CN108461078B - Method and device for masking high-frequency noise of motor - Google Patents
Method and device for masking high-frequency noise of motor Download PDFInfo
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Abstract
The invention discloses a method and a device for masking high-frequency noise of a motor, wherein the method comprises the following steps: generating a masking curve function based on a high-frequency noise signal generated by the motor; collecting high-frequency noise signals generated by a motor in real time; generating a masking sound signal according to the frequency spectrum data of the collected high-frequency noise signal and a masking curve function, selecting background sound from a background sound database according to the frequency spectrum data of the collected high-frequency noise signal, and processing the selected background sound according to the masking curve function; and synthesizing the generated masking sound signal and the selected background sound and outputting the synthesized masking sound signal. The masking method for the high-frequency noise of the motor can mask the high-frequency noise signal generated by the motor, so that the high-frequency noise signal is expressed by a background sound which is pleasant to accept by people, and the use experience of people on related products of the motor is promoted.
Description
Technical Field
The invention relates to the technical field of noise control, in particular to a method and a device for masking high-frequency noise of a motor.
Background
With the rapid development of new energy industries, more and more new energy products related to motors appear in our lives. But the new energy product brings convenience to our life and simultaneously brings trouble of motor noise to our.
The high-frequency noise of the motor is a comprehensive noise including mechanical noise, electromagnetic noise and air noise, and the frequency is from 1KHz to 12KHz or higher, and the high-frequency noise can bring strong discomfort to people, so that the noise is very necessary to be treated.
In the related art, there are two main schemes for controlling motor noise: one is passive noise reduction, which includes structural optimization, resonance elimination, and sound absorption and insulation by damping materials, for example, the traditional sound insulation, sound absorption and silencing materials are adopted to achieve the effect of noise reduction. However, passive noise reduction is limited by the heat dissipation index of the motor, and can only be adopted in a limited way, and the high-frequency noise of the motor still cannot meet the ideal requirement. The other is active noise reduction, which performs phase cancellation on low-frequency motor noise. However, since the frequency of the motor noise is high and the wavelength is short, it is difficult to capture the phase of the motor noise to generate an opposite-phase sound wave to actively cancel the noise. Even if the capture can be realized, the search step length is continuously adjusted, so that the cycle number is very large, the calculation amount is large, and the algorithm is difficult to realize; even if the algorithm can be implemented, the hardware requirements are high and the cost is high.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, an object of the present invention is to provide a method for masking high frequency noise of a motor. The method can mask the high-frequency noise signals generated by the motor, so that the high-frequency noise signals are presented by a background sound which is easy to accept by people, and the use experience of people on motor related products is promoted.
The invention also aims to provide a device for masking the high-frequency noise of the motor.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for masking high-frequency noise of a motor, including the following steps: generating a masking curve function based on a high-frequency noise signal generated by the motor; collecting high-frequency noise signals generated by the motor in real time; generating a masking sound signal according to the frequency spectrum data of the collected high-frequency noise signal and the masking curve function, selecting background sound from a background sound database according to the frequency spectrum data of the collected high-frequency noise signal, and processing the selected background sound according to the masking curve function; and synthesizing the generated masking sound signal and the processed background sound and outputting the synthesized masking sound signal.
The masking method of the high-frequency noise of the motor in the embodiment of the invention generates a masking curve function in advance based on the high-frequency noise signal generated by the motor, collects the high-frequency noise signal generated by the motor in real time when masking the high-frequency noise signal, generates a masking sound signal according to the frequency spectrum data of the collected high-frequency noise signal and the masking curve function, selects a background sound from a background sound database according to the frequency spectrum data of the collected high-frequency noise signal, processes the selected background sound according to the masking curve function, and then synthesizes the generated masking sound signal with the processed background sound and outputs the synthesized masking sound. Therefore, high-frequency noise signals generated by the motor can be masked, so that the high-frequency noise signals are displayed by background sound which is happy to be accepted by people, and the use experience of people on motor related products is promoted.
According to an embodiment of the invention, the spectral data comprises a frequency and a sound pressure level of the high frequency noise signal, wherein the generating of the masking sound signal from the spectral data of the high frequency noise signal and a masking curve function comprises: determining the frequency of a masking sound signal according to the frequency of the high-frequency noise signal and the masking curve function; generating the masking sound signal according to a frequency of the masking sound signal.
According to an embodiment of the present invention, selecting a background sound from a background sound database, and processing the selected background sound according to the masking curve function, includes: selecting background sound from a background sound database according to the frequency of the high-frequency signal; determining a reference sound pressure level according to the sound pressure level of the high-frequency noise signal and the masking curve function; and processing the background sound selected from the background sound database according to the reference sound pressure level.
According to one embodiment of the invention, the generating of the masking curve function based on the high frequency noise signal generated by the motor comprises the following steps: selecting the frequency of a masking signal according to the collected high-frequency noise signal, and adjusting the sound pressure level of the masking signal; acquiring the sound pressure level of the masking signal for masking the high-frequency noise signal; modeling to obtain the masking curve function based on frequencies of a plurality of high frequency signals, a frequency of a masking signal, and a sound pressure level of the masking signal masking out the high frequency noise signal.
