CN205883543U - Attenuator circuit and audio equipment based on sound card - Google Patents
Attenuator circuit and audio equipment based on sound card Download PDFInfo
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- CN205883543U CN205883543U CN201620732641.0U CN201620732641U CN205883543U CN 205883543 U CN205883543 U CN 205883543U CN 201620732641 U CN201620732641 U CN 201620732641U CN 205883543 U CN205883543 U CN 205883543U
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- module
- attenuator circuit
- sound card
- resistance
- audio
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Abstract
The utility model belongs to the technical field of the computer, a attenuator circuit and audio equipment based on sound card is provided, this attenuator circuit includes filter module, partial pressure module and filter module, and this attenuator circuit connects the audio amplifier, and in this attenuator circuit, filter module is right high frequency noise and peak interference among the audio signal of audio amplifier output restrain to audio signal after will restraining transmits and carries out the partial pressure for partial pressure module, and the audio signal of filter module after to the partial pressure carries out filtering after that, and the transmission is given the sound card. Realized holding the audio signal's of output magnitude of voltage to attenuate to the line input of audio amplifier from this to the effect handled is carried out for the sound card to the transmission, has solved when having the sound card with speaker connections among the prior art, and the line input end of audio amplifier is by built on stilts problem.
Description
Technical field
This utility model belongs to field of computer technology, particularly relates to a kind of attenuator circuit based on sound card and audio amplifier sets
Standby.
Background technology
At present, along with microelectric technique and the development of informationization technology, computer application in daily life is increasingly
Extensively.But due to the restriction of the factor such as technical merit and production technology, computer equipment in the market with x86 framework is
Main, the most controlled optional kind of production domesticization computer is few, overall performance is low, range is little, causes overall market occupation rate
On the low side.
Production domesticization computer based on 1500A platform of soaring does not has HDA interface, it is therefore desirable to use usb audio to solve this
One problem, CM108B is that a highly integrated single-chip usb audio solves chip.The analog module being necessary is embedded in
CM108B, including internal crystal oscillator, dual pathways DAC and earphone power amplifier, ADC, mike supercharger, PLL, manostat, USB receives and dispatches
Device.Many functions can be programmed by outside EEPROM.The volume supporting HID standard controls.For valued added applications, outside volume solves
Code device or audio frequency DSP may be connected to CM108B by I2S.Pin is further processed.3 GPIO pin are available for programming.
But, the audio jack of desktop computer audio frequency type selecting 3 mouthfuls, support MIC (microphone port), (circuit is defeated for line in
Enter end) and line out (line output), if connecting CM108B according to Reference Design, due to Mic in input voltage
Being about 3mv, and line in input voltage is 500mv, difference probably has 200 times, then cannot be compatible, causes Line In not have
Function.
Therefore, prior art also exists sound card when being connected with audio amplifier, the problem that the line input of audio amplifier is maked somebody a mere figurehead.
Utility model content
This utility model purpose is to provide a kind of attenuator circuit based on sound card and sound-box device, it is intended to solve existing skill
Art also exists sound card when being connected with audio amplifier, the problem that the line input of audio amplifier is maked somebody a mere figurehead.
This utility model provides a kind of attenuator circuit based on sound card, and described attenuator circuit connects audio amplifier, described decay
Circuit includes:
Filtering module, division module and filtration module；
The input of described filtering module connects the line input of described audio amplifier, and the outfan of described filtering module connects
The input of described division module, the outfan of described division module connects the input of described filtration module, described filtering mould
The outfan of block connects described sound card；
High-frequency noise and spike interference in the audio signal that described audio amplifier is exported by described filtering module suppress, and
Carry out dividing potential drop to described division module the audio signal transmission after suppression；
Audio signal after dividing potential drop is filtered by described filtration module, and is transferred to described sound card.
This utility model additionally provides a kind of sound-box device, and including sound card and audio amplifier, described sound-box device also includes as above
State described attenuator circuit.
