CN107396226A - A kind of earphone compatible circuit, mobile terminal and electronic system - Google Patents
A kind of earphone compatible circuit, mobile terminal and electronic system Download PDFInfo
- Publication number
- CN107396226A CN107396226A CN201710727906.7A CN201710727906A CN107396226A CN 107396226 A CN107396226 A CN 107396226A CN 201710727906 A CN201710727906 A CN 201710727906A CN 107396226 A CN107396226 A CN 107396226A
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- earphone
- input
- nmos tube
- control
- mic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1041—Mechanical or electronic switches, or control elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Telephone Function (AREA)
Abstract
The invention discloses a kind of earphone compatible circuit, the compatible circuit includes：MIC modules, control module and earphone interface；The MIC modules, its test side are connected with the test side of the earphone interface, and its input is connected with the input of the control module, for detected earphone insert the earphone interface when, to the control module input voltage signal；The control module, its control terminal is connected with the input of the earphone interface, and its output end is connected with the reference voltage end of the MIC modules, for according to the voltage signal received, control flows into the current direction of the earphone interface, and output reference voltage is to the MIC modules；The MIC modules, it is additionally operable to when detecting the reference voltage, triggers the start-up operation of itself left and right sound channels.The invention also discloses a kind of mobile terminal and electronic system, by implementing technical scheme, is capable of the earphone of compatible two kinds of various criterions.
Description
Technical field
The present invention relates to design of electronic circuits technical field, more particularly to a kind of earphone compatible electricity for mobile terminal
Road, mobile terminal and electronic system.
Background technology
With the rapid development of communication technology, the function of the mobile terminal such as mobile phone is more and more, the joy that can be realized on computer
Happy function, most of all to have realized on mobile terminals, people can on mobile terminals see a film, play game, browse
Webpage, Video chat, listen music etc..
Currently when carrying out music using mobile terminal, it can generally be listened to by earphone.At present on the market
Earphone for mobile terminal has two kinds of standards, i.e. national standard earphone and American Standard earphone.The difference of the two is：MIC signals with
GND signals are exchanged.American Standard earphone is ordered as successively from the signal at headset plug：L channel, R channel, earth signal, MIC letters
Number.And national standard earphone signal at headset plug is ordered as successively：L channel, R channel, MIC signals, GND signals.Work as movement
(such as American Standard mobile terminal uses national standard earphone, national standard movement when the headset designs standard of terminal and inconsistent earphone standard signal
Terminal uses American Standard standard earphone), just occur that earphone plays the situation of no sound or earpiece volume very little, so user
Earphone ability normal use must be changed, influences Consumer's Experience.
The content of the invention
It is a primary object of the present invention to propose it is a kind of applied to the earphone compatible circuit of mobile terminal, mobile terminal and
Electronic system, it is capable of the earphone of compatible two kinds of various criterions.
To achieve the above object, a kind of earphone compatible circuit provided by the invention, the compatible circuit include：
MIC modules, control module and earphone interface；
The test side of the MIC modules is connected with the test side of the earphone interface, the input of the MIC modules and institute
The input for stating control module is connected, and the MIC modules are used for when having detected that earphone inserts the earphone interface, to described
Control module input voltage signal；
The control terminal of the control module is connected with the input of the earphone interface, the output end of the control module with
The reference voltage end of the MIC modules is connected, and the control module is used to be flowed into according to the voltage signal received, control
The current direction of the earphone interface, and output reference voltage is to the MIC modules；
The MIC modules, it is additionally operable to when detecting the reference voltage, triggers the start-up operation of itself left and right sound channels.
Wherein, the control module includes：
In parallel first flows to control circuit and second and flows to control circuit；Described first flows to the input of control circuit
It is connected with second input for flowing to control circuit；Described first flows to the control terminal and the described second flow direction of control circuit
The control terminal of control circuit is connected；Described first, which flows to the output end of control circuit and described second, flows to the output of control circuit
End is connected；
When the MIC modules input the voltage signal to the control module, described first, which flows to control circuit, leads
It is logical and described second flows to control circuit cut-off, first-class end and export described with reference to electricity to conducting and the second flow direction to control
It is depressed into the MIC modules；Or described second flow to control circuit conducting and first flow to control circuit cut-off, to control second
To conducting and the first flow direction cut-off, and the reference voltage is exported to the MIC modules.
