CN209089217U - Noise elimination circuit and power amplifier audio system - Google Patents
Noise elimination circuit and power amplifier audio system Download PDFInfo
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- CN209089217U CN209089217U CN201821748737.1U CN201821748737U CN209089217U CN 209089217 U CN209089217 U CN 209089217U CN 201821748737 U CN201821748737 U CN 201821748737U CN 209089217 U CN209089217 U CN 209089217U
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Abstract
A kind of noise elimination circuit power amplifier audio system includes that control unit, noise eliminate unit and power amplifier unit.The noise elimination circuit and power amplifier audio system of the utility model eliminate unit and power amplifier unit by setting control unit, noise.In actual application process, when needing to eliminate noise, control unit is toward first input end or the one of input terminal input high level signal of the second input terminal or third input terminal, at this time, regardless of the 4th input terminal input high level signal or low level signal, first switch tube Q1 can be connected, at this time, the mute control terminal of power amplifier unit is directly grounded, drag down the level of the mute control terminal of power amplifier unit, realize the elimination of noise, that is, muting function, so that the sound quality that power amplifier audio system plays back is good, the setting that noise eliminates unit can optimize voice signal, improve user's auditory perception, promote the experience effect of user.
Description
Technical field
The utility model relates to mute technology for eliminating fields, more particularly to a kind of noise elimination circuit and power amplifier audio system
System.
Background technique
Power amplification circuit is a kind of amplifying circuit for the purpose of exporting relatively high power.It generally directly drives load,
Load capacity is eager to excel.Output stage of the power amplification circuit usually as multistage amplifier circuit.In many electronic equipments, it is desirable that put
The output stage of big circuit is able to drive certain load, such as driving instrument, makes throw of pointer；Drive the speaker is allowed to sounding；Or
Drive the executing agency etc. in automatic control system.In a word, it is desirable that amplifying circuit has sufficiently large output power.Such amplification
Circuit is referred to as power amplification circuit.
Power amplification circuit is widely used in various fields, for example, field of LED illumination because of its plurality of advantages；Again
Such as, audio area.For with audio area, particularly, for onboard audio field, since vehicle-mounted energy resource supply is limited,
Therefore, in order to promote the result of broadcast of vehicle-mounted playing device, it will usually in playing device built-in power amplifying circuit, so as to play
Device signal can also export greatly in the case where small signal inputs, and reduce vehicle-mounted energy consumption as far as possible, guarantee vehicle-mounted energy
The sustainable supply in source.For existing vehicle-mounted audio frequency circuit, noise will not be usually set inside it and eliminate unit, caused now
Vehicle-mounted audio frequency circuit, the voice signal that playing device plays back adulterates certain noise signals, if playing device is in sound
It measures in lesser situation, user, which does not have, is notably perceived that noise signals, but the situation larger in playing device volume
Under, what user will be perfectly clear feels noise signals, seriously affects the auditory perception of user, causes user experience bad.
Utility model content
The purpose of the utility model is to overcome shortcomings in the prior art, and noise signals can be eliminated by providing one kind
, optimization vehicle-mounted playing device plays sound, improves the noise elimination circuit and power amplifier audio system of user's auditory perception.
