CN205491098U - Audio input filter circuit - Google Patents
Audio input filter circuit Download PDFInfo
- Publication number
- CN205491098U CN205491098U CN201620271117.8U CN201620271117U CN205491098U CN 205491098 U CN205491098 U CN 205491098U CN 201620271117 U CN201620271117 U CN 201620271117U CN 205491098 U CN205491098 U CN 205491098U
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- China
- Prior art keywords
- electric capacity
- resistance
- filter circuit
- suppression diode
- audio frequency
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Abstract
The utility model discloses an audio input filter circuit, this input filter circuit include that the first output of microphone links to each other with 601 transient -suppression diode's first end, the first end of the 601st, 604, 605 electric capacity and the first end of the 601st resistance respectively, the second output of microphone links to each other with 602 transient -suppression diode's first end, the first end of the 602nd, 606 electric capacity, the second end of the 605th electric capacity and the first end of the 602nd resistance respectively, the second end of the 601st resistance links to each other with the first end of the 603rd electric capacity and the first end of the 600th resistance respectively, and the second end of the 602nd resistance links to each other with the second end of the 603rd electric capacity and the first end of the 603rd resistance respectively, 601st, the second end of 602 electric capacity corresponds with an audio input end and the 2nd audio input end of treater continuously respectively. The utility model discloses can carry out filtering to the audio signal of input and handle, obtain better incoming signal.
Description
Technical field
This utility model relates to a kind of filter circuit, particularly relates to a kind of audio frequency input filter circuit.
Background technology
Filter circuit includes low-pass filter circuit: allow low frequency signal to pass through, but weakens (or minimizing) frequency
Signal higher than cut-off frequency；High-pass filtering circuit: allow high-frequency signal to pass through, but weaken (or minimizing)
The wave filter that frequency is passed through less than cut-off frequency signal；Bandwidth-limited circuit: allow the letter of particular frequency range
Number pass through；Rejector circuit: stop the signal of particular frequency range to pass through；All-pass wave filtering circuit: produce
Time delay effect.
These filter circuits are limited by inductance, electric capacity volume size, and inductance, capacitance can not be very big, filter
After ripple, the most old part ripple and electrical noise pass to load, and the wave filter of passive device composition always has one
Scope ripple electrical noise cannot filter.
One audio input/output circuit of the most correct design is conducive to the process of audio signal, and obtain is steady
Fixed input/output signal, is that we show a difficult problem the most urgently to be resolved hurrily.
Utility model content
This utility model is intended at least solve technical problem present in prior art, the most innovatively proposes
A kind of audio frequency input filter circuit.
In order to realize above-mentioned purpose of the present utility model, this utility model provides a kind of audio frequency input filter electricity
Road, this audio frequency input filter circuit includes at least one mike, and the first outfan of mike is respectively with
First end of 604 electric capacity (C604), the first end of the 605th electric capacity (C605), the 601st resistance (R601)
The first end and the 601st electric capacity (C601) the first end be connected；Second outfan of mike is respectively with
First end of 606 electric capacity (C606), the second end of the 605th electric capacity (C605), the 602nd resistance (R602)
The first end and the 602nd electric capacity (C602) the first end be connected；Second end of the 601st resistance (R601)
It is connected with the first end of the 603rd electric capacity (C603) and the first end of the 600th resistance (R600) respectively, the
Second end of 602 resistance (R602) respectively with the second end and the 603rd resistance (R603) of the 603rd electric capacity (C603)
The first end be connected；Second end of the 604th electric capacity (C604), the second end of the 606th electric capacity (C606),
Second end of the 600th resistance (R600) and the second end of the 603rd resistance (R603) are connected to the ground respectively；
Second end of the 601st electric capacity (C601) and the second end difference correspondence and process of the 602nd electric capacity (C602)
First audio input end of device and the second audio input end are connected.
The filter effect of this circuit makes the signal stabilization of input.
In a kind of preferred implementation of the present utility model, also include audio frequency output filter circuit, this audio frequency
Output filter circuit includes speaker, the first input end of speaker respectively with the 628th electric capacity (C628)
First end, the first end of the 627th electric capacity (C627) are connected with the first audio output of processor；Raise one's voice
Second input of device respectively with the first end of the 629th electric capacity (C629), the 627th electric capacity (C627)
Second end is connected with the second audio output of processor；Second end and the 629th of the 628th electric capacity (C628)
Second end of electric capacity (C629) is connected to the ground respectively.