According to an embodiment of the present invention, the generating a masking curve function based on the high frequency noise signal generated by the motor further comprises the steps of: selecting the sound pressure level of a masking signal according to the collected high-frequency noise signal, and adjusting the frequency of the masking signal; acquiring the frequency of the masking signal for masking the high-frequency noise signal; modeling to obtain the masking curve function based on frequencies of a plurality of high frequency signals, a sound pressure level of a masking signal, and a frequency of the masking signal masking out the high frequency noise signal.
According to an embodiment of the present invention, the generating a masking sound signal according to a frequency of the masking signal includes: and filtering the high-frequency noise signal through an LMS (Least Mean Square) adaptive filter according to the frequency of the masking sound signal to generate the masking sound signal.
According to an embodiment of the invention, the background sound comprises a first type of background sound and a second type of background sound.
According to an embodiment of the present invention, selecting a background sound from a background sound database according to a frequency of the high frequency signal includes: judging whether the frequency of the high-frequency noise signal is stable or not; if the frequency of the high-frequency noise signal is unstable, selecting the first type of background sound according to the rotating speed of the motor; selecting the second type of background sound if the frequency of the high frequency noise signal is stable.
According to an embodiment of the invention, the sound pressure level of the background sound in the background sound database ranges from 40dB to 65 dB.
In order to achieve the above object, a second embodiment of the present invention provides a device for masking high frequency noise of a motor, including: the pre-generation unit is used for generating a masking curve function based on a high-frequency noise signal generated by the motor; the acquisition unit is used for acquiring a high-frequency noise signal generated by the motor in real time; the signal generating unit is used for generating a masking sound signal according to the frequency spectrum data of the collected high-frequency noise signal and the masking curve function; the selection processing unit is used for selecting background sound from a background sound database according to the acquired frequency spectrum data of the high-frequency noise signal and processing the selected background sound according to the masking curve function; and the synthesis output unit is used for synthesizing the generated masking sound signal and the processed background sound and outputting the synthesized masking sound signal.
The masking device for the high-frequency noise of the motor in the embodiment of the invention generates a masking curve function in advance through the pre-generation unit based on the high-frequency noise signal generated by the motor, acquires the high-frequency noise signal generated by the motor in real time through the acquisition unit when the high-frequency noise signal is masked, generates a masking sound signal according to the frequency spectrum data of the acquired high-frequency noise signal and the masking curve function through the signal generation unit, selects a background sound from a background sound database according to the frequency spectrum data of the acquired high-frequency noise signal through the selection processing unit, processes the selected background sound according to the masking curve function, and then synthesizes and outputs the generated masking sound signal and the processed background sound through the synthesis output unit. Therefore, high-frequency noise signals generated by the motor can be masked, so that the high-frequency noise signals are displayed by background sound which is happy to be accepted by people, and the use experience of people on motor related products is promoted.
According to an embodiment of the invention, the spectral data comprises a frequency and a sound pressure level of the high frequency noise signal, wherein the signal generation unit is specifically configured to: determining the frequency of a masking sound signal according to the frequency of the high-frequency noise signal and the masking curve function; generating the masking sound signal according to a frequency of the masking sound signal.
According to an embodiment of the present invention, the selection processing unit is specifically configured to: selecting background sound from the background sound database according to the frequency of the high-frequency signal; determining a reference sound pressure level according to the sound pressure level of the high-frequency noise signal and the masking curve function; and processing the background sound selected from the background sound database according to the reference sound pressure level.
According to an embodiment of the present invention, the pre-generation unit is specifically configured to: selecting the frequency of a masking signal according to the collected high-frequency noise signal, and adjusting the sound pressure level of the masking signal; acquiring the sound pressure level of the masking signal for masking the high-frequency noise signal; modeling to obtain the masking curve function based on frequencies of a plurality of high frequency signals, a frequency of a masking signal, and a sound pressure level of the masking signal masking out the high frequency noise signal.
According to an embodiment of the present invention, the pre-generation unit is further specifically configured to: selecting the sound pressure level of a masking signal according to the collected high-frequency noise signal, and adjusting the frequency of the masking signal; acquiring the frequency of the masking signal for masking the high-frequency noise signal; modeling to obtain the masking curve function based on frequencies of a plurality of high frequency signals, a sound pressure level of a masking signal, and a frequency of the masking signal masking out the high frequency noise signal.
According to an embodiment of the present invention, when the signal generating unit generates the masking sound signal according to the frequency of the masking sound signal, the signal generating unit is specifically configured to: and filtering the high-frequency noise signal through an LMS adaptive filter according to the frequency of the masking sound signal to generate the masking sound signal.
According to an embodiment of the invention, the background sound comprises a first type of background sound and a second type of background sound.
