CN206743523U - Audio signal detection switch circuit and audio frequency apparatus - Google Patents
Audio signal detection switch circuit and audio frequency apparatus Download PDFInfo
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- CN206743523U CN206743523U CN201720295180.XU CN201720295180U CN206743523U CN 206743523 U CN206743523 U CN 206743523U CN 201720295180 U CN201720295180 U CN 201720295180U CN 206743523 U CN206743523 U CN 206743523U
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Abstract
The utility model discloses a kind of audio signal detection switch circuit and audio frequency apparatus, and audio signal detection switch circuit includes one-level negative feedback amplifier circuit, and its multiple input connects one to one with multiple audio input ends；And when having detected audio signal input, exported after the audio signal is amplified into processing；Two level negative feedback amplifier circuit, its input are connected with the output end of one-level negative feedback amplifier circuit；And it will be exported after audio signal progress two level enhanced processing；Signaling conversion circuit, its input are connected with the output end of two level negative feedback amplifier circuit；And AC audio signal is converted into DC driven signal, and export；The output end connection of switched output circuits, its controlled end and signaling conversion circuit；And opened when detecting that DC driven signal is more than preset value, and low level detection signal is exported to master controller, to wake up audio frequency apparatus.When the utility model avoids the input of audio small-signal, because accuracy of detection is not enough and the problem of can not wake up system.
Description
Technical field
Audio frequency apparatus technical field is the utility model is related to, more particularly to a kind of audio signal detection switch circuit and audio
Equipment.
Background technology
With the popularization of the products such as portable audio, soundbar and MINI players, audio frequency apparatus increasingly becomes people
The necessity lived, basic information source of AUX (Auxiliary, the i.e. audio input interface) signals as audio product, for
It is developed into the emphasis of Audio Design.
Detect for AUX small-signals, usually carried out when audio frequency apparatus is standby, and mostly using the side of plug detection
Formula, specifically, the detection pin of the Master control chip of audio frequency apparatus are directly connected with AUX, if having detected, tone frequency channel wire inserts AUX
When, then it is determined with audio small-signal and inputs to audio frequency apparatus, and system is waken up, system is worked and carry out audio output, it is such a
The problem of being inputted using the easy generation of simple plug detection mode and non-audio signals and causing erroneous judgement.It is or small to audio
After signal is simply amplified rectification, export to master controller, so as to wake up system, the detection sensitivity of this detection mode
Not high and stability is poor, and can not obtain audio small-signal exactly, when causing to have the input of small-signal AUX signals, can not wake up
System, system is caused not work, it is also necessary to wake up system manually.
Utility model content
Main purpose of the present utility model is to propose a kind of audio signal detection switch circuit and audio frequency apparatus, it is intended to is avoided
When audio frequency apparatus sound intermediate frequency small-signal inputs, because accuracy of detection not enough and the problem of can not wake up audio frequency apparatus system occurs.
To achieve the above object, the utility model proposes a kind of audio signal detection switch circuit, applied to multiple
In the audio frequency apparatus of audio input end, the audio frequency apparatus includes master controller and standby power, and the audio signal detection is opened
Powered-down road includes：
One-level negative feedback amplifier circuit, there are multiple inputs, multiple inputs and multiple audio input ends
Connect one to one；The one-level negative feedback amplifier circuit is used to detect the multiple sound
When frequency input terminal has audio signal input, exported after the audio signal is amplified into processing；
Two level negative feedback amplifier circuit, its input are connected with the output end of the one-level negative feedback amplifier circuit；It is described
Two level negative feedback amplifier circuit is used to after the audio signal after the enhanced processing is carried out into two level enhanced processing export；
Signaling conversion circuit, its input are connected with the output end of the two level negative feedback amplifier circuit；The signal turns
Circuit is changed to be used to the AC audio signal after two level negative feedback amplifier circuit progress two level enhanced processing being converted into direct current
Drive signal, and export；
Switched output circuits, its controlled end are connected with the output end of the signaling conversion circuit；The switched output circuits
For being opened when detecting that the DC driven signal is more than preset value, and low level detection signal is exported to the master control
Device processed, to wake up audio frequency apparatus.
