CN212588514U

CN212588514U - anti-WIFI interference electret capacitor microphone and terminal

Info

Publication number: CN212588514U
Application number: CN202021461083.1U
Authority: CN
Inventors: 满秩国; 晋学贵; 李定为
Original assignee: Kingstate Electronics Suzhou Co ltd
Current assignee: Kingstate Electronics Suzhou Co ltd
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2021-02-23
Anticipated expiration: 2030-07-22

Abstract

The utility model discloses an anti WIFI interference electret condenser microphone and terminal, through at internal resistance R1 and electric capacity C1 of setting up in microphone epicoele, resistance R1 and electric capacity C1 constitute RC filter circuit, the D of field effect transistor FET is extremely connected with the microphone is anodal through resistance R1, electric capacity C1 ' S anodal is connected with the microphone is anodal, signal output part passes through electric capacity C, power Vs passes through load resistance RL and is anodal with the microphone and be connected, electric capacity C1 ' S negative pole, the S of field effect transistor FET is utmost point, equivalent capacitance ' S negative pole and microphone negative pole are connected, microphone negative pole ground connection. The utility model discloses anti WIFI interference electret condenser microphone is through adding resistance R1 and electric capacity C1 and forming RC filter circuit in the microphone, utilizes RC filter circuit can obviously filtering 2.4GHz &5GHz WIFI to the interference that the microphone produced, solves the too much problem of microphone received WIFI signal interference, reduces the noise among the output signal, reaches the effect that can normally record.

Description

anti-WIFI interference electret capacitor microphone and terminal

Technical Field

The utility model relates to a microphone technical field, in particular to anti WIFI interference electret condenser microphone and terminal.

Background

The application of the microphone in the current market is more and more extensive, the microphone and the loudspeaker are more and more applied to cameras to represent security-protection intelligent homes and the Internet of things, 2.4GHz WIFI &5Hz WIFI is only used in the intelligent homes in a large range and is used for being transmitted to terminals such as mobile phones or computers, and along with the rise of the intelligent homes, as the products are smaller and smaller, the microphone and the WIFI are closer, and when some products apply the selective microphone, the microphone is interfered by the 2.4GHz WIFI &5GHz WIFI, so that the problem of speech recognition is caused,

due to the fact that some products are smaller and smaller, and the limitation of mechanisms and application scenes of the products needs the microphone to resist WIFI interference, the conventional microphone cannot meet the requirement of high-frequency WIFI resistance at present.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide an electret condenser microphone that filtering effect is good, and anti WIFI interference ability is strong.

In order to solve the problem, the utility model provides an anti WIFI interference electret condenser microphone, which comprises a housin, be equipped with PCB circuit board and vibrating diaphragm in the casing, the vibrating diaphragm forms cavity down with the casing cooperation, PCB circuit board, vibrating diaphragm, casing cooperation form the cavity, be equipped with back plate, metal packing ring and field effect transistor FET in the last cavity, the back plate is connected with PCB circuit board electricity, equivalent capacitance is constituteed to vibrating diaphragm, metal packing ring and back plate, still be equipped with resistance R1 and electric capacity C1 in the last cavity, resistance R1 and electric capacity C1 constitute RC filter circuit, the D utmost point of field effect transistor FET passes through resistance R1 and is connected with the microphone positive pole, and electric capacity C1 'S positive pole is connected with the microphone positive pole, and signal output part passes through electric capacity C, and power Vs is connected with the microphone positive pole through load resistance RL, electric capacity C1' S negative pole, the S utmost point of field effect transistor FET, The cathode of the equivalent capacitor is connected with the cathode of the microphone, and the cathode of the microphone is grounded.

As a further improvement of the utility model, the PCB circuit board is three layer construction at least, wherein at least one deck ground connection.

As a further improvement of the present invention, the at least three-layer structure forms a shield with the other circuit packages.

As a further improvement of the present invention, the equivalent capacitor is electrically connected to the PCB through a copper ring.

As a further improvement of the utility model, R1 is more than 0 and less than or equal to 400 ohm, and C1 is more than or equal to 6.8PF and less than or equal to 10 muF.

As a further improvement of the present invention, the load resistance RL is 680-2200 ohms.

As a further improvement of the utility model, the capacitance C is more than or equal to 0.1 muF.

The utility model also provides a terminal, it includes the aforesaid arbitrary anti WIFI interference electret condenser microphone.

The utility model has the advantages that:

the utility model discloses anti WIFI interference electret condenser microphone is through adding resistance R1 and electric capacity C1 and forming RC filter circuit in the microphone, utilizes RC filter circuit can obviously filtering 2.4GHz &5GHz WIFI to the interference that the microphone produced, solves the too much problem of microphone received WIFI signal interference, reduces the noise among the output signal, reaches the effect that can normally record.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic structural diagram of an anti-WIFI interference electret condenser microphone in a preferred embodiment of the present invention;

fig. 2 is a circuit diagram of an anti-WIFI interference electret condenser microphone in a preferred embodiment of the present invention.