According to an embodiment of the present invention, when the selection processing unit selects the background sound from the background sound database according to the frequency of the high-frequency signal, the selection processing unit is specifically configured to: judging whether the frequency of the high-frequency noise signal is stable or not; if the frequency of the high-frequency noise signal is unstable, selecting the first type of background sound according to the rotating speed of the motor; selecting the second type of background sound if the frequency of the high frequency noise signal is stable.
According to an embodiment of the invention, the sound pressure level of the background sound in the background sound database ranges from 40dB to 65 dB.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a method of masking high frequency noise of a motor according to one embodiment of the present invention;
FIG. 2 is a flow diagram of a method of building a background sound database according to one embodiment of the invention;
FIG. 3 is a schematic view of the hearing threshold in a quiet environment according to an embodiment of the present invention;
FIG. 4 is a flow diagram of a method of generating a masking curve function according to one embodiment of the present invention;
FIG. 5 is a flow diagram of a method of generating a masking curve function according to another embodiment of the present invention;
FIG. 6 is a flow chart of a method of producing a masking sound signal according to one embodiment of the present invention;
fig. 7 is a schematic diagram of a method of generating a first type of background sound according to a specific example of the present invention;
FIG. 8 is an operational flow diagram of a method of masking high frequency noise of a motor according to one embodiment of the present invention; and
fig. 9 is a block diagram of a masking apparatus for high frequency noise of a motor according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The method and apparatus for masking high frequency noise of a motor according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a flowchart of a masking method of high frequency noise of a motor according to an embodiment of the present invention. As shown in fig. 1, the method for masking high-frequency noise of a motor includes:
and S1, generating a masking curve function based on the high-frequency noise signal generated by the motor.
The masking curve function is a relation function between the high-frequency noise signal and a masking signal masking the high-frequency noise signal, and the masking signal corresponding to the high-frequency noise signal can be obtained through the high-frequency noise signal.
And S2, acquiring a high-frequency noise signal generated by the motor in real time.
In particular, the high-frequency noise signal of the motor can be collected in real time through a sound signal receiver (such as a microphone and the like) and/or a rotating speed sensor. For a motor with a relatively constant load, a high-frequency noise signal can be acquired only by using a rotating speed sensor; for the motor with larger load change, the high-frequency noise signal can be simultaneously acquired through the rotating speed sensor and the sound signal receiver, so that the acquisition precision of the high-frequency noise signal is improved.
It can be understood that when the motor rotates, the corresponding relationship exists between the rotating speed and the high-frequency noise signal, so that the corresponding relationship between the rotating speed and the high-frequency noise signal can be stored in advance, and further the rotating speed of the motor can be detected through the rotating speed sensor to obtain the corresponding high-frequency noise signal.
And S3, generating a masking sound signal according to the frequency spectrum data of the collected high-frequency noise signal and the masking curve function, selecting a background sound from the background sound database according to the frequency spectrum data of the collected high-frequency noise signal, and processing the selected background sound according to the masking curve function.
In an embodiment of the present invention, the masking signal for masking the high-frequency noise signal includes a masking sound signal and a processed background sound selected from a background sound database.
The background sound in the background sound database can be sound which can be accepted by human ears and is comfortable to feel, the frequency can be 500-1000 Hz, and the sound pressure level can be 40-65 dB.
As shown in fig. 2, when the background sound database is established, a plurality of groups of background sound samples may be preset, the background sound samples may be water sound, wind sound, sea wave sound, and the like, and there may be a plurality of sounds in any frequency band of 500 to 1000 Hz. Then, the organizer carries out subjective evaluation in a specific area (such as an evaluation room) by adopting a certain evaluation method or according to specific requirements, and selects background sound with high subjective evaluation from the evaluation, such as music which can give a sense of joy and sunshine. Meanwhile, the background sound sample can be objectively analyzed by combining corresponding software (such as Spek acoustic spectrum analysis software, PocketRTA sound analysis software and the like), so that better background sound about loudness, jitter, roughness and the like can be obtained. And then, the background sound selected subjectively and the background sound obtained by software analysis can be counted, and the common background sound of the two can be selected comprehensively to form a background sound database.
Further, the background sound after comprehensive selection can be further processed, for example, the background sound with the frequency of 600-700Hz and the background sound with the sound pressure level of 45dB can be processed, so that the background sound with the frequency of 600-700Hz and the sound pressure level of any value within the range of 40-65 dB can be obtained.
S4, the generated masking sound signal is synthesized with the processed background sound and output.
Specifically, as shown in fig. 3, the threshold of low frequency sound is higher than that of high frequency sound, and when the frequency of sound is very low, the sound pressure level needs to be above 60dB to be heard, but when the frequency of sound is about 8KHz, the sound can be heard only by several decibels. In this regard, the high-frequency noise of the motor can be masked by the low-frequency sound (i.e., masking sound signal) to improve the hearing threshold of the high-frequency noise, but the sound pressure level may be increased to be higher than the original sound pressure level of the current environment, and the noise reduction effect cannot be achieved. At this time, a proper background sound can be added, and the background sound is used to mask the masking sound signal, so that the sound masked by the masking sound signal is hidden in the background sound (such as wind sound, water flow sound, etc.) which is pleasant to accept by human ears, that is, the sound pressure level of the sound environment is reduced, and the sound heard by human ears is pleasant background sound.