Wherein, the sense of current of first flow direction is from ground to MIC；The sense of current of second flow direction is from MIC
To ground.
Wherein, described first flow to control circuit and include：First resistor, the first electric capacity, the first PMOS, the first NMOS tube
And second NMOS tube；
Wherein, one end of the first resistor is as the described first input for flowing to control circuit, respectively with the MIC
The input of module, the source electrode of first PMOS are connected, and the other end of the first resistor connects first electricity respectively
The drain electrode of one end of appearance, the grid of first PMOS and first NMOS tube, another termination of first electric capacity
Ground；
The grid of first PMOS connects the drain electrode of first NMOS tube, and the drain electrode of first PMOS is simultaneously
Connect the input of the grid of first NMOS tube, the grid of the second NMOS tube and the earphone interface；Described first
The source ground of NMOS tube；
The grid of second NMOS tube connects the grid of first NMOS tube, the input of the earphone interface, institute
The drain electrode for stating the second NMOS tube connects the input of the earphone interface；The source electrode of second NMOS tube is as described first-class
To the output end of control circuit, the reference voltage end of the MIC modules is connected.
Wherein, described second flow to control circuit and include：Second resistance, the second electric capacity, the second PMOS, the 3rd NMOS tube
And the 4th NMOS tube；
Wherein, one end of the second resistance is as the described second input for flowing to control circuit, respectively with the MIC
The input of module, the source electrode of second PMOS are connected, and the other end of the second resistance connects second electricity respectively
The drain electrode of one end of appearance, the grid of second PMOS and the 3rd NMOS tube, another termination of second electric capacity
Ground；
The grid of second PMOS connects the drain electrode of the 3rd NMOS tube, and the drain electrode of second PMOS is simultaneously
Connect grid, the grid of the 4th NMOS tube and the input of the earphone interface of the 3rd NMOS tube；Described 3rd
The source ground of NMOS tube；
The grid of 4th NMOS tube connects the grid of the 3rd NMOS tube, the input of the earphone interface, institute
The drain electrode for stating the 4th NMOS tube connects the input of the earphone interface；The source electrode of 4th NMOS tube is as described first-class
To the output end of control circuit, the reference voltage end of the MIC modules is connected.
Wherein, the MIC modules also include：L channel control terminal and R channel control terminal；
The L channel control terminal is connected with the left channel interface of the earphone interface, ear described in the R channel control terminal
The left channel interface connection of machine interface.
Wherein, the MIC modules also include：Biased electrical pressure side, and 3rd resistor；
One end of the 3rd resistor connects the biased electrical pressure side, and the other end connects the input of the MIC modules, with
And the input of the control module.
Wherein, the MIC modules also include：4th resistance and the 5th resistance；
One end of 4th resistance connects the left channel interface of the L channel control terminal and the earphone interface respectively,
The other end is grounded；
One end of 5th resistance connects the right channel interface of the R channel control terminal and the earphone interface respectively,
The other end is grounded.
Correspondingly, present invention also offers a kind of mobile terminal, including the earphone compatible circuit described in any of the above-described.
Correspondingly, present invention also offers a kind of electronic system, mobile terminal and earphone described above.
The beneficial effects of the invention are as follows：
The technical scheme of the embodiment of the present invention, it is probably American Standard or national standard due to inserting the standard of earphone of earphone interface,
When the earphone of various criterion inserts earphone interface, control module energy controlling stream enters the current direction of earphone interface so that control
The output end of module all the time can output reference voltage to MIC modules reference voltage end (HPH-REF pins), so as to trigger
The left and right acoustic channels of MIC modules are started working, and form L channel, R channel, earth signal, the loop of MIC signals, or form left sound
Road, R channel, MIC signals, the loop of GND signals, and then enable the earphone of the compatible various criterion of earphone compatible circuit.