The purpose of this utility model is achieved through the following technical solutions:
A kind of noise elimination circuit, comprising:
Control unit；
Noise eliminates unit, and it includes first diode D1, the second diode D2, third diode that the noise, which eliminates unit,
D3, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, first switch tube Q1, the 6th electricity
Resistance R6, first capacitor C1, the 7th resistance R7 and the 8th resistance R8, the anode of the first diode D1 are eliminated as the noise
The first input end of unit and the first control output end of described control unit connect, and the second diode D2 is as described miscellaneous
Sound eliminates the second input terminal of unit and the second control output end of described control unit connects, the yin of the third diode D3
The third input terminal of unit and the third control output end connection of described control unit, the third are eliminated as the noise in pole
The anode of diode D3 respectively with the anode of the first diode D1, the second diode D2 anode, it is described 4th electricity
One end of resistance R4 is connected with one end of the 5th resistance R5, the other end and the first switch tube Q1 of the 4th resistance R4
Base stage connection, the other end ground connection of the 5th resistance R5, one end of the first resistor R1 is eliminated single as the noise
4th input terminal of member and the 4th control output end of described control unit connect, the other end ground connection of the first resistor R1,
One end of the second resistance R2 is connect with the first external power supply Vcc, and the other end of the second resistance R2 is respectively with described one
The other end of resistance R1 is connected with one end of the 3rd resistor R3, and the other end of the 3rd resistor R3 is respectively with described first
The collector of switching tube Q1 is connected with one end of the 6th resistance R6, and the other end of the 6th resistance R6 is as the noise
Eliminate the output end of unit, the first switch tube Q1 emitter ground connection, one end of the first capacitor C1 and the 6th electricity
The other end connection of R6 is hindered, the other end ground connection of the first capacitor C1, the 7th resistance R7 and the first capacitor C1 are simultaneously
Connection connection, one end of the 8th resistance R8 are connect with one end of the 7th resistance R7, the other end of the 8th resistance R8
It is connect with the second external power supply Power_B；And
The mute control terminal of power amplifier unit, the power amplifier unit is connect with the output end that the noise eliminates unit.
In a wherein embodiment, the resistance value of the 3rd resistor R3 is equal to 10K Ω.
In a wherein embodiment, the resistance value of the 4th resistance R4 is equal to 10K Ω.
In a wherein embodiment, the first switch tube Q1 is NPN triode.
In a wherein embodiment, the capacitance size of the first capacitor C1 is equal to 1uF.
In a wherein embodiment, the resistance value of the 6th resistance R6 is equal to 1K Ω.
In a wherein embodiment, the resistance value of the 7th resistance R7 is equal to 47K Ω.
In a wherein embodiment, the resistance value of the 8th resistance R8 is equal to 100K Ω.
A kind of power amplifier audio system, including noise elimination circuit described above.
The utility model compared with the prior art the advantages of and have the beneficial effect that:
The noise elimination circuit and power amplifier audio system of the utility model eliminate unit by setting control unit, noise
And power amplifier unit.In actual application process, when needing to eliminate noise, control unit toward first input end or
Second input terminal or the one of input terminal input high level signal of third input terminal, at this point, regardless of the 4th input terminal inputs
High level signal or low level signal, first switch tube Q1 can be connected, at this point, the mute control terminal of power amplifier unit directly connects
Ground drags down the level of the mute control terminal of power amplifier unit, realizes the elimination of noise, that is, muting function, so that power amplifier audio system
The sound quality played back of uniting is good, and the setting that noise eliminates unit can optimize voice signal, improves user's auditory perception, mentions
Rise the experience effect of user.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is the circuit diagram of the noise elimination circuit in an embodiment of the utility model.
Specific embodiment
The utility model is more fully retouched below with reference to relevant drawings for the ease of understanding the utility model,
It states.The better embodiment of the utility model is given in attached drawing.But the utility model can come in many different forms
It realizes, however it is not limited to embodiments described herein.On the contrary, the purpose of providing these embodiments is that making practical new to this
The disclosure of type understands more thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the utility model
The normally understood meaning of the technical staff in domain is identical.Terminology used in the description of the utility model herein only be
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term " and or " used herein packet
Include any and all combinations of one or more related listed items.