If the background sound is directly used to mask the high-frequency noise signal, the sound pressure level of the original sound environment will be greatly increased, and the masking effect will not be achieved.
Therefore, the method for masking the high-frequency noise of the motor can mask the high-frequency noise signal generated by the motor, so that the high-frequency noise signal is expressed by a background sound which is easy to accept by people, and the use experience of people on related products of the motor is promoted.
In one example of the present invention, as shown in fig. 4, the above step S1 includes the following steps:
and S101, selecting the frequency of the masking signal according to the collected high-frequency noise signal, and adjusting the sound pressure level of the masking signal.
S102, acquiring the sound pressure level of the masking signal for masking the high-frequency noise signal.
And S103, modeling is carried out on the basis of the frequencies of the high-frequency signals, the frequency of the masking signal and the sound pressure level of the masking signal for masking the high-frequency noise signal to obtain a masking curve function.
Specifically, the frequency spectrum analysis is performed on the collected high-frequency noise signal to obtain the frequency and sound pressure level of the high-frequency noise signal. The frequency band of the collected high frequency noise signal may be divided, for example, with a bandwidth of every 100 Hz. Firstly, a signal of a certain frequency band (such as 4000-4100 Hz) is selected, and the corresponding sound pressure level is fixed, such as 30 dB. Then, selecting the frequency band (e.g. 600-700 Hz) of the masking signal, controlling the sound pressure level to gradually rise (e.g. from 40 dB), observing the sound pressure level of the masking signal masking the high-frequency noise signal (the frequency band is 4000-4100 Hz), and if the sound pressure level just masks the high-frequency noise signal with the frequency band of 4000-4100 Hz and the sound pressure level of 30dB at 63dB, obtaining the point (600 + 700Hz, 63 dB). Thus, an infinite number of such points can be obtained, and a masking curve function can be obtained.
In another example of the present invention, as shown in fig. 5, the above step S1 includes the steps of:
and S111, selecting the sound pressure level of the masking signal according to the collected high-frequency noise signal, and adjusting the frequency of the masking signal.
S112, a frequency of the mask signal in which the high-frequency noise signal is masked is obtained.
S113, modeling is performed based on the frequencies of the plurality of high-frequency signals, the sound pressure level of the masking signal, and the frequency of the masking signal masking off the high-frequency noise signal to obtain a masking curve function.
Specifically, the frequency spectrum analysis is performed on the collected high-frequency noise signal to obtain the frequency and sound pressure level of the high-frequency noise signal. The frequency band of the collected high frequency noise signal may be divided, for example, with a bandwidth of every 100 Hz. Firstly, a signal of a certain frequency band (such as 4000-4100 Hz) is selected, and the sound pressure level is fixed, such as 30 dB. Then, the sound pressure level (e.g. 63dB) of the masking signal is selected, the frequency band of the masking signal is gradually increased, the frequency band of the masking signal with the high-frequency noise signal (the frequency band is 4000-4100 Hz) masked is observed, if the frequency band just masks the 4000-4100 Hz frequency band at 600-. Thus, an infinite number of such points can be obtained, and a masking curve function can be obtained.
In an embodiment of the invention, the spectral data of the high frequency noise signal may comprise the frequency and sound pressure level of the high frequency noise signal. It can be understood that the spectrum data of the high-frequency noise signal can be obtained by performing spectrum analysis on the high-frequency noise signal, and a specific spectrum analysis method belongs to a relatively mature technology and is not described in detail.
Further, the frequency of the masking sound signal may be determined according to the frequency of the high-frequency noise signal and the masking curve function, and then the masking sound signal may be generated according to the frequency of the masking sound signal.
Specifically, when the frequency and the voltage boosting level of the high-frequency noise signal are determined, the frequency and the voltage level of the masking signal may be determined according to the masking curve function, where the frequency of the masking signal is the frequency of the masking sound signal, and the masking sound signal may be generated according to the frequency of the masking sound signal.
In one example of the present invention, when generating a masking sound signal according to a frequency of the masking sound signal, a high-frequency noise signal may be filtered by an LMS adaptive filter according to the frequency of the masking sound signal to generate the masking sound signal.
Specifically, as shown in fig. 6, the collected high-frequency noise signal is substituted into the LMS adaptive estimation function to obtain the frequency characteristic of the high-frequency noise signal, and the LMS algorithm is started. And simultaneously combining a masking curve function to obtain the frequency of a masking sound signal for masking the high-frequency noise signal, wherein the frequency can ensure that the hearing threshold of the sound masked by the masking sound signal is the lowest and the change of the sound pressure level is the smallest. It will be appreciated that in the LMS algorithm, each step is taken small enough that the frequency change tends to be 0, so that the change in sound pressure level is infinitely small.