Brief description of the drawings
Fig. 1 is the hardware architecture diagram for the mobile terminal for realizing each embodiment of the present invention；
Fig. 2 is the wireless communication system schematic diagram of mobile terminal as shown in Figure 1；
Fig. 3 is the structural representation of the first embodiment of the earphone compatible circuit of the present invention；
Fig. 4 is the structural representation of the second embodiment of the earphone compatible circuit of the present invention；
Fig. 5 is MIC performance loop schematic diagrames when the circuit in Fig. 4 uses American Standard earphone；
Fig. 6 is earphone horn performance loop schematic diagram when the circuit in Fig. 4 uses American Standard earphone；
Fig. 7 is MIC performance loop schematic diagrames when the circuit in Fig. 4 uses national standard earphone；
Fig. 8 is earphone horn performance loop schematic diagram when the circuit in Fig. 4 uses national standard earphone；
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
In follow-up description, the suffix using such as " module ", " part " or " unit " for representing element is only
Be advantageous to the explanation of the present invention, itself there is no a specific meaning.Therefore, " module ", " part " or " unit " can mix
Ground uses.
The image processing method of the moving object provided in the present invention, it can apply to various terminals and computer-readable
Storage medium.Wherein, terminal can be implemented in a variety of manners.For example, the terminal described in the present invention can include such as hand
Machine, tablet personal computer, notebook computer, palm PC, personal digital assistant (Personal Digital Assistant, PDA),
Portable media player (Portable Media Player, PMP), guider, wearable device, Intelligent bracelet, meter step
The mobile terminals such as device, and the fixed terminal such as digital TV, desktop computer.
It will be illustrated in subsequent descriptions by taking mobile terminal as an example, it will be appreciated by those skilled in the art that except special
Outside element for moving purpose, construction according to the embodiment of the present invention can also apply to the terminal of fixed type.
Referring to Fig. 1, its hardware architecture diagram for a kind of mobile terminal of each embodiment of the realization present invention, the shifting
Dynamic terminal 100 can include：RF (Radio Frequency, radio frequency) unit 101, WiFi module 102, audio output unit
103rd, A/V (audio/video) input block 104, sensor 105, display unit 106, user input unit 107, interface unit
108th, the part such as memory 109, processor 110 and power supply 111.It will be understood by those skilled in the art that shown in Fig. 1
Mobile terminal structure does not form the restriction to mobile terminal, and mobile terminal can be included than illustrating more or less parts,
Either combine some parts or different parts arrangement.
The all parts of mobile terminal are specifically introduced with reference to Fig. 1：
Radio frequency unit 101 can be used for receiving and sending messages or communication process in, the reception and transmission of signal, specifically, by base station
Downlink information receive after, handled to processor 110；In addition, up data are sent to base station.Generally, radio frequency unit 101
Including but not limited to antenna, at least one amplifier, transceiver, coupler, low-noise amplifier, duplexer etc..In addition, penetrate
Frequency unit 101 can also be communicated by radio communication with network and other equipment.Above-mentioned radio communication can use any communication
Standard or agreement, including but not limited to GSM (Global System of Mobile communication, global system for mobile telecommunications
System), GPRS (General Packet Radio Service, general packet radio service), CDMA2000 (Code
Division Multiple Access 2000, CDMA 2000), WCDMA (Wideband Code Division
Multiple Access, WCDMA), TD-SCDMA (Time Division-Synchronous Code
Division Multiple Access, TD SDMA), FDD-LTE (Frequency Division
Duplexing-Long Term Evolution, FDD Long Term Evolution) and TDD-LTE (Time Division
Duplexing-Long Term Evolution, time division duplex Long Term Evolution) etc..
WiFi belongs to short range wireless transmission technology, and mobile terminal can help user to receive and dispatch electricity by WiFi module 102
Sub- mail, browse webpage and access streaming video etc., it has provided the user wireless broadband internet and accessed.Although Fig. 1 shows
Go out WiFi module 102, but it is understood that, it is simultaneously not belonging to must be configured into for mobile terminal, completely can be according to need
To be omitted in the essential scope for do not change invention.
