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Anti-radio frequency interference circuit and electret microphone

An electret microphone and radio frequency interference technology, applied in the electronic field, can solve problems such as electronic interference of radio frequency signals, and achieve the effect of reducing electromagnetic interference and reducing ringing

Inactive Publication Date: 2020-10-20
SHENZHEN HORN AUDIO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the embodiment of the present invention provides an anti-radio frequency interference circuit and an electret microphone to solve the problem of electronic interference of radio frequency signals in the electret microphone

Method used

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  • Anti-radio frequency interference circuit and electret microphone
  • Anti-radio frequency interference circuit and electret microphone

Examples

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Embodiment 1

[0035] see figure 1 , an embodiment of the anti-radio frequency interference circuit in the embodiment of the present application includes:

[0036] Acoustic-electric converter and anti-jamming unit;

[0037] The acoustic-electric converter is used to convert the sound pressure signal output by the sound pressure signal source into a voltage source signal, and the anti-interference unit is used to perform anti-radio frequency interference processing on the voltage source signal;

[0038] The anti-interference unit includes: a first resistor R1 and a first capacitor C1;

[0039] One end of the sound pressure signal source is connected to the grid of the acoustic-electric converter by connecting the first resistor R1 in series, and the other end of the sound pressure signal source is grounded after the source of the acoustic-electric converter;

[0040] Exemplarily, in practical applications, the acoustic-electric transducer may be a Field Effect Transistor (FET, FieldEffect T...

Embodiment 2

[0051] see image 3 , an embodiment of the electret microphone in the embodiment of the present application includes:

[0052]The electret microphone in the embodiment of the present application includes: an anti-radio frequency interference circuit, a copper ring, a cavity, a back plate, a gasket, a diaphragm, a casing and a dustproof net.

[0053] For the specific content of the anti-radio frequency interference circuit in the embodiment of the present application, reference may be made to the first embodiment above, which will not be repeated here.

[0054] Exemplarily, in practical applications, the anti-radio frequency interference circuit can integrate all devices on the circuit board through automatic patch technology, thus forming a "circuit board assembly". The circuit board assembly forms an electret microphone by encapsulating all the components with a shell through a pressing method, and realizes converting and outputting sound signals into electrical signals.

...

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Abstract

The invention is applicable to the technical field of electronics, and provides an anti-radio frequency interference circuit and an electret microphone. The anti-radio frequency interference circuit comprises an acoustoelectric converter and an anti-interference unit, the acoustoelectric converter is used for converting an acoustoelectric signal output by an acoustoelectric signal source into a voltage source signal, and the anti-interference unit is used for carrying out anti-radio frequency interference processing on the voltage source signal; the anti-interference unit comprises a first resistor and a first capacitor; one end of the sound pressure signal source is connected with the grid electrode of the acoustoelectric converter through series connection with the first resistor, and the other end of the sound pressure signal source is grounded after being connected with the source electrode of the acoustoelectric converter. A first capacitor is connected in series between the drainelectrode and the source electrode of the acoustoelectric converter.

Description

technical field [0001] The invention belongs to the field of electronic technology, in particular to an anti-radio frequency interference circuit and an electret microphone. Background technique [0002] During the rapid development of mobile portable communication devices such as mobile phones, microphones, which are one of the necessary components of mobile portable communication devices, are placed with higher and higher requirements. [0003] Meanwhile, radio frequency identification (Radio Frequency Identification, RFID) technology and its application are in a period of rapid rise and are widely used in the market. Radio frequency identification is a non-contact automatic identification technology, which automatically identifies target objects and obtains relevant data through radio frequency signals. [0004] Existing electret microphones usually have a low-pass filter composed of a resistor and a capacitor. This structure can suppress radio frequency (200MHz-2GHz) in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R19/01
CPCH04R19/016H04R2201/003
Inventor 李新峰温志锋王丽
Owner SHENZHEN HORN AUDIO
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