Further, redundant components are filtered out through an LMS adaptive filter, and the output signal is subjected to D/A conversion to output a masking sound signal.
When the generated masking sound signal masks a high-frequency noise signal, the sound pressure level of the sound environment is increased, and the noise reduction effect is not achieved.
To improve the acoustic ambient noise, a background sound may be added on the basis of the masking sound signal. Specifically, the background sound may be selected from a background sound database according to the frequency of the high frequency signal, the reference sound pressure level may be determined according to the sound pressure level of the high frequency noise signal and the masking curve function, and the background sound selected from the background sound database may be paired according to the reference sound pressure level.
Wherein the background sound may include a first type of background sound and a second type of background sound.
Specifically, selecting the background sound from the background sound database according to the frequency of the high-frequency signal comprises: judging whether the frequency of the high-frequency noise signal is stable; if the frequency of the high-frequency noise signal is unstable, selecting a first type of background sound according to the rotating speed of the motor; if the frequency of the high frequency noise signal is stable, a second type of background sound is selected.
It is understood that the frequency of the motor high-frequency noise signal actually collected is not generally constant, and may fluctuate centered on a certain frequency range. In an example of the present invention, when the frequency fluctuation range is large, such as 3500 to 4500Hz, and the bandwidth is 1000Hz, the frequency of the high-frequency noise signal may be considered unstable; when the frequency fluctuation range is small, such as 4000-4100 Hz and the bandwidth is 100Hz, the frequency of the high-frequency noise signal can be considered to be stable.
Further, when the frequency and the boost level of the high-frequency noise signal are determined, the frequency and the sound pressure level of the masking signal may be determined according to the masking curve function, where the sound pressure level of the masking signal is the reference sound pressure level. Then, the background sound corresponding to the frequency can be selected from the first kind of background sound or the second kind of background sound according to the frequency of the masking signal, and then the background sound selected from the first kind of background sound or the second kind of background sound can be processed according to the reference sound pressure level, so that the sound pressure level of the processed background sound reaches the reference sound pressure level.
In an embodiment of the present invention, when the load variation of the motor is large, the frequency of the high-frequency noise signal of the motor fluctuates greatly along with the variation of the rotating speed of the motor, and at this time, when the high-frequency noise signal is masked, the first type of background sound, that is, the background sound varying along with the rotating speed, may be selected. The first background sound obtaining method can be illustrated by fig. 7:
as shown in fig. 7, taking wind noise as an example, engine sounds at different motor rotation speeds are recorded during the simulated driving, where the wind noise is a when the motor rotation speed is 1000 rpm, the wind noise is b when the motor rotation speed is 1100 rpm, and so on. Each rotation speed corresponds to a wind sound, and the rotation speeds and the wind sounds are fitted into a function, namely a function of the rotation speed and the sound is formed, and the function is called as 'function background sound'. When the first type of background sound corresponding to the function background sound is called, the rotating speed of the motor CAN be obtained through the CAN bus, and the first type of background sound is obtained according to the rotating speed of the motor.
It should be noted that the method for establishing the "function background sound" is exemplary, and the "function background sound" may also be established according to a relationship between the vehicle speed and the wind sound, and may also be established according to a relationship between the rotational speed and the water flow sound, a relationship between the vehicle speed and the water flow sound, and the like, which is not limited herein.
In another embodiment of the present invention, when the load of the motor is relatively constant, the frequency of the high-frequency noise signal is relatively stable, and the required background sound is relatively single, and at this time, a relatively common sound (such as a water flow sound, a wind sound, etc.) that people are willing to accept can be selected as the second type of background sound through the flow of fig. 2.
It should be noted that, in order to reduce the complexity of processing the background sound in actual use, the background sound with appropriate frequency and pressure level may also be directly selected from the background sound database according to the frequency spectrum data of the acquired high-frequency noise signal and the masking curve function. It will be appreciated that the background sound database is now required to store background sounds at various frequencies and various sound pressure levels.
In order to facilitate understanding of the method for masking high-frequency noise of the motor according to the embodiment of the present invention, it can be illustrated by fig. 8:
as shown in fig. 8, the frequency and the sound pressure level of the high-frequency noise signal can be obtained by collecting the high-frequency noise signal and performing corresponding spectrum analysis, for example, the frequency of the high-frequency noise signal is 4000Hz, and the sound pressure level is 30 dB. According to the masking curve function, the frequency of a masking signal masking the high-frequency noise signal is 600-700Hz, and the sound pressure level is 63 dB. On one hand, the frequency of the masking sound signal can be determined to be 600-700Hz, and the frequency is input into an LMS adaptive filter to generate the masking sound signal. On the other hand, the reference sound pressure level can be determined to be 63dB, appropriate background sound is selected from the background sound database according to the frequency stability of the high-frequency noise signal, and the background sound is processed according to the reference sound pressure level and output. And synthesizing the generated masking sound signal and the processed background sound and outputting the synthesized masking sound signal, wherein the sound heard by human ears is the background sound which is happy to accept, and the sound pressure level of the output background sound can just mask the generated masking sound signal.
