CN105067944B - A kind of detection circuit and detection method for COBBAIF - Google Patents
A kind of detection circuit and detection method for COBBAIF Download PDFInfo
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Abstract
The present invention relates to electronic circuit technology field, more particularly to a kind of detection circuit and detection method for COBBAIF.Detection circuit of the present invention includes audio terminal, tone frequency channel wire insertion detection module, bias voltage module, resistance R1, electric capacity C1, resistance R2 and MCU；The present invention is when tone frequency channel wire insertion detection module has detected tone frequency channel wire and has been inserted into audio terminal, MCU control bias voltage module conductings, tone frequency channel wire other end vacantly with not hanging two states, resistance between bias voltage module and ground it is of different sizes, can determine whether out whether tone frequency channel wire other end hanging accordingly；MCU makes further control according to the whether hanging judged result of tone frequency channel wire other end, when tone frequency channel wire other end is hanging, the signal of MCU shielding tone frequency channel wire transmission, avoids tone frequency channel wire that interference signal is incorporated into system with this.
Description
Technical field
The present invention relates to electronic circuit technology field, more particularly to it is a kind of for the detection circuit of COBBAIF and detection side
Method.
Background technology
Audio terminal is commonly used as in Line in input access audio interface circuits, and its structural representation is as shown in Figure 1.
Current audio interface circuit, can much detect the presence of tone frequency channel wire and be inserted into audio terminal, its principle is：Inserted when without tone frequency channel wire
When entering to audio terminal, the 4th pin of audio terminal and the 5th pin are in connection status, the 6th pin of audio terminal and the 7th
Pin is in connection status；When there is tone frequency channel wire to be inserted into audio terminal, sound is withstood on the tone frequency channel wire head in insertion audio terminal
The 5th pin and the 7th pin of frequency terminal, can using this change to being disconnected respectively with the 4th pin of audio terminal and the 6th pin
It is inserted into detecting the presence of tone frequency channel wire in audio terminal.
But, current audio interface circuit can only accomplish that detecting the presence of tone frequency channel wire is inserted into audio terminal, it is impossible to enter one
Whether the other end of step detection tone frequency channel wire is hanging.And the situation of physical presence is, when COBBAIF is accessed in one end of tone frequency channel wire
When circuit, other end are hanging, tone frequency channel wire can be introduced noise into audio interface circuit, to audio interface circuit or and sound
The system of frequency interface circuit connection brings various interference.For example, as tone frequency channel wire one end by audio interface circuit access audio amplifier,
When the other end is hanging, audio amplifier can send drone noise.
The content of the invention
In consideration of it, the present invention proposes a kind of detection circuit and detection method for COBBAIF, the detection electricity is utilized
Road, can detect whether the other end of tone frequency channel wire is hanging, thus testing result system can make corresponding counter-measure, so as to keep away
Exempt from the system that interference signal is introduced to audio interface circuit or is connected with audio interface circuit by the other end of tone frequency channel wire.
Technical solution of the present invention：
A kind of detection circuit for COBBAIF, including：Audio terminal, tone frequency channel wire insertion detection module, bias voltage
Module, resistance R1, electric capacity C1, resistance R2 and MCU, the detection pin connection tone frequency channel wire of audio terminal insert the detection of detection module
Input, the detection output connection MCU of tone frequency channel wire insertion detection module, the L channel pin or R channel pipe of audio terminal
Pin connection resistance R1 one end, the resistance R1 other end and the controlled end of bias voltage module, resistance R2 one end, electric capacity C1
One end is connected, resistance R2 other end ground connection, electric capacity C1 other end connection MCU, the control end connection of bias voltage module
MCU。
Further, tone frequency channel wire insertion detection module includes resistance R7 and power supply VCC, resistance R7 one end connection power supply
The detection input and tone frequency channel wire that VCC, resistance the R7 other end insert detection module respectively as tone frequency channel wire insert detection module
Detection output.
Further, biasing module includes resistance R6, resistance R5, triode Q1 and power supply VCC, and resistance R5 one end is connected
Power supply VCC, resistance the R5 other end connecting triode Q1 colelctor electrode, triode Q1 base stage connection resistance R6 one end, electricity
The R6 other end is hindered as the control end of bias voltage module, and triode Q1 emitter stage connects the controlled of bias voltage module
End.