Preferably, the one-level negative feedback amplifier circuit includes the first one-level negative-feedback amplification module and the second one-level is negative anti-
Present amplification module, the input and multiple institutes of the first one-level negative-feedback amplification module and the second one-level negative-feedback amplification module
State audio input end to connect one to one, the output end and second one-level of the first one-level negative-feedback amplification module are negative anti-
Input of the output end of amplification module respectively with the two level negative feedback amplifier circuit is presented to be connected.
Preferably, the first one-level negative-feedback amplification module includes first resistor, second resistance, 3rd resistor, first
Electric capacity, the second electric capacity and the first triode, the first end of the first resistor is the first one-level negative-feedback amplification module
Input, the second end of the first resistor are connected with the first end of first electric capacity；Second end of first electric capacity with
The first end of the second resistance and the interconnection of the base stage of first triode；The colelctor electrode of first triode and described the
The first end interconnection at the second end of two resistance, the first end of second electric capacity and the 3rd resistor, first triode
Grounded emitter；Second end of the 3rd resistor is connected with the standby power；Second end of second electric capacity is institute
State the output end of the first one-level negative-feedback amplification module.
Preferably, the second one-level negative-feedback amplification module includes the 4th resistance, the 5th resistance, the 6th resistance, the 3rd
Electric capacity, the 4th electric capacity and the second triode, the first end of the 4th resistance is the second one-level negative-feedback amplification module
Input, the second end of the 4th resistance are connected with the first end of the 3rd electric capacity；Second end of the 3rd electric capacity with
The first end of 5th resistance and the base stage interconnection of second triode；The colelctor electrode of second triode and described the
The first end interconnection at the second end of five resistance, the first end of the 4th electric capacity and the 6th resistance, second triode
Grounded emitter；Second end of the 6th resistance is connected with the standby power；Second end of the 4th electric capacity is institute
State the output end of the second one-level negative-feedback amplification module.
Preferably, the two level negative feedback amplifier circuit includes the 7th resistance, the 8th resistance, the 5th electric capacity and the three or three pole
Pipe, the base stage of the 3rd triode are the input of the two level negative feedback amplifier circuit, and with the of the 7th resistance
One end connects；The colelctor electrode of 3rd triode and the second end of the 7th resistance, the 5th electric capacity first end and
The first end interconnection of 8th resistance, the grounded emitter of the 3rd triode；Second end of the 8th resistance and institute
State standby power connection；Second end of the 5th electric capacity is the output end of the second one-level negative-feedback amplification module.
Preferably, signaling conversion circuit includes the 6th electric capacity and double diode, and the common port of the double diode is described
The input of signaling conversion circuit；The plus earth of the double diode, the negative electrode of the double diode are changed for the signal
The output end of circuit is simultaneously connected with the first end of the 6th electric capacity；The second end ground connection of 6th electric capacity.
Preferably, the switched output circuits include the 9th resistance, the tenth resistance, the 11st resistance and switching tube, described
The first end of 9th resistance is the controlled end of the switched output circuits, the second end of the 9th resistance and the switching tube
The first end of controlled end and the tenth resistance interconnects；First actuating station of the switching tube and the first of the 11st resistance
End connection, the second actuating station of the switching tube and the second end of the tenth resistance are grounded；The of 11st resistance
Two ends are the output end of the switched output circuits.
Preferably, the switched output circuits also include the 7th electric capacity, the first end and the described tenth of the 7th electric capacity
The second end connection of one resistance, the second end ground connection of the 7th electric capacity.
Preferably, the audio signal detection switch circuit also includes pull-up resistor, the first end of the pull-up resistor with
The standby power connection, the second end of the pull-up resistor is connected with the output end of the switched output circuits.
The utility model also proposes a kind of audio frequency apparatus, and the audio frequency apparatus includes master controller, standby power and as above
Described audio signal detection switch circuit, the audio signal detection switch circuit is respectively with the master controller and described treating
Electromechanical source connects, and the audio signal detection switch circuit includes：The one-level negative feedback amplifier circuit, there are multiple inputs
End, multiple inputs connect one to one with multiple audio input ends；The one-level negative feedback amplifier circuit is used for
When detecting that the multiple audio input end has audio signal input, exported after the audio signal is amplified into processing；Institute
Two level negative feedback amplifier circuit is stated, its input is connected with the output end of the one-level negative feedback amplifier circuit；The two level is born
Feedback amplifier is used to after the audio signal after the enhanced processing is carried out into two level enhanced processing export；The signal conversion
Circuit, its input are connected with the output end of the two level negative feedback amplifier circuit；The signaling conversion circuit is used for by described in
AC audio signal after two level negative feedback amplifier circuit progress two level enhanced processing is converted into DC driven signal, and exports；
The switched output circuits, its controlled end are connected with the output end of the signaling conversion circuit；The switched output circuits are used for
Opened when receiving the DC driven signal, and export low level detection signal to the master controller, to wake up sound
Frequency equipment.
