CN103227971A - Multi-mode dimensional microphone array adopting two-way spiral distribution - Google Patents
Multi-mode dimensional microphone array adopting two-way spiral distribution Download PDFInfo
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Abstract
The invention relates to a multi-mode dimensional microphone array adopting two-way spiral distribution, which is technically characterized in that the multi-mode dimensional microphone array comprises a main frame, flanks and array element nodes; the flanks are installed on the side edge of the main frame in a folding manner in the anteroposterior direction; the main frame and the flanks are combined through planar rigid supports; in addition, the array element nodes are installed on eight anti-clockwise rotation spirals and four clockwise rotation spirals, and are also installed at intersections of the eight anti-clockwise rotation spirals and the four clockwise rotation spirals, wherein the eight anti-clockwise rotation spirals and the four clockwise rotation spirals take a central point as a circle center. The flanks can form at least nine arrays that are stable and have excellent performances when being folded in the anteroposterior direction, array elements are distributed in a two-way spiral manner, coordinates of the array elements achieve high accuracy and are not easy to change, sound localization accuracy is high, and virtual images are small; the other eight modes of the arrays have certain three dimensional sound localization capacity except the first mode, and can be suitable for measuring equipment with different noise source distribution shapes; and meanwhile, the flanks are folded backwards so as to form a horizontal combination, and then are packed after being stacked and pressed with the main frame, so that the flanks are convenient to be installed in a packaging box and are convenient to carry and transport.
Description
Technical field
The invention belongs to acoustic measurement microphone array field, the multimode stereoscopic microphone array that especially a kind of bidirectional screw distributes.
Background technology
Microphone array is the index of a pair of contradiction to the acoustic image cross frequence lower limit of noise testing with the no virtual image measuring frequency upper limit, the former is the resolution capability decision by array, microphone array can tell the low-limit frequency of two sound sources, its theoretical value is that the wavelength of lower-frequency limit correspondence should be less than array aperture, the latter is by the minimum array element distance decision of array, be defined as the highest frequency that does not occur the virtual image in the camera angular field of view, its theoretical value is that the wavelength of upper frequency limit correspondence is not less than minimum spacing.Because separating, acoustic image distinguishes that the rate lower limit is by the aperture decision of array, and there is not virtual image upper frequency limit is by the decision of the density of battle array upper sensor, thereby have three inter-related problems: (1) is in order to reduce separable lower-frequency limit, the aperture that needs expanded matrix, so with array do very big; (2) owing to the limited amount of array upper sensor, after enlarging the aperture, the reduction of the closeness of transducer causes pitch enlargement, and then array is reduced the imaging measurement upper frequency limit of high-frequency sound, when measuring high frequency, occurs the virtual image easily; (3) before and after planar array is hard to tell, caused general snail battle array in use to be subjected to a lot of limitations.Present all sensor array products, comprise Denmark B﹠K company pizza battle array, MON-SN type three ring arrays of Belgium LMS company, Germany GiFi company ring array, the snail battle array of Germany BBM company, the snail array of Germany Head Acoustic, the Nor848 planar array of Norway Nor Sonic company, the 48channel Ring Array of U.S. Acoustic Camera company, the AcVs type battle array of France ACB company, the snail battle array of Korea S SM Instruments company, 48 yuan of spiral three-dimensional arrays of France CAE Inc., the snail battle array of Beijing popularity company and lattice framing battle array, the InSYS2010 type snail battle array of Acoustical Inst., Chinese Academy of Sciences, Beijing Century is thought 8 * 8 planar rectangular battle arrays of wound acoustic technique Co., Ltd, 10 * 10 planar rectangular battle arrays of Zhanghe, Guangzhou company, 5 * 5 planar rectangular battle arrays of Beijing Orient vibration and noise research institute, 36 yuan of snail battle arrays of Beijing Shen Zhou Pu Hui company, the planar array spiral battle array experimental provision of Peking University, the rectangle battle array experimental provision of Tsing-Hua University, the ring array experimental provisions that the west worker is big etc. are plane formation product both at home and abroad, all do not accomplish both to have reduced under the acoustic image cross frequence to be limited to 200Hz, can make no virtual image upper frequency limit reach 20kHz again.
