CN203933898U - A kind of VGA CARD is eliminated circuit and active noise reduction earphone - Google Patents
A kind of VGA CARD is eliminated circuit and active noise reduction earphone Download PDFInfo
- Publication number
- CN203933898U CN203933898U CN201420180120.XU CN201420180120U CN203933898U CN 203933898 U CN203933898 U CN 203933898U CN 201420180120 U CN201420180120 U CN 201420180120U CN 203933898 U CN203933898 U CN 203933898U
- Authority
- CN
- China
- Prior art keywords
- module
- output
- electric capacity
- input
- circuit
- 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
Links
- 230000009467 reduction Effects 0.000 title claims abstract description 30
- 230000003321 amplification Effects 0.000 claims abstract description 38
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 38
- 238000001914 filtration Methods 0.000 claims description 24
- 230000008030 elimination Effects 0.000 claims description 6
- 238000003379 elimination reaction Methods 0.000 claims description 6
- 230000003111 delayed effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 239000003990 capacitor Substances 0.000 description 32
- 101710111653 2-methylisocitrate lyase Proteins 0.000 description 2
- 102100026094 C-type lectin domain family 12 member A Human genes 0.000 description 2
- 101710188619 C-type lectin domain family 12 member A Proteins 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Landscapes
- Amplifiers (AREA)
Abstract
The utility model belongs to loudspeaker techniques field, and particularly a kind of VGA CARD is eliminated circuit and active noise reduction earphone.VGA CARD provided by the utility model is eliminated circuit and is connected microphone and audio output circuit, comprises power module, prime amplification module, delay switch module and switching tube; Wherein, the input of prime amplification module connects the output of microphone, and the output of power module connects the input of delay switch module, and the output of delay switch module connects the input of prime amplification module; The input of switching tube, output and controlled end connect respectively the output of prime amplification module, the output of the input of audio output circuit and delay switch module.Due to delay switch module Delayed conducting after chip power, postpone to provide the conducting of reference voltage and switching tube to microphone, the noise producing when prime amplification module is powered on cannot pass through switching tube, thereby has eliminated noise in noise source.
Description
Technical field
The utility model belongs to loudspeaker techniques field, and particularly a kind of VGA CARD is eliminated circuit and active noise reduction earphone.
Background technology
Along with the raising of people's living standard, oneself is more and more higher to the requirement of high-quality music for people.But on the passenger plane of flight or on the automobile that travels, the noise of external environment is often larger.In order to allow user enjoy high-quality music in noisy environment, active noise reduction earphone arises at the historic moment.
Active noise reduction earphone comprises noise reduction process circuit, and due to the complexity of circuit, its volume is often larger, and oneself more and more can not meet the requirement of miniaturization electronic product.For this problem, AMS company has released AS34XX and AS35XX series active noise reduction chip to address this problem.
Yet above-mentioned active noise reduction chip is due to the defect in its design, during start, producing can noise.Although AMS company utilizes the delay circuit that is arranged at transistor base, and transistor collector is discharged over the ground at booting moment, thus the noise producing while suppressing to start shooting; But because triode is chip to be connected to the pin electric discharge of loud speaker, VGA CARD is that the prime amplification module by chip internal produces, and this noise also can continue through processing such as rear class amplifications, and this noise cannot be eliminated completely by triode.
Therefore there is the problem that has noise to produce while starting shooting in the existing active noise reduction earphone of the noise reduction chip of AMS company that adopts.
Utility model content
The purpose of this utility model is to provide a kind of VGA CARD to eliminate circuit, is intended to solve the existing active noise reduction earphone of the noise reduction chip of AMS company that adopts and has the problem that has noise to produce while starting shooting.
The utility model is achieved in that a kind of VGA CARD elimination circuit, connects microphone and audio output circuit, comprises power module and prime amplification module, and the input of described prime amplification module connects the output of described microphone;
Described VGA CARD is eliminated circuit and is also comprised delay switch module and switching tube;
The output of described power module connects the input of described delay switch module, and the output of described delay switch module connects the input of described prime amplification module;
The input of described switching tube, output and controlled end connect respectively the output of described prime amplification module, the output of the input of described audio output circuit and described delay switch module.
