CN201182004Y - Microphone with automatic gain control function - Google Patents
Microphone with automatic gain control function Download PDFInfo
- Publication number
- CN201182004Y CN201182004Y CNU2008200566029U CN200820056602U CN201182004Y CN 201182004 Y CN201182004 Y CN 201182004Y CN U2008200566029 U CNU2008200566029 U CN U2008200566029U CN 200820056602 U CN200820056602 U CN 200820056602U CN 201182004 Y CN201182004 Y CN 201182004Y
- Authority
- CN
- China
- Prior art keywords
- microphone
- gain control
- automatic gain
- monitoring unit
- control function
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Control Of Amplification And Gain Control (AREA)
Abstract
The utility model relates to a microphone with the function of automatic gain control. The microphone is provided with an automatic gain control device, the device comprises a monitoring unit and a grain control unit, wherein, the monitoring unit is connected with the input signals of the microphone, monitors the input signals in real time, and outputs control signals when the input signals are greater than a set value; and the grain control unit is connected with the main circuit of the microphone and controls the grain of the microphone according to the output control signals of the monitoring unit. The utility model has the advantage that the sound collected by a user within a certain distance from the microphone keeps constant, namely when a speaker is close to the microphone, the sound of the microphone will not change abruptly but keeps normal; when the speaker is far from the microphone, the sound of the microphone still keeps consistent.
Description
Technical field
The utility model relates to a kind of microphone that has automatic gain control function.
Background technology
Microphone is used to gather outside sound, is one of modal electronic product, and purposes is very extensive.Present microphone, particularly in the video conference application occasion, the participant may explain orally while walking about, and the voice signal of microphone typing can weaken along with the increase of distance like this.And sometimes, near especially from microphone, sound is very big again.
The utility model content
The purpose of this utility model has provided a kind of microphone that has automatic gain control function, has solved to work as sound source hypotelorism, the problem of can occur too loudly, result of use is not good when microphone uses.
For achieving the above object, the utility model has adopted following technical scheme:
The utility model discloses a kind of microphone that has automatic gain control function, comprise microphone, it is characterized in that: microphone is provided with automatic gain control equipment, this device comprises a monitoring unit, be connected with the input signal of microphone, with real-time monitoring input signal, and when input signal greater than set point time output control signal; And a gain control unit, be connected in the microphone main circuit, and the gain of microphone controlled according to the output control signal of monitoring unit.
Described monitoring unit comprises an amplifier chip, and one input end connects the input signal of microphone, another input termination one reference voltage.
Described gain control unit comprises a field effect transistor in parallel with the microphone input circuit, and the output of monitoring unit is connected with the trigger end of this field effect transistor behind a triode.
Wherein, the amplifier chip adopts integrated package 4558D, and field effect transistor adopts technotron J176.
The beneficial effects of the utility model are: make the user remain unchanged at the sound that collects within microphone.Promptly near especially from microphone as the speaker, microphone voice can not suddenly change, and keeps normal sound; And far away apart from the microphone change as the people, the sound of microphone still is consistent.
Description of drawings
Fig. 1 is the electrical block diagram of automatic gain control section of the present utility model.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
A kind of microphone that has automatic gain control function, microphone is provided with automatic gain control equipment, and this device comprises a monitoring unit, is connected with the input signal of microphone, with real-time monitoring input signal, and when input signal greater than set point time output control signal; And a gain control unit, be connected in the microphone main circuit, and the gain of microphone controlled according to the output control signal of monitoring unit.The circuit of automatic gain control equipment as shown in Figure 1.Vcc is+the 5V power supply.Monitoring unit comprises an amplifier chip, and amplifier adopts integrated package 4558D, and resistance R 3, R4 provide direct current to the amplifier in-phase end, and capacitor C 2 filterings exchange clutter, and R7 is used for increasing the stability of input signal.R1, R2 and R5 form see-saw circuit, capacitor C 1, C3 stopping direct current.Gain control unit comprises a technotron J176, when input signal excessive, amplifier 4558D exports control signal, triode 9014 conductings, the grid voltage of technotron J176 is reduced gradually by 5V, resistance reduces between level and the source class thereby cause leaking, and this resistance reduces to weaken input signal, reaches the realization of automatic gain control function.Value that it should be noted that C4 influences the speed that the J176 grid voltage rises, and the value of R9 is related to the speed that this point voltage descends, and therefore, the value of suitably regulating C4 and R9 just can change the sensitivity of this gain control circuit.
Claims (5)
1, a kind of microphone that has automatic gain control function comprises microphone, and it is characterized in that: microphone is provided with automatic gain control equipment, and this device comprises
Monitoring unit is connected with the input signal of microphone, with real-time monitoring input signal, and when input signal greater than set point time output control signal;
And gain control unit, be connected in the microphone main circuit, and the gain of microphone controlled according to the output control signal of monitoring unit.
2, by the described a kind of microphone that has automatic gain control function of claim 1, it is characterized in that: described monitoring unit comprises an amplifier chip, and one input end connects the input signal of microphone, another input termination one reference voltage.
3, by the described a kind of microphone that has automatic gain control function of claim 2, it is characterized in that: described amplifier chip adopts integrated package 4558D.
4, by the described a kind of microphone that has automatic gain control function of claim 1, it is characterized in that: described gain control unit comprises a field effect transistor in parallel with the microphone input circuit, and the output of monitoring unit is connected with the trigger end of this field effect transistor behind a triode.
5, by the described a kind of microphone that has automatic gain control function of claim 4, it is characterized in that: described field effect transistor adopts technotron J176.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200566029U CN201182004Y (en) | 2008-03-26 | 2008-03-26 | Microphone with automatic gain control function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200566029U CN201182004Y (en) | 2008-03-26 | 2008-03-26 | Microphone with automatic gain control function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201182004Y true CN201182004Y (en) | 2009-01-14 |
Family
ID=40251496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200566029U Expired - Lifetime CN201182004Y (en) | 2008-03-26 | 2008-03-26 | Microphone with automatic gain control function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201182004Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102752689A (en) * | 2012-06-28 | 2012-10-24 | 惠州市德赛视听科技有限公司 | Audio power amplifier output gain control device and control method thereof |
| WO2017201868A1 (en) * | 2016-05-26 | 2017-11-30 | 中兴通讯股份有限公司 | Method, apparatus and terminal for adjusting speech gain |
| CN108134974A (en) * | 2017-12-27 | 2018-06-08 | 歌尔股份有限公司 | A kind of microphone and promotion overload acoustic pressure method |
-
2008
- 2008-03-26 CN CNU2008200566029U patent/CN201182004Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102752689A (en) * | 2012-06-28 | 2012-10-24 | 惠州市德赛视听科技有限公司 | Audio power amplifier output gain control device and control method thereof |
| WO2017201868A1 (en) * | 2016-05-26 | 2017-11-30 | 中兴通讯股份有限公司 | Method, apparatus and terminal for adjusting speech gain |
| CN108134974A (en) * | 2017-12-27 | 2018-06-08 | 歌尔股份有限公司 | A kind of microphone and promotion overload acoustic pressure method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 200433 Shanghai City, Yangpu District National Road No. 335 Patentee after: Information Technology Co., Ltd. Shanghai Avcon Address before: 200433 Shanghai City, Yangpu District National Road No. 335 Patentee before: Shanghai Avcon Information Technology Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090114 |