Audio output unit 103 can be in call signal reception pattern, call mode, record mould in mobile terminal 100
When under the isotypes such as formula, speech recognition mode, broadcast reception mode, by radio frequency unit 101 or WiFi module 102 it is receiving or
It is sound that the voice data stored in memory 109, which is converted into audio signal and exported,.Moreover, audio output unit 103
The audio output related to the specific function that mobile terminal 100 performs can also be provided (for example, call signal receives sound, disappeared
Breath receives sound etc.).Audio output unit 103 can include loudspeaker, buzzer etc..
A/V input blocks 104 are used to receive audio or video signal.A/V input blocks 104 can include graphics processor
(Graphics Processing Unit, GPU) 1041 and microphone 1042, graphics processor 1041 is in video acquisition mode
Or the static images or the view data of video obtained in image capture mode by image capture apparatus (such as camera) are carried out
Reason.Picture frame after processing may be displayed on display unit 106.Picture frame after the processing of graphics processor 1041 can be deposited
Storage is transmitted in memory 109 (or other storage mediums) or via radio frequency unit 101 or WiFi module 102.Mike
Wind 1042 can connect in telephone calling model, logging mode, speech recognition mode etc. operational mode via microphone 1042
Quiet down sound (voice data), and can be voice data by such acoustic processing.Audio (voice) data after processing can
To be converted to the form output that mobile communication base station can be sent to via radio frequency unit 101 in the case of telephone calling model.
Microphone 1042 can implement various types of noises and eliminate (or suppression) algorithm to eliminate (or suppression) in reception and send sound
Caused noise or interference during frequency signal.
Mobile terminal 100 also includes at least one sensor 105, such as optical sensor, motion sensor and other biographies
Sensor.Specifically, optical sensor includes ambient light sensor and proximity transducer, wherein, ambient light sensor can be according to environment
The light and shade of light adjusts the brightness of display panel 1061, and proximity transducer can close when mobile terminal 100 is moved in one's ear
Display panel 1061 and/or backlight.As one kind of motion sensor, accelerometer sensor can detect in all directions (general
For three axles) size of acceleration, size and the direction of gravity are can detect that when static, the application available for identification mobile phone posture
(such as horizontal/vertical screen switching, dependent game, magnetometer pose calibrating), Vibration identification correlation function (such as pedometer, percussion) etc.；
The fingerprint sensor that can also configure as mobile phone, pressure sensor, iris sensor, molecule sensor, gyroscope, barometer,
The other sensors such as hygrometer, thermometer, infrared ray sensor, will not be repeated here.
Display unit 106 is used for the information for showing the information inputted by user or being supplied to user.Display unit 106 can wrap
Display panel 1061 is included, liquid crystal display (Liquid Crystal Display, LCD), Organic Light Emitting Diode can be used
Forms such as (Organic Light-Emitting Diode, OLED) configures display panel 1061.
User input unit 107 can be used for the numeral or character information for receiving input, and produce the use with mobile terminal
The key signals input that family is set and function control is relevant.Specifically, user input unit 107 may include contact panel 1071 with
And other input equipments 1072.Contact panel 1071, also referred to as touch-screen, collect touch operation of the user on or near it
(for example user uses any suitable objects or annex such as finger, stylus on contact panel 1071 or in contact panel 1071
Neighbouring operation), and corresponding attachment means are driven according to formula set in advance.Contact panel 1071 may include touch detection
Two parts of device and touch controller.Wherein, the touch orientation of touch detecting apparatus detection user, and detect touch operation band
The signal come, transmits a signal to touch controller；Touch controller receives touch information from touch detecting apparatus, and by it
Contact coordinate is converted into, then gives processor 110, and the order sent of reception processing device 110 and can be performed.In addition, can
To realize contact panel 1071 using polytypes such as resistance-type, condenser type, infrared ray and surface acoustic waves.Except contact panel
1071, user input unit 107 can also include other input equipments 1072.Specifically, other input equipments 1072 can wrap
Include but be not limited to physical keyboard, in function key (such as volume control button, switch key etc.), trace ball, mouse, action bars etc.