The utility model is put by using one-level negative feedback amplifier circuit and two level negative feedback amplifier circuit two-stage negative-feedback
Greatly, to reduce the multiplication factor of negative feedback amplifier circuits at different levels, so as to improve the stability of audio signal detection switch circuit.
Negative-feedback is introduced in negative feedback amplifier circuits at different levels simultaneously, to reduce the decline journey of the multiplication factor in low frequency range and high frequency region
Degree, so as to the passband of broadening audio signal, and then reduce audio signal due to nonlinear device in circuit be present, and cause defeated
Go out waveform and produce certain non-linear distortion.This ensure that the detection of audio small-signal can be complete well in each frequency range
Into the accuracy of detection of audio signal detection switch circuit and the sensitivity to audio small-signal being improved, so as to avoid audio
When equipment sound intermediate frequency small-signal inputs, because accuracy of detection is not enough and the problem of can not wake up audio frequency apparatus system.Pass through simultaneously
Switched output circuits are detecting that AC audio signal is converted into DC driven signal by signaling conversion circuit is more than preset value
Shi Kaiqi, and export the signal detection end of low level detection signal master controller into audio frequency apparatus, so as to avoid due to
It is poor to detect circuit stability, when non-audio signals input, the problem of false wake-up audio frequency apparatus system.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to the structure shown in these accompanying drawings.
Fig. 1 is the functional circuit schematic diagram that the utility model audio signal detection switch circuit is applied in audio frequency apparatus；
Fig. 2 is the electrical block diagram of the embodiment of Fig. 1 sound intermediate frequency signal detections on-off circuit one.
Drawing reference numeral explanation：
| Label | Title | Label | Title |
| 10 | One-level negative feedback amplifier circuit | R9 | 9th resistance |
| 20 | Two level negative feedback amplifier circuit | R10 | Tenth resistance |
| 30 | Signaling conversion circuit | R11 | 11st resistance |
| 40 | Switched output circuits | R12 | Pull-up resistor |
| 11 | First one-level negative-feedback amplification module | C1 | First electric capacity |
| 12 | Second one-level negative-feedback amplification module | C2 | Second electric capacity |
| R1 | First resistor | C3 | 3rd electric capacity |
| R2 | Second resistance | C4 | 4th electric capacity |
| R3 | 3rd resistor | C5 | 5th electric capacity |
| R4 | 4th resistance | D1 | Double diode |
| R5 | 5th resistance | Q1 | First triode |
| R6 | 6th resistance | Q2 | Second triode |
| R7 | 7th resistance | Q3 | 3rd triode |
| R8 | 8th resistance | Q4 | Switching tube |
| STB | Standby power |
Realization, functional characteristics and the advantage of the utility model purpose will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only part of the embodiment of the present utility model, rather than all
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, belong to the scope of the utility model protection.
If it is to be appreciated that related in the utility model embodiment directionality instruction (such as upper and lower, left and right, it is preceding,
Afterwards ...), then directionality instruction be only used for explain it is relative between each part under a certain particular pose (as shown in drawings)
Position relationship, motion conditions etc., if the particular pose changes, directionality instruction also correspondingly changes therewith.
If, should " first ", " the in addition, relate to the description of " first ", " second " etc. in the utility model embodiment
Two " etc. description is only used for describing purpose, and it is not intended that instruction or implying its relative importance or implicit indicating meaning
The quantity of the technical characteristic shown.Thus, " first " is defined, the feature of " second " can express or implicitly include at least one
Individual this feature.In addition, the technical scheme between each embodiment can be combined with each other, but must be with ordinary skill
Personnel can be implemented as basis, and this technical side is will be understood that when the combination appearance of technical scheme is conflicting or can not realize
The combination of case is not present, also not within the protection domain of the requires of the utility model.
The utility model proposes a kind of audio signal detection switch circuit, applied to the audio with multiple audio input ends
In equipment.The audio frequency apparatus includes master controller and standby power.
