CN116506774A - Sound field construction system and method with vortex sound beam ultrasonic radiation low-frequency enhancement function - Google Patents

Sound field construction system and method with vortex sound beam ultrasonic radiation low-frequency enhancement function Download PDF

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Publication number
CN116506774A
CN116506774A CN202310494649.2A CN202310494649A CN116506774A CN 116506774 A CN116506774 A CN 116506774A CN 202310494649 A CN202310494649 A CN 202310494649A CN 116506774 A CN116506774 A CN 116506774A
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sound
sound field
matrix
vortex
frequency
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刘联鋆
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Chongqing University
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Chongqing University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H04R2400/11—Aspects regarding the frame of loudspeaker transducers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation

Abstract

The invention relates to a sound field construction system and method with a vortex sound beam ultra-radiation low-frequency enhancement function, and belongs to the technical field of sound field construction. The sound field construction system comprises a microphone matrix, a microphone pre-amplifier, a sound card, a power amplifier and a loudspeaker matrix which are connected in sequence, and a computer connected with the sound card. The system also comprises a vortex sound beam super-radiation amplifying system consisting of a motor, a microphone circular array and an impeller type sound absorber. Collecting sound pressure frequency spectrum of an environment sound field through a microphone matrix, taking the sound pressure frequency spectrum as a sound field construction target, and sounding through a loudspeaker matrix to reproduce the target sound field; meanwhile, the loudspeaker is monitored to construct a sound field, and the 1/3 octave spectrum error between the loudspeaker and a target sound field is reduced by adjusting the input signal of the loudspeaker. The invention can construct vortex sound beams to realize the ultra-radiation low-frequency amplification function by a least square equalization feedback method, does not need to use a speaker circular array and a subwoofer, reduces the size of the speaker array, and reduces the cost of the speaker.

Description

Sound field construction system and method with vortex sound beam ultrasonic radiation low-frequency enhancement function
Technical Field
The invention belongs to the technical field of sound field construction, and relates to a sound field construction system and method with a vortex sound beam ultrasonic radiation low-frequency enhancement function.
Background
The sound insulation performance of the aircraft directly influences the riding comfort of passengers, and the excessive noise of the aircraft cabin even can harm the body health of the passengers, so that the sound insulation performance test of the aircraft can be carried out during the design of the aircraft. The general sound insulation performance test simulates the environment noise of the aircraft operation through a loudspeaker array, but the low-frequency sound power of the sound field constructed by the existing loudspeaker array is weaker, so that the sound pressure level generated in the environment sound field is lower, and a low-frequency loudspeaker such as a subwoofer is needed to obtain the sound field with higher low-frequency power, so that the loudspeaker is high in price and large in size, and is not beneficial to the construction of a sound field construction system. If the vortex sound beam superradiation principle can be applied to improve the low-frequency sound power of the loudspeaker array, the vortex sound beam superradiation principle is expected to be applied to sound fatigue tests on the sound pressure level of the environmental sound field, which is often more than 135 dB.
To make the sound field construction system have the function of amplifying ultra-radiation low frequency, firstly, a multichannel sound source system is adopted to construct an incident vortex sound beam carrying OAM, namely, a sound field with a phase relation ofI is imaginary unit, l is topological order of vortex beam, ++>Is the phase. The traditional method adopts the method that the method comprises the following steps of s Circular loudspeaker array composed of sound sources distributed at equal intervals, ensuring that each loudspeaker has +.>And the loudspeaker array sounds according to the phase relation to generate vortex sound beams, then the motor drives the sound absorber to rotate, and the super-radiation amplification principle of the vortex sound beams is applied to improve the low-frequency sound power of the loudspeaker. However, the speaker array formed in this way needs to be fixed in structure, the accuracy of the emitted sound beam depends on the processing accuracy and mounting and dimensional accuracy of the speakers, the sound beam cannot be improved by feedback control, and in addition, the size of the speaker array is often made large, for example, 32 speakers are needed to form a circular array, so that the practical application experience is poor.