In summary, the method for masking the high-frequency noise of the motor provided by the embodiment of the invention can well mask the high-frequency noise signal generated by the motor, and the high-frequency noise signal is expressed by a background sound which is easy to accept by people, thereby being beneficial to improving the use experience of people on motor products.
Fig. 9 is a block diagram of a masking apparatus for high-frequency noise of a motor according to an embodiment of the present invention. As shown in fig. 9, the masking apparatus for high frequency noise of a motor includes: the device comprises a pre-generation unit 10, an acquisition unit 20, a signal generation unit 30, a selection processing unit 40 and a synthesis output unit 50.
Wherein the pre-generation unit 10 is configured to generate a masking curve function based on the high frequency noise signal generated by the motor. The acquisition unit 20 is used for acquiring a high-frequency noise signal generated by the motor in real time. The signal generating unit 30 is configured to generate a masking sound signal according to the acquired spectrum data of the high-frequency noise signal and a masking curve function. The selection processing unit 40 is configured to select a background sound from a background sound database according to the acquired spectral data of the high-frequency noise signal, and process the selected background sound according to a masking curve function. The synthesis output unit 50 is configured to synthesize the generated masking sound signal and the processed background sound, and output the synthesized masking sound signal.
It can be understood that the background sound in the background sound database may be a sound that can be accepted by human ears and is comfortable to feel, the frequency may have a range of 500-1000 Hz, and the sound pressure level may have a range of 40-65 dB.
In an embodiment of the present invention, the pre-generation unit 10 is specifically configured to select a frequency of a masking signal according to the collected high-frequency noise signal, adjust a sound pressure level of the masking signal, obtain a sound pressure level of the masking signal with the high-frequency noise signal masked, and model based on the frequencies of the plurality of high-frequency signals, the frequency of the masking signal, and the sound pressure level of the masking signal with the high-frequency noise signal masked to obtain a masking curve function.
Specifically, the frequency spectrum analysis is performed on the collected high-frequency noise signal to obtain the frequency and sound pressure level of the high-frequency noise signal. The frequency band of the collected high frequency noise signal may be divided, for example, with a bandwidth of every 100 Hz. A signal of a certain frequency band (for example 4000-4100 Hz) is selected, and the sound pressure level is fixed, for example 30 dB. Then, selecting a frequency range (such as 600-700 Hz) of the masking signal, controlling the sound pressure level to gradually rise, observing the sound pressure level of the masking signal for masking off the high-frequency noise signal (the frequency range is 4000-4100 Hz), and if the sound pressure level just masks off the high-frequency noise signal in the frequency range of 4000-4100 Hz when 63dB, obtaining a point (600 + 700Hz, 63 dB). Thus, an infinite number of such points can be obtained, and a masking curve function can be obtained.
In another embodiment of the present invention, the pre-generation unit 10 is further specifically configured to select a sound pressure level of a masking signal according to the collected high-frequency noise signal, adjust a frequency of the masking signal, obtain a frequency of the masking signal with the high-frequency noise signal masked, and model based on the frequencies of the plurality of high-frequency signals, the sound pressure level of the masking signal, and the frequency of the masking signal with the high-frequency noise signal masked to obtain the masking curve function.
Specifically, the frequency spectrum analysis is performed on the collected high-frequency noise signal to obtain the frequency and sound pressure level of the high-frequency noise signal. The frequency band of the collected high frequency noise signal may be divided, for example, with a bandwidth of every 100 Hz. A signal of a certain frequency band (for example 4000-4100 Hz) is selected, and the sound pressure level is fixed, for example 30 dB. Then, the sound pressure level (e.g. 63dB) of the masking signal is selected, the frequency band of the masking signal is gradually increased, the frequency band of the masking signal with the high-frequency noise signal (the frequency band is 4000-4100 Hz) masked is observed, and if the high-frequency noise signal with the frequency band of 4000-4100 Hz is just masked when the frequency band is 600-. Thus, an infinite number of such points can be obtained, and a masking curve function can be obtained.
In one embodiment of the invention, the spectral data comprises the frequency and sound pressure level of the high frequency noise signal.
Specifically, the signal generating unit 30 is configured to determine a frequency of the masking sound signal from the frequency of the high-frequency noise signal and the masking curve function, and generate the masking sound signal from the frequency of the masking sound signal.
When the signal generating unit 30 generates the masking sound signal according to the frequency of the masking sound signal, the high-frequency noise signal may be filtered by the LMS adaptive filter according to the frequency of the masking sound signal to generate the masking sound signal.
The selection processing unit 40 is configured to select a background sound from the background sound database according to the frequency of the high-frequency signal, determine a reference sound pressure level according to the sound pressure level of the high-frequency noise signal and the masking curve function, and process the background sound selected from the background sound database according to the reference sound pressure level.