Reference picture 1 and Fig. 2, in the embodiment of the utility model one, the audio signal detection switch circuit includes：One-level
Negative feedback amplifier circuit 10, two level negative feedback amplifier circuit 20, signaling conversion circuit 30 and switched output circuits 40.
Specifically, one-level negative feedback amplifier circuit 10, there are multiple inputs, multiple inputs and multiple sounds
Frequency input terminal connects one to one；The one-level negative feedback amplifier circuit 10 is used to detect that the multiple audio input end has
When audio signal inputs, exported after the audio signal is amplified into processing；
Two level negative feedback amplifier circuit 20, the output end of its input and multiple one-level negative feedback amplifier circuits 10 connect
Connect；The two level negative feedback amplifier circuit 20 is used for will be defeated after the audio signal progress two level enhanced processing after the enhanced processing
Go out；
Signaling conversion circuit 30, its input are connected with the output end of the two level negative feedback amplifier circuit 20；The letter
The AC audio signal that number change-over circuit 30 is used to carrying out the two level negative feedback amplifier circuit 20 after two level enhanced processing turns
Change DC driven signal into, and export；
Switched output circuits 40, its controlled end are connected with the output end of the signaling conversion circuit 30；The switch output
Circuit 40 is used to open when detecting that the DC driven signal is more than preset value, and exports low level detection signal to institute
State the signal detection pin A-OUT of master controller (not shown).
In the present embodiment, one-level negative feedback amplifier circuit 10 is detecting that audio input end has audio signal input, especially
When being the input of audio small-signal, exported after the audio signal is carried out into one-level enhanced processing to two level negative feedback amplifier circuit 20,
So as to exported after two level negative feedback amplifier circuit 20 carries out two level enhanced processing to audio signal to signaling conversion circuit 30,
AC audio signal after carrying out two level enhanced processing is converted into exporting after DC driven signal to opening by signaling conversion circuit 30
Output circuit 40 is closed, is opened with driving switch output circuit 40 when detecting that the DC driven signal is more than preset value, and it is defeated
Go out the signal detection end of low level detection signal master controller into audio frequency apparatus, so as to wake up audio frequency apparatus system, and broadcast
Go out audio signal.
The utility model is negative anti-by using one-level negative feedback amplifier circuit 10 and the two-stage of two level negative feedback amplifier circuit 20
Feedback amplification, to reduce the multiplication factor of negative feedback amplifier circuits at different levels, so as to improve the steady of audio signal detection switch circuit
It is qualitative.Negative-feedback is introduced in negative feedback amplifier circuits at different levels simultaneously, to reduce the multiplication factor in low frequency range and high frequency region
Decline degree, so as to the passband of broadening audio signal, and then reduce audio signal due to nonlinear device in circuit be present, and
Output waveform is caused to produce certain non-linear distortion.This ensure that the detection of audio small-signal can be fine in each frequency range
Completion, the accuracy of detection of audio signal detection switch circuit and the sensitivity to audio small-signal are improved, so as to avoid
When audio frequency apparatus sound intermediate frequency small-signal inputs, because accuracy of detection is not enough and the problem of can not wake up audio frequency apparatus system.Simultaneously
Detecting that AC audio signal is converted into DC driven signal by signaling conversion circuit 30 is big by switched output circuits 40
Opened when preset value, and export the signal detection end of low level detection signal master controller into audio frequency apparatus, so as to keep away
Exempt from because detection circuit stability is poor, when non-audio signals input, the problem of false wake-up audio frequency apparatus system.
It is understood that the utility model audio signal detection switch circuit is only detecting that audio input end has sound
Frequency signal works when inputting, and is worked when being not detected by audio signal, to reduce the power consumption of circuit itself, realizes energy-saving ring
Protect.