Another object of the present utility model is also to provide a kind of active noise reduction earphone, comprises microphone and audio output circuit, and described active noise reduction earphone also comprises above-mentioned VGA CARD elimination circuit.
VGA CARD provided by the utility model is eliminated circuit and is connected microphone and audio output circuit, comprises power module, prime amplification module, delay switch module and switching tube; Wherein, the input of prime amplification module connects the output of microphone, and the output of power module connects the input of delay switch module, and the output of delay switch module connects the input of prime amplification module; The input of switching tube is connected respectively the output of prime amplification module and the input of audio output circuit with output, and the controlled end of switching tube connects the output of delay switch module.Due to delay switch module Delayed conducting after chip power, postpone to provide the conducting of reference voltage and switching tube to microphone, the noise producing when prime amplification module is powered on cannot pass through switching tube, thereby has eliminated noise in noise source.
Accompanying drawing explanation
Fig. 1 is the modular structure figure that VGA CARD provided by the utility model is eliminated the first embodiment of circuit;
Fig. 2 is the modular structure figure that VGA CARD provided by the utility model is eliminated the second embodiment of circuit;
Fig. 3 is the exemplary circuit structure chart that VGA CARD provided by the utility model is eliminated the second embodiment of circuit;
Fig. 4 is the exemplary circuit structure chart of the active noise reduction chip of VGA CARD provided by the utility model the 3rd embodiment that eliminates circuit.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
VGA CARD provided by the utility model is eliminated circuit and is connected microphone and audio output circuit, comprises power module, prime amplification module, delay switch module and switching tube; Solve the existing active noise reduction earphone of the noise reduction chip of AMS company that adopts and had the problem that has noise to produce while starting shooting.
embodiment 1
The VGA CARD that Fig. 1 shows the present embodiment to be provided is eliminated the modular structure of circuit, for convenience of explanation, only shows the part relevant to the present embodiment, and details are as follows:
The VGA CARD that the present embodiment provides is eliminated circuit and is connected microphone 10 and audio output circuit 20.
In the present embodiment, microphone 10 can be traditional dynamic microphones, can be also the microphone that pressure-sensing device forms.Audio output circuit 20 comprises rear class amplifying circuit, control circuit and loud speaker etc., can export anti-phase audio signal according to the external environment noise signal of being exported by microphone 10.
Further, VGA CARD is eliminated circuit can also comprise power module 30 and prime amplification module 40, and the input of prime amplification module 40 connects the output of microphone 10.
In the present embodiment, power module 30 can be other circuit module power supplies, and prime amplification module 40 is the amplifying circuits that consist of a plurality of operational amplifiers.
Further, VGA CARD elimination circuit also comprises delay switch module 50 and switching tube 60.
Concrete, the output of power module 30 connects the input of delay switch module 50, and the output of delay switch module 50 connects the input of prime amplification module 40.The input of switching tube 60, output and controlled end connect respectively the output of the output of prime amplification module 40, the input of audio output circuit 20 and delay switch module 50.
In the present embodiment, due to delay switch module 50 Delayed conducting after chip power, delay provides the conducting of reference voltage and switching tube 60 to microphone 10, the noise producing when prime amplification module 40 is powered on cannot pass through switching tube 60, thereby has eliminated noise in noise source.
embodiment 2
The enforcement of the present embodiment is based upon on the basis of an embodiment.
The VGA CARD that Fig. 2 shows the present embodiment to be provided is eliminated the modular structure of circuit, for convenience of explanation, only shows the part relevant to the present embodiment, and details are as follows:
In the present embodiment, VGA CARD is eliminated circuit and is also comprised the signal filtering module 70 being serially connected with between microphone 10 and prime amplification module 40, and is serially connected with the power filtering module 80 between delay switch module 50 and prime amplification module 40;
Concrete, the input of signal filtering module 70 is connected respectively the output of microphone 10 and the input of prime amplification module 40 with output.The input of power filtering module 80 is connected respectively the output of delay switch module 50 and the input of prime amplification module 40 with input.
In the present embodiment, the ambient noise signal of exporting by 70 pairs of microphones 10 of signal filtering module is done filtering and is processed, to suppress due to voltage spikes.The due to voltage spikes of the electric current of exporting by power filtering module 80 filter out power modules 30.