One or more, do not limit herein specifically.
Further, contact panel 1071 can cover display panel 1061, detect thereon when contact panel 1071 or
After neighbouring touch operation, processor 110 is sent to determine the type of touch event, is followed by subsequent processing device 110 according to touch thing
The type of part provides corresponding visual output on display panel 1061.Although in Fig. 1, contact panel 1071 and display panel
1061 be the part independent as two to realize the input of mobile terminal and output function, but in certain embodiments, can
Input and the output function of mobile terminal are realized so that contact panel 1071 and display panel 1061 is integrated, is not done herein specifically
Limit.
Interface unit 108 is connected the interface that can pass through as at least one external device (ED) with mobile terminal 100.For example,
External device (ED) can include wired or wireless head-band earphone port, external power source (or battery charger) port, wired or nothing
Line FPDP, memory card port, the port for connecting the device with identification module, audio input/output (I/O) end
Mouth, video i/o port, ear port etc..Interface unit 108 can be used for receiving the input from external device (ED) (for example, number
It is believed that breath, electric power etc.) and the input received is transferred to one or more elements in mobile terminal 100 or can be with
For transmitting data between mobile terminal 100 and external device (ED).
Memory 109 can be used for storage software program and various data.Memory 109 can mainly include storing program area
And storage data field, wherein, storing program area can storage program area, application program (such as the sound needed at least one function
Sound playing function, image player function etc.) etc.；Storage data field can store according to mobile phone use created data (such as
Voice data, phone directory etc.) etc..In addition, memory 109 can include high-speed random access memory, can also include non-easy
The property lost memory, a for example, at least disk memory, flush memory device or other volatile solid-state parts.
Processor 110 is the control centre of mobile terminal, utilizes each of various interfaces and the whole mobile terminal of connection
Individual part, by running or performing the software program and/or module that are stored in memory 109, and call and be stored in storage
Data in device 109, the various functions and processing data of mobile terminal are performed, so as to carry out integral monitoring to mobile terminal.Place
Reason device 110 may include one or more processing units；Preferably, processor 110 can integrate application processor and modulatedemodulate is mediated
Device is managed, wherein, application processor mainly handles operating system, user interface and application program etc., and modem processor is main
Handle radio communication.It is understood that above-mentioned modem processor can not also be integrated into processor 110.
Mobile terminal 100 can also include the power supply 111 (such as battery) to all parts power supply, it is preferred that power supply 111
Can be logically contiguous by power-supply management system and processor 110, so as to realize management charging by power-supply management system, put
The function such as electricity and power managed.
Although Fig. 1 is not shown, mobile terminal 100 can also will not be repeated here including bluetooth module etc..
For the ease of understanding the embodiment of the present invention, the communications network system being based on below to the mobile terminal of the present invention enters
Row description.
Referring to Fig. 2, Fig. 2 is a kind of communications network system Organization Chart provided in an embodiment of the present invention, the communication network system
Unite as the LTE system of universal mobile communications technology, the UE that the LTE system includes communicating connection successively (User Equipment, is used
Family equipment) 201, E-UTRAN (Evolved UMTS Terrestrial Radio Access Network, evolved UMTS lands
Ground wireless access network) 202, EPC (Evolved Packet Core, evolved packet-based core networks) 203 and operator IP operation
204。
Specifically, UE201 can be above-mentioned terminal 100, and here is omitted.
E-UTRAN202 includes eNodeB2021 and other eNodeB2022 etc..Wherein, eNodeB2021 can be by returning
Journey (backhaul) (such as X2 interface) is connected with other eNodeB2022, and eNodeB2021 is connected to EPC203,
ENodeB2021 can provide UE201 to EPC203 access.
