CN108229030B - Design method of controller parameters of active noise reduction system - Google Patents
Design method of controller parameters of active noise reduction system Download PDFInfo
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- CN108229030B CN108229030B CN201810010686.0A CN201810010686A CN108229030B CN 108229030 B CN108229030 B CN 108229030B CN 201810010686 A CN201810010686 A CN 201810010686A CN 108229030 B CN108229030 B CN 108229030B
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Abstract
The invention discloses a design method of controller parameters of an active noise reduction system, which is characterized in that the probability average of energy of each position is calculated according to the probability of the head moving each position, the total spatial energy in a noise reduction area is calculated by combining the probability of the head appearing at each position counted by measurement and the calculated total energy of each position, and the calculated controller parameters are used for the design of a controller in practical application under the condition of the minimum total energy, so that the noise reduction effect of the system is optimal.
Description
Technical Field
The invention relates to the field of noise reduction, in particular to a design method of parameters of a controller of an active noise reduction system.
Background
When designing an active noise reduction system aiming at a spatial field near a human ear, a mold human head or a human body is generally required to be used for preliminary testing, specifically, a sensor is placed at an ear canal of the mold, characteristics of a noise field at the position of the human ear and a transfer function of a secondary sound source at the position of the human ear are measured, after the preliminary testing is finished, measured data are stored in a signal processor, and system parameters of an active noise reduction controller are designed according to the measured results, but when the system is applied to a real environment, noise reduction is aimed at the position of the human ear when a user is actually used, however, the position of the head of the user is uncertain in the using process, random movement in a certain range is generated near the position of the mold human head of the previous testing, which causes that a sound signal generated by an excitation source of a secondary speaker at the position of the actual human ear is inconsistent with the data obtained in the previous testing, therefore, the noise reduction effect of the controller designed according to the previous test data can be influenced during actual use, and then in actual application, it is impossible to place a sensor at the position of the human ear of a user to measure the transfer function of the secondary sound source at the position of the actual human ear in real time. Even if the user wears the sensor at the ear, the real-time measurement method cannot achieve the ideal effect because the transfer function of the measuring loudspeaker needs to use the loudspeaker to send an additional noise excitation signal while actively reducing noise, and then the real-time test can be completed by extracting a response signal corresponding to the additional excitation from the ear sensor, but the additional excitation sound source can deteriorate the active noise reduction effect.
Disclosure of Invention
The invention aims to provide a method for designing parameters of a controller of an active noise reduction system, which can well reduce the noise level of a space near the human ear aiming at the random variation of the head position of a user under the conditions of not adding additional noise and not arranging a sensor at the human ear.
In order to achieve the technical purpose, the invention adopts the following technical scheme that the method for designing the parameters of the controller of the active noise reduction system comprises the following steps:
s1, determining a noise reduction area, and installing a plurality of input devices and output devices in a space needing noise reduction;
s2, measuring and counting the probability of the head of the person appearing at each random position;
s3, calculating the probability average of the energy of each position where the head appears, because the probability of the head existing at each point of the space is measured and counted in the previous period of experiment, the energy of each point of the space needs to be measured next, the number of error microphones in the space may be 2, 4 or n, and depends on the characteristics of the specific space:
where alpha represents a certain determined position in space and l represents the number of a certain error microphone, then
Representing the signal at the ith error microphone when the head is at alpha,
the original noise source signal at the ith error microphone when the head is at alpha is shown, and the plus sign is followed by the backward sound wave signal sent by the system, then the formula shows that the noise signal after noise reduction has been carried out at the ith error microphone when the head is at alpha, the formula represents the noise signal near one microphone, if there are several microphones in the actual system, the signals of the several microphones need to be added, and the overall energy of each position is calculated according to the formula, and the overall energy of the alpha position is shown by the following formula:
s4, combining the probability of the human head appearing at each position obtained by the measurement statistics of the step S2 and the overall energy of each position obtained by the step S3 to obtain the total spatial energy J in the noise reduction region:
and S5, obtaining the minimum value of the total spatial energy obtained in the step S4, and deriving the optimal parameter w of the controller.
Preferably, step S2 records the probability of each human head in the space by recording the motion law of each human subject in the noise reduction region space.
Preferably, the parameters of the controller are parameter values obtained when the total energy at the human ear is minimum in the early noise reduction experiment measurement process, so that the best noise reduction effect is ensured when the noise reduction system is actually applied.
The invention calculates the probability average of the energy of each position according to the probability of the head moving each position, thereby obtaining the energy of the whole space, under the condition that the whole energy is minimum, the parameters of the controller are calculated and used for the design of the controller in practical application, thereby leading the noise reduction effect of the system to be optimal, being understood as noise reduction at the position which needs noise reduction most, realizing the optimal noise reduction effect of the whole space, and well reducing the noise level of the space near the human ear under the condition that additional noise is not required and a sensor is not required to be arranged in the human ear canal.
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FIG. 1 is a flow chart 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 accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be understood that the terms "mounted," "connected," and "connected" are used broadly and can be, for example, mechanically or electrically connected, or can be internal to two elements, directly connected, or indirectly connected through an intermediate medium. The specific meaning of the above terms can be understood by those of ordinary skill in the art as appropriate.