Further, in addition to analog-digital converter ADC1 and analog-digital converter ADC2, analog-digital converter ADC1 is in electric capacity C1
Between MCU, analog-digital converter ADC2 is between MCU and triode Q1 emitter stages.
A kind of detection method based on above-mentioned detection circuit, including：
Tone frequency channel wire insertion detection module detects the presence of tone frequency channel wire and is inserted into audio terminal, if so, then MCU controls bias voltage
Module is turned on；
Gather resistance R1 and the voltage V1 and electric capacity C1 of electric capacity C1 junctions and the voltage V2 of MCU junctions；
Calculate Δ V, Δ V=V1-V2；
Judge whether the other end of tone frequency channel wire is hanging according to Δ V.
Further, it is described to judge whether the other end of tone frequency channel wire is hanging, includes afterwards according to Δ V：
If the other end of tone frequency channel wire is hanging, the signal of MCU shielding tone frequency channel wire transmission；
If the other end of tone frequency channel wire is not hanging, MCU receives the signal of tone frequency channel wire transmission.
Further, the tone frequency channel wire insertion detection module detects the presence of tone frequency channel wire and is inserted into audio terminal, is specially：
If the detection output of tone frequency channel wire insertion detection module is low level, tone frequency channel wire insertion detection module is judged as nothing
Tone frequency channel wire is inserted into audio terminal；
If the detection output of tone frequency channel wire insertion detection module is high level, tone frequency channel wire insertion detection module is judged as having
Tone frequency channel wire is inserted into audio terminal.
Beneficial effects of the present invention：Detection circuit of the present invention includes：Audio terminal, tone frequency channel wire insertion detection mould
Block, bias voltage module, resistance R1, electric capacity C1, resistance R2 and MCU, the detection pin connection tone frequency channel wire insertion inspection of audio terminal
Survey the detection input of module, the detection output connection MCU of tone frequency channel wire insertion detection module, the L channel pin of audio terminal
Or R channel pin connection resistance R1 one end, the resistance R1 other end and the controlled end of bias voltage module, resistance R2
One end, electric capacity C1 one end connection, resistance R2 other end ground connection, electric capacity C1 other end connection MCU, bias voltage module
Control end connects MCU；The present invention is when tone frequency channel wire insertion detection module has detected tone frequency channel wire and has been inserted into audio terminal, MCU controls
Bias voltage module processed conducting, tone frequency channel wire other end vacantly with not hanging two states, between bias voltage module and ground
Resistance it is of different sizes, can determine whether out whether tone frequency channel wire other end hanging accordingly；MCU according to tone frequency channel wire other end whether
Hanging judged result, makes further control, when tone frequency channel wire other end is hanging, the letter of MCU shielding tone frequency channel wire transmission
Number, avoid tone frequency channel wire that interference signal is incorporated into system with this.
Brief description of the drawings
Fig. 1 is the structural representation of audio terminal；
Fig. 2 is a kind of block diagram of detection circuit for COBBAIF of the present invention；
Fig. 3 is an a kind of physical circuit figure of detection circuit for COBBAIF of the present invention；
Fig. 4 is a kind of flow chart of the detection method based on audio interface circuit of the present invention.
Embodiment
For make present invention solves the technical problem that, the technical scheme that uses and the technique effect that reaches it is clearer, below
The technical scheme of the embodiment of the present invention will be described in further detail with reference to accompanying drawing, it is clear that described embodiment is only
It is a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, those skilled in the art exist
The every other embodiment obtained under the premise of creative work is not made, the scope of protection of the invention is belonged to.
Embodiment one
Fig. 2 is a kind of block diagram of detection circuit for COBBAIF of the present invention.Referring to Fig. 2, one kind is used for COBBAIF
Detection circuit include：Audio terminal, tone frequency channel wire insertion detection module, bias voltage module, resistance R1, electric capacity C1, resistance R2
And MCU, the detection input of the detection pin connection tone frequency channel wire insertion detection module of audio terminal, tone frequency channel wire insertion detection module
Detection output connection MCU, L channel pin or R channel pin connection the resistance R1 of audio terminal one end, resistance R1
The other end and the controlled end of bias voltage module, resistance R2 one end, electric capacity C1 one end connect, resistance R2 another termination
Ground, electric capacity C1 other end connection MCU, the control end connection MCU of bias voltage module.
