CN114390399B - Space low-frequency sound field reconstruction method and reconstruction system - Google Patents
Space low-frequency sound field reconstruction method and reconstruction system Download PDFInfo
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/44—Special adaptations for subaqueous use, e.g. for hydrophone
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
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- 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
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Abstract
The invention discloses a reconstruction method and a reconstruction system of a space low-frequency sound field, wherein the reconstruction method comprises the following steps: 1. sampling the low-frequency sound field S L to be reconstructed by using the highest working frequency f H of the high-frequency sound source to obtain the amplitude A i of each sampling point, wherein i=1, 2, … and N; T is the time length of the low frequency signal S L; 2. selecting a plurality of high-frequency sound sources from a sound array formed by the high-frequency sound sources to transmit high-frequency pulses to a target area, wherein the amplitude of the high-frequency pulse transmitted by the jth high-frequency sound source is A j, and the time delay is The target area is within a remote area of the acoustic array; 3. the high-frequency pulses emitted by the selected high-frequency sound source are overlapped in the target area to form a low-frequency sound field S L. According to the method, a transient low-frequency sound field is formed in space by a transient acoustic superposition method, and the acoustic energy conversion efficiency is high.
Description
Technical Field
The invention belongs to the technical field of acoustic emission in acoustics, and particularly relates to a method and a system for reconstructing a low-frequency sound field by adopting a high-frequency sound source.
Background
With the increasing depth of ocean exploration, there is a wide demand for underwater acoustic transducers, which require low frequency transmitting transducers to meet the characteristics of small size, low weight, high efficiency, etc.
The existing low-frequency underwater acoustic transducer has the defects of large size and weight, inconvenient installation, difficult control of radiation angle and the like. The parametric emission array is a solution in the aspect of low-frequency sound field, but has the defects of low-frequency conversion efficiency and poor sound field controllability.
Disclosure of Invention
The invention aims to: in view of the problems existing in the prior art, the invention provides a method and a system for reconstructing a space low-frequency sound field, wherein the method and the system can form a transient low-frequency sound field in space.
The technical scheme is as follows: the invention discloses a space low-frequency sound field reconstruction method, which comprises the following steps:
S1, sampling a low-frequency sound field S L to be reconstructed at the highest working frequency f H of a high-frequency sound source to obtain the amplitude A i of each sampling point, wherein i=1, 2, … and N; t is the time length of the low frequency signal S L;
S2, when the number of the idle high-frequency sound sources in the sound array is greater than or equal to N, selecting N idle high-frequency sound sources to transmit high-frequency pulses to a target area, wherein the selected high-frequency sound sources are in an occupied state, the amplitude of the high-frequency pulse transmitted by the ith high-frequency sound source is A i, and the time delay is The high-frequency pulse duration is N/f H; after the high-frequency pulse is transmitted, changing the corresponding high-frequency sound source state into idle state; the target area is within a remote area of the acoustic array;
s3, overlapping high-frequency pulses emitted by the selected high-frequency sound source in the target area to form a low-frequency sound field S L.
Further, in the step S2, when the number M of the idle high-frequency sound sources in the sound array is smaller than N, transmitting high-frequency pulses to the target area by using the idle M high-frequency sound sources, and setting the state of the M high-frequency sound sources to be occupied; wherein the amplitude of the high-frequency pulse emitted by the jth high-frequency sound source is A j, and the time delay isThe high-frequency pulse duration is M/f H; the target area is within a remote area of the acoustic array; after the high-frequency pulse is transmitted, changing the corresponding high-frequency sound source state into idle state; j=1, 2, …, M.
Further, in the step S2, when the number M of the idle high-frequency sound sources in the sound array is smaller than N, the idle M high-frequency sound sources are adopted to transmit high-frequency pulses to the target area, specifically: at the position ofEach time selects a free high-frequency sound source to emit a high-frequency pulse s i with the length of K/f H, the amplitude of the high-frequency pulse s i is A i, and the time delay is/>K is more than 10 and less than M; the state of the high-frequency sound source is occupied during the period of transmitting the high-frequency pulse, and the state of the high-frequency sound source is changed into idle after the high-frequency pulse is transmitted.
Preferably, the high-frequency pulse is a sinc signal with a cutoff frequency f H.
