Planar spiral microphone array
A microphone array and helical technology, applied in the field of microphone arrays, can solve the problems of affecting detection accuracy, large position error of array elements, and easy change of effective aperture.
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Example Embodiment
[0067] Example 1
[0068] Such as Figure 10-13 As shown, this embodiment provides a planar spiral microphone array composed of a square array body part and four array folding parts. The planar spiral microphone array of this embodiment includes main components such as planar spiral array rigid spokes, support rods, microphones, cameras, and signal acquisition and processing instruments.
[0069] In this embodiment, a microphone mounting hole is designed at each position of the array element, and the mounting hole is fixedly connected to the preamplifier through the array element installation insulating sheath. The design of this mounting seat facilitates the installation of the microphone.
[0070] In order to cooperate with the planar spiral microphone array of this embodiment for data collection, a corresponding hub plug box and a signal conditioning and collection instrument box are also designed. The signal line of each element (ie microphone) is independently fixedly connecte...
Example Embodiment
[0078] Example 2
[0079] This embodiment is basically the same as Embodiment 1. The difference is that the structure of the array body part 12 and the array folding portion 11 of this embodiment is simpler, and is circular and spiral, such as Figure 14 with 15 Shown. This structure changes the number of spokes of the planar spiral microphone array, but the distribution position relationship of the array element sensor is exactly the same as that of Embodiment 1, that is, the array element coordinates are unchanged.
Example Embodiment
[0080] Example 3
[0081] Such as Figure 16 As shown, the plane spiral rigid support has a total of 64 nodes, and all nodes are distributed at a special coordinate. These nodes are located at selected nodes in the intersection of 21 lines evenly spaced in the horizontal direction and 21 lines evenly spaced in the vertical direction. The selected nodes are distributed on 8 spirals, each with 8 array elements. The normalized coordinates are shown in Table 4.
[0082] Table 4 (Spiral array coordinates of array elements distributed on 21×21 cross nodes)
[0083] Array element label
[0084] Array element label
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