Audio terminal is inserted in tone frequency channel wire one end, and other end has hanging and not hanging two states：
When tone frequency channel wire other end is not hanging, i.e., when tone frequency channel wire other end is connected with audio frequency apparatus, due to audio frequency apparatus
There is resistance between the left and right acoustic channels circuit and signal ground of port, the audio frequency apparatus of access audio interface circuit can be equivalent to one
Determine the resistance R of resistancex, resistance R1 series resistances R is shown as on circuitxGround connection, i.e. resistance R1 series resistances Rx, then with resistance
R2 is in parallel；The present invention, when tone frequency channel wire insertion detection module, which has detected tone frequency channel wire, is inserted into audio terminal, tone frequency channel wire insertion inspection
Survey module and send a signal to MCU, MCU signal, control bias voltage module unlatchings accordingly makes bias voltage module access circuit；
As described above, when tone frequency channel wire other end is not hanging, resistance R1 series resistances Rx, then it is in parallel with resistance R2, i.e., in the presence of one
Equivalent resistance R=(R1+Rx) //R2, referring to Fig. 2, after bias voltage module is opened, bias voltage module is connect by equivalent resistance R
Ground.
When tone frequency channel wire other end is hanging, i.e. tone frequency channel wire other end is not connected to any load, it is clear that resistance R1 is therefore not
By the detection circuit of access COBBAIF, only resistance R2 accesses the detection circuit of COBBAIF；The present invention, when tone frequency channel wire insertion
When detection module has detected tone frequency channel wire and is inserted into audio terminal, tone frequency channel wire insertion detection module sends a signal to MCU, MCU evidences
This signal, control bias voltage module is opened, and bias voltage module is accessed circuit；As described above, when tone frequency channel wire other end
When hanging, only resistance R2 accesses the detection circuit of COBBAIF, referring to Fig. 2, after bias voltage module is opened, biased electrical pressing mold
Block is grounded by resistance R2.
Therefore, by detecting the size of the resistance between bias voltage module and ground, it can determine whether out tone frequency channel wire in addition
Whether one end is hanging.
The present invention is when tone frequency channel wire insertion detection module has detected tone frequency channel wire and has been inserted into audio terminal, MCU control biasings
Voltage module turn on, tone frequency channel wire other end vacantly with not hanging two states, the resistance between bias voltage module and ground
It is of different sizes, can determine whether out whether tone frequency channel wire other end hanging accordingly；Whether MCU is hanging according to tone frequency channel wire other end
Judged result, makes further control, when tone frequency channel wire other end is hanging, the signal of MCU shielding tone frequency channel wire transmission, with this
Avoid tone frequency channel wire that interference signal is incorporated into system.
Bias voltage module connects the L channel pin or R channel pin of audio terminal, as principle is with effect.
Embodiment two
Fig. 3 is an a kind of physical circuit figure of detection circuit for COBBAIF of the present invention.Referring to Fig. 3, Yi Zhongyong
Include in the detection circuit of COBBAIF：Audio terminal, tone frequency channel wire insertion detection module, bias voltage module, resistance R1, electric capacity
C1, resistance R2 and MCU；
Tone frequency channel wire insertion detection module includes resistance R7 and power supply VCC, resistance R7 one end connection power supply VCC, resistance R7
The other end be used as tone frequency channel wire insertion detection module detection input and tone frequency channel wire insert detection module detection output；
Biasing module includes resistance R6, resistance R5, triode Q1 and power supply VCC, and resistance R5 one end connects power supply VCC,
Resistance R5 other end connecting triode Q1 colelctor electrode, triode Q1 base stage connection resistance R6 one end, resistance R6's is another
One end is used as the control end of bias voltage module, the controlled end of triode Q1 emitter stage connection bias voltage module；
The detection connection tone frequency channel wire of pin 5 of audio terminal inserts the detection input of detection module, tone frequency channel wire insertion detection
The detection output connection MCU of module, L channel pin 2 or R channel pin 3 connection the resistance R1 of audio terminal one end,
The resistance R1 other end and the controlled end of bias voltage module, resistance R2 one end, electric capacity C1 one end are connected, and resistance R2's is another
One end is grounded, electric capacity C1 other end connection MCU, the control end connection MCU of bias voltage module.