This filter circuit enables to the signal stabilization of output.
In a kind of preferred implementation of the present utility model, also including power supply circuits, these power supply circuits include
1503rd transducer, the power input of the 1503rd transducer (U1503) respectively with power supply and the 1514th
First end of electric capacity (C1514) is connected, and the control Enable Pin of the 1503rd transducer (U1503) is respectively with the
First end of 1517 resistance (R1517), the first end of the 1518th resistance (R1518) and the 1501st 3 pole
The colelctor electrode of pipe (Q1501) is connected, and the power output end of the 1503rd transducer (U1503) is respectively with the 1516th
First end of electric capacity (C1516) is connected with load, second end and the 1501st of the 1518th resistance (R1518)
The base stage of audion (Q1501) is connected with the control Enable Pin of processor respectively, the 1503rd transducer (U1503)
Earth terminal, the second end of the 1514th electric capacity (C1514), the transmitting of the 1501st audion (Q1501)
Second end of pole and the 1516th electric capacity (C1516) is connected to the ground respectively.
There is provided stable voltage for input and output filter circuit, and can be controlled whether to defeated by processor
The microphone/speaker entered in output filter circuit is powered, and saves energy.
In a kind of preferred implementation of the present utility model, also include the 601st Transient Suppression Diode (V601)
With the 602nd Transient Suppression Diode (V602), the first end of the 601st Transient Suppression Diode (V601) with
First outfan of mike is connected, the first end of the 602nd Transient Suppression Diode (V602) and mike
The second outfan be connected, the second end and the 602nd transient state of the 601st Transient Suppression Diode (V601) press down
Second end of diode processed (V602) is connected to the ground respectively.
Desirably prevent voltage excessive, damage circuit.
In a kind of preferred implementation of the present utility model, also include the 607th Transient Suppression Diode (V607)
With the 608th Transient Suppression Diode (V608), the first end of the 607th Transient Suppression Diode (V607) with
The first input end of speaker is connected, the first end of the 608th Transient Suppression Diode (V608) and speaker
The second input be connected, the second end and the 608th transient state of the 607th Transient Suppression Diode (V607) press down
Second end of diode processed (V608) is connected to the ground respectively.
In sum, owing to have employed technique scheme, the beneficial effects of the utility model are: this practicality
Novel can to input audio signal be filtered process, obtain better input signal.
Accompanying drawing explanation
Fig. 1 is this utility model audio frequency input filter circuit connection diagram.
Fig. 2 is this utility model audio frequency output filter circuit connection diagram.
Fig. 3 is this utility model power supply circuits connection diagram.
Detailed description of the invention
Of the present utility model embodiment is described below in detail, and the example of described embodiment is shown in the drawings, its
In the most same or similar label represent same or similar element or there is same or like function
Element.The embodiment described below with reference to accompanying drawing is exemplary, is only used for explaining this utility model,
And it is not intended that to restriction of the present utility model.
In description of the present utility model, unless otherwise prescribed and limit, " the peace it should be noted that term
Dress ", should be interpreted broadly " being connected ", " connection ", for example, it may be mechanical connection or electrically connect, it is possible to
To be the connection of two element internals, can be to be joined directly together, it is also possible to be indirectly connected to by intermediary,
For the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
This utility model provides a kind of audio frequency input filter circuit, as it is shown in figure 1, this audio frequency input filter
Circuit includes at least one mike MIC600, MIC601, and the first outfan of mike is respectively with the 604th
First end of electric capacity C604, first end of the 605th electric capacity C605, first end of the 601st resistance R601 and
First end of the 601st electric capacity C601 is connected；Second outfan of mike respectively with the 606th electric capacity C606
The first end, second end of the 605th electric capacity C605, first end of the 602nd resistance R602 and the 602nd electricity
The first end holding C602 is connected；Second end of the 601st resistance R601 respectively with the of the 603rd electric capacity C603
One end is connected with first end of the 600th resistance R600, and second end of the 602nd resistance R602 is respectively with the 603rd
Second end of electric capacity C603 and first end of the 603rd resistance R603 are connected；The second of 604th electric capacity C604
End, second end of the 606th electric capacity C606, second end of the 600th resistance R600 and the 603rd resistance R603
The second end be connected to the ground respectively；Second end of the 601st electric capacity C601 and the second of the 602nd electric capacity C602
End correspondence respectively is connected with the first audio input end and second audio input end of processor.In present embodiment
In, also include the 601st Transient Suppression Diode V601 and the 602nd Transient Suppression Diode V602, the 601st
First end of Transient Suppression Diode V601 is connected with the first outfan of mike, the 602nd transient state suppression two
First end of pole pipe V602 is connected with the second outfan of mike, the 601st Transient Suppression Diode V601
The second end and second end of the 602nd Transient Suppression Diode V602 be connected to the ground respectively.