U.S. Pat 6473514B1 discloses a kind of folding equally distributed linear array, the whiplike structure of its similar more piece, and formation is simple, and positioning function is not strong, does not have multiple folding operating state yet, and folding mainly is transportation for convenience.WO2008/040991A3 discloses the array that a kind of spheric harmonic function method of reseptance that utilizes many sensors spatial folding to distribute obtains the accurate sound pressure level of space broadband sound field, the characteristics of this array are array element transducer non-directives, and array is not to have formed certain spatial gain, can not realize the imaging of sound source is detected.
In sum, existing microphone array all is relatively-stationary form, does not have the variable three-dimensional microphone array of multi-mode, can not be simultaneously takes into account the requirement that enlarges the aperture and improve the array element closeness at the measurement of space two-dimensional sound field and three-dimensional sound field.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of Stability Analysis of Structures, form is changeable, precision is high, the measuring frequency wide ranges, have total space resolution capability, can obtain the multimode stereoscopic microphone array that the sonographic bidirectional screw of the different depth of field distributes.
The present invention solves its technical problem and takes following technical scheme to realize:
The multimode stereoscopic microphone array that a kind of bidirectional screw distributes, comprise main frame, flank and array element node, described flank can be installed on the main frame side front and back foldedly, described main frame and flank are the planar rigidity holder combination, and it is on eight helicals that are rotated counterclockwise in the center of circle, four helicals that turn clockwise and on the crosspoint of two kinds of helicals that described array element node is installed in the central point.
And the quantity of described array element node is 80, on every counterclockwise helical and every the helical that turns clockwise 8 array elements is arranged all, and all array element nodes are installed on the edge of planar rigidity support.
And, described array element node comprises that array element microphone, array element base amplifier, array element are installed dead ring, array element is installed locking swivel nut and array element signals line, the array element microphone is installed on the array element base amplifier, this array element base amplifier is installed dead ring and array element by array element and the locking swivel nut is installed is installed in the installing hole that the planar array rigid support is provided with, and described array element signals line passes the endoporus that array element installs the locking swivel nut and drawn.
And the quantity of described flank is 1,2,3 or 4.
And, described flank is connected with main frame by three folding hinges, folding vertical columns and be connected with flank before on the planar array rigid support of main frame front side, being equipped with by folding rigid bracing, the folding vertical columns in back is installed on the planar array rigid support of main frame rear side and is connected with flank by folding rigid bracing, the folding rigid bracing by different length makes flank and main frame be fixed as different angles with realization at least 9 array mode of operations.
And the center, front side of described main frame is equipped with the array camera, and this array camera is by being installed in the centre bore of main frame by the camera installation sleeve.
And, be laid with four light filling lamps on the planar rigidity support around the described array camera.
And, a main supporting disk is installed by four centre posts in the back center position of described main frame, this main supporting disk tiltedly draws support bar to be connected with the planar array rigid support of main frame by four, connect a threaded collar in the outside of main supporting disk, on this threaded collar, be connected with loose joint, connect a main stay pipe by this loose joint.
And described array element microphone is 1/4 inch or 1/2 inch measuring microphone.
And the material of described planar array rigid support is aluminium alloy, stainless steel or fiberglass, and perhaps other can guarantee that the enough rigidity of array bracket can material.
Advantage of the present invention and good effect are:
1, to be a kind of rigid support width be the array that double helix distributes less than behind 12mm open and flat to this microphone array, the battle array body duty ratio planar of the array of open and flat back diameter 1m has only 13%, the battle array body duty ratio planar of open and flat back diameter 2m array has only 6%, and is therefore little of ignoring to the influence of acoustic field.On this basis, can realize multiple multi-form array, realize the solid array of various modes, both can make it can distinguish front and back, can realize separable Measurement and analysis again high-frequency sound by folded array.
2, the position of the array element microphone of this microphone array has two kinds of reverse each other helixes to distribute, and helps improving detection accuracy, reduces the virtual image.
3, this microphone array has the mode of operation more than nine kinds, the array of each form has measurement advantage separately, open and flat shape mode of operation can be carried out the acoustic image of two dimension and be measured, the solid array pattern that is folded to form, can carry out three-dimensional acoustic imaging and measure, can carry out axially accurately location sound source.
4, the support of this microphone array adopts full rigid structure, and three folding hinges can guarantee that folding back structure is solid and reliable, have avoided the formation error.