In a preferred embodiment, it is negative anti-that the one-level negative feedback amplifier circuit 10 includes the first one-level by reference picture 1 and Fig. 2
Present the one-level negative-feedback amplification module 12 of amplification module 11 and second, the first one-level negative-feedback amplification module 11 and the second one-level
The input of negative-feedback amplification module 12 is connected one to one with multiple audio input ends, and the first one-level negative-feedback is put
The big output end of module 11 and the output end of the second one-level negative-feedback amplification module 12 are put with the two level negative-feedback respectively
The input connection of big circuit 20.It should be noted that usually, audio frequency apparatus at least two audio input ends, i.e., such as
A-IN1 and A-IN2 shown in accompanying drawing 2, for some multi-functional audio frequency apparatuses, quantity may be more.In the present embodiment,
In order to be adapted to the audio input end of audio frequency apparatus, the number of the audio input end of the corresponding audio frequency apparatus of one-level negative feedback amplifier circuit 10
Amount is provided with least two one-level negative-feedback amplification modules, i.e. the first one-level negative-feedback amplification module 11 and the second one-level negative-feedback
Amplification module 12.And for when detecting that corresponding audio signal input end has audio signal input, the audio signal to be entered
Exported after row enhanced processing.
With continued reference to Fig. 1 and Fig. 2, further, the first one-level negative-feedback amplification module 11 includes first resistor R1, second
Resistance R2,3rd resistor R3, the first electric capacity C1, the second electric capacity C2 and the first triode Q1, the first end of the first resistor R1
For the input of the first one-level negative-feedback amplification module 11, the second end of the first resistor R1 and the first electric capacity C1
First end connection；The second end of the first electric capacity C1 and the first end of the second resistance R2 and the first triode Q1
Base stage interconnection；The colelctor electrode of the first triode Q1 and the second end of the second resistance R2, the second electric capacity C2
First end and the interconnection of the first end of the 3rd resistor R3, the grounded emitter of the first triode Q1；The 3rd resistor
R3 the second end is connected with the standby power STB；The second end of the second electric capacity C2 is that the first one-level negative-feedback is put
The output end of big module 11.
In the present embodiment, first resistor R1 is used to match input impedance, in addition, by adjusting first resistor R1 resistance also
The distortion of audio signal can be reduced.First electric capacity C1 is used to filter out the flip-flop in audio signal.Second resistance R2 and
The feedback network of three resistance R3 compositions is used for the audio signal back of the output end of the first one-level negative-feedback amplification module 11 to defeated
Enter end, to reduce the multiplication factor of the first one-level negative-feedback amplification module 11, so as to stablize the output of audio signal.One or three pole
Pipe Q1 is operated in amplification region, and is turned on when there is audio signal input, so as to be exported after audio signal is amplified.Second electricity
Hold C2 to be used to the audio signal after amplification being coupled to two level negative feedback amplifier circuit 20.
With continued reference to Fig. 1 and Fig. 2, further, the at least two one-levels negative feedback amplifier circuit 10 the 2nd 1
Level negative-feedback amplification module 12 includes the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 3rd electric capacity C3, the 4th electric capacity C4
And second triode Q2, the 4th resistance R4 first end be the second one-level negative-feedback amplification module 12 input,
The second end of the 4th resistance R4 is connected with the first end of the 3rd electric capacity C3；The second end of the 3rd electric capacity C3 and institute
State the 5th resistance R5 first end and the base stage interconnection of the second triode Q2；The colelctor electrode of the second triode Q2 and institute
The first end interconnection at the 5th resistance R5 the second end, the first end of the 4th electric capacity C4 and the 6th resistance R6 is stated, it is described
Second triode Q2 grounded emitter；The second end of the 6th resistance R6 is connected with the standby power STB；Described 4th
Electric capacity C4 the second end is the output end of the second one-level negative-feedback amplification module 12.
In the present embodiment, the 4th resistance R4 is used to match input impedance, in addition, by adjusting the 4th resistance R4 resistance also
The distortion of audio signal can be reduced.3rd electric capacity C3 is used to filter out the flip-flop in audio signal.5th resistance R5 and
The feedback network of six resistance R6 compositions is used for the audio signal back of the output end of the second one-level negative-feedback amplification module 12 to defeated
Enter end, to reduce the multiplication factor of the second one-level negative-feedback amplification module 12, so as to stablize the output of audio signal.Two or three pole
Pipe Q2 is operated in amplification region, and is turned on when there is audio signal input, so as to be exported after audio signal is amplified.4th electricity
Hold C4 to be used to the audio signal after amplification being coupled to two level negative feedback amplifier circuit 20.