The following describes a design method of parameters of an active noise reduction system controller according to an embodiment of the present invention with reference to fig. 1, including the following steps:
s1, determining a noise reduction area, and installing a plurality of input devices and output devices in a space needing noise reduction;
s2, measuring and counting the probability of the head of the person appearing at each random position;
s3, calculating the probability average of the energy of each position where the head appears, because the probability of the head existing at each point of the space is measured and counted in the previous period of experiment, the energy of each point of the space needs to be measured next, the number of error microphones in the space may be 2, 4 or n, and depends on the characteristics of the specific space:
where alpha represents a certain determined position in space and l represents the number of a certain error microphone, then
Representing the signal at the ith error microphone when the head is at alpha,
the original noise source signal at the ith error microphone when the head is at alpha is shown, and the plus sign is followed by the backward sound wave signal sent by the system, then the formula shows that the noise signal after noise reduction has been carried out at the ith error microphone when the head is at alpha, the formula represents the noise signal near one microphone, if there are several microphones in the actual system, the signals of the several microphones need to be added, and the overall energy of each position is calculated according to the formula, and the overall energy of the alpha position is shown by the following formula:
s4, combining the probability of the human head appearing at each position obtained by the measurement statistics of the step S2 and the overall energy of each position obtained by the step S3 to obtain the total spatial energy J in the noise reduction region:
and S5, obtaining the minimum value of the total spatial energy obtained in the step S4, and deriving the optimal parameter w of the controller.
Preferably, step S2 records the probability of each human head in the space by recording the motion law of each human subject in the noise reduction region space.
Preferably, the parameters of the controller are parameter values obtained when the total energy at the human ear is minimum in the early noise reduction experiment measurement process, so that the best noise reduction effect is ensured when the noise reduction system is actually applied.
The invention calculates the probability average of the energy of each position according to the probability of the head moving each position, thereby obtaining the energy of the whole space, under the condition that the whole energy is minimum, the parameters of the controller are calculated and used for the design of the controller in practical application, thereby leading the noise reduction effect of the system to be optimal, being understood as noise reduction at the position which needs noise reduction most, realizing the optimal noise reduction effect of the whole space, and well reducing the noise level of the space near the human ear under the condition that additional noise is not required and a sensor is not required to be arranged in the human ear canal.
In the description herein, references to the description of "one embodiment," "an 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 do not necessarily 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.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (3)
1. A design method for parameters of a controller of an active noise reduction system is characterized by comprising the following steps:
s1, determining a noise reduction area, and installing a plurality of microphones and loudspeakers in a space needing noise reduction;
s2, measuring and counting the probability of the head of the person appearing at each random position;
s3, calculating the probability average of the energy of each position where the head appears, because the probability of the head existing at each point position in the space is measured and counted in the previous period of experiment, the energy of each point in the space needs to be measured, the number of the error microphones in the space is any number, and the error microphones depend on the characteristics of the specific space:
where α represents a certain determined position in space, l represents the number of a certain error microphone, m is the number of a noise reduction horn, n is time, and j is the last time, then
Representing the signal at the ith error microphone when the head is at alpha,
representing the original noise source signal at the ith error microphone when the head is at alpha, followed by the system-emitted inverse sound wave signal, where g (alpha) represents the coefficient of the transfer function of the loudspeaker response at alpha position, measured by prior measurements, u represents the signal driving the loudspeaker to emit noise-reduced sound waves, and u (alpha) represents the drive signal at alpha position, then
It is shown that the noise signal after noise reduction has been performed at the ith error microphone when the head is at alpha,
representing noise signals near one microphone, if there are several microphones in the actual system, it is necessary to add the signal energies of several microphones and calculate the overall energy of each position accordingly, and the overall energy of the α position is expressed by the following formula:
in the formula
For by a plurality of error microphones respectively
The column vector is composed, T is the transpose, E represents the expectation of the random variable,
for by a plurality of error microphones respectively
Constituent column vectors, R(α)(n) is obtained by conversion of a formula;
s4, combining the probability of the human head appearing at each position obtained by the measurement statistics of the step S2 and the overall energy of each position obtained by the step S3 to obtain the total spatial energy J in the noise reduction region:
f (alpha) represents a probability density function at alpha, and is obtained through the measurement statistics of random probability of each position in the early stage, and A, b and c are parameters converted from the formula of combining the steps S2 and S3 to obtain total energy;
s5, obtaining the minimum value of the total spatial energy obtained in the step S4, and deducing the optimal parameters of the controller
2. The design method of claim 1, wherein step S2 records the probability of each human head in the noise reduction region space by recording the motion law of each human subject in the space.
3. The design method of claim 1, wherein the optimization of the controllerParameter(s)
Namely, the parameter value obtained when the total energy at the human ear is minimum in the early noise reduction experiment measurement process S1-S5, so as to ensure that the noise reduction effect is optimal when the noise reduction system is actually applied.
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| CN108877758A (en) * | 2018-07-04 | 2018-11-23 | 北京安声科技有限公司 | A kind of spatial field active denoising method |
| CN109714668A (en) * | 2019-01-07 | 2019-05-03 | 哈尔滨工业大学（深圳） | Indoor active noise reduction device, noise-reduction method and storage medium |
| CN111083591A (en) * | 2019-12-13 | 2020-04-28 | 恒玄科技(北京)有限公司 | Configuration method and device of noise reduction earphone and noise reduction earphone |
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