EPC203 can include MME (Mobility Management Entity, mobility management entity) 2031, HSS
(Home Subscriber Server, home subscriber server) 2032, other MME2033, SGW (Serving Gate Way,
Gateway) 2034, PGW (PDN Gate Way, grouped data network gateway) 2035 and PCRF (Policy and
Charging Rules Function, policy and rate functional entity) 2036 etc..Wherein, MME2031 be processing UE201 and
The control node of signaling between EPC203, there is provided carrying and connection management.HSS2032 is all to manage for providing some registers
Such as the function of attaching position register (not shown) etc, and preserve some and used about service features, data rate etc.
The special information in family.All customer data can be transmitted by SGW2034, and PGW2035 can provide UE 201 IP
Address is distributed and other functions, and PCRF2036 is strategy and the charging control strategic decision-making of business data flow and IP bearing resources
Point, it selects and provided available strategy and charging control decision-making with charge execution function unit (not shown) for strategy.
IP operation 204 can include internet, Intranet, IMS (IP Multimedia Subsystem, IP multimedia
System) or other IP operations etc..
Although above-mentioned be described by taking LTE system as an example, those skilled in the art it is to be understood that the present invention not only
Suitable for LTE system, be readily applicable to other wireless communication systems, such as GSM, CDMA2000, WCDMA, TD-SCDMA with
And following new network system etc., do not limit herein.
Based on above-mentioned mobile terminal hardware configuration and communications network system, each embodiment of the inventive method is proposed.
As shown in figure 3, it is that the structure of first embodiment of the earphone compatible circuit applied to mobile terminal of the present invention is shown
It is intended to.Wherein, mobile terminal equipment such as can apply to smart mobile phone, tablet personal computer, personal digital assistant.
As shown in figure 3, the earphone compatible circuit 300 includes：MIC modules 31, control module 32 and earphone interface 33.
Wherein, the test side (HS-DET pins) of MIC modules 31 is connected with the test side (DET ends) of earphone interface 33, MIC
The input (Mic-in pins) of module 31 is connected with the input of control module 32, for detecting earphone insertion earphone
During interface 33, to the input voltage signal of control module 32.And the control terminal of control module 32 and the input phase of earphone interface 33
Even, the output end of control module 32 is connected with the reference voltage end (HPH-REF pins) of MIC modules 31, and control module 32 is used for
According to the voltage signal received, the current direction of the earphone of control insertion earphone interface 33, and output reference voltage to MIC moulds
Block 31；The reference voltage end (HPH-REF pins) of MIC modules 31 triggers itself left and right sound channels and opened when receiving reference voltage
Beginning work.
In the embodiment of the present invention, it is probably American Standard or national standard due to inserting the standard of earphone of earphone interface 33, works as difference
During the earphone insertion earphone interface of standard, the energy controlling stream of control module 32 enters the current direction of earphone interface 33 so that control mould
The output end of block 32 all the time can output reference voltage to MIC modules 31 reference voltage end (HPH-REF pins), so as to touch
The left and right acoustic channels for sending out MIC modules 31 are started working, and form L channel, R channel, earth signal, the loop of MIC signals, or formed
L channel, R channel, MIC signals, the loop of GND signals, and then enable the compatible various criterion of earphone compatible circuit
Earphone.
It should be noted that control module 32 can include：
In parallel first flows to control circuit and second and flows to control circuit；First flows to the input of control circuit and
Two inputs for flowing to control circuit are connected, and first, which flows to the input of control circuit and second, flows to the input of control circuit
Collectively as the input of control module 32；First, which flows to the control terminal of control circuit and second, flows to the control terminal of control circuit
It is connected, first, which flows to the control terminal of control circuit and second, flows to control of the control terminal collectively as control module 32 of control circuit
End processed；The output end that first output end for flowing to control circuit flows to control circuit with second is connected, and first flows to control circuit
Output end and the second output end of the output end collectively as control module 32 for flowing to control circuit；
Wherein, the sense of current of the first flow direction is from ground to MIC；The sense of current of second flow direction is from MIC to ground.It is
Say, first flow to control circuit controlling stream enter the sense of current of earphone interface 33 for arrive MIC, second flows to control circuit control
The sense of current for flowing into earphone interface 33 is MIC to ground.