Reference picture 1 and Fig. 2, in a preferred embodiment, the two level negative feedback amplifier circuit 20 include the 7th resistance R7,
8th resistance R8, the 5th electric capacity C5 and the 3rd triode Q3, the base stage of the 3rd triode Q3 are put for the two level negative-feedback
The input of big circuit 20, and be connected with the first end of the 7th resistance R7；The colelctor electrode of the 3rd triode Q3 and institute
The first end interconnection at the 7th resistance R7 the second end, the first end of the 5th electric capacity C5 and the 8th resistance R8 is stated, it is described
3rd triode Q3 grounded emitter；The second end of the 8th resistance R8 is connected with the standby power STB；Described 5th
Electric capacity C5 the second end is the output end of the second one-level negative-feedback amplification module 12.
In the present embodiment, the feedback network of the 7th resistance R7 and the 8th resistance R8 compositions is used to two level negative-feedback amplifying electricity
The audio signal back of the output end of road 20 is to input, to reduce the multiplication factor of two level negative feedback amplifier circuit 20, so as to steady
The output of audio signal.3rd triode Q3 is operated in amplification region, and is turned on when there is audio signal input, so as to by audio
Signal exports after being amplified.5th electric capacity C5 is used to the audio signal after amplification being coupled to switched output circuits 40.
It is understood that in other embodiments, audio signal detection switch circuit can also be put in two level negative-feedback
Big circuit 20 sets up one or more levels negative feedback amplifier circuit below, to improve the stability of audio signal detection switch circuit,
It is not limited herein.
Reference picture 1 and Fig. 2, in a preferred embodiment, signaling conversion circuit 30 include the 6th electric capacity C6 and double diode
D1, the 6th electric capacity C6 first end be the signaling conversion circuit 30 input, the second end of the 6th resistance R6
It is connected with the common port of the double diode D1；The plus earth of the double diode D1, the negative electrode of the double diode D1 are
The output end of the signaling conversion circuit 30.
In the present embodiment, in the present embodiment, the 6th electric capacity C6 is used to filter out the clutter in audio signal, and then stable DC
The output of drive signal, while it is additionally operable to balance the output of DC driven signal.6th electric capacity C6 and double diode D1 compositions
Halfwave rectifier filter circuit, the audio signal of exchange is converted into DC driven signal and exported.
Reference picture 1 and Fig. 2, in a preferred embodiment, the switched output circuits 40 include the 9th resistance R9, the tenth electricity
Hinder R10, the 11st resistance R11 and switching tube Q4, the 9th resistance R9 first end for the switched output circuits 40 by
End is controlled, the second end of the 9th resistance R9 and the first end of the controlled end of the switching tube Q4 and the tenth resistance R10 are mutual
Even；The first actuating station of the switching tube Q4 is connected with the first end of the 11st resistance R11, and the second of the switching tube Q4
Actuating station and the second end of the tenth resistance R10 are grounded；The second end of the 11st resistance R11 exports for the switch
The output end of circuit 40.
In the present embodiment, switching tube Q4 can be the electronic switches such as triode, metal-oxide-semiconductor, and the present embodiment preferably uses three poles
Pipe, the 9th resistance R9 and the tenth resistance R10 are used to connecting partial pressure to realize DC driven signal output to switching tube Q4, according to point
Principle is pressed, the 9th resistance R9 and the tenth resistance R10 ratio is bigger, and the voltage got on the 9th resistance R9 is also bigger.This
Sample, it is possible to by adjusting the 9th resistance R9 and/or the tenth resistance R10 resistance the switching tube Q4 conduction value that adjusts, with
Low level detection signal output is adjusted, and then adjusts sensitivity of the audio signal detection switch circuit to audio small-signal.
Further, the switched output circuits 40 also include the 7th electric capacity C7, the first end of the 7th electric capacity C7 with
The second end connection of the 11st resistance R11, the second end ground connection of the 7th electric capacity C7.
In the present embodiment, the 7th electric capacity C7 is used for when switching tube Q4 is turned on, and enters through the 11st resistance R11 and switching tube Q4
Row electric discharge, and when switching cut-off, charged, continue to output low level detection signal, to extend the output of detection signal
Time.
Reference picture 2, based on above-described embodiment, the audio signal detection switch circuit still further comprises pull-up resistor
R12, the first end of the pull-up resistor R12 are connected with the standby power STB, the second end of the pull-up resistor R12 and institute
State the output end connection of switched output circuits 40.
