal; An output module, connected to the signal generating module, for outputting the test signal, and performing a sampling process to obtain a sampling signal during the process of outputting the test signal; A speaker module connected to the output module, configured to output corresponding audio according to the received test signal; A collection module, connected to the speaker module, for collecting the corresponding audio and main noise in the environment, and generating a collection signal; A synchronization module, connected to the acquisition module, for synchronously processing the test signal and the acquisition signal to obtain a primary synchronization signal, and for unifying the lengths of the test signal, the acquisition signal and the acquisition signal to obtain a secondary synchronization signal; A noise reduction module, connected to the synchronization module, for generating a corresponding anti-noise signal according to the secondary synchronization signal; an analysis module connected to the acquisition module, for determining whether the noise reduction effect is qualified according to the test signal and the anti-noise signal collected and output by the speaker module, and determining the reason for not meeting the standard based on the test signal and the anti-noise signal; the analysis module is also used to generate corresponding processing instructions according to the determined reason for not meeting the standard; A control module is connected to the analysis module and is used to adjust the operating parameters of the components in the corresponding module to corresponding values ​​based on the corresponding processing instructions.

2. The multi-channel active noise reduction algorithm testing device based on synchronous acquisition card according to claim 1, characterized in that: The noise reduction module is used to generate the corresponding anti-noise signal according to the secondary synchronization signal combined with the impulse response of the secondary path. The impulse response of the secondary path is obtained by processing the white noise synchronization signal through the noise reduction module, and the white noise synchronization signal is obtained by synchronizing the white noise signal through the synchronization module.

3. The multi-channel active noise reduction algorithm testing device based on synchronous acquisition card according to claim 1, characterized in that: The analysis module is used to determine the volume of the test signal after noise reduction based on the noise reduction signal generated by the test signal and the anti-noise signal, and to determine whether the noise reduction effect is qualified according to the interval in which the volume after noise reduction is located, and to determine whether it is necessary to correct the standard of the interval in which the volume after noise reduction is located based on the noise reduction ratio when the noise reduction effect is determined to be unqualified, or to determine the reason for the unqualified noise reduction effect based on the volume difference; wherein the noise reduction ratio is the ratio of the volume before noise reduction to the volume after noise reduction, the volume before noise reduction is determined by the analysis module based on the test signal, and the volume difference is the difference between the volume after noise reduction and the preset volume after noise reduction pre-stored in the analysis module.

4. The multi-channel active noise reduction algorithm testing device based on synchronous acquisition card according to claim 2, characterized in that: The analysis module is also used to determine whether it is necessary to correct the standard of the interval of the volume after noise reduction based on the noise reduction ratio, and to increase the standard of the interval of the volume after noise reduction based on the noise reduction ratio according to the determination result, or to determine the reason why the noise reduction effect is unsatisfactory based on the volume difference.

5. The multi-channel active noise reduction algorithm testing device based on synchronous acquisition card according to claim 4 is characterized in that: The analysis module is also used to increase the standard of the interval in which the volume after noise reduction is located based on the noise reduction ratio difference, and the increase in the standard of the interval in which the volume after noise reduction is located is proportional to the noise reduction ratio difference; wherein the noise reduction ratio difference is the difference between the noise reduction ratio and a preset noise reduction ratio pre-stored in the analysis module.

6. The multi-channel active noise reduction algorithm testing device based on synchronous acquisition card according to claim 4, characterized in that: The analysis module is also used to determine the reason why the noise reduction effect is unsatisfactory based on the volume difference, and to generate a corresponding processing method based on the determined reason, including: correcting the delay between the test signal and the collected signal based on the time delay when it is determined that there is a delay between the test signal and the collected signal, or correcting the amplification factor of the speaker module during the test signal output process based on the volume difference when it is determined that the amplification factor of the speaker module during the test signal output process does not meet the standard; wherein the time delay factor is the time delay factor of the collected signal relative to the test signal.

7. The multi-channel active noise reduction algorithm testing device based on synchronous acquisition card according to claim 6, characterized in that: The analysis module is also used to correct the delay between the test signal and the recovery signal based on the time delay, and to generate a corresponding processing method based on the determined cause, including: the test signal moves to the right when the time delay is less than zero, and the test signal moves to the left when the time delay is greater than zero.

8. The multi-channel active noise reduction algorithm testing device based on synchronous acquisition card according to claim 7, characterized in that: After completing the movement of the test signal, the synchronization module calculates the minimum length of the test signal, the sampling signal and the acquisition signal, and unifies the lengths of the test signal, the sampling signal and the acquisition signal to obtain the secondary synchronization signal.

9. The multi-channel active noise reduction algorithm testing device based on synchronous acquisition card according to claim 6, characterized in that: The analysis module is also used to reduce the amplification factor of the speaker module during the output of the test signal based on the volume difference ratio, and the reduction in the amplification factor is proportional to the volume difference ratio; wherein the volume difference ratio is the ratio of the volume difference to a preset volume difference pre-stored in the analysis module.

10. The multi-channel active noise reduction algorithm testing device based on synchronous acquisition card according to claim 9, characterized in that: The analysis module is also used to re-determine whether the noise reduction effect is qualified after the adjustment of the amplification factor is completed, and, when the reason for the unqualified noise reduction effect is re-determined and the reason for the unqualified noise reduction effect is that the placement of the speaker module that outputs the test signal does not meet the standard, increase the placement distance between the speaker module that outputs the test signal and the acquisition module based on the volume difference and issue a corresponding notification, and the increase in the placement distance is proportional to the volume difference.

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