When MIC modules 31 are to 32 input voltage signal of control module, according to insertion earphone interface 33 earphone standard,
First flow to control circuit conducting and second flow to control circuit cut-off, with control it is first-class to conducting and second flow direction cut-off simultaneously
The reference voltage is exported to the MIC modules；Second flow to control circuit conducting and first flow to control circuit cut-off, with control
Second processed ends to conducting and the first flow direction, and exports the reference voltage to the MIC modules.
Wherein, first flow to control circuit flowed to second control circuit structure it is identical, may each comprise：Resistance, electricity
Hold, PMOS and two NMOS tubes.Below, by by the embodiment shown in Fig. 4, control module 32 of the invention is described in detail.
As shown in figure 4, it is the structure of the second embodiment of the earphone compatible circuit 300 applied to mobile terminal of the present invention
Schematic diagram.Wherein, mobile terminal equipment such as can apply to smart mobile phone, tablet personal computer, personal digital assistant.
As shown in figure 4, in the earphone compatible circuit, PMOS Q1 (the first PMOS) source electrode connection codec IC (MIC
Module 31) MIC_in pins, MIC_in pins are pulled to Mic_bias (biased electrical pressure side) by Rp resistance (3rd resistor)
The power supply of output, PMOS Q1 drain electrode are connected to the input (M/G pins) of earphone interface, resistance R1 (first resistor) and electricity
Hold C1 (the first electric capacity) composition series circuits, the grid of the connected position connection PMOS Q1 between resistance R1 and electric capacity C1 devices
With NMOS tube (the first NMOS tube) Q2 drain electrode, the earth signal of NMOS tube Q2 source electrode connection mainboard, NMOS tube Q2 grid connects
Meet PMOS Q1 drain electrode, the input (M/G pins) of NMOS tube (the 4th NMOS tube) Q3 drain electrode connection earphone interface, NMOS
Pipe Q3 grid connection PMOS Q4 (the second PMOS) drain electrode, NMOS tube Q3 source electrode connection codec IC (MIC modules
31) HPH_REF pins (reference voltage end)；PMOS Q4 source electrode connection codec IC MIC_in pins (input),
PMOS Q4 drain electrode is connected to the G/M signal pins (input) of earphone interface 33, resistance R2 (second resistance) and electric capacity C2
(the second electric capacity) forms series circuit, the grid of the connected position connection PMOS Q4 between resistance R2 and electric capacity C2 devices with
NMOS tube (the 3rd NMOS tube) Q5 drain electrode, the earth signal of NMOS tube Q5 source electrode connection mainboard, NMOS tube Q5 grid connection
PMOS Q4 drain electrode, the G/M pins of NMOS tube (the second NMOS tube) Q6 drain electrode connection earphone interface 33, NMOS tube Q6 grid
Pole connection PMOS Q1 drain electrode, NMOS tube Q6 source electrode connection codec IC HPH_REF pins (reference voltage end).
Codec IC HS_L, HS_R connects left and right acoustic channels L, R of earphone interface, Codec IC HS_DET connection earphone interfaces respectively
Test side (DET ends, for plugging headset detection).
The operation principle of this earphone compatible circuit is as follows：
When the earphone for having American Standard inserts earphone interface 33, that is, inserting the pin of the earphone of earphone interface input is：M/G
The flow direction of electric current is in pin, i.e. earphone：MIC to ground.Due to the DET ends of Codec IC HS_DET connection earphone interfaces, when
When having detected earphone insertion, Codec IC controls Mic_bias is upper electric, and voltage is from 0V liters on Codec IC Mic_in pins
To Vmic_in, Vmic_in gradually passes through R1 and C1 is charged in the process, and PMOS Q1 grid voltages slowly raise, and PMOS
The pipe Q1 source electrode rate of rise is faster than gate boost speed, so voltage rises to Vmic_in process from 0V on Mic_in pins
Middle PMOS Q1 is just begun to turn on, and its drain voltage starts to raise after PMOS Q1 is begun to turn on, when PMOS Q1 drain electrode electricity
After pressure reaches the cut-in voltage VGS (TH) of NMOS tube Q2, Q6, NMOS tube Q2, Q6 is begun to turn on, after NMOS tube Q2 is begun to turn on
PMOS Q1 grid voltage is begun to decline, so as to which PMOS Q1 is fully on, its drain voltage after PMOS Q1 is fully on
Rise, and then make NMOS tube Q6 fully on.