Thus, in view of the above, there is a need for a sound field construction system and method that does not limit to circular speaker arrays to achieve vortex beam superradiation amplification.
Disclosure of Invention
In view of the above, the present invention is directed to a sound field construction system and method with a vortex beam ultra-radiation low frequency enhancement function, which generates vortex beams by a least squares equalization feedback method, does not need to use a circular speaker array, reduces the structural size of the speaker array, and adopts ultra-radiation amplification to enhance the low frequency sound power thereof.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the first scheme is that the sound field construction system with the vortex sound beam ultra-radiation low-frequency enhancement function comprises a microphone matrix, a microphone pre-amplifier, a sound card, a power amplifier and a loudspeaker matrix which are sequentially connected, and a computer connected with the sound card. The microphone matrix is used for collecting sound pressure frequency spectrum of an environment sound field as a sound field construction target; the computer is used for controlling the input and output signals of the sound card; the speaker matrix is used to generate a target sound field. Wherein the microphone matrix is a rectangular array composed of a plurality of microphones; the speaker matrix is a rectangular array composed of a plurality of speakers.
The system also comprises a vortex sound beam superradiation amplifying system, which comprises a motor, a microphone circular array and an impeller type sound absorber. The motor is used for driving the impeller type sound absorber to rotate; the microphone circular array is used for monitoring target sound pressure and phase of the vortex sound beam when the ultrasonic radiation amplification based on the vortex sound beam is carried out; impeller sound absorbers are used to enhance the low frequency acoustic power of the speaker matrix.
Optionally, the sound card is a multi-channel input-output sound card.
Scheme II, sound field construction method with low frequency sound enhancement function for the sound field construction system, comprising the steps of:
s1, collecting sound pressure frequency spectrums of an environmental sound field through a microphone matrix, and taking the sound pressure frequency spectrums as sound field construction targets;
s2, the computer controls the sound card to output signals to the speaker matrix, and drives the speaker matrix to sound to form a constructed winner;
s3, feeding back and controlling input signals of the speaker matrix by adopting a least square equalization feedback method until a 1/3 octave spectrum error of a constructed sound field and a target sound field is smaller than a set value, and obtaining an optimal input signal of the speaker matrix at the moment;
s4, the speaker matrix sounds according to the input signals obtained in the step S3, the sound pressure level of a sound field generated by the speaker matrix is monitored through the microphone matrix, if the sound pressure level is in a low-frequency center frequency f of a certain 1/3 octave spectrum m When the sound pressure level is lower than the target sound field, generating a vortex sound beam by adopting a least square equalization feedback method, and increasing the low-frequency sound power of the loudspeaker by utilizing the vortex sound beam superradiation amplification principle so as to improve the sound pressure level;
and S5, driving the speaker matrix to sound according to the obtained optimal input signal, and enhancing the low-frequency sound power of the speaker matrix in the S4 mode to reproduce the target sound field.
Further, in step S3, the least squares equalization feedback method specifically includes: target sound field P acquired by microphone matrix t Input equalization filterIn the method, the obtained time domain and frequency domain output signals of the sound card are S and S respectively, and the signal S is output to a power amplifier from the DAC end of the sound card to drive a speaker matrix to generate and construct a sound field P r The method comprises the steps of carrying out a first treatment on the surface of the Will build the sound field P r And the target sound field P t Difference is made to obtain error vector +.>Error vector +.>The target sound field is corrected in the input feedback equalizer EQ to obtain a sound field +.>And again into the equalization filter>In (a) and (b); and obtaining the optimal input signal of the speaker matrix through cyclic feedback control.
Further, in step S4, the speaker is monitored by the microphone matrixSound pressure level of sound field constructed by matrix, if at low frequency center frequency f of certain 1/3 octave spectrum m When the sound pressure level at the position is lower than the target sound field, all the loudspeakers are kept at a low frequency point f m The input signals of other frequency points are unchanged, and then part of speakers are adjusted in f based on a least square equalization feedback method m The input signal of the impeller type sound absorber is driven to rotate to start the super-radiation amplifying function, and the low-frequency sound power of the loudspeaker is improved; additionally, the input signals of other speakers are adjusted until the constructed sound field is at f m The sound pressure level at the location reaches the target sound field.