Preferably, before the high-frequency sound source emits the high-frequency pulse, emission correction is further included, and the emission correction specifically includes:
S11, setting a signal receiving device in a target area, and transmitting an original high-frequency pulse to the target area by a high-frequency sound source, wherein the receiving device receives the original high-frequency pulse;
s12, performing time reversal on the pulse signals received by the receiving equipment to obtain corrected high-frequency transmitting signals;
s13, the high-frequency sound source takes the corrected high-frequency emission signal as a high-frequency pulse.
Preferably, the acoustic array formed by the high-frequency acoustic source is a horizontal array.
Preferably, the space is underwater, and the horizontal array is located directly above the target area.
On the other hand, the invention also discloses a space low-frequency sound field reconstruction system for realizing the method, which comprises the following steps:
A high-frequency acoustic array 1 constituted by a plurality of high-frequency acoustic sources for emitting high-frequency pulses;
The sampling module 2 is configured to sample the low-frequency sound field S L to be reconstructed at the highest working frequency f H of the high-frequency sound source, and obtain the amplitude a i, i=1, 2, …, N of each sampling point; t is the time length of the low frequency signal S L;
A control module 3 for selecting a plurality of high-frequency sound sources from the high-frequency sound array 1 to emit high-frequency pulses to a target area; when the number of the idle high-frequency sound sources in the sound array is greater than or equal to N, selecting N idle high-frequency sound sources from the N idle high-frequency sound sources to transmit high-frequency pulses to a target area, wherein the selected high-frequency sound sources are in an occupied state, the amplitude of the high-frequency pulse transmitted by the ith high-frequency sound source is A i, and the time delay is The high-frequency pulse duration is N/f H; after the high-frequency pulse is transmitted, changing the corresponding high-frequency sound source state into idle state; the target area is within a remote area of the acoustic array.
Further, when the number M of the idle high-frequency sound sources in the sound array is smaller than N, the control module 3 adopts the idle M high-frequency sound sources to transmit high-frequency pulses to the target area, and sets the state of the M high-frequency sound sources to be occupied; wherein the amplitude of the high-frequency pulse emitted by the jth high-frequency sound source is A j, and the time delay isThe high-frequency pulse duration is M/f H; the target area is within a remote area of the acoustic array; after the high-frequency pulse is transmitted, changing the corresponding high-frequency sound source state into idle state; j=1, 2, …, M.
Further, when the number M of the idle high-frequency sound sources in the sound array is smaller than N, the control module 3 adopts the idle M high-frequency sound sources to transmit high-frequency pulses to the target area, specifically: at the position ofEach time selects a free high-frequency sound source to emit a high-frequency pulse s i with the length of K/f H, the amplitude of the high-frequency pulse s i is A i, and the time delay is/>K is more than 10 and less than M; the state of the high-frequency sound source is occupied during the period of transmitting the high-frequency pulse, and the state of the high-frequency sound source is changed into idle after the high-frequency pulse is transmitted.
The beneficial effects are that: the spatial low-frequency sound field reconstruction method disclosed by the invention has the following advantages: 1. a low-frequency sound source is not needed, and a low-frequency sound field is directly formed after the superposition of the high-frequency sound source; 2. the method does not use nonlinear effect of the sound field, but forms transient low-frequency sound field in space by transient acoustic superposition method. The acoustic energy conversion efficiency is higher than that of a parametric emission array.
Drawings
FIG. 1 is a flow chart of a method for reconstructing a spatial low-frequency sound field;
FIG. 2 is a schematic diagram of a horizontal array of high frequency sound sources;
FIG. 3 is a diagram of the original high frequency pulse transmit and receive waveforms;
FIG. 4 is a graph of corrected high frequency pulse transmit waveforms and receive waveforms;
FIG. 5 is a schematic diagram of high frequency sinc pulse superposition;
FIG. 6 is a waveform diagram of a high frequency sound source transmit signal and a reconstructed low frequency signal in an acoustic array;
FIG. 7 is a two-dimensional sound field simulation diagram;
Fig. 8 is a schematic diagram of the composition of the spatial low-frequency sound field reconstruction system disclosed in the present invention.