In a kind of preferred implementation of the present utility model, as in figure 2 it is shown, also include audio frequency output filtering
Circuit, this audio frequency output filter circuit includes that speaker SPK600, the first input end of speaker SPK600 divide
Not with first end of the 628th electric capacity C628, first end of the 627th electric capacity C627 and the first sound of processor
Frequently outfan is connected；Second input of speaker SPK600 respectively with first end of the 629th electric capacity C629,
Second end of the 627th electric capacity C627 is connected with the second audio output of processor；628th electric capacity C628
The second end and second end of the 629th electric capacity C629 be connected to the ground respectively.In the present embodiment, also include
607th Transient Suppression Diode V607 and the 608th Transient Suppression Diode V608, the 607th transient state suppression two
First end of pole pipe V607 is connected with the first input end of speaker, the 608th Transient Suppression Diode V608
The first end be connected with the second input of speaker, second end of the 607th Transient Suppression Diode V607 and
Second end of the 608th Transient Suppression Diode V608 is connected to the ground respectively.
In a kind of preferred implementation of the present utility model, also include π type filter circuit, π type filtered electrical
Road is connected in audio frequency input filter circuit.In the present embodiment, π type filter circuit includes the 601st electricity
Sense, the 607th electric capacity and the 608th electric capacity, it specifically connects: the first end of the 601st inductance is respectively with the 601st
First end of resistance and the first end of the 607th electric capacity are connected, and the second end of the 601st inductance is respectively with the 601st
First end of electric capacity and the first end of the 608th electric capacity are connected, the second end of the 607th electric capacity and the 608th electric capacity
The second end be connected to the ground respectively.This π type filter circuit is not limited to connect position in this place, it is also possible to series connection
On other positions of audio frequency input circuit or audio frequency output loop.
In a kind of preferred implementation of the present utility model, also include L-type filter circuit, L-type filter circuit
It is connected in audio frequency input filter circuit.In the present embodiment, L-type filter circuit include the 609th electric capacity and
602nd inductance, the first end of the 602nd inductance respectively with the first end of the 601st resistance and the 609th electric capacity
First end is connected, and the second end of the 602nd inductance and the first end of the 601st electric capacity are connected, the 609th electric capacity
Second end is connected to the ground.This L-type filter circuit can also be connected on audio frequency input circuit or audio frequency exports back
On other positions on road, filter effect is more preferable, and therefore not to repeat here.
In a kind of preferred implementation of the present utility model, as it is shown on figure 3, also include power supply circuits, should
Power supply circuits include the 1503rd transducer, and in the present embodiment, the 1503rd transducer is BL9198 series
One of transducer, concrete selection model is BL9198-28BAPRN, and processor uses MT6261.1503rd
The power input of transducer U1503 the first end with power supply and the 1514th electric capacity C1514 respectively is connected, and
The control Enable Pin of 1503 transducer U1503 respectively with first end of the 1517th resistance R1517, the 1518th
First end of resistance R1518 and the colelctor electrode of the 1501st audion Q1501 are connected, the 1503rd transducer U1503
Power output end (power supply of such as transducer is defeated with first end of the 1516th electric capacity C1516 and load respectively
Go out end to be connected with the power end of mike and speaker) connected, second end of the 1518th resistance R1518 and the
The base stage of 1501 audion Q1501 is connected with the control Enable Pin of processor respectively, the 1503rd transducer U1503
Earth terminal, second end of the 1514th electric capacity C1514, the emitter stage of the 1501st audion Q1501 and
Second end of 1516 electric capacity C1516 is connected to the ground respectively.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ",
The description of " concrete example " or " some examples " etc. means to combine the concrete spy of this embodiment or example description
Levy, structure, material or feature are contained at least one embodiment of the present utility model or example.At this
In description, the schematic representation of above-mentioned term is not necessarily referring to identical embodiment or example.And,
The specific features, structure, material or the feature that describe can be in any one or more embodiments or examples
In combine in an appropriate manner.
Embodiment the most of the present utility model, those of ordinary skill in the art is permissible
Understand: can these embodiments be carried out multiple in the case of without departing from principle of the present utility model and objective
Changing, revise, replace and modification, scope of the present utility model is limited by claim and equivalent thereof.