Further, when the vortex sound beam is generated through the loudspeaker, the microphone circular array is used as a vortex sound beam monitoring point, and the target sound pressure and the phase of the vortex sound beam generated by the loudspeaker at the monitoring point have the following characteristics:
wherein N is r ' represents the total number of microphones in the circular array of microphones, N represents 0 to N r Microphone serial number, P of' -1 t ' represents the ideal value of the vortex beam at the monitoring point, P 0 Representing the magnitude of any single-frequency sound pressure that can be achieved after the matrix of speakers is sounded.
The method for constructing the vortex sound beam by the least square equalizing feedback method comprises the following steps:
1) Will ideally swirl the sound beam P t ' input equalization filterThe frequency domain and time domain output signals S 'and S' of the sound card are respectively obtained as follows:
s′＝iFFT(S′)
wherein iFFT represents the inverse Fourier transform function;
2) Generating a sound field P by driving the part of the loudspeakers with a time-domain signal s r ′；
3) Will sound field P r ' sound pressure decibel value and phase at each monitoring point minus P t ' value, a vector containing sound pressure error and phase error is obtained
4) Error vectorIntroducing a feedback equalizer EQ to the sound field P t ' correction is performed to obtain->And input the equalization filter again>The cyclic feedback control is performed until the error (particularly the phase error) of the vortex beam constructed by the part of the speaker is minimized.
The invention has the beneficial effects that: the invention can make the speaker matrix generate vortex sound beams by the least square equalizing feedback method without using the traditional ring speaker array, so that the speaker array structure is more flexible; meanwhile, the invention also enhances the low-frequency sound power of the loudspeaker by the principle of super-radiation amplification, thereby not only realizing miniaturization on the structural size of the loudspeaker matrix, but also obtaining a low-frequency sound field with higher sound power by adopting a common loudspeaker, and saving the cost of the expensive loudspeaker.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a superradiance amplifying system;
FIG. 2 is a hardware connection diagram of a sound field construction system;
FIG. 3 is a schematic diagram of a least squares equalization feedback method;
FIG. 4 is an impeller sound absorber;
fig. 5 is a graph of the power amplification factor of the vortex beam versus the rotational frequency of the impeller type sound absorber.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
A sound field construction system with vortex beam superradiance low frequency enhancement is shown in fig. 2 and includes a microphone matrix, a microphone pre-amplifier, a sound card, a power amplifier and a speaker matrix, and a computer connected to the sound card. The number of microphones in the microphone matrix is slightly more than that of loudspeakers in the loudspeaker matrix, the sound pressure frequency spectrum of a certain environment sound field is acquired by the microphone matrix to serve as a sound field construction target, and the target sound field is reproduced in the experiment cabin. The sound field signals collected by the microphone matrix are input into the computer through the ADC end of the multi-channel input/output sound card, and the computer controls the sound card to drive the loudspeaker matrix to sound through the DAC end of the sound card. Meanwhile, a vortex sound beam superradiation amplifying system is arranged at the sound producing point of the loudspeaker matrix, as shown in fig. 1, the system comprises an impeller type sound absorber, a motor and a microphone circular array, wherein the impeller type sound absorber is arranged at the sound producing port of the loudspeaker matrix, the microphone circular array is attached to the rear of the impeller type sound absorber and used as a vortex sound beam monitoring point, and the motor is used for driving the impeller type sound absorber to rotate so as to realize superradiation amplification and increase low-frequency sound power of the loudspeaker matrix.
The target sound pressure and phase characteristics of the ideal vortex sound beam at each monitoring point are as follows:
wherein N is r ' represents the total number of microphones in the circular array of microphones, N represents 0 to N r Microphone serial number, P of' -1 t ' represents an ideal vortex beam at the monitoring point, P 0 Representing any single-frequency sound pressure amplitude that can be achieved after the speaker matrix is sounded.