Referring to Fig. 3, the 4th pin, the 5th pin, resistance R7 and the power supply VCC composition tone frequency channel wire insertion detection moulds of audio terminal
Block, when tone frequency channel wire is not inserted into audio terminal, the 4th pin, the 5th pin of audio terminal are in connection status, due to audio
The 4th pin ground connection of terminal, so now Line_Det ports are low level；When tone frequency channel wire is inserted into audio terminal, audio
The 4th pin and the 5th pin of terminal are off, and the 5th pin of audio terminal meets power supply VCC by resistance R7, now
Line_Det ports are high level；Obviously, according to the height of Line_Det port levels, you can judge whether there is tone frequency channel wire to insert
Enter to audio terminal.The detection input of tone frequency channel wire insertion detection module and the detection output of tone frequency channel wire insertion detection module are
Line_Det ports in one terminal, i.e. Fig. 3, Line_Det ports are connected with MCU, and MCU is according to Line_Det port levels
Height, judge whether there is tone frequency channel wire to be inserted into audio terminal.
Referring to Fig. 3, the Net_control ports in Fig. 3 are the control end of bias voltage module, Net_control ends
Mouth is connected with MCU, and after MCU judges to have tone frequency channel wire to be inserted into audio terminal, Net_control ports are set to height by MCU
Level, Net_control ports be bias voltage module control end be high level when, triode Q1 conducting so that biased electrical
Die block is linked into circuit.
Audio terminal is inserted in tone frequency channel wire one end, and other end has hanging and not hanging two states：
When tone frequency channel wire other end is not hanging, i.e., when tone frequency channel wire other end is connected with audio frequency apparatus, due to audio frequency apparatus
There is resistance between the left and right acoustic channels circuit and signal ground of port, the audio frequency apparatus of access audio interface circuit can be equivalent to one
Determine the resistance R of resistancex, resistance R1 series resistances R is shown as on circuitxGround connection, i.e. resistance R1 series resistances Rx, then with resistance
R2 earths；The present invention, when Line_Det ports are high level, Net_control ports are set to high level, three by MCU
Pole pipe Q1 is turned on, now resistance R1 series resistances Rx, then with resistance R2 earths, i.e. the emitter stage of triode Q1 passes through equivalent
Resistance R=(R1+Rx) //R2 is grounded；The now magnitude of voltage of A points
When tone frequency channel wire other end is hanging, i.e. tone frequency channel wire other end is not connected to any load, it is clear that resistance R1 is therefore not
By the detection circuit of access COBBAIF, only resistance R2 accesses the detection circuit of COBBAIF；The present invention, when Line_Det ends
When mouth is high level, Net_control ports are set to high level by MCU, and triode Q1 is turned on, and now resistance R2 accesses audio and connect
The detection circuit of mouth, i.e. triode Q1 emitter stage is grounded by resistance R2, now the magnitude of voltage of A points
The magnitude of voltage of B points is constant in voltage between electric capacity C1 and MCU, i.e. Fig. 3, and the magnitude of voltage of B points is in note Fig. 3
V2, the magnitude of voltage V1 of A points size is judged with magnitude of voltage V2, you can judge whether tone frequency channel wire other end is hanging；Make Δ V
V1-V2 can be realized on=V1-V2, circuit with subtracter；When tone frequency channel wire other end is hanging, Δ V now is calculated, audio is made
Δ V when line other end is hanging is Δ V0；Obviously, when tone frequency channel wire other end is connected with audio frequency apparatus, Δ V=V1-V2
Δ V should be less than0, so, compare Δ V and Δ V0Size, can determine whether out whether tone frequency channel wire other end hanging；Compare Δ V with
ΔV0Size, can be realized with comparator on circuit, when comparative result is Δ V=Δs V0, then tone frequency channel wire other end is hanging, when
Comparative result is that Δ V is less than Δ V0, then tone frequency channel wire other end is not hanging.
Further, a kind of detection circuit for COBBAIF of the invention also includes analog-digital converter ADC1 and modulus turns
Parallel operation ADC2, analog-digital converter ADC1 are between electric capacity C1 and MCU, and analog-digital converter ADC2 is in MCU and triode Q1 emitter stages
Between, analog signal is converted into data signal and sent to MCU by analog-digital converter ADC1 and analog-digital converter ADC2.