Detailed Description
Example 1:
The invention discloses a space low-frequency sound field reconstruction method, and the embodiment takes an underwater space as an example to further clarify the invention. As shown in fig. 1, the specific steps include:
S1, sampling a low-frequency sound field S L to be reconstructed at the highest working frequency f H of a high-frequency sound source to obtain the amplitude A i of each sampling point, wherein i=1, 2, … and N; t is the time length of the low frequency signal S L;
In the embodiment, the highest working frequency f H of the high-frequency sound source is 6kHz, and the low-frequency sound field S L to be reconstructed is a sine wave with the frequency of 235 Hz; since the sine wave is a periodic wave, the value of the time length T thereof is set to the duration of one cycle, i.e., t=1/235; from this, N was calculated to be 26. After the reconstruction of the low-frequency sine wave of one period is completed, the idle high-frequency sound source is utilized to reconstruct the low-frequency sine wave of the next period.
S2, under ideal conditions, the number of the high-frequency sound sources is not less than N, N idle high-frequency sound sources are selected from the sound array formed by the high-frequency sound sources to transmit high-frequency pulses to a target area, the selected high-frequency sound sources are in an occupied state, and the target area is located in a remote area of the sound array; wherein the amplitude of the high-frequency pulse emitted by the ith high-frequency sound source is A i, and the time delay isThe high-frequency cut-off frequency is f H; in this embodiment, a sinc signal, that is, the high-frequency pulse s i emitted by the ith high-frequency sound source is:
according to the formula (1), the length of the high-frequency pulse s i emitted by each high-frequency sound source is N/f H, and after the high-frequency pulse is emitted, the corresponding high-frequency sound source state is changed into idle.
In practical application, the number of high-frequency sound sources in the sound array is smaller than N, or the number of idle high-frequency sound sources is smaller than N, and at the moment, the number of the high-frequency sound sources is smaller than N to reconstruct a low-frequency sound field; in this embodiment, there are 21 high-frequency sound sources in the sound array, numbered 1-21, each of which is independent of the other and has the same working parameters, and the 21 high-frequency sound sources form a horizontal array, which is located right above the target area, as shown in fig. 2. Wherein 19 high frequency sound sources are idle, i.e. 19 high frequency sound fields are used to reconstruct the low frequency sound field. In order to eliminate distortion generated by a signal received by a receiving device, a high-frequency sound source is subjected to emission correction, wherein the emission correction specifically comprises:
s11, setting a signal receiving device in a target area, and transmitting an original high-frequency pulse to the target area by a high-frequency sound source, wherein the signal is a sine signal with a cutoff frequency of f H, and the waveform is shown in fig. 3 (a); the receiving device receives the original high-frequency pulse, and the waveform of the signal received by the receiving device is shown in fig. 3 (b) due to distortion;
s12, performing time reversal on the pulse signal received by the receiving equipment to obtain a corrected high-frequency transmission signal, wherein the waveform of the signal is shown in fig. 4 (a);
S13, the high-frequency sound source uses the corrected high-frequency transmission signal as a high-frequency pulse, in which case the signal waveform received by the receiving apparatus is as shown in fig. 4 (b).
Through the above emission correction, the signal received by the receiving device in the target area is a sinc signal. The high-frequency pulses emitted from the plurality of high-frequency sound sources are superimposed on the target area as shown in fig. 5.
S3, overlapping high-frequency pulses emitted by the selected high-frequency sound source in the target area to form a low-frequency sound field S L.
In this embodiment, idle high-frequency sound sources with numbers of 2-20 are selected, the selected high-frequency sound sources are in an occupied state, and corrected high-frequency transmission signals are transmitted from the middle high-frequency sound source to two sides sequentially at time intervals Δt=1/f H, as shown in fig. 6 (a), and the transmission signals are superimposed in a far-field target region to form a low-frequency sound field
Wherein:
m is the number of idle high-frequency sound sources in the sound array, the length of a high-frequency pulse s j emitted by each high-frequency sound source is M/f H according to the formula (3), and after the high-frequency pulse is emitted, the state of the corresponding high-frequency sound source is changed into idle; in this embodiment, n=26 and m=19, as shown in fig. 6 (b). As shown in fig. 7, a two-dimensional sound field simulation diagram is shown, the horizontal array is located right above the target area, the high-frequency sound field is formed in the two side areas of the far field of the horizontal array, and the low-frequency sound field is formed in the area right below the far field.