The method for constructing the sound field comprises the following steps:
s1, collecting sound pressure frequency spectrums of an environmental sound field through a microphone matrix, and taking the sound pressure frequency spectrums as sound field construction targets;
s2, the computer controls the sound card to output signals to the speaker matrix, and drives the speaker matrix to sound to form a constructed sound field;
s3, monitoring the formed constructed sound field through a microphone matrix, and adopting a least square equalization feedback method to feed back and control input signals of a speaker matrix until the 1/3 octave spectrum error of the constructed sound field and the target sound field is smaller than a set value, so as to obtain an optimal input signal of the speaker matrix;
s4, the speaker matrix sounds according to the input signals obtained in the step S3, the sound pressure level of a sound field generated by the speaker matrix is monitored through the microphone matrix, if the sound pressure level is in a low-frequency center frequency f of a certain 1/3 octave spectrum m When the sound pressure level is lower than the target sound field, generating a vortex sound beam by adopting a least square equalization feedback method, and increasing the low-frequency sound power of the loudspeaker by utilizing the vortex sound beam superradiation amplification principle so as to improve the sound pressure level;
s5, driving the speaker matrix to sound according to the optimal input signal, and improving the low-frequency sound power of the speaker matrix to reproduce the target sound field through the step S4.
The least squares equalization feedback method is shown in fig. 3, and is specifically described as follows:
the initial stage feedback equalizer EQ is not working, and the microphone matrix collects the target sound field P t Directly input to equalization filter added in front of sound card(by N s ×N r Wherein N is a complex matrix representation of s Representing the total number of speakers in a speaker matrix, N r Representing the total number of microphones in the microphone matrix), the frequency and time domain output signals S and S of the sound card are obtained as:
s＝iFFT(S)
where iFFT represents the inverse Fourier transform function. Outputting the signal s to a power amplifier driving speaker matrix to generate a sound field P r 。
In fig. 3, G represents the physical transmission path throughout the process consisting of the sound card output, the power amplifier, the speaker and the environment. In order to make the constructed sound field approach the target sound field P t ThenEqualization system consisting of G>The following conditions should be satisfied as much as possible:
wherein I is an identity matrix, delta is the delay of a hardware system, and omega is the circular frequency. Thus (2)The ideal value of (a) is the inverse matrix of G, but the sound card output signal S obtained by the inverse matrix may exceed the dynamic range of the sound card, so a least square method is adopted, tikhonov regular parameter lambda is introduced, and S is calculated as:
the solution of the above formula is:
where the superscript H denotes the transpose of the matrix,is N r ×N s The element of the complex matrix representing the measurement of G is the frequency response function between each microphone and speaker in the microphone matrix and speaker matrix, which can be measured by a logarithmic sine sweep method.
The sound field P to be constructed r And the target sound field P t Difference is made to obtain error vectorError->Introduced into equalization feedback device EQ vs. sound field P t Correction is carried out to obtain->Is again input to +.>And performing cyclic feedback control until the 1/3 octave spectrum error of the constructed sound field and the target sound field is smaller than a set value.
Particularly, because the loudspeaker adopted by the invention is a common loudspeaker, the condition that the sound pressure level of a low-frequency point cannot reach a target sound field can occur due to smaller low-frequency sound power, and therefore, the invention monitors the sound pressure level of the sound field generated by the loudspeaker matrix through the microphone matrix (the loudspeaker matrix sounds according to the input signals obtained in the step S3 at the moment), and if the sound pressure level is repeatedly regulated by a least square equalization feedback method, the sound pressure level is adjusted at the low-frequency center frequency f of a certain 1/3 octave spectrum m When the sound pressure level at the point is still lower than the target sound field (wherein, when f m When the frequency is less than or equal to 250Hz, the frequency is low), a least square equalization feedback method is adopted to generate vortex sound beams, and the low-frequency sound power of the loudspeaker is increased by utilizing the principle of vortex sound beam super-radiation amplification, so that the sound pressure level is improved:
first keeping all speakers at low frequency point f m The input signals of other frequency points are unchanged and are based on the least twoAdjusting part of speakers at f by multiplying and equalizing feedback method m To generate a vortex beam and to keep the input signal of the loudspeaker unchanged, and to drive the impeller-type sound absorber to rotate to turn on the super-radiation amplifying function so as to enhance the low-frequency sound power of the loudspeaker. The rest of the speakers are adjusted at f in the same way as above m Until the sound field constructed by the speaker matrix is at f m The sound pressure level at that point reaches the set point. By the mode, the performance limit of the loudspeaker can be broken through, and high low-frequency sound power can be obtained.