The present invention is when tone frequency channel wire insertion detection module has detected tone frequency channel wire and has been inserted into audio terminal, MCU control biasings
Voltage module turn on, tone frequency channel wire other end vacantly with not hanging two states, the resistance between bias voltage module and ground
It is of different sizes, can determine whether out whether tone frequency channel wire other end hanging accordingly；Whether MCU is hanging according to tone frequency channel wire other end
Judged result, makes further control, when tone frequency channel wire other end is hanging, the signal of MCU shielding tone frequency channel wire transmission, with this
Avoid tone frequency channel wire that interference signal is incorporated into system.
Embodiment three
Fig. 4 is a kind of flow chart of the detection method based on audio interface circuit of the present invention.
Referring to Fig. 4, a kind of detection method based on audio interface circuit, including：
S101, tone frequency channel wire insertion detection module detect the presence of tone frequency channel wire and are inserted into audio terminal, if so, then performing S102；
In step S101, tone frequency channel wire insertion detection module detects the presence of tone frequency channel wire and is inserted into audio terminal, is specially：If sound
The Line_Det ports that frequency line is inserted in the detection output of detection module, i.e. Fig. 3 are low level, then tone frequency channel wire insertion detection mould
Block is judged as that no tone frequency channel wire is inserted into audio terminal；If tone frequency channel wire is inserted in the detection output of detection module, i.e. Fig. 3
Line_Det ports are high level, then tone frequency channel wire insertion detection module is judged as having tone frequency channel wire to be inserted into audio terminal.
S102, MCU control bias voltage module conducting；
In step S102, Line_Det ports are connected to MCU, the MCU when MCU detects Line_Det ports for high level
Bias voltage module conducting is controlled, i.e. the Net_control ports of bias voltage module are set to high level, Net_ by MCU
Control ports are high level, triode Q1 conductings.
The voltage V2 of S103, collection resistance R1 and electric capacity C1 junctions voltage V1 and electric capacity C1 and MCU junction；
In step S103, the other end of tone frequency channel wire vacantly with not hanging two states, triode Q1 emitter stage with
Resistance between ground is different：It is equivalent between triode Q1 emitter stage and ground when tone frequency channel wire other end is not hanging
Resistance R=(R1+Rx)//R2；When tone frequency channel wire other end is hanging, the resistance between triode Q1 emitter stage and ground is R2；
Resistance between triode Q1 emitter stage and ground is different, causes the magnitude of voltage V1 of A points in Fig. 3 different, draws
The magnitude of voltage V2 for entering B points in Fig. 3 makes reference, and makes Δ V=V1-V2.
S104, calculating Δ V, Δ V=V1-V2；
S105, according to Δ V judge tone frequency channel wire the other end it is whether hanging, if so, S107 is then performed, if it is not, then performing
S106；
In step S105, when tone frequency channel wire other end is hanging, Δ V now is calculated0；Obviously, when tone frequency channel wire in addition
When one end is connected with audio frequency apparatus, Δ V=V1-V2 should be less than Δ V0, so, according to Δ V and Δ V0Size, can determine whether out
Whether tone frequency channel wire other end is hanging.
The magnitude of voltage V2 of the B points referred in the present invention refers to the DC voltage at B points, and the magnitude of voltage V1 of the A points referred to also refers to A
DC voltage at point, Δ V=V1-V2 is the comparison between DC voltage, not including alternating component.
S106, MCU receive the signal of tone frequency channel wire transmission；
The signal of S107, MCU shielding tone frequency channel wire transmission；
Step S106 and S107, according to the whether hanging result of determination of the tone frequency channel wire other end, can take different replies to arrange
Apply, when tone frequency channel wire other end is hanging, the signal of MCU shielding tone frequency channel wire transmission avoids tone frequency channel wire from drawing interference signal with this
Enter to system.