Referring to Fig. 1, power amplifier audio system includes noise elimination circuit 10, noise elimination circuit 10 include control unit,
Noise eliminates unit and power amplifier unit；It includes first diode D1, the second diode D2, third diode that noise, which eliminates unit,
D3, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, first switch tube Q1, the 6th electricity
Hinder the of the anode of R6, first capacitor C1, the 7th resistance R7 and the 8th resistance R8, first diode D1 as noise elimination unit
The connection of first control output end of one input terminal and control unit, the second diode D2 eliminate the second input of unit as noise
End is connect with the second control output end of control unit, and the cathode of third diode D3 eliminates the third input of unit as noise
End connect with the third control output end of control unit, the anode of third diode D3 respectively with the anode of first diode D1,
The anode of second diode D2, one end of the 4th resistance R4 are connected with one end of the 5th resistance R5, the other end of the 4th resistance R4
It is connect with the base stage of first switch tube Q1, the other end ground connection of the 5th resistance R5, one end of first resistor R1 is eliminated as noise
4th input terminal of unit and the 4th control output end of control unit connect, the other end ground connection of first resistor R1, the second electricity
One end of resistance R2 is connect with the first external power supply Vcc, the other end of second resistance R2 respectively with the other end of a resistance R1 and the
One end of three resistance R3 connects, the other end of 3rd resistor R3 respectively with the collector of first switch tube Q1 and the 6th resistance R6
One end connection, the other end of the 6th resistance R6 eliminate the output end of unit as noise, and first switch tube Q1 emitter is grounded, the
One end of one capacitor C1 is connect with the other end of the 6th resistance R6, the other end of first capacitor C1 ground connection, the 7th resistance R7 and the
One capacitor C1 is connected in parallel, and one end of the 8th resistance R8 is connect with one end of the 7th resistance R7, the other end of the 8th resistance R8 with
Second external power supply Power_B connection；And the mute control terminal of power amplifier unit is connect with the output end that noise eliminates unit.
In this way, in actual application process, when needing to eliminate noise, control unit toward first input end or
The second input terminal of person or the one of input terminal input high level signal of third input terminal, at this point, regardless of the 4th input terminal is defeated
Enter high level signal or low level signal, first switch tube Q1 can be connected, at this point, the mute control terminal of power amplifier unit is direct
Ground connection, drags down the level of the mute control terminal of power amplifier unit, realizes the elimination of noise, that is, muting function, so that power amplifier audio
The sound quality that system plays come out is good, and the setting that noise eliminates unit can optimize voice signal, improves user's auditory perception,
Promote the experience effect of user.
It should be noted that control unit is common MCU unit, that is, central processing unit plays control and management
Effect, the working principle of control unit no longer elaborates, is well known to those skilled in the art；Power amplifier unit is
TDA7388 power amplifier chips are provided with mute control terminal on TDA7388 power amplifier chips, and working principle no longer elaborates, for this
Known to the technical staff of field.
It should also be noted that, first diode D1, the second diode D2 and third diode D3 play the role of isolation,
When wherein some input terminal is high level signal, for example, first input end is high level signal, due to the second diode D2
With the one-way conduction of third diode D3, the level signal of first input end does not interfere with three of corresponding control unit
Control output end.
Further, referring to Fig. 1, in one embodiment, the resistance value of the 3rd resistor R3 is equal to 10K Ω.
In this way, 3rd resistor R3 plays the role of weakening voice signal, excessive two damage of the voice signal inputted to power amplifier unit is prevented
Bad power amplifier unit.
Further, referring to Fig. 1, in one embodiment, the resistance value of the 4th resistance R4 is equal to 10K Ω.
In this way, the 4th resistance R4 plays the role of protecting first switch tube Q1.
Further, referring to Fig. 1, in one embodiment, the first switch tube Q1 is NPN triode.
Further, referring to Fig. 1, in one embodiment, the capacitance size of the first capacitor C1 is equal to
1uF.In this way, first capacitor C1 plays the role of filtering, separated by direct communication, filtering clutter.
Further, referring to Fig. 1, in one embodiment, the resistance value of the 6th resistance R6 is equal to 1K Ω.Such as
This, the 6th resistance R6 plays the role of protecting the mute control terminal of power amplifier unit.
Further, referring to Fig. 1, in one embodiment, the resistance value of the 7th resistance R7 is equal to 47K Ω.
In this way, the 7th resistance R7 plays the role of partial pressure, improve voice signal.
Further, referring to Fig. 1, in one embodiment, the resistance value of the 8th resistance R8 is equal to 100K Ω.
In this way, the 8th resistance R8 also functions to the effect of partial pressure, improve voice signal.
The noise elimination circuit and power amplifier audio system of the utility model eliminate unit by setting control unit, noise
And power amplifier unit.In actual application process, when needing to eliminate noise, control unit toward first input end or
Second input terminal or the one of input terminal input high level signal of third input terminal, at this point, regardless of the 4th input terminal inputs
High level signal or low level signal, first switch tube Q1 can be connected, at this point, the mute control terminal of power amplifier unit directly connects
Ground drags down the level of the mute control terminal of power amplifier unit, realizes the elimination of noise, that is, muting function, so that power amplifier audio system
The sound quality played back of uniting is good, and the setting that noise eliminates unit can optimize voice signal, improves user's auditory perception, mentions
Rise the experience effect of user.