The process of constructing the vortex beam is as follows:
the initial stage feedback equalizer EQ is not operated, and the ideal vortex sound beam P is generated t ' direct input to equalization filter added in front of sound card(by N s ′×N r ' Complex matrix representation, where N s ' denotes the number of partial loudspeakers, N r ' represents the total number of microphones in the circular array of microphones), resulting in frequency and time domain output signals S ' and S ' of the sound card as:
s′＝iFFT(S′)
where iFFT represents the inverse Fourier transform function. Outputting the s' output to a power amplifier to drive the part of the speaker to generate a sound field P r ′。
To make the constructed sound field approach the sound field P t ' thenEqualization system consisting of G->The following conditions should be satisfied as much as possible:
the ideal value of (a) is the inverse matrix of G ', and the sound card output signal S' obtained by the inverse matrix may exceed the dynamic range of the sound card, so a least square method is adopted, tikhonov regular parameter lambda 'is introduced, and S' is calculated as follows:
the solution of the above formula is:
where the superscript H denotes the transpose of the matrix,is N r ′×N s The complex matrix of 'represents the measurement of G' and its elements are the frequency response function between the microphone and the speaker in the circular array of microphones and the speaker partially emitting vortex beams, which can be measured by the logarithmic sine sweep method.
The sound field P to be constructed r ' sound pressure decibel value and phase at each monitoring point minus P t The value of' is a vector containing sound pressure error and phase errorIn order to precisely control the phase relation of the sound waves emitted by the loudspeakers, the error is +.>Is introduced into the equalization feedback device EQ pair P t ' correction, obtained->Is again input to +.>Until the built vortex beam error, in particular the phase error, is minimized.
After the construction of the vortex beam, the impeller type sound absorber shown in fig. 4 is driven to rotate by a motor, and the principle of super-radiation amplification of the vortex beam of the impeller type sound absorber (the principle of super-radiation amplification is described in article Experimental study of acoustic superradiance from a rotating absorber, journal of Applied Physics, and the embodiment is not specifically described any more) is utilized, so that the sound absorber according to f m The speaker matrix sounding (requiring enhanced sound field frequency) is low-frequency enhanced to increase the low-frequency sound power of the speaker, and the amplification effect is shown in fig. 5.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.

Claims (8)

1. A sound field construction system with vortex sound beam ultra-radiation low frequency enhancement function is characterized in that: the system comprises a microphone matrix, a microphone pre-amplifier, a sound card, a power amplifier and a loudspeaker matrix which are sequentially connected, and a computer connected with the sound card; the microphone matrix is used for collecting sound pressure frequency spectrums of an environment sound field as a sound field construction target; the computer is used for controlling input and output signals of the sound card; the speaker matrix is used for generating a target sound field;
the system also comprises a vortex sound beam super-radiation amplifying system, wherein the vortex sound beam super-radiation amplifying system comprises a motor, a microphone circular array and an impeller type sound absorber; the motor is used for driving the impeller type sound absorber to rotate; the microphone circular array is used for monitoring target sound pressure and phase of the vortex sound beam when the ultrasonic radiation amplification based on the vortex sound beam is carried out; the impeller sound absorber is used for enhancing the low-frequency sound power of the speaker matrix.
2. The sound field construction system according to claim 1, wherein: the microphone matrix is a rectangular array formed by a plurality of microphones; the speaker matrix is a rectangular array composed of a plurality of speakers.
3. The sound field construction system according to claim 1, wherein: the sound card is a multi-channel input/output sound card.