Further, as shown in Figure 3, delay switch module 50 can comprise:
The first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the first capacitor C 1, PNP triode Q1 and NPN triode Q2;
The collector electrode of PNP triode Q1 is the output of delay switch module 50, the emitter of PNP triode Q1 and the first end of the 3rd resistance R 3 connect the input that forms delay switch module 50 altogether, the second end of the 3rd resistance R 3 and the first end of the first capacitor C 1 are connected to the first end of the second resistance R 2 altogether, the second end of the second resistance R 2 connects the base stage of NPN triode Q2, the collector electrode of NPN triode Q2 connects the first end of the first resistance R 1, the second end of the first resistance R 1 connects the base stage of PNP triode Q1, the emitter of the second end of the first capacitor C 1 and NPN triode Q2 is connected to ground altogether.
In the present embodiment, the electric current that power module 30 is exported, after the 3rd resistance R 3, is the first capacitor C 1 charging.Due to the metering function of the 3rd resistance R 3, the charging interval of the first capacitor C 1 is long, as long as the resistance of the 3rd resistance R 3 and the capacitance of the first capacitor C 1, the charging interval that just can revise the first capacitor C 1 are set.In the charging process of the first capacitor C 1, the voltage on the first end of the first capacitor C 1 slowly increases, and the base voltage of NPN triode Q2 also slowly increases, until meet the on state threshold voltage of NPN triode Q2, NPN triode Q2 conducting.After NPN triode Q2 conducting, output low level signal, to PNP triode Q1, makes its conducting.Thereby the electric current that power module 30 is exported can pass through power filtering module 80, for microphone 10 provides reference voltage 60 conductings of control switch pipe.
Further, as shown in Figure 3, signal filtering module 70 can comprise:
The second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5 and inductance L 1;
The first end of the first end of the first end of the second capacitor C 2, the 3rd capacitor C 3 and inductance L 1 connects the input that forms signal filtering module 70 altogether, the second end of the first end of the first end of the 4th capacitor C 4, the 5th capacitor C 5 and inductance L 1 connects the output that forms signal filtering module 70 altogether, and the second end of the second end of the second end of the second capacitor C 2, the 3rd capacitor C 3, the second end of the 4th capacitor C 4 and the 5th capacitor C 5 is connected to ground altogether.
Further, as shown in Figure 3, power filtering module 80 can comprise:
The 4th resistance R 4, the 6th capacitor C 6 and the 7th capacitor C 7;
The first end of the 4th resistance R 4 is inputs of power filtering module 80, the first end of the second end of the 4th resistance R 4, the first end of the 6th capacitor C 6 and the 7th capacitor C 7 connects the output that forms power filtering module 80 altogether, and the second end of the second end of the 6th capacitor C 6 and the 7th capacitor C 7 is connected to ground altogether.
Further, as shown in Figure 3, switching tube 60 can be NMOS pipe Q3;
Drain electrode, source electrode and the grid of NMOS pipe Q3 are respectively input, output and the controlled end of switching tube 60.
embodiment 3
The enforcement of the present embodiment is based upon on the basis of above-mentioned arbitrary embodiment.
In the present embodiment, as shown in Figure 4, prime amplification module 40 and power module 30 are integrated in an active noise reduction chip U1.
Concrete, the power output end MICS of active noise reduction chip U1 is the output of power module 30, the signal input part MICL of active noise reduction chip U1 and signal output part QMICL are respectively input and the outputs of prime amplification module 40.
Further, as shown in Figure 4, VGA CARD is eliminated circuit can also comprise the 8th capacitor C 8 and the 9th capacitor C 9;
The first end of the 8th capacitor C 8 connects the power output end MICS of active noise reduction chip U1, and the second end ground connection of the 8th capacitor C 8, before the 9th capacitor C 9 is serially connected with the signal input part MICL of active noise reduction chip U1.
Further, the model of active noise reduction chip can be AS3430.
Another object of the present utility model is also to provide a kind of active noise reduction earphone, comprises microphone 10 and audio output circuit 20, and the VGA CARD elimination circuit providing as above-mentioned arbitrary embodiment is also provided.
Further, this active noise reduction earphone can also comprise second microphone and the second audio output circuit, and comprises the second VGA CARD elimination circuit, thereby forms dual-channel headphone.
In the present embodiment.Owing to having adopted above-mentioned VGA CARD to eliminate circuit, this active noise reduction earphone does not have noise and produces when start powers on.