5, after the flank of this microphone array folds back into horizontal combination, stack packing with main frame, reduced size is convenient to be installed in the packing case, is convenient for carrying transportation.
Description of drawings
Fig. 1 is a positive blast distribution map of the present invention;
Fig. 2 is a blast distribution map in the back side of the present invention;
Fig. 3 is the blast distribution map of array element node of the present invention;
Fig. 4 is that the installation of main frame of the present invention and flank concerns schematic diagram;
Fig. 5 is the front view (a) and the rearview (b) of first kind of pattern of the present invention;
Fig. 6 is the front view (a) and the rearview (b) of second kind of pattern of the present invention;
Fig. 7 is the front view (a) and the rearview (b) of the third pattern of the present invention;
Fig. 8 is the front view (a) and the rearview (b) of the 4th kind of pattern of the present invention;
Fig. 9 is the front view (a) and the rearview (b) of the 5th kind of pattern of the present invention;
Figure 10 is the front view (a) and the rearview (b) of the 6th kind of pattern of the present invention;
Figure 11 is the front view (a) and the rearview (b) of the 7th kind of pattern of the present invention;
Figure 12 is the front view (a) and the rearview (b) of the 8th kind of pattern of the present invention;
Figure 13 is the front view (a) and the rearview (b) of the 9th kind of pattern of the present invention;
Figure 14 is array element and the helical distribution relation schematic diagram of the present invention under first kind of mode of operation;
Figure 15 be the present invention under second kind of mode of operation array element and helical distribution relation schematic diagram;
Figure 16 is the detection wave beam contrast to the 2kHz sound of 1m distance of first kind of pattern of the present invention and second kind of pattern;
Figure 17 is first kind of pattern of the present invention (a) and second kind of pattern (b) the imaging comparison diagram to the 2kHz sound of 1m distance;
Figure 18 is the detection wave beam contrast to the 6kHz sound of 1m distance of first kind of pattern of the present invention and second kind of pattern;
Figure 19 is first kind of pattern of the present invention (a) and second kind of pattern (b) the imaging comparison diagram to the 6kHz sound of 1m distance;
Figure 20 is the detection wave beam contrast to the 10kHz sound of 1m distance of first kind of pattern of the present invention and second kind of pattern;
Figure 21 is first kind of pattern of the present invention (a) and second kind of pattern (b) the imaging comparison diagram to the 10kHz sound of 1m distance;
Figure 22 is that nine kinds of pattern arrays are surveyed sensing comparative figure to the omnirange of the 2kHz sound of 30cm distance;
Figure 23 is that nine kinds of pattern arrays are surveyed sensing comparative figure to the omnirange of the 6kHz sound of 30cm distance.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
The multimode stereoscopic microphone array that a kind of bidirectional screw distributes as shown in Figure 1 to Figure 3, comprises main frame 9, four flanks 10 and is installed in array element node on main frame and the flank, described four flanks can before and after be installed in foldedly around the main frame.Described main frame and flank constitute by planar rigidity support 8, and the concrete annexation of main frame and four flanks is: the main frame outside links together by three folding hinges 11 and four flanks, and this three foldings hinge fixes by latch 15.Folding vertical columns 16 and be connected with flank before on the planar array rigid support of main frame front side, being symmetrically installed with four by folding rigid bracing 21; Folding vertical columns 14 and be connected with flank after being symmetrically installed with four on the planar array rigid support of main frame rear side by folding rigid bracing 21.An array camera 5 is installed by camera installation sleeve 6 in center, front side at main frame, and this center is the center of array, and its optical surface is the basic side of the coordinate of array.On four symmetric positions of the planar array rigid support of main frame front side, 4 light filling lamps 7 are installed, are used for increasing brightness than under the dark situation.By four centre posts 12 17, four centre posts of a main supporting disk being installed in the back center position of main frame is connected and fixed with main supporting disk is vertical; A main stay pipe 20 is installed in the outside of main supporting disk, its concrete annexation is: the outside of main supporting disk connects a threaded collar 18, on this threaded collar, be connected with loose joint 19, be connected with main stay pipe by this loose joint, being laid with four other ends that tiltedly draw 13, four of support bars tiltedly to draw support bar around main supporting disk is fixed on the planar array rigid support of main frame.In the present embodiment, the width of planar array rigid support is about 12mm, thickness 6mm, can adopt material such as aluminium alloy, stainless steel, fiberglass, width can be reduced to 5mm when adopting steel, even littler, also can adopt other can guarantee that array bracket has enough rigidity energy materials.