Claims (5)
1. an audio frequency input filter circuit, it is characterised in that this audio frequency input filter circuit includes at least
Individual mike, the first outfan of mike respectively with the first end of the 604th electric capacity (C604), the 605th
First end of electric capacity (C605), the first end of the 601st resistance (R601) and the 601st electric capacity (C601)
The first end be connected；Second outfan of mike respectively with the first end of the 606th electric capacity (C606),
Second end of 605 electric capacity (C605), the first end of the 602nd resistance (R602) and the 602nd electric capacity (C602)
The first end be connected；Second end of the 601st resistance (R601) respectively with the of the 603rd electric capacity (C603)
One end is connected with the first end of the 600th resistance (R600), and the second end of the 602nd resistance (R602) is respectively
It is connected with the second end of the 603rd electric capacity (C603) and the first end of the 603rd resistance (R603)；604th
Second end of electric capacity (C604), the second end of the 606th electric capacity (C606), the 600th resistance (R600)
The second end and the second end of the 603rd resistance (R603) be connected to the ground respectively；601st electric capacity (C601)
The second end and the second end respectively corresponding first audio input end with processor of the 602nd electric capacity (C602)
It is connected with the second audio input end.
Audio frequency input filter circuit the most according to claim 1, it is characterised in that also include that audio frequency is defeated
Going out filter circuit, this audio frequency output filter circuit includes speaker, and the first input end of speaker is respectively with
First end of 628 electric capacity (C628), the first end of the 627th electric capacity (C627) and the first audio frequency of processor
Outfan is connected；Second input of speaker respectively with the first end of the 629th electric capacity (C629), the 627th
Second end of electric capacity (C627) is connected with the second audio output of processor；628th electric capacity (C628)
The second end and the second end of the 629th electric capacity (C629) be connected to the ground respectively.
Audio frequency input filter circuit the most according to claim 1 and 2, it is characterised in that also include supplying
Electricity circuit, these power supply circuits include the 1503rd transducer, the power supply input of the 1503rd transducer (U1503)
End the first end with power supply and the 1514th electric capacity (C1514) respectively is connected, the 1503rd transducer (U1503)
Control Enable Pin respectively with the first end, the 1518th resistance (R1518) of the 1517th resistance (R1517)
The first end and the 1501st audion (Q1501) colelctor electrode be connected, the 1503rd transducer (U1503)
Power output end be connected with the first end of the 1516th electric capacity (C1516) and load respectively, the 1518th resistance
(R1518) control with processor respectively of the second end and the base stage of the 1501st audion (Q1501) enables
End be connected, the earth terminal of the 1503rd transducer (U1503), the second end of the 1514th electric capacity (C1514),
The emitter stage of the 1501st audion (Q1501) and the second end of the 1516th electric capacity (C1516) respectively with ground
It is connected.
Audio frequency input filter circuit the most according to claim 1, it is characterised in that also include the 601st
Transient Suppression Diode (V601) and the 602nd Transient Suppression Diode (V602), the 601st transient state suppression two
First end of pole pipe (V601) is connected with the first outfan of mike, the 602nd Transient Suppression Diode (V602)
The first end be connected with the second outfan of mike, the second of the 601st Transient Suppression Diode (V601)
Second end of end and the 602nd Transient Suppression Diode (V602) is connected to the ground respectively.
Audio frequency input filter circuit the most according to claim 2, it is characterised in that also include the 607th
Transient Suppression Diode (V607) and the 608th Transient Suppression Diode (V608), the 607th transient state suppression two
First end of pole pipe (V607) is connected with the first input end of speaker, the 608th Transient Suppression Diode (V608)
The first end be connected with the second input of speaker, the second of the 607th Transient Suppression Diode (V607)
Second end of end and the 608th Transient Suppression Diode (V608) is connected to the ground respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620271117.8U CN205491098U (en) | 2016-04-01 | 2016-04-01 | Audio input filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620271117.8U CN205491098U (en) | 2016-04-01 | 2016-04-01 | Audio input filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205491098U true CN205491098U (en) | 2016-08-17 |
Family
ID=56645559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620271117.8U Expired - Fee Related CN205491098U (en) | 2016-04-01 | 2016-04-01 | Audio input filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205491098U (en) |
-
2016
- 2016-04-01 CN CN201620271117.8U patent/CN205491098U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160817 Termination date: 20210401 |