These are only preferred embodiment of the present utility model, not in order to limit the utility model, all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (10)
1. VGA CARD is eliminated a circuit, connects microphone and audio output circuit, comprises power module and prime amplification module, and the input of described prime amplification module connects the output of described microphone; It is characterized in that:
Described VGA CARD is eliminated circuit and is also comprised delay switch module and switching tube;
The output of described power module connects the input of described delay switch module, and the output of described delay switch module connects the input of described prime amplification module;
The input of described switching tube, output and controlled end connect respectively the output of described prime amplification module, the output of the input of described audio output circuit and described delay switch module.
2. VGA CARD as claimed in claim 1 is eliminated circuit, it is characterized in that, described VGA CARD is eliminated circuit and also comprised the signal filtering module being serially connected with between described microphone and described prime amplification module;
The input of described signal filtering module is connected respectively the output of described microphone and the input of described prime amplification module with output.
3. VGA CARD as claimed in claim 1 is eliminated circuit, it is characterized in that, described VGA CARD is eliminated circuit and also comprised the power filtering module being serially connected with between described delay switch module and described prime amplification module;
The input of described power filtering module is connected respectively the output of described delay switch module and the input of described prime amplification module with input.
4. VGA CARD as claimed in claim 1 is eliminated circuit, it is characterized in that, described delay switch module comprises:
The first resistance, the second resistance, the 3rd resistance, the first electric capacity, PNP triode and NPN triode;
The collector electrode of described PNP triode is the output of described delay switch module, the first end of the emitter of described PNP triode and described the 3rd resistance connects the input that forms described delay switch module altogether, the second end of described the 3rd resistance and the first end of described the first electric capacity are connected to the first end of described the second resistance altogether, the second end of described the second resistance connects the base stage of described NPN triode, the collector electrode of described NPN triode connects the first end of described the first resistance, the second end of described the first resistance connects the base stage of described PNP triode, the second end of described the first electric capacity and the emitter of described NPN triode are connected to ground altogether.
5. VGA CARD as claimed in claim 2 is eliminated circuit, it is characterized in that, described signal filtering module comprises:
The second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity and inductance;
The first end of described the second electric capacity, described the 3rd first end of electric capacity and the first end of described inductance connect the input that forms described signal filtering module altogether, the second end of the first end of the first end of described the 4th electric capacity, described the 5th electric capacity and described inductance connects the output that forms described signal filtering module altogether, and the second end of the second end of the second end of described the second electric capacity, described the 3rd electric capacity, the second end of described the 4th electric capacity and described the 5th electric capacity is connected to ground altogether.
6. VGA CARD as claimed in claim 3 is eliminated circuit, it is characterized in that, described power filtering module comprises:
The 4th resistance, the 6th electric capacity and the 7th electric capacity;
The first end of described the 4th resistance is the input of described power filtering module, the first end of the second end of described the 4th resistance, the first end of described the 6th electric capacity and described the 7th electric capacity connects the output that forms described power filtering module altogether, and the second end of the second end of described the 6th electric capacity and described the 7th electric capacity is connected to ground altogether.
7. VGA CARD as claimed in claim 1 is eliminated circuit, it is characterized in that, switching tube is NMOS pipe;
The drain electrode of described NMOS pipe, source electrode and grid are respectively input, output and the controlled ends of described switching tube.
8. VGA CARD as claimed in claim 1 is eliminated circuit, it is characterized in that, described prime amplification module and described power module are integrated in an active noise reduction chip.
9. VGA CARD as claimed in claim 8 is eliminated circuit, it is characterized in that, the model of described active noise reduction chip is AS3430.