Description of the labeling: 10. a housing; 11. a sound receiving hole; 1. a PCB circuit board; 2. vibrating diaphragm; 3. a back plate; 4. a metal washer; 6. and (4) a copper ring.

Detailed Description

The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.

As shown in fig. 1-2, for the utility model discloses anti WIFI in the preferred embodiment disturbs electret condenser microphone, this anti WIFI disturbs electret condenser microphone includes casing 10, be equipped with PCB circuit board 1 and vibrating diaphragm 2 in the casing 10, cavity under vibrating diaphragm 2 and the cooperation of casing 10 formed, be equipped with on the casing 10 with the receipts sound hole 11 of wall body intercommunication down, PCB circuit board 1, vibrating diaphragm 2, the cooperation of casing 10 forms the cavity, be equipped with back plate 3 in the cavity, metal washer 4 and field effect transistor FET, back plate 3 is connected with 1 electricity of PCB circuit board, vibrating diaphragm 2, equivalent capacitance is constituteed to packing ring 4 and back plate 3.

As shown in fig. 2, a resistor R1 and a capacitor C1 are further arranged in the upper cavity, the resistor R1 and the capacitor C1 form an RC filter circuit, the D pole of the FET is connected with the positive pole of the microphone through a resistor R1, the positive pole of the capacitor C1 is connected with the positive pole of the microphone, the signal output end is connected with the positive pole of the microphone through a capacitor C and a power source Vs through a load resistor RL, the negative pole of the capacitor C1, the S pole of the FET and the negative pole of the equivalent capacitor are connected with the negative pole of the microphone, and the negative pole of the microphone is grounded.

The current generated by the power supply Vs reaches the positive electrode of the microphone through the load resistor RL, then the power is supplied to the FET through the RC filter circuit, the sound signal enters the microphone from the sound receiving hole 11 to cause the diaphragm 2 to vibrate, and the electric signal formed by the potential difference generated by the vibration of the diaphragm 2 reaches the positive electrode of the microphone through the RC filter circuit and then passes through the capacitor C to the signal Output terminal Output to Output a signal. Wherein, the field effect transistor FET and the load resistance RL form an amplifying circuit.

The PCB circuit board is of at least three-layer structure, wherein at least one layer is grounded, and the grounding area is increased. At least three layer construction wraps up other circuit and forms the shielding, makes the interference signal of receiving WIFI that other circuit still less, and what can be fundamental solution microphone body received WIFI signal interference is too much problem.

In one embodiment, the equivalent capacitor is electrically connected with the PCB 1 through the copper ring 6.

Preferably, 0< R1 ≦ 400 ohm, 6.8PF ≦ C1 ≦ 10 μ F. The load resistance RL is 680-2200 ohms. The capacitance C is more than or equal to 0.1 muF.

The embodiment of the utility model provides an in still provide a terminal, this terminal includes above-mentioned anti WIFI interference electret condenser microphone.

The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.

Claims

1. An electret condenser microphone capable of resisting WIFI interference comprises a shell, wherein a PCB (printed circuit board) and a vibrating diaphragm are arranged in the shell, the vibrating diaphragm is matched with the shell to form a lower cavity, the PCB, the vibrating diaphragm and the shell are matched to form an upper cavity, a back plate, a metal gasket and a Field Effect Transistor (FET) are arranged in the upper cavity, the back plate is electrically connected with the PCB, and the vibrating diaphragm, the metal gasket and the back plate form an equivalent capacitor, and the electret condenser microphone is characterized in that a resistor R1 and a capacitor C1 are further arranged in the upper cavity, a resistor R1 and a capacitor C1 form an RC filter circuit, a D electrode of the FET is connected with a microphone anode through a resistor R1, an anode of a capacitor C1 is connected with the microphone anode, a signal output end is connected with the microphone anode through a capacitor C and a power supply Vs through a load resistor RL, a cathode of the capacitor C1, an S electrode of the FET and a cathode, the negative pole of the microphone is grounded.

2. The electret condenser microphone for WIFI interference resistance as claimed in claim 1 wherein the PCB board is at least three layers, at least one of which is grounded.

3. The anti-WIFI interference electret capacitor microphone of claim 2 wherein the at least three layers wrap the other wires to form a shield.

4. The electret condenser microphone for WIFI interference resistance of claim 1 wherein the equivalent capacitor is electrically connected to the PCB board through a copper ring.

5. The electret condenser microphone for WIFI interference resistance as claimed in claim 1 wherein 0< R1 ≤ 400 ohm, 6.8PF ≤ C1 ≤ 10 μ F.

6. The electret condenser microphone of claim 1, wherein the load resistance RL is 680-2200 ohms.

7. The electret condenser microphone for resisting WIFI interference of claim 1, wherein the capacitance C is greater than or equal to 0.1 μ F.

8. A terminal comprising an anti-WIFI interference electret condenser microphone according to any of claims 1-7.