This utility model provides a kind of attenuator circuit based on sound card and sound-box device, and this attenuator circuit includes filtering mould
Block, division module and filtration module, this attenuator circuit connects audio amplifier, and in this attenuator circuit, filtering module is defeated to described audio amplifier
High-frequency noise and spike interference in the audio signal gone out suppress, and by the audio signal transmission after suppression to division module
Carrying out dividing potential drop, then the audio signal after dividing potential drop is filtered by filtration module, and is transferred to described sound card.It is right to thus achieve
The magnitude of voltage of the audio signal of the line input output of audio amplifier is decayed, and is transferred to the effect that sound card carries out processing, and solves
Prior art of having determined also exists sound card when being connected with audio amplifier, the problem that the line input of audio amplifier is maked somebody a mere figurehead.
Accompanying drawing explanation
The modular structure schematic diagram of the attenuator circuit based on sound card that Fig. 1 provides for this utility model embodiment；
The circuit connection structure schematic diagram of the attenuator circuit based on sound card that Fig. 2 provides for this utility model embodiment.
Fig. 3 is the overall structure schematic diagram that this utility model sound card is connected with audio amplifier.
Detailed description of the invention
In order to make the technical problems to be solved in the utility model, technical scheme and beneficial effect clearer, below
In conjunction with drawings and Examples, this utility model is further elaborated.Should be appreciated that described herein being embodied as
Example, only in order to explain this utility model, is not used to limit this utility model.
Fig. 1 shows the modular structure of the attenuator circuit based on sound card that this utility model embodiment provides, for the ease of
Illustrate, illustrate only the part relevant to this utility model embodiment.
A kind of attenuator circuit based on sound card 101, described attenuator circuit connects audio amplifier 105, and described attenuator circuit includes:
Filtering module 104, division module 103 and filtration module 102；
The input of described filtering module 104 connects the line input of described audio amplifier 105, described filtering module 104
Outfan connects the input of described division module 103, and the outfan of described division module 103 connects described filtration module 102
Input, the outfan of described filtration module 102 connects described sound card 101；
High-frequency noise in the described filtering module 104 audio signal to described audio amplifier 105 is exported and spike disturb into
Row suppression, and carry out dividing potential drop to described division module 103 audio signal transmission after suppression；
Audio signal after dividing potential drop is filtered by described filtration module 102, and is transferred to described sound card 101.
As this utility model one embodiment, a kind of sound-box device, including sound card 101 and audio amplifier 105, described sound-box device
Also include attenuator circuit as described above.
Fig. 2 shows the circuit connection structure of the attenuator circuit based on sound card that this utility model embodiment provides, in order to
It is easy to explanation, illustrate only the part relevant to this utility model embodiment.
As this utility model one embodiment, described filtering module 104 includes magnetic bead FB1,
The input of described magnetic bead FB1 and outfan are respectively input and the outfan of described filtering module 104.
As this utility model one embodiment, described division module 103 includes:
Resistance R2, resistance R3 and resistance R4；
First end of first end of described resistance R2 and described resistance R3 is the outfan of described division module 103 simultaneously,
The second end ground connection of described resistance R2, second end of described resistance R3 is described dividing potential drop mould with first end of described resistance R4 simultaneously
The input of block 103, the second end ground connection of described resistance R4.
As this utility model one embodiment, described filtration module 102 includes:
Resistance R1 and electric capacity C1；
First end of described resistance R1 is the outfan of described filtration module 102, and second termination of described resistance R1 is described
First end of electric capacity C1, second end of described electric capacity C1 is the input of described filtration module 102.
As this utility model one embodiment, described sound card 101 includes audio chip U1,
The receiving terminal MICIN of described audio chip U1 connects the outfan of described filtration module 102.In the present embodiment, sound
Frequently chip U1 have employed the audio chip that model is CM108B, and certainly, the model of audio chip does not limits, if can reach with
Function described in the present embodiment audio chip U1 also may be used.
Work below in conjunction with a kind of based on sound card the attenuator circuit that this utility model embodiment is provided by Fig. 2 and Fig. 3
Principle is described:
First, starting computer, its audio amplifier will work, and microphone port MIC above audio amplifier connects mike, by even
Meeting the receiving terminal MICIN of sound card so that the audio signal transmission of mike processes to sound card, the circuit on same audio amplifier is defeated
Go out to hold Line Out to meet the sound channel end LOR LOL of sound card.But, the audio signal of the line input Line In output of audio amplifier
After high-frequency noise and spike interference are suppressed by filtering module, it is transferred to division module and carries out dividing potential drop, then filter mould
Audio signal after dividing potential drop is filtered by block, and is transferred to the receiving terminal MICIN of described sound card, so makes line input
The magnitude of voltage decay of the audio signal of output, and the multiplexing receiving terminal MICIN of sound card, solve in prior art and also exist
When sound card is connected with audio amplifier, the problem that the line input of audio amplifier is maked somebody a mere figurehead.