10. an active noise reduction earphone, comprises microphone and audio output circuit, it is characterized in that, described active noise reduction earphone also comprises the VGA CARD elimination circuit as described in claim 1 to 9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420180120.XU CN203933898U (en) | 2014-04-14 | 2014-04-14 | A kind of VGA CARD is eliminated circuit and active noise reduction earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420180120.XU CN203933898U (en) | 2014-04-14 | 2014-04-14 | A kind of VGA CARD is eliminated circuit and active noise reduction earphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203933898U true CN203933898U (en) | 2014-11-05 |
Family
ID=51829645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420180120.XU Expired - Lifetime CN203933898U (en) | 2014-04-14 | 2014-04-14 | A kind of VGA CARD is eliminated circuit and active noise reduction earphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203933898U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506986A (en) * | 2014-11-25 | 2015-04-08 | 青岛歌尔声学科技有限公司 | Circuit and method for eliminating pop of active noise reduction earphone and active noise reduction earphone |
| CN107181997A (en) * | 2017-06-21 | 2017-09-19 | 滁州学院 | A kind of audio de-noising circuit and with wheat audio amplifier |
| CN109672949A (en) * | 2017-10-16 | 2019-04-23 | 东莞市美耳电子有限公司 | A kind of active noise reduction call earplug |
| CN110662128A (en) * | 2019-10-15 | 2020-01-07 | 东莞烨嘉电子科技有限公司 | Microphone signal amplification system for active noise reduction |
| CN112866858A (en) * | 2021-01-19 | 2021-05-28 | 维沃移动通信有限公司 | Earphone and noise reduction processing method and device |
-
2014
- 2014-04-14 CN CN201420180120.XU patent/CN203933898U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506986A (en) * | 2014-11-25 | 2015-04-08 | 青岛歌尔声学科技有限公司 | Circuit and method for eliminating pop of active noise reduction earphone and active noise reduction earphone |
| CN107181997A (en) * | 2017-06-21 | 2017-09-19 | 滁州学院 | A kind of audio de-noising circuit and with wheat audio amplifier |
| CN109672949A (en) * | 2017-10-16 | 2019-04-23 | 东莞市美耳电子有限公司 | A kind of active noise reduction call earplug |
| CN110662128A (en) * | 2019-10-15 | 2020-01-07 | 东莞烨嘉电子科技有限公司 | Microphone signal amplification system for active noise reduction |
| CN112866858A (en) * | 2021-01-19 | 2021-05-28 | 维沃移动通信有限公司 | Earphone and noise reduction processing method and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203933898U (en) | A kind of VGA CARD is eliminated circuit and active noise reduction earphone | |
| CN103634439B (en) | Noise reduction process system | |
| CN203537555U (en) | Audio device | |
| CN103974171A (en) | Plosive cancelling circuit | |
| CN202889621U (en) | Interface system for vehicle-mounted electret microphone | |
| CN102118668B (en) | Loudspeaker system and loudspeaker driving circuit | |
| CN115720318A (en) | Automatic noise reduction circuit for sound equipment and control method | |
| CN105451137A (en) | User equipment wake-up method and device | |
| CN205793154U (en) | Earphone drive circuit and electronic equipment | |
| CN203912161U (en) | Noise eliminating circuit | |
| CN104682892A (en) | Audio frequency amplifier used for computer speakers | |
| CN201717940U (en) | Mobile phone provided with hand-free music playing function | |
| CN203984359U (en) | A kind of onboard audio power amplification circuit | |
| CN204721585U (en) | Receiver amplifier | |
| CN203120140U (en) | Audio amplification circuit with standby function | |
| CN203734825U (en) | Audio signal processing circuit and audio playing device | |
| CN203563186U (en) | Noise reduction circuit and voice audio driving circuit provided with same | |
| CN205039785U (en) | Portable instrument's power amplification circuit | |
| CN203104756U (en) | Mute circuit during turning on and off | |
| CN106792359B (en) | Electronic equipment and audio power amplifier system thereof | |
| CN202663531U (en) | Power amplifier device with alt and bass adjustment | |
| CN204993809U (en) | Dual track audio power amplifier circuit | |
| CN205039780U (en) | Take dual power supply's dual track audio power amplifier circuit | |
| CN104300926A (en) | Audio power amplifier used for multimedia electronic equipment | |
| CN107181997A (en) | A kind of audio de-noising circuit and with wheat audio amplifier |
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: Longgang District of Shenzhen City, Guangdong province 518116 Ping Street Takahashi Industrial Park East Area Patentee after: SHENZHEN GRANDSUN ELECTRONIC Co.,Ltd. Address before: Longgang District of Shenzhen City, Guangdong province 518116 Ping Street Takahashi Industrial Park East Area Patentee before: SHENZHEN GRANDSUN ELECTRONIC Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20141105 |
|
| CX01 | Expiry of patent term |