The spatial low-frequency sound field reconstruction system for realizing the method is shown in fig. 8, and comprises the following steps:
A high-frequency acoustic array 1 constituted by a plurality of high-frequency acoustic sources for emitting high-frequency pulses;
The sampling module 2 is configured to sample the low-frequency sound field S L to be reconstructed at the highest working frequency f H of the high-frequency sound source, and obtain the amplitude a i, i=1, 2, …, N of each sampling point; t is the time length of the low frequency signal S L;
A control module 3, configured to select multiple idle high-frequency sound sources from the high-frequency sound array 1 to transmit high-frequency pulses to the target area, and select N idle high-frequency sound sources from the sound array to transmit high-frequency pulses to the target area when the number of idle high-frequency sound sources in the sound array is greater than or equal to N, where the selected high-frequency sound source is "occupied", and the amplitude of the high-frequency pulse transmitted by the i-th high-frequency sound source is a i, and the time delay is The high-frequency pulse duration is N/f H; after the high-frequency pulse is transmitted, changing the corresponding high-frequency sound source state into idle state; the target area is within a remote area of the acoustic array.
When the number M of the idle high-frequency sound sources in the sound array is smaller than N, the control module 3 adopts the idle M high-frequency sound sources to transmit high-frequency pulses to a target area, and sets the states of the M high-frequency sound sources as occupied; wherein the amplitude of the high-frequency pulse emitted by the jth high-frequency sound source is A j, and the time delay isThe high-frequency pulse duration is M/f H; the target area is within a remote area of the acoustic array; after the high-frequency pulse is transmitted, changing the corresponding high-frequency sound source state into idle state; j=1, 2, …, M. Example 2:
This example is the same as example 1, according to The calculated n=26, the available free high-frequency sound sources m=19 in the sound array, i.e. m=19; the reconstruction step of the low-frequency sound field S L at this time is as follows:
At the position of Each of these N times selects an idle high frequency sound source to emit a high frequency pulse s i (i=1, 2, …, N) of length K/f H:
The state of the high-frequency sound source is occupied during the period of transmitting the high-frequency pulse, and the state of the high-frequency sound source is changed into idle after the high-frequency pulse is transmitted.
At the first M moments, i.eAt the moments, an idle high-frequency sound source is certainly arranged in the sound array for selection; at/>At the moment, at least the high-frequency sound source emitting the high-frequency pulse at the moment 0 is changed from occupied to idle, so that the duration K/f H of the high-frequency pulse is smaller than/>Namely: k is less than M. However, the duration of the high-frequency pulses must not be too small, and K > 10 is usually set. And so on, from/>To/>The high-frequency sound sources which are changed into the idle state again are adopted to emit high-frequency pulses at the moments, so that the high-frequency sound sources in the sound array are reused, and the utilization rate of the array resources is improved.
Correspondingly, in the space low-frequency sound field reconstruction system, when the number M of idle high-frequency sound sources in the sound array is smaller than N, the control module 3 adopts the idle M high-frequency sound sources to transmit high-frequency pulses to the target area, specifically: at the position ofEach time selects a free high-frequency sound source to emit a high-frequency pulse s i with the length of K/f H, the amplitude of the high-frequency pulse s i is A i, and the time delay is/>K is more than 10 and less than M; the state of the high-frequency sound source is occupied during the period of transmitting the high-frequency pulse, and the state of the high-frequency sound source is changed into idle after the high-frequency pulse is transmitted.
Claims (9)
1. A method for reconstructing a spatial low frequency sound field, comprising:
S1, sampling a low-frequency sound field S L to be reconstructed at the highest working frequency f H of a high-frequency sound source to obtain the amplitude A i of each sampling point, wherein i=1, 2, … and N; t is the time length of the low frequency signal S L;
S2, when the number of the idle high-frequency sound sources in the sound array is greater than or equal to N, selecting N idle high-frequency sound sources from the sound array to transmit high-frequency pulses to a target area, wherein the state of the selected high-frequency sound sources is 'occupied', the amplitude of the high-frequency pulse transmitted by the ith high-frequency sound source is A i, and the time delay is The high-frequency pulse duration is N/f H; after the high-frequency pulse is transmitted, changing the corresponding high-frequency sound source state into idle state; the target area is within a remote area of the acoustic array;
s3, overlapping high-frequency pulses emitted by the selected high-frequency sound source in a target area to form a low-frequency sound field S L;
The high-frequency pulse is a sine signal with the cutoff frequency of f H.
2. The method according to claim 1, wherein in the step S2, when the number M of the vacant high-frequency sound sources in the sound array is smaller than N, the vacant M high-frequency sound sources are adopted to transmit high-frequency pulses to the target area, and the state of the M high-frequency sound sources is set as "occupied"; wherein the amplitude of the high-frequency pulse emitted by the jth high-frequency sound source is A j, and the time delay isThe high-frequency pulse duration is M/f H; the target area is within a remote area of the acoustic array; after the high-frequency pulse is transmitted, changing the corresponding high-frequency sound source state into idle state; j=1, 2, …, M.
