Method for forming directivity in space by linearly-arranged microphone
A microphone and straight-line technology, applied in the field of audio processing, can solve the problems of shortening the pickup distance, short pickup distance, and no substantial improvement in microphone pointing performance, so as to achieve the effect of beautifying the appearance design and shortening the microphone rod
Inactive Publication Date: 2018-10-23
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 extend the length and size of the microphone product 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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[0013] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0014] as attached figure 1 Shown, the working principle of the present invention is:
[0015] Several microphone cores are arranged in a straight line to receive far-field plane sound waves together. Assuming that there are 2N+1 identical microphone core units in total, the directivity is omnidirectional, the distance between adjacent microphone core units is d, and the sound source deviates from the positive angle θ of the microphone cores, then the output current of all microphone cores After the signal is synthesized, the characteristics of the signal are:
[0016] Maximum gain G max =20log 10 (2N+1) (Eq.1)
[0017] normalized directivity
[0018] In the above formula, ω represents the angular frequency of the signal (unit: radian / second), that is, ω=2πf, f represents the signal frequency (unit: Hertz), c represents the speed of sou...
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The invention discloses a method for forming directivity in space by a linearly-arranged microphone. The method is characterized in that a plurality of identical microphone cores are uniformly arranged along a straight line and face a forward sound source together; after an audio electric signal which is output by each microphone core is subjected to superposition processing of a circuit, the obtained electric signal has a specific spatial directional characteristic. By means of the method, the directional characteristic is formed, so that the microphone cores can pick up sound in a specific direction and attenuate sound signals in other directions; and meanwhile, an effect of shortening a microphone rod and even no microphone rod is achieved. In addition, through the method for linearly arranging the microphone cores, the product appearance design can be simplified and beatified.
Description
technical field [0001] The invention relates to a sound pickup method, in particular to a method for forming directivity in space with linearly arranged microphones, 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 extend the length and size of the microphone product, which will 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 im...
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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