In the present embodiment, it is defeated without low level detection signal in switched output circuits 40 that pull-up resistor R12 is used for realization
When going out, the input for keeping the signal detection pin A-OUT of the master controller of audio frequency apparatus is high level, to avoid master controller false touch
Send out and wake up system.
The utility model also proposes a kind of audio frequency apparatus.
Audio frequency apparatus described in the audio frequency apparatus includes master controller, standby power and audio signal as described above detection and opened
Powered-down road, the audio signal detection switch circuit are connected with the master controller and the standby power respectively.The audio is believed
The concrete structure of number detection switch circuit is opened with reference to above-described embodiment because this audio frequency apparatus employs above-mentioned audio signal detection
Whole technical schemes of all embodiments on powered-down road, therefore at least with above-mentioned audio signal detection switch circuit embodiments
All beneficial effects caused by technical scheme, this is no longer going to repeat them.
In the present embodiment, audio frequency apparatus can be portable player, soundbar, mini player, BT speaker
(Bluetooth audio device) and wireless speaker (wireless sound box) etc. have the audio frequency apparatus of AUX information sources.
Preferred embodiment of the present utility model is the foregoing is only, not thereby limits the scope of the claims of the present utility model,
Every equivalent structure change under inventive concept of the present utility model, made using the utility model specification and accompanying drawing content
Change, or directly/be used in other related technical areas indirectly and be included in scope of patent protection of the present utility model.
Claims (10)
1. a kind of audio signal detection switch circuit, applied in the audio frequency apparatus with multiple audio input ends, the audio
Equipment includes master controller and standby power, it is characterised in that the audio signal detection switch circuit includes：
One-level negative feedback amplifier circuit, there are multiple inputs, multiple inputs and multiple audio input ends are one by one
Corresponding connection；The one-level negative feedback amplifier circuit is used to detect that the multiple audio input end has audio signal input
When, exported after the audio signal is amplified into processing；
Two level negative feedback amplifier circuit, its input are connected with the output end of the one-level negative feedback amplifier circuit；The two level
Negative feedback amplifier circuit is used to after the audio signal after the enhanced processing is carried out into two level enhanced processing export；
The signaling conversion circuit, its input are connected with the output end of the two level negative feedback amplifier circuit；The signal turns
Circuit is changed to be used to the AC audio signal after two level negative feedback amplifier circuit progress two level enhanced processing being converted into direct current
Drive signal, and export；
The switched output circuits, its controlled end are connected with the output end of the signaling conversion circuit；The switched output circuits
For being opened when receiving the DC driven signal, and low level detection signal is exported to the master controller, to call out
Awake audio frequency apparatus.
2. audio signal detection switch circuit as claimed in claim 1, it is characterised in that the one-level negative feedback amplifier circuit
Including the first one-level negative-feedback amplification module and the second one-level negative-feedback amplification module, the first one-level negative-feedback amplification module
And second one-level negative-feedback amplification module input it is corresponding with the quantity of the audio input end, the first one-level negative-feedback
The output end of amplification module and the output end of the second one-level negative-feedback amplification module are amplified with the two level negative-feedback respectively
The input connection of circuit.
3. audio signal detection switch circuit as claimed in claim 2, it is characterised in that the first one-level negative-feedback amplification
Module includes first resistor, second resistance, 3rd resistor, the first electric capacity, the second electric capacity and the first triode, the first resistor
First end be the first one-level negative-feedback amplification module input, the second end of the first resistor with described first electricity
The first end connection of appearance；Second end of first electric capacity and the first end of the second resistance and the base of first triode
Pole interconnects；The colelctor electrode of first triode and the second end of the second resistance, the first end of second electric capacity and institute
State the first end interconnection of 3rd resistor, the grounded emitter of first triode；Second end of the 3rd resistor with it is described
Standby power connects；Second end of second electric capacity is the output end of the first one-level negative-feedback amplification module.
4. audio signal detection switch circuit as claimed in claim 2, it is characterised in that the second one-level negative-feedback amplification
Module includes the 4th resistance, the 5th resistance, the 6th resistance, the 3rd electric capacity, the 4th electric capacity and the second triode, the 4th resistance
First end be the second one-level negative-feedback amplification module input, the second end of the 4th resistance with the described 3rd electricity
The first end connection of appearance；Second end of the 3rd electric capacity and the first end of the 5th resistance and the base of second triode
Pole interconnects；The colelctor electrode of second triode and the second end of the 5th resistance, the first end of the 4th electric capacity and institute
State the first end interconnection of the 6th resistance, the grounded emitter of second triode；Second end of the 6th resistance with it is described
Standby power connects；Second end of the 4th electric capacity is the output end of the second one-level negative-feedback amplification module.