In an embodiment of the present invention, the background sound includes a first kind of background sound and a second kind of background sound.
Further, when selecting the background sound from the background sound database according to the frequency of the high-frequency signal, the selection processing unit 40 is specifically configured to determine whether the frequency of the high-frequency noise signal is stable, and if the frequency of the high-frequency noise signal is unstable, select the first type of background sound according to the rotation speed of the motor; if the frequency of the high frequency noise signal is stable, a second type of background sound is selected.
It is understood that the frequency of the motor high-frequency noise signal actually collected is not generally constant, and may fluctuate centered on a certain frequency range. In an example of the present invention, when the frequency fluctuation range is large, such as 3500 to 4500Hz, and the bandwidth is 1000Hz, the frequency of the high-frequency noise signal may be considered unstable; when the frequency fluctuation range is small, such as 4000-4100 Hz and the bandwidth is 100Hz, the frequency of the high-frequency noise signal can be considered to be stable.
It should be noted that, for a specific implementation of the masking device for motor high-frequency noise according to the embodiment of the present invention, reference may be made to the specific implementation of the masking method for motor high-frequency noise according to the foregoing embodiment, and details are not described here for reducing redundancy.
The masking device for the high-frequency noise of the motor of the embodiment of the invention generates a masking curve function in advance through a pre-generation unit based on a high-frequency noise signal generated by the motor, collects the high-frequency noise signal generated by the motor in real time through a collection unit when the high-frequency noise signal is masked, generates a masking sound signal according to the frequency spectrum data of the collected high-frequency noise signal and the masking curve function through a signal generation unit, selects a background sound from a background sound database according to the frequency spectrum data of the collected high-frequency noise signal through a selection processing unit, processes the background sound selected from the background sound database according to the masking curve function, and then synthesizes and outputs the generated masking sound signal and the processed background sound through a synthesis output unit. Therefore, high-frequency noise signals generated by the motor can be masked, so that the high-frequency noise signals are displayed by background sound which is happy to be accepted by people, and the use experience of people on motor related products is promoted.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (16)
1. A method for masking high-frequency noise of a motor is characterized by comprising the following steps:
generating a masking curve function based on a high-frequency noise signal generated by the motor;
collecting high-frequency noise signals generated by the motor in real time;
generating a masking sound signal according to the acquired frequency spectrum data of the high-frequency noise signal and the masking curve function, selecting a background sound from a background sound database according to the acquired frequency spectrum data of the high-frequency noise signal, and processing the selected background sound according to the masking curve function, wherein the frequency spectrum data comprises the frequency and the pressure level of the high-frequency noise signal, the background sound is selected from the background sound database according to the frequency spectrum data of the high-frequency noise signal, and the selected background sound is processed according to the masking curve function, specifically comprising:
selecting background sound from a background sound database according to the frequency of the high-frequency signal;
determining a reference sound pressure level according to the sound pressure level of the high-frequency noise signal and the masking curve function;
processing the background sound selected from the background sound database according to the reference sound pressure level;
and synthesizing the generated masking sound signal and the processed background sound and outputting the synthesized masking sound signal.
2. The method for masking high-frequency noise of an electric machine according to claim 1, wherein the generating a masking sound signal according to the spectrum data of the high-frequency noise signal and a masking curve function comprises:
determining the frequency of a masking sound signal according to the frequency of the high-frequency noise signal and the masking curve function;
generating the masking sound signal according to a frequency of the masking sound signal.
3. The method for masking high-frequency noise of an electric motor according to any one of claims 1-2, wherein said generating a masking curve function based on a high-frequency noise signal generated by the electric motor comprises the steps of:
selecting the frequency of a masking signal according to the collected high-frequency noise signal, and adjusting the sound pressure level of the masking signal;
acquiring the sound pressure level of the masking signal for masking the high-frequency noise signal;
modeling to obtain the masking curve function based on frequencies of a plurality of high frequency signals, a frequency of a masking signal, and a sound pressure level of the masking signal masking out the high frequency noise signal.
4. A method for masking high frequency noise of an electric motor according to any one of claims 1 to 3, wherein said generating a masking curve function based on a high frequency noise signal generated by the electric motor further comprises the steps of:
selecting the sound pressure level of a masking signal according to the collected high-frequency noise signal, and adjusting the frequency of the masking signal;
acquiring the frequency of the masking signal for masking the high-frequency noise signal;
modeling to obtain the masking curve function based on frequencies of a plurality of high frequency signals, a sound pressure level of a masking signal, and a frequency of the masking signal masking out the high frequency noise signal.
5. The method for masking high-frequency noise of an electric motor according to claim 2, wherein the generating a masking sound signal according to the frequency of the masking signal comprises:
and filtering the high-frequency noise signal through an LMS adaptive filter according to the frequency of the masking sound signal to generate the masking sound signal.