80 array element nodes are installed on the planar rigidity support of main frame and flank altogether, it is on eight helicals that are rotated counterclockwise in the center of circle, four helicals that turn clockwise and on the crosspoint of two kinds of helicals that these array element nodes are positioned at the central point, on every counterclockwise helical and every the helical that turns clockwise 8 array element nodes are arranged all, the array element on two kinds of helicals overlaps.As shown in Figure 4, each array element node comprises that array element microphone 1, array element base amplifier 2, array element are installed dead ring 3, array element is installed locking swivel nut 4 and array element signals line, described array element microphone 1 is installed on the array element base amplifier, this array element base amplifier is installed dead ring and array element by array element and the locking swivel nut is installed is installed in the installing hole that the planar array rigid support is provided with, the array element signals line passes the endoporus of array element installation locking swivel nut and is drawn, and the array element number of nodes can reduce according to practical application.The array element microphone adopts 1/4 inch or the 1/2 inch measuring microphone that has array element base amplifier, the about 25mm of the total height of array element node.
Four flanks can before and after be folded to form multiple mode of operation, be nine kinds of mode of operations using always as Fig. 5 to Figure 13, be that 1 meter three-dimensional microphone array describes with diameter below:
First kind of mode of operation, as shown in Figure 5, four flank horizontal developments are also injected the hole internal fixation of three folding hinges with latch, form first kind of mode of operation.The array element layout of first kind of mode of operation as shown in figure 14, the numbering that array element is outwards dispersed arrangement from the battle array center on the counterclockwise helical is followed successively by: article one has S0, S1, S2, S3, S4, S5, S6, S7, second has S8, S9, S10, S11, S12, S13, S14, S15, article three, S16 is arranged, S17, S18, S19, S20, S21, S22, S23, article four, S24 is arranged, S25, S26, S27, S28, S29, S30, S31, article five, S32 is arranged, S33, S34, S35, S36, S37, S38, S39, article six, S40 is arranged, S41, S42, S43, S44, S45, S46, S47, article seven, S48 is arranged, S49, S50, S51, S52, S53, S54, S55, the 8th has S56, S57, S58, S59, S60, S61, S62, S63; The numbering that array element is outwards dispersed arrangement from the battle array center on the clockwise helical is followed successively by: article one has S69, S25, S68, S17, S11, S66, S67, S6, second has S73, S41, S72, S33, S27, S70, S71, S22, article three, S77, S57, S76, S49, S43, S74, S75, S38 are arranged, and the 4th has S65, S9, S64, S1, S59, S78, S79, S54.Article four, there is part array element node to intersect in clockwise helical and eight counterclockwise helicals.
After four flanks of open and flat back diameter 1m battle array launched fully, the array element coordinate was as shown in the table:
Equal proportion is amplified the pore size that the array element coordinate figure just can change array, and the version of array also can change to some extent, for example, will just obtain the bidirectional screw microphone array of diameter 2m behind the array element coordinate on duty 2.Guaranteeing that the array lattice framing width of present embodiment is enough thin under the prerequisite of enough rigidity, the duty ratio when being designed to diameter 1m array is about 13%, the duty ratio about 6% when being designed to the array of diameter 2m.
Second kind of mode of operation, as shown in Figure 6, flank folds back and makes main frame and flank be in folding coincidence status, and flank is connected with the folding vertical columns in back.This pattern is a solid array, and the spacing of flank and main frame is 18mm, and flank array element microphone and main frame array element microphone one spacing are 68mm, its array element layout as shown in figure 15, its array element coordinate is as shown in the table.
This pattern is a kind of looser parallel battle array combination, increased the array element closeness in the detection plane, help reducing the measurement virtual image to high-frequency sound, and then make 3dB under this pattern not have the virtual image measuring frequency upper limit to bring up to 24kHz, 5dB does not have the virtual image measuring frequency upper limit and brings up to 18kHz, enlarged the applying frequency scope of microphone array, but its separating power to low-frequency sound descends to some extent, make the separable lower-frequency limit under this pattern bring up to 600Hz, be used with first kind of mode of operation and can make the separable lower-frequency limit of 1m battle array be reduced to 320Hz, 3dB does not have the virtual image measuring frequency upper limit and brings up to 24kHz, correspondingly, be used with first kind of mode of operation and can make the separable lower-frequency limit of 2m battle array be reduced to 200Hz, 3dB does not have the virtual image measuring frequency upper limit and brings up to 15kHz.