5. audio signal detection switch circuit as claimed in claim 1, it is characterised in that the two level negative feedback amplifier circuit
Including the 7th resistance, the 8th resistance, the 5th electric capacity and the 3rd triode, the base stage of the 3rd triode is negative anti-for the two level
The input of amplifying circuit is presented, and is connected with the first end of the 7th resistance；The colelctor electrode of 3rd triode with it is described
The first end interconnection at the second end of the 7th resistance, the first end of the 5th electric capacity and the 8th resistance, the three or three pole
The grounded emitter of pipe；Second end of the 8th resistance is connected with the standby power；Second end of the 5th electric capacity is
The output end of the two level negative-feedback amplification module.
6. audio signal detection switch circuit as claimed in claim 1, it is characterised in that signaling conversion circuit includes the 6th electricity
Hold and diode, the common port of the diode are the input of the signaling conversion circuit；The reverse input of the diode
End ground connection, the positive output end of the diode for the signaling conversion circuit output end and with the first of the 6th electric capacity
End connection；The second end ground connection of 6th electric capacity.
7. audio signal detection switch circuit as claimed in claim 1, it is characterised in that the switched output circuits include the
Nine resistance, the tenth resistance, the 11st resistance and switching tube, the first end of the 9th resistance is the switched output circuits
Controlled end, the second end of the 9th resistance interconnect with the first end of the controlled end of the switching tube and the tenth resistance；Institute
The first actuating station for stating switching tube is connected with the first end of the 11st resistance, the second actuating station of the switching tube with it is described
Second end of the tenth resistance is grounded；Second end of the 11st resistance is the output end of the switched output circuits.
8. audio signal detection switch circuit as claimed in claim 7, it is characterised in that the switched output circuits also include
7th electric capacity, the first end of the 7th electric capacity are connected with the second end of the 11st resistance, and the second of the 7th electric capacity
End ground connection.
9. the audio signal detection switch circuit as described in claim 1 to 8 any one, it is characterised in that the audio letter
Number detection switch circuit also includes pull-up resistor, and the first end of the pull-up resistor is connected with the standby power, the pull-up
Second end of resistance is connected with the output end of the switched output circuits.
10. a kind of audio frequency apparatus, it is characterised in that the audio frequency apparatus includes master controller, standby power and such as claim 1
To the audio signal detection switch circuit described in 9 any one, the audio signal detection switch circuit is respectively at the master control
Device processed and standby power connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720295180.XU CN206743523U (en) | 2017-03-23 | 2017-03-23 | Audio signal detection switch circuit and audio frequency apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720295180.XU CN206743523U (en) | 2017-03-23 | 2017-03-23 | Audio signal detection switch circuit and audio frequency apparatus |
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| CN206743523U true CN206743523U (en) | 2017-12-12 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109511040A (en) * | 2018-12-27 | 2019-03-22 | 歌尔科技有限公司 | A kind of whisper in sb.'s ear amplification method, device and earphone |
| CN111953325A (en) * | 2020-08-16 | 2020-11-17 | 西安电子科技大学 | Audio signal detection circuit using window comparator |
| CN113295956A (en) * | 2021-06-04 | 2021-08-24 | 广州朗国电子科技有限公司 | DP signal source detection circuit, DP signal source detection method and display device |
-
2017
- 2017-03-23 CN CN201720295180.XU patent/CN206743523U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109511040A (en) * | 2018-12-27 | 2019-03-22 | 歌尔科技有限公司 | A kind of whisper in sb.'s ear amplification method, device and earphone |
| CN111953325A (en) * | 2020-08-16 | 2020-11-17 | 西安电子科技大学 | Audio signal detection circuit using window comparator |
| CN111953325B (en) * | 2020-08-16 | 2022-03-18 | 西安电子科技大学 | Audio signal detection circuit using window comparator |
| CN113295956A (en) * | 2021-06-04 | 2021-08-24 | 广州朗国电子科技有限公司 | DP signal source detection circuit, DP signal source detection method and display device |
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