Method for forming directivity in space through utilization of microphone cores which are uniformly arranged in plane according to array
A uniformly arranged, planar array technology, applied in the direction of the microphone mouth/microphone accessories, etc., can solve the problems of shortening the pickup distance, increasing the size of the microphone, and affecting the appearance, so as to achieve the effect of shortening the microphone rod and beautifying the appearance design
Inactive Publication Date: 2018-10-26
SICHUAN HUSHAN ELECTRIC APPLIANCE
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Problems solved by technology
[0002] Usually, microphones and conference systems use a single microphone core device to pick up sound. Although the directivity of the microphone core itself can be selected, the sound pickup distance is relatively short. Generally, it is necessary to use a microphone rod to approach the sound source (hereinafter referred to as " microphone core + microphone rod" method) to shorten the pickup distance
[0003] The use of a microphone rod will increase the size of the microphone and affect the appearance
In addition, using a microphone rod does not substantially improve the directivity of the microphone
Method used
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[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0017] as attached figure 1 Shown, the working principle of the present invention is:
[0018] Several microphone cores are regularly arranged on the plane to receive the sound waves in front together. Assuming that there are (2M+1)×(2N+1) identical microphone core units, the directivity is omnidirectional (or called non-directional), and the distance between adjacent microphone core units is the column pitch d , line spacing l, and the sound source S deviates from the positive angle θ of the microphone core, then the output electrical signals of all the microphone cores are synthesized and output (such as figure 2 ), the signal characteristics are:
[0019] Maximum gain G max =20log 10 [(2N+1)(2M+1)] (Eq.1)
[0020] normalized directivity
[0021]
[0022] In the above formula, ω represents the angular frequency of the signal (unit:...
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The invention discloses a method for forming directivity in space through utilization of microphone cores which are uniformly arranged in a plane according to an array. A plurality of same microphonecores are uniformly arranged in the same plane according to the array, and the microphone cores face a front sound source together. After audio electric signals output by the microphone cores are overlapped through utilization of a circuit, an obtained electric signal has specific space directivity. Through utilization of the method provided by the invention, the directivity is formed, so the microphone cores can pick up voices of a specific direction and attenuate the voice signals of other directions. A microphone rod is reduced, or even the microphone rod can be removed. According to the method of employing the plurality of microphone cores which are uniformly arranged in the plane according to the array, the appearance design of a product can be simplified and beautified.
Description
technical field [0001] The invention relates to a sound pickup method, in particular to a method for forming directivity in space by using microphones uniformly arranged in a plane array, and belongs to the technical field of audio processing. Background technique [0002] Usually, microphones and conference systems use a single microphone core device to pick up sound. Although the directivity of the microphone core itself can be selected, the sound pickup distance is relatively short. Generally, it is necessary to use a microphone rod to approach the sound source (hereinafter referred to as " microphone core + microphone rod" method) to shorten the pickup distance. [0003] However, using a microphone rod will increase the size of the microphone and affect the appearance. In addition, using a microphone does not substantially improve the directivity of the microphone. Contents of the invention [0004] The object of the present invention is to provide a method for formi...
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IPC IPC(8): H04R1/08
CPCH04R1/08
Inventor 曾健房修磊赵春波何梅李超全
Owner SICHUAN HUSHAN ELECTRIC APPLIANCE