The third mode of operation, as shown in Figure 7, flank folds back and becomes 315 ° of angles to form three-dimensional array with main frame, and flank is connected by the folding vertical columns in folding rigid bracing and back.This pattern is compared first kind of pattern has increased the interior array element closeness of detection plane, helps reducing the measurement virtual image to high-frequency sound, has enlarged the applying frequency scope of microphone array, but its separating power to low-frequency sound slightly descends to some extent.
The 4th kind of mode of operation, as shown in Figure 8, flank folds back and becomes 270 ° of angles to form three-dimensional array with main frame, and flank is connected by the folding vertical columns in folding rigid bracing and back.This pattern is compared first kind of pattern has increased the interior array element closeness of detection plane, help reducing the measurement virtual image to high-frequency sound, enlarged the applying frequency scope of microphone array, and the stationkeeping ability to depth direction sound source is the highest in all patterns, but its separating power to low-frequency sound slightly descends to some extent.
The 5th kind of mode of operation, as shown in Figure 9, flank folds back and becomes 225 ° of angles to form three-dimensional array with main frame, and flank is connected by the folding vertical columns in folding rigid bracing and back.This pattern is compared first kind of pattern has increased the interior array element closeness of detection plane, helps reducing the measurement virtual image to high-frequency sound, has enlarged the applying frequency scope of microphone array, but its separating power to low-frequency sound slightly descends to some extent.
The 6th kind of mode of operation, as shown in figure 10, flank is folding forward to become 135 ° of angles to form three-dimensional array with main frame, and flank is connected with preceding folding vertical columns by folding rigid bracing.This pattern is compared first kind of pattern has increased the interior array element closeness of detection plane, helps reducing the measurement virtual image to high-frequency sound, has enlarged the applying frequency scope of microphone array, but its separating power to low-frequency sound slightly descends to some extent.
The 7th kind of mode of operation, as shown in figure 11, flank is folding forward to become 90 ° of angles to form three-dimensional array with main frame, and flank is connected with preceding folding vertical columns by folding rigid bracing.This pattern is compared first kind of pattern has increased the interior array element closeness of detection plane, help reducing the measurement virtual image to high-frequency sound, enlarged the applying frequency scope of microphone array, and the stationkeeping ability to depth direction sound source is the highest in all patterns, or be used for measured target is carried out the measurement of encirclement formula, but its separating power to low-frequency sound slightly descends to some extent.
The 8th kind of mode of operation, as shown in figure 12, flank is folding forward to form three-dimensional array with main frame angle at 45, and flank is connected with preceding folding vertical columns by folding rigid bracing.This pattern is compared first kind of pattern has increased the interior array element closeness of detection plane, helps reducing the measurement virtual image to high-frequency sound, has enlarged the applying frequency scope of microphone array, but its separating power to low-frequency sound slightly descends to some extent.
The 9th kind of mode of operation, as shown in figure 13, flank is folding forward complete when parallel with main frame, makes main frame and flank be in folding coincidence status, and flank is connected with preceding folding vertical columns.This pattern is a solid array, and the spacing of flank and main frame is 30mm, flank array element microphone and main frame array element microphone interlaced arrangement, and the array element interplanar distance is 20mm.This pattern is the tightest a kind of parallel battle array combination of playing, increased the array element closeness in the detection plane, help reducing the measurement virtual image to high-frequency sound, and then the 3dB that makes the 1m battle array does not have the virtual image measuring frequency upper limit and brings up to 24kHz, enlarged the applying frequency scope of microphone array, but its separating power to low-frequency sound descends to some extent, the separable lower-frequency limit of this pattern 1m battle array has been brought up to 600Hz, be used with first kind of mode of operation and can make the separable lower-frequency limit of 1m battle array be reduced to 320Hz, 3dB does not have the virtual image measuring frequency upper limit and brings up to 24kHz, correspondingly, be used with first kind of mode of operation and can make the separable lower-frequency limit of 2m battle array be reduced to 200Hz, 3dB does not have the virtual image measuring frequency upper limit and brings up to 15kHz.