6. The method for masking high frequency noise of an electric motor according to claim 1, wherein the background sound includes a first type of background sound and a second type of background sound.
7. The method for masking high frequency noise of an electric motor according to claim 6, wherein selecting a background sound from a background sound database based on the frequency of the high frequency signal comprises:
judging whether the frequency of the high-frequency noise signal is stable or not;
if the frequency of the high-frequency noise signal is unstable, selecting the first type of background sound according to the rotating speed of the motor;
selecting the second type of background sound if the frequency of the high frequency noise signal is stable.
8. The method for masking high-frequency noise of the motor according to claim 1, wherein the sound pressure level of the background sound in the background sound database is in a range of 40-65 dB.
9. A device for masking high-frequency noise of a motor is characterized by comprising:
the pre-generation unit is used for generating a masking curve function based on a high-frequency noise signal generated by the motor;
the acquisition unit is used for acquiring a high-frequency noise signal generated by the motor in real time;
the signal generating unit is used for generating a masking sound signal according to the spectrum data of the collected high-frequency noise signal and the masking curve function, wherein the spectrum data comprises the frequency and the sound pressure level of the high-frequency noise signal;
the selection processing unit is used for selecting background sound from a background sound database according to the collected high-frequency noise signal and processing the selected background sound according to the masking curve function; the selection processing unit is specifically configured to:
selecting background sound from the background sound database according to the frequency of the high-frequency signal;
determining a reference sound pressure level according to the sound pressure level of the high-frequency noise signal and the masking curve function;
processing the background sound selected from the background sound database according to the reference sound pressure level;
and the synthesis output unit is used for synthesizing the generated masking sound signal and the processed background sound and outputting the synthesized masking sound signal.
10. The apparatus for masking high-frequency noise of an electric motor according to claim 9, wherein the signal generating unit is specifically configured to:
determining the frequency of a masking sound signal according to the frequency of the high-frequency noise signal and the masking curve function;
generating the masking sound signal according to a frequency of the masking sound signal.
11. The apparatus for masking high-frequency noise of an electric motor according to any one of claims 9 to 10, wherein the pre-generation unit is specifically configured to:
selecting the frequency of a masking signal according to the collected high-frequency noise signal, and adjusting the sound pressure level of the masking signal;
acquiring the sound pressure level of the masking signal for masking the high-frequency noise signal;
modeling to obtain the masking curve function based on frequencies of a plurality of high frequency signals, a frequency of a masking signal, and a sound pressure level of the masking signal masking out the high frequency noise signal.
12. The apparatus for masking high-frequency noise of an electric motor according to any one of claims 9 to 10, wherein the pre-generation unit is further configured to:
selecting the sound pressure level of a masking signal according to the collected high-frequency noise signal, and adjusting the frequency of the masking signal;
acquiring the frequency of the masking signal for masking the high-frequency noise signal;
modeling to obtain the masking curve function based on frequencies of a plurality of high frequency signals, a sound pressure level of a masking signal, and a frequency of the masking signal masking out the high frequency noise signal.
13. The apparatus for masking high-frequency noise of a motor according to claim 10, wherein the signal generating unit is configured to, when generating the masking sound signal according to the frequency of the masking sound signal:
and filtering the high-frequency noise signal through an LMS adaptive filter according to the frequency of the masking sound signal to generate the masking sound signal.
14. The apparatus for masking high frequency noise of an electric motor according to claim 9, wherein said background sound comprises a first type of background sound and a second type of background sound.
15. The apparatus for masking high-frequency noise of a motor according to claim 14, wherein the selection processing unit is configured to, when selecting the background sound from a background sound database according to the frequency of the high-frequency signal, specifically:
judging whether the frequency of the high-frequency noise signal is stable or not;
if the frequency of the high-frequency noise signal is unstable, selecting the first type of background sound according to the rotating speed of the motor;
selecting the second type of background sound if the frequency of the high frequency noise signal is stable.
16. The device for masking high-frequency noise of the motor according to claim 9, wherein the sound pressure level of the background sound in the background sound database is in a range of 40-65 dB.
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| CN201710092478.5A CN108461078B (en) | 2017-02-21 | 2017-02-21 | Method and device for masking high-frequency noise of motor |
| PCT/CN2018/075378 WO2018153243A1 (en) | 2017-02-21 | 2018-02-06 | Masking method and device for motor high-frequency noise |
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| WO2020098892A1 (en) * | 2018-11-16 | 2020-05-22 | Vestas Wind Systems A/S | Wind turbine noise masking |
| CN110830886B (en) * | 2019-11-15 | 2021-04-13 | 钱孟泽 | Curve drawing system based on Arduino intelligent sound collection |
| CN111210801B (en) * | 2020-02-25 | 2022-08-02 | 北京绿创声学工程股份有限公司 | Tonal noise compensation elimination method and system |
| CN112151050B (en) * | 2020-08-26 | 2022-11-11 | 宁波方太厨具有限公司 | Sound quality adjusting method for electric appliance noise and range hood |
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