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Electret microphone picking up differential signals

An electret microphone and differential signal technology, applied in the field of microphones, can solve the problems of low signal-to-noise ratio and sensitivity, achieve high sensitivity, high signal-to-noise ratio, and effectively amplify differential mode signals.

Active Publication Date: 2013-02-13
SHANDONG GETTOP ACOUSTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an electret microphone for picking up differential signals, which overcomes the defects of low signal-to-noise ratio and low sensitivity in the prior art. After adopting the microphone of the present invention, it has and the advantages of high sensitivity

Method used

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  • Electret microphone picking up differential signals
  • Electret microphone picking up differential signals
  • Electret microphone picking up differential signals

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Example 1, such as image 3 As shown, an electret microphone for picking up differential signals includes a cylindrical shell 13, a sound hole 20 is provided at the bottom of the shell 13, and a dust-proof net 12 is arranged above the sound hole 20, and the dust-proof net 12 is used to isolate External dust and other sundries;

[0044] The top of the dust-proof net 12 is provided with the third annular insulating spacer 11, and the top of the third insulating spacer 11 is provided with the pole plate 10, and the third insulating spacer 11 is used for supporting the pole plate 10 and preventing the pole plate 10 from contacting with the pole plate. Shell 13 contacts;

[0045] The top of the pole plate 10 is provided with an annular second insulating spacer 9, and the top of the second insulating spacer 9 is provided with a vibrating film 6, which is a metal film plated with nickel on both sides. The second insulating spacer 9 is used for Insulate and separate the pole ...

Embodiment 2

[0051] Example 2, such as image 3 As shown, an electret microphone for picking up differential signals includes a cylindrical shell 13, a sound hole 20 is provided at the bottom of the shell 13, and a dust-proof net 12 is arranged above the sound hole 20, and the dust-proof net 12 is used to isolate External dust and other sundries;

[0052] The top of the dust-proof net 12 is provided with the third annular insulating spacer 11, and the top of the third insulating spacer 11 is provided with the pole plate 10, and the third insulating spacer 11 is used for supporting the pole plate 10 and preventing the pole plate 10 from contacting with the pole plate. Shell 13 contacts;

[0053] The top of the pole plate 10 is provided with an annular second insulating spacer 9, and the top of the second insulating spacer 9 is provided with a vibrating film 6, which is a metal film plated with nickel on both sides. The second insulating spacer 9 is used for Insulate and separate the pole ...

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Abstract

The invention relates to an electret microphone picking up differential signals. The electret microphone comprises a shell. The bottom of the shell is provided with sound holes. The top of the shell is provided with a circuit board. An electrode plate is arranged above the sound holes and in the shell. A second insulation gasket is arranged on the electrode plate. A vibration membrane is arranged on the second insulation gasket. A first insulation gasket is arranged on the vibration membrane. A back electrode plate is arranged on the first insulation gasket. The back electrode plate, the vibration membrane and the electrode plate are respectively and electrically connected with the circuit board. The back electrode plate and the vibration membrane form a capacitor. The vibration membrane and the electrode plate form another capacitor. The vibration membrane is connected with the ground. The back electrode plate is connected with an inverted input end of an operational amplifier. The electrode plate is connected with an in-phase input end of the operational amplifier. A differential structure is formed among the back electrode plate, the electrode plate and the vibration membrane, and therefore the electret microphone in differential structure is formed. The electret microphone can effectively amplify different-mode signals and restrain common-mode signals, thereby ensuring effects of a high signal to noise ratio and high sensitivity.

Description

technical field [0001] The invention relates to a microphone, which is suitable for an electret microphone with high signal-to-noise ratio and high sensitivity. Specifically, it relates to an electret microphone for picking up differential signals, which belongs to the technical field of microphones. Background technique [0002] As a kind of microphone, the electret microphone is widely used in telephones, walkie-talkies, voice control equipment, mobile phones, headsets, monitoring equipment, hearing aids, MP3, MP4, digital cameras, etc. due to its small size, wide frequency, and low cost. on electronic products. [0003] The signal-to-noise ratio and sensitivity are important technical indicators of the microphone. The signal-to-noise ratio refers to the ratio of the signal component to the noise component when the microphone is output. In order to hear clearly when recording and amplifying the sound, it is inevitable to increase the amount of amplification. At this time,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R19/01
Inventor 田达亨
Owner SHANDONG GETTOP ACOUSTIC
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