The present invention is when tone frequency channel wire insertion detection module has detected tone frequency channel wire and has been inserted into audio terminal, MCU control biasings
Voltage module turn on, tone frequency channel wire other end vacantly with not hanging two states, the resistance between bias voltage module and ground
It is of different sizes, can determine whether out whether tone frequency channel wire other end hanging accordingly；Whether MCU is hanging according to tone frequency channel wire other end
Judged result, makes further control, when tone frequency channel wire other end is hanging, the signal of MCU shielding tone frequency channel wire transmission, with this
Avoid tone frequency channel wire that interference signal is incorporated into system.
" first ", " second ", " the 3rd ", " 4th " herein in description just for the sake of being distinguish between, not
Special implication.
It is to be understood that, above-mentioned embodiment is only that presently preferred embodiments of the present invention and institute's application technology are former
Reason, in technical scope disclosed in this invention, change that any one skilled in the art is readily apparent that or
Replace, should all cover within the scope of the present invention.
Claims (7)
1. a kind of detection circuit for COBBAIF, it is characterised in that including：Audio terminal, tone frequency channel wire insertion detection module,
Bias voltage module, resistance R1, electric capacity C1, resistance R2 and MCU；The detection pin connection tone frequency channel wire insertion detection mould of audio terminal
The detection input of block, tone frequency channel wire insertion detection module detection output connection MCU, the L channel pin of audio terminal or
R channel pin connection resistance R1 one end, the resistance R1 other end and the controlled end of bias voltage module, resistance R2 one end,
Electric capacity C1 one end connection, resistance R2 other end ground connection, electric capacity C1 other end connection MCU, the control of bias voltage module
End connection MCU.
2. a kind of detection circuit for COBBAIF according to claim 1, it is characterised in that tone frequency channel wire insertion detection
Module includes resistance R7 and power supply VCC, resistance R7 one end connection power supply VCC, and the resistance R7 other end is respectively as tone frequency channel wire
The detection input and tone frequency channel wire for inserting detection module insert the detection output of detection module.
3. a kind of detection circuit for COBBAIF according to claim 1, it is characterised in that biasing module includes electricity
The other end for hindering R6, resistance R5, triode Q1 and power supply VCC, resistance R5 one end connection power supply VCC, resistance R5 connects three poles
Pipe Q1 colelctor electrode, triode Q1 base stage connection resistance R6 one end, the resistance R6 other end is used as bias voltage module
Control end, triode Q1 emitter stage connects the controlled end of bias voltage module.
4. a kind of detection circuit for COBBAIF according to claim 1, it is characterised in that also including analog-to-digital conversion
Device ADC1 and analog-digital converter ADC2, analog-digital converter ADC1 between electric capacity C1 and MCU, analog-digital converter ADC2 MCU with
Between triode Q1 emitter stages.
5. a kind of detection method based on any one of the claim 1-4 detection circuits, it is characterised in that including：
Tone frequency channel wire insertion detection module detects the presence of tone frequency channel wire and is inserted into audio terminal, if so, then MCU controls bias voltage module
Conducting；
Gather resistance R1 and the voltage V1 and electric capacity C1 of electric capacity C1 junctions and the voltage V2 of MCU junctions；
Calculate Δ V, Δ V=V1-V2；
Judge whether the other end of tone frequency channel wire is hanging according to Δ V.
6. detection method according to claim 5, it is characterised in that it is described tone frequency channel wire is judged according to Δ V the other end be
It is no hanging, include afterwards：
If the other end of tone frequency channel wire is hanging, the signal of MCU shielding tone frequency channel wire transmission；
If the other end of tone frequency channel wire is not hanging, MCU receives the signal of tone frequency channel wire transmission.
7. detection method according to claim 5, it is characterised in that the tone frequency channel wire insertion detection module detects the presence of sound
Frequency line is inserted into audio terminal, is specially：
If the detection output of tone frequency channel wire insertion detection module is low level, tone frequency channel wire insertion detection module is judged as no audio
Line is inserted into audio terminal；
If the detection output of tone frequency channel wire insertion detection module is high level, tone frequency channel wire insertion detection module is judged as there is audio
Line is inserted into audio terminal.
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| CN106771708B (en) * | 2016-11-15 | 2020-02-14 | 深圳Tcl数字技术有限公司 | Hot plug test method and device for interconnection power supply of master equipment and slave equipment |
| CN109560413B (en) * | 2018-11-28 | 2024-02-23 | 联宝(合肥)电子科技有限公司 | Audio interface and electronic equipment |
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