In the technique scheme, flank can form other more array patterns to forward and backward folding when forming other angles with main frame.
Microphone array of the present invention has different space exploration performances under different mode, wherein first kind of pattern has best spatial resolution to sound source in two-dimensional space, acoustic image cross frequence lower limit is minimum, is applicable to the measurement all-bottom sound, but sound source before and after can not distinguishing.Second kind of pattern has the highest no virtual image measuring frequency upper limit, be applicable to the measurement high-frequency sound, and has certain front and back resolution capability, but there is certain a few acoustic image measuring frequency trap, the acoustic imaging resolution pole is low near the Frequency point of acoustic image measuring frequency trap correspondence, the localization of sound ability of the odd-multiple of the corresponding half-wavelength of double-deck front spacing is the poorest, and spacing is big more, exists the frequency of acoustic image measuring frequency trap low more.Figure 16,18,20 is respectively that first kind of pattern of multimode stereoscopic microphone array and second kind of pattern that 80 yuan of bidirectional screws of diameter 1m distribute contrasts the detection wave beam of 2kHz, 6kHz, 10kHz sound respectively.Dotted line is first kind of pattern array beam among the figure, solid line is second kind of pattern array beam, from curve as can be seen second kind of pattern in the beam side lobe level of each frequency than the low about 5dB of first kind of pattern, in ± 40 ° of angular field's scopes, first kind of pattern equates with main lobe to the secondary lobe of 8kHz sound, illustrate that its no virtual image upper limiting frequency scope is lower than 8kHz, and in ± 40 ° of angular field's scopes, second kind of pattern to the secondary lobe of 16kHz sound still than the low 3dB of main lobe, have only the detection beam side lobe to 24kHz sound to equate with main lobe, the 3dB that second kind of pattern be described does not have virtual image upper limiting frequency and can reach 20kHz at least.Figure 17,19, the 21st, first kind of pattern of multimode stereoscopic microphone array (left side) that 80 yuan of bidirectional screws of diameter 1m distribute and second kind of pattern (right side) contrast the imaging of 2kHz, 6kHz, 10kHz sound respectively.The left figure of wherein every width of cloth figure is the image of first kind of pattern battle array, right figure is the image of second kind of pattern battle array, by contrast as can be seen, for low-frequency sound, the image of second kind of pattern is thicker than the image of first kind of pattern, show that its spatial resolution is low, but contrast as can be seen from image to high-frequency sound, in ± 40 ° of angular field's scopes, imaging measurement for same frequency sound, the quantity that the virtual image of first kind of pattern occurs is more than second kind of pattern, and the virtual image intensity of second kind of pattern of virtual image strength ratio of first kind of pattern is bigger.
The third pattern has identical acoustic image cross frequence lower limit with second kind of pattern, and the no virtual image measuring frequency upper limit is lower slightly, and noiseless picture measuring frequency trap phenomenon has certain front and back resolution capability.The 4th kind of pattern has identical acoustic image cross frequence lower limit with second kind of pattern, and the no virtual image measuring frequency upper limit is identical with first kind of pattern, and noiseless picture measuring frequency trap phenomenon has best front and back resolution capability.The 5th kind of pattern and acoustic image cross frequence lower limit are between first kind of pattern and second kind of pattern, and the no virtual image measuring frequency upper limit and first kind of pattern are approaching, and noiseless picture measuring frequency trap phenomenon has certain front and back resolution capability.The 6th kind of pattern and acoustic image cross frequence lower limit are between first kind of pattern and second kind of pattern, the no virtual image measuring frequency upper limit and first kind of pattern are approaching, noiseless picture measuring frequency trap phenomenon has certain front and back resolution capability, is applicable to the sound of encirclement formula measurement than large equipment.The 7th kind of pattern has identical acoustic image cross frequence lower limit with second kind of pattern, the no virtual image measuring frequency upper limit is identical with first kind of pattern, noiseless picture measuring frequency trap phenomenon has best front and back resolution capability, is applicable to the sound of encirclement formula measurement than skinny device.The 8th kind of pattern has identical acoustic image cross frequence lower limit with second kind of pattern, and the no virtual image measuring frequency upper limit is lower slightly, and noiseless picture measuring frequency trap phenomenon has certain front and back resolution capability.The 9th kind of pattern has the higher no virtual image measuring frequency upper limit, is applicable to the measurement high-frequency sound, the front and back resolution capability than second kind of pattern a little less than, but exist the frequency of acoustic image measuring frequency trap higher.