4. A sound field construction method with a low-frequency sound enhancement function for use in the sound field construction system according to any one of claims 1 to 3, characterized by: the method comprises the following steps:
s1, collecting sound pressure frequency spectrums of an environmental sound field through a microphone matrix, and taking the sound pressure frequency spectrums as sound field construction targets;
s2, controlling the sound card to output signals to the speaker matrix by the computer, and driving the speaker matrix to sound to form a constructed sound field;
s3, feeding back and controlling input signals of the speaker matrix by adopting a least square equalization feedback method until a 1/3 octave spectrum error of a constructed sound field and a target sound field is smaller than a set value, and obtaining an optimal input signal of the speaker matrix at the moment;
s4, the speaker matrix sounds according to the input signals obtained in the step S3, the sound pressure level of a sound field generated by the speaker matrix is monitored through the microphone matrix, if the sound pressure level is in a low-frequency center frequency f of a certain 1/3 octave spectrum m When the sound pressure level is lower than the target sound field, generating a vortex sound beam by adopting a least square equalization feedback method, and increasing the low-frequency sound power of the loudspeaker by utilizing the vortex sound beam superradiation amplification principle so as to improve the sound pressure level;
s5, driving the speaker matrix to sound according to the optimal input signal, and improving the low-frequency sound power of the speaker matrix through the step S4 so as to reproduce the target sound field.
5. The sound field construction method according to claim 4, wherein: in step S3, the least square equalization feedback method specifically includes: target sound field P acquired by microphone matrix t Input equalization filterIn the method, the obtained time domain and frequency domain output signals of the sound card are S and S respectively, and the signal S is output to a power amplifier from the DAC end of the sound card to drive a speaker matrix to generate and construct a sound field P r The method comprises the steps of carrying out a first treatment on the surface of the Will build the sound field P r And the target sound field P t Difference is made to obtain error vector +.>Error vector +.>The target sound field is corrected in the input feedback equalizer EQ to obtain a sound field +.>And again into the equalization filter>In (a) and (b); and obtaining the optimal input signal of the speaker matrix through cyclic feedback control.
6. The sound field construction method according to claim 4, wherein: the step S4 specifically comprises the following steps: first keeping all speakers at frequency f m The input signals of other frequency points are unchanged, and then part of speakers are adjusted in f based on a least square equalization feedback method m To generate a vortex beam and to keep the input signal of the loudspeaker unchangedDriving the impeller type sound absorber to rotate to start the super-radiation amplifying function, and improving the low-frequency sound power of the loudspeaker; the input signals of the other speakers are adjusted again until the constructed sound field is at f m The sound pressure level at the location reaches the target sound field.
7. The sound field construction method according to claim 6, wherein: the circular microphone array is used as a vortex sound beam monitoring point, and the target sound pressure and the phase of the vortex sound beam generated by the loudspeaker at the monitoring point have the following characteristics:
wherein N is r ' represents the total number of microphones in the circular array of microphones, N represents 0 to N r Microphone serial number, P of' -1 t ' represents the ideal value of the vortex beam at the monitoring point, P 0 Representing the magnitude of any single-frequency sound pressure that can be achieved after the matrix of speakers is sounded.
8. The sound field construction method according to claim 6, wherein: the step of constructing the vortex sound beam by the least squares equalization feedback method comprises the following steps:
1) Will ideally swirl the sound beam P t ' input equalization filterThe frequency domain and time domain output signals S 'and S' of the sound card are respectively obtained as follows:
s′＝iFFT(S′)
wherein iFFT represents the inverse Fourier transform function;
2) Generating a sound field P by driving the partial loudspeakers with a time-domain signal s r ′；
3) Will sound field P r ' sound pressure decibel value and phase at each monitoring point minus P t ' value, a vector containing sound pressure error and phase error is obtained
4) Error vectorIntroducing a feedback equalizer EQ pair P t ' correction is performed to obtain->And input the equalization filter again>And performing cyclic feedback control until the error of the vortex sound beam constructed by the partial loudspeaker is minimized.
CN202310494649.2A 2023-05-05 2023-05-05 Sound field construction system and method with vortex sound beam ultrasonic radiation low-frequency enhancement function Pending CN116506774A (en)

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