Meanwhile when on Mic_in pins voltage rise to Vmic_in during this from 0V, Vmic_in voltages gradually pass through R2
C2 is charged, PMOS Q4 grid voltages slowly raise, and the PMOS Q4 source electrode rate of rise is faster than gate boost speed, institute
With voltage on Mic_in pins from 0V rise to Vmic_in during PMOS Q4 just begin to turn on, therefore PMOS Q4 drain electrode
Voltage also begins to raise, but due to PMOS Q4 drain electrode connection be American Standard earphone G-signal (), therefore its drain voltage quilt
It is pulled in below 0.2V, and after R2 is fully charged to C2, PMOS Q4 source voltage terminals and grid voltage are about the same, therefore PMOS
Pipe Q4 ends.
Now, because NMOS tube Q6 is fully on and PMOS Q4 ends, current direction is as indicated by thick solid lines shown in fig. 5.
Now, have voltage signal (reference voltage) and transport to HPH_REF pins, Codec IC HPH_REF pipes from NMOS tube Q6 outflows
When pin detects voltage, the HS_L pins of itself are triggered, left and right acoustic channels L, R of HS_R pins and earphone interface are connected.Now,
Left and right sound channels are started working, and so as to form the loop of L channel, R channel, earth signal, MIC signals, current direction is such as Fig. 6
In heavy line shown in.
When the earphone for having national standard inserts earphone interface 33, that is, inserting the pin of the earphone of earphone interface input is：G/M
The flow direction of electric current is in pin, i.e. earphone：Ground is to MIC.Due to the DET ends of Codec IC HS_DET connection earphone interfaces, when
When having detected earphone insertion, Codec IC controls Mic_bias is upper electric, and voltage is from 0V liters on Codec IC Mic_in pins
To Vmic_in, Vmic_in gradually passes through R2 and C2 is charged in the process, and PMOS Q4 grid voltages slowly raise, and PMOS
The pipe Q4 source electrode rate of rise is faster than gate boost speed, so voltage rises to Vmic_in process from 0V on Mic_in pins
Middle PMOS Q4 is just begun to turn on, and its drain voltage starts to raise after PMOS Q4 is begun to turn on, when PMOS Q4 drain electrode electricity
After pressure reaches the cut-in voltage VGS (TH) of NMOS tube Q3, Q5, NMOS tube Q3, Q5 is begun to turn on, after NMOS tube Q5 is begun to turn on
PMOS Q4 grid voltage is begun to decline, so as to which PMOS Q4 is fully on, its drain voltage after PMOS Q4 is fully on
Rise, and then make NMOS tube Q3 fully on.
Meanwhile when on Mic_in pins voltage rise to Vmic_in during this from 0V, Vmic_in voltages gradually pass through R1
C1 is charged, PMOS Q1 grid voltages slowly raise, and the PMOS Q1 source electrode rate of rise is faster than gate boost speed, institute
With voltage on Mic_in pins from 0V rise to Vmic_in during PMOS Q1 just begin to turn on, therefore PMOS Q1 drain electrode
Voltage also begins to raise, but due to PMOS Q1 drain electrode connection be state's earphone G-signal (), therefore its drain voltage is drawn
Extremely in below 0.2V, and after R1 is fully charged to C1, PMOS Q1 source voltage terminals and grid voltage are about the same, therefore PMOS
Q1 ends.
Now, because NMOS tube Q3 is fully on and PMOS Q1