It is that the omnirange of 2kHz, 6kHz sound is surveyed the directive property comparison diagram that Figure 22,23 has provided adjust the distance the respectively frequency at 30cm place of first kind to the 9th kind pattern array respectively.Therefrom as can be seen, except that first kind of pattern, the detection directive property of other various modes has stronger spatial selectivity, but the contrast differences of its main lobe and secondary lobe has nothing in common with each other, each is also inequality for the contrast differences of main lobe and back lobe, illustrates to select different patterns can realize different Effect on Detecting.
It is emphasized that; embodiment of the present invention is illustrative; rather than it is determinate; as array element quantity can be various ways such as 64 or 48; therefore the present invention includes and be not limited to the embodiment described in the embodiment; every other execution modes that drawn by those skilled in the art's technical scheme according to the present invention belong to the scope of protection of the invention equally.
Claims (10)
1. the multimode stereoscopic microphone array that distributes of a bidirectional screw, it is characterized in that: comprise main frame, flank and array element node, described flank can be installed on the main frame side front and back foldedly, described main frame and flank are the planar rigidity holder combination, and it is on eight helicals that are rotated counterclockwise in the center of circle, four helicals that turn clockwise and on the crosspoint of two kinds of helicals that described array element node is installed in the central point.
2. the multimode stereoscopic microphone array that a kind of bidirectional screw according to claim 1 distributes, it is characterized in that: the quantity of described array element node is 80, on every counterclockwise helical and every the helical that turns clockwise 8 array elements are arranged all, all array element nodes are installed on the edge of planar rigidity support.
3. the multimode stereoscopic microphone array that a kind of bidirectional screw according to claim 1 and 2 distributes, it is characterized in that: described array element node comprises that array element microphone, array element base amplifier, array element are installed dead ring, array element is installed locking swivel nut and array element signals line, the array element microphone is installed on the array element base amplifier, this array element base amplifier is installed dead ring and array element by array element and the locking swivel nut is installed is installed in the installing hole that the planar array rigid support is provided with, and described array element signals line passes the endoporus that array element installs the locking swivel nut and drawn.
4. the multimode stereoscopic microphone array that a kind of bidirectional screw according to claim 1 distributes, it is characterized in that: the quantity of described flank is 1,2,3 or 4.
5. the multimode stereoscopic microphone array that a kind of bidirectional screw according to claim 1 distributes, it is characterized in that: described flank is connected with main frame by three folding hinges, folding vertical columns and be connected with flank before on the planar array rigid support of main frame front side, being equipped with by folding rigid bracing, the folding vertical columns in back is installed on the planar array rigid support of main frame rear side and is connected with flank by folding rigid bracing, the folding rigid bracing by different length makes flank and main frame be fixed as different angles with realization at least 9 array mode of operations.
6. the multimode stereoscopic microphone array that a kind of bidirectional screw according to claim 1 distributes, it is characterized in that: the center, front side of described main frame is equipped with the array camera, and this array camera is installed in the centre bore of main frame by the camera installation sleeve.
7. the multimode stereoscopic microphone array that a kind of bidirectional screw according to claim 6 distributes is characterized in that: be laid with four light filling lamps on the planar rigidity support around the described array camera.
8. the multimode stereoscopic microphone array that a kind of bidirectional screw according to claim 1 distributes, it is characterized in that: a main supporting disk is installed by four centre posts in the back center position of described main frame, this main supporting disk tiltedly draws support bar to be connected with the planar array rigid support of main frame by four, connect a threaded collar in the outside of main supporting disk, on this threaded collar, be connected with loose joint, connect a main stay pipe by this loose joint.
9. the multimode stereoscopic microphone array that a kind of bidirectional screw according to claim 1 distributes, it is characterized in that: described array element microphone is 1/4 inch or 1/2 inch measuring microphone.
10. the multimode stereoscopic microphone array that a kind of bidirectional screw according to claim 1 distributes is characterized in that: the material of described planar array rigid support is that aluminium alloy, stainless steel or fiberglass and other can guarantee that array has the material of better rigidity.
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