3. The method for reconstructing a spatial low-frequency sound field according to claim 1, wherein in the step S2, when the number M of the vacant high-frequency sound sources in the sound array is smaller than N, the vacant M high-frequency sound sources are adopted to transmit high-frequency pulses to the target area, specifically: at the position ofEach time selects a free high-frequency sound source to emit a high-frequency pulse s i with the length of K/f H, the amplitude of the high-frequency pulse s i is A i, and the time delay is/>K is more than 10 and less than M; the state of the high-frequency sound source is occupied during the period of transmitting the high-frequency pulse, and the state of the high-frequency sound source is changed into idle after the high-frequency pulse is transmitted.
4. The method for reconstructing a spatial low-frequency sound field according to claim 1, wherein the high-frequency sound source further comprises emission correction before emitting the high-frequency pulse, and the emission correction specifically comprises:
S11, setting a signal receiving device in a target area, and transmitting an original high-frequency pulse to the target area by a high-frequency sound source, wherein the receiving device receives the original high-frequency pulse;
s12, performing time reversal on the pulse signals received by the receiving equipment to obtain corrected high-frequency transmitting signals;
s13, the high-frequency sound source takes the corrected high-frequency emission signal as a high-frequency pulse.
5. The method for reconstructing a spatial low-frequency sound field according to claim 1, wherein the sound array formed by the high-frequency sound sources is a horizontal array.
6. The method of reconstructing a spatial low frequency sound field according to claim 5, wherein the space is underwater and the horizontal array is located directly above a target area.
7. A spatial low frequency sound field reconstruction system, comprising:
a high-frequency acoustic array (1) composed of a plurality of high-frequency acoustic sources for emitting high-frequency pulses;
The sampling module (2) is used for sampling the low-frequency sound field S L to be reconstructed at the highest working frequency f H of the high-frequency sound source to obtain the amplitude A i, i=1, 2, … and N of each sampling point; t is the time length of the low frequency signal S L;
A control module (3) for selecting a plurality of idle high-frequency sound sources from the high-frequency sound array (1) to transmit high-frequency pulses to a target area; when the number of the idle high-frequency sound sources in the sound array is greater than or equal to N, selecting N idle high-frequency sound sources from the N idle high-frequency sound sources to transmit high-frequency pulses to a target area, wherein the selected high-frequency sound sources are in an occupied state, the amplitude of the high-frequency pulse transmitted by the ith high-frequency sound source is A i, and the time delay is The high-frequency pulse duration is N/f H; after the high-frequency pulse is transmitted, changing the corresponding high-frequency sound source state into idle state; the target area is within a remote area of the acoustic array; the high-frequency pulse emitted by the selected high-frequency sound source is overlapped in the target area to form a low-frequency sound field S L;
The high-frequency pulse is a sine signal with the cutoff frequency of f H.
8. The spatial low-frequency sound field reconstruction system according to claim 7, wherein when the number M of vacant high-frequency sound sources in the sound array is smaller than N, the control module (3) transmits high-frequency pulses to the target area using M vacant high-frequency sound sources, and sets the M high-frequency sound source states to "occupied"; wherein the amplitude of the high-frequency pulse emitted by the jth high-frequency sound source is A j, and the time delay isThe high-frequency pulse duration is M/f H; the target area is within a remote area of the acoustic array; after the high-frequency pulse is transmitted, changing the corresponding high-frequency sound source state into idle state; j=1, 2, …, M.
9. The spatial low-frequency sound field reconstruction system according to claim 7, wherein when the number M of vacant high-frequency sound sources in the sound array is smaller than N, the control module (3) adopts the vacant M high-frequency sound sources to transmit high-frequency pulses to the target area, specifically: at the position ofEach time selects a free high-frequency sound source to emit a high-frequency pulse s i with the length of K/f H, the amplitude of the high-frequency pulse s i is A i, and the time delay is/>K is more than 10 and less than M; the state of the high-frequency sound source is occupied during the period of transmitting the high-frequency pulse, and the state of the high-frequency sound source is changed into idle after the high-frequency pulse is transmitted.
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| CN114390399A (en) | 2022-04-22 |
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