Embodiment described above only expresses the several embodiments of the utility model, and description is more specific and detailed
Carefully, but it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the general of this field
For logical technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these are all
Belong to the protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (9)
1. a kind of noise elimination circuit characterized by comprising
Control unit；
Noise eliminates unit, the noise eliminate unit include first diode D1, the second diode D2, third diode D3,
First resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, first switch tube Q1, the 6th resistance
R6, first capacitor C1, the 7th resistance R7 and the 8th resistance R8, the anode of the first diode D1 are eliminated single as the noise
The first input end of member and the first control output end of described control unit connect, and the second diode D2 is as the noise
Second control output end of the second input terminal and described control unit of eliminating unit connects, the cathode of the third diode D3
It is connected as the third input terminal of noise elimination unit and the third control output end of described control unit, the described 3rd 2
The anode of pole pipe D3 respectively with the anode of the first diode D1, the anode of the second diode D2, the 4th resistance
One end of R4 is connected with one end of the 5th resistance R5, and the other end of the 4th resistance R4 is with the first switch tube Q1's
Base stage connection, the other end ground connection of the 5th resistance R5, unit is eliminated as the noise in one end of the first resistor R1
The 4th input terminal and the 4th control output end of described control unit connect, the other end of first resistor R1 ground connection, institute
The one end for stating second resistance R2 is connect with the first external power supply Vcc, and the other end of the second resistance R2 is electric with described one respectively
The other end of resistance R1 is connected with one end of the 3rd resistor R3, and the other end of the 3rd resistor R3 is opened with described first respectively
The collector for closing pipe Q1 is connected with one end of the 6th resistance R6, and the other end of the 6th resistance R6 disappears as the noise
Except the output end of unit, the first switch tube Q1 emitter is grounded, one end of the first capacitor C1 and the 6th resistance
The other end of R6 connects, the other end ground connection of the first capacitor C1, and the 7th resistance R7 is in parallel with the first capacitor C1
Connection, one end of the 8th resistance R8 connect with one end of the 7th resistance R7, the other end of the 8th resistance R8 and
Second external power supply Power_B connection；And
The mute control terminal of power amplifier unit, the power amplifier unit is connect with the output end that the noise eliminates unit.
2. noise elimination circuit according to claim 1, which is characterized in that the resistance value of the 3rd resistor R3 is equal to 10K
Ω。
3. noise elimination circuit according to claim 1, which is characterized in that the resistance value of the 4th resistance R4 is equal to 10K
Ω。
4. noise elimination circuit according to claim 1, which is characterized in that the first switch tube Q1 is NPN triode.
5. noise elimination circuit according to claim 1, which is characterized in that the capacitance size of the first capacitor C1 is equal to
1uF。
6. noise elimination circuit according to claim 1, which is characterized in that the resistance value of the 6th resistance R6 is equal to 1K
Ω。
7. noise elimination circuit according to claim 1, which is characterized in that the resistance value of the 7th resistance R7 is equal to 47K
Ω。
8. noise elimination circuit according to claim 1, which is characterized in that the resistance value of the 8th resistance R8 is equal to 100K
Ω。
9. a kind of power amplifier audio system, which is characterized in that eliminate electricity including noise described in any one of claim 1-8
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821748737.1U CN209089217U (en) | 2018-10-26 | 2018-10-26 | Noise elimination circuit and power amplifier audio system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821748737.1U CN209089217U (en) | 2018-10-26 | 2018-10-26 | Noise elimination circuit and power amplifier audio system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209089217U true CN209089217U (en) | 2019-07-09 |
Family
ID=67120998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821748737.1U Active CN209089217U (en) | 2018-10-26 | 2018-10-26 | Noise elimination circuit and power amplifier audio system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209089217U (en) |
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2018
- 2018-10-26 CN CN201821748737.1U patent/CN209089217U/en active Active
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