In sum, this utility model embodiment provides a kind of attenuator circuit based on sound card and sound-box device, and this declines
Powered down road includes filtering module, division module and filtration module, and this attenuator circuit connects audio amplifier, in this attenuator circuit, filters
High-frequency noise and spike interference in the audio signal that described audio amplifier is exported by module suppress, and by the audio frequency letter after suppression
Number being transferred to division module carries out dividing potential drop, and then the audio signal after dividing potential drop is filtered by filtration module, and is transferred to described
Sound card.The magnitude of voltage of the audio signal thus achieving the output of the line input to audio amplifier is decayed, and is transferred to sound card
Carrying out the effect processed, solve and there is sound card in prior art when being connected with audio amplifier, the line input of audio amplifier is maked somebody a mere figurehead
Problem.This utility model embodiment realizes simple, it is not necessary to increases extra hardware, can effectively reduce cost, have stronger
Usability and practicality.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all at this
Any amendment, equivalent and the improvement etc. made within the spirit of utility model and principle, should be included in this utility model
Protection domain within.
Claims (6)
1. an attenuator circuit based on sound card, described attenuator circuit connects audio amplifier, it is characterised in that described attenuator circuit bag
Include:
Filtering module, division module and filtration module；
The input of described filtering module connects the line input of described audio amplifier, and the outfan of described filtering module connects described
The input of division module, the outfan of described division module connects the input of described filtration module, described filtration module
Outfan connects described sound card；
High-frequency noise and spike interference in the audio signal that described audio amplifier is exported by described filtering module suppress, and will press down
Audio signal transmission after system carries out dividing potential drop to described division module；
Audio signal after dividing potential drop is filtered by described filtration module, and is transferred to described sound card.
2. attenuator circuit as claimed in claim 1, it is characterised in that described filtering module includes magnetic bead FB1,
The input of described magnetic bead FB1 and outfan are respectively input and the outfan of described filtering module.
3. attenuator circuit as claimed in claim 1, it is characterised in that described division module includes:
Resistance R2, resistance R3 and resistance R4；
First end of first end of described resistance R2 and described resistance R3 is the outfan of described division module simultaneously, described resistance
First end of the second end ground connection of R2, second end of described resistance R3 and described resistance R4 is the input of described division module simultaneously
End, the second end ground connection of described resistance R4.
4. attenuator circuit as claimed in claim 1, it is characterised in that described filtration module includes:
Resistance R1 and electric capacity C1；
The outfan that first end is described filtration module of described resistance R1, the second described electric capacity C1's of termination of described resistance R1
First end, the input that the second end is described filtration module of described electric capacity C1.
5. attenuator circuit as claimed in claim 1, it is characterised in that described sound card includes audio chip U1,
The receiving terminal MICIN of described audio chip U1 connects the outfan of described filtration module.
6. a sound-box device, including sound card and audio amplifier, it is characterised in that described sound-box device also includes such as claim 1-5
According to any one of attenuator circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620732641.0U CN205883543U (en) | 2016-07-12 | 2016-07-12 | Attenuator circuit and audio equipment based on sound card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620732641.0U CN205883543U (en) | 2016-07-12 | 2016-07-12 | Attenuator circuit and audio equipment based on sound card |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205883543U true CN205883543U (en) | 2017-01-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620732641.0U Active CN205883543U (en) | 2016-07-12 | 2016-07-12 | Attenuator circuit and audio equipment based on sound card |
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| Country | Link |
|---|---|
| CN (1) | CN205883543U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108062218B (en) * | 2018-01-16 | 2023-12-05 | 北京唱吧科技股份有限公司 | Sound card device |
-
2016
- 2016-07-12 CN CN201620732641.0U patent/CN205883543U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108062218B (en) * | 2018-01-16 | 2023-12-05 | 北京唱吧科技股份有限公司 | Sound card device |
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