Electret sound head shell sound access hole structure and sound transmission method thereof
An electret and capsule technology, which is applied to the sound hole structure of an electret capsule and its sound transmission field, can solve the problem of insufficient low frequency of an electret microphone, achieve a significant compensation effect, improve low frequency, The effect of the overall structure is simple
Inactive Publication Date: 2014-02-05
恩沛音响设备(上海)有限公司
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Problems solved by technology
However, in the current sound head shell, the sound entrance hole of the sound head shell is often opened directly corresponding to the sound entrance hole of the sound head, and in the selection of the diameter, the diameter of the sound entrance hole on the sound head shell is smaller than the diameter of the sound entrance hole of the sound head. Large, such a structure is easy to cause the sound to directly enter the sound inlet hole of the sound head shell directly through the sound inlet hole of the sound head shell, and the technical bottleneck of the low frequency of the electret microphone is not enough
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[0023] The sound head part of a general electret microphone mainly includes sound head housing 1, sound head housing sound inlet hole, sound head 3, sound head sound inlet hole 5 and such as Figure 4 The necessary circuit shown, the upper surface of the sound head 3 is provided with some sound head sound inlet holes 5, and the sound head 3 is placed in the sound head housing 1, and the sound head 3 in the present embodiment is as image 3 As shown, it is a cylindrical configuration, and several sound head sound inlet holes are scattered at equal distances with a central hole combined with several satellite holes.
[0024] The principle of the present invention is mainly to increase the actual propagation distance of the sound from the sound inlet hole of the sound head shell to the sound head sound hole, and realize the change of various technical parameters in the propagation process, such as sound pressure P, sound conformity C a , sound quality M af , sound resistance R ...
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The invention relates to the technical field of sound generation instruments and components, in particular to an electret sound head shell sound access hole structure and a sound transmission method thereof. The sound transmission method is characterized in that sound enters from a sound head shell, one part of the sound directly enters a sound head sound access hole through a semi-circular hole, the other part of the sound is reflected to a compensation plate through the upper surface of a sound head and then reflected by the compensation plate and enters the sound head sound access hole, the process runs in cycle, and therefore strengthening of low frequency and compensation of high frequency can be achieved. Compared with an electret sound head shell sound access hole structure in the prior art, the electret sound head shell sound access hole structure and the sound transmission method thereof have the advantages that the sound path of the sound from the sound head shell sound access hole to a sound head sound access hole is lengthened, acoustic mass Maf becomes large, resonant frequency fh becomes small, frequency response F0 moves forwards, and the technical problem that low frequency is insufficient is solved; in addition, the compensation of high frequency is conducted by additionally arranging the compensation plate according to the reflection mechanism; the sound head shell is simple in overall structure, however, the low-frequency strengthening effect and high-frequency compensation effect are obvious, and the use effect of an electret microphone is improved.
Description
[technical field] [0001] The invention relates to the technical field of pronunciation instrument parts, specifically a structure of the sound inlet hole of the electret head shell that changes the frequency response of the microphone by changing the position of the sound inlet hole of the head shell of the electret microphone and its structure. Sound transmission method. [Background technique] [0002] The dielectric that can maintain the polarization strength for a long time after polarization is called electret. With the advent of electret technology and the continuous improvement of performance, electret technology has gradually replaced the external polarization voltage and has been widely used. [0003] For example, the electret microphone widely used in electrical appliances such as tape recorders and telephones is an example of the application of electret technology. The microphone has the characteristics of small size, simple structure, good electroacoustic performa...
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IPC IPC(8): H04R19/01
Inventor 邹四维
Owner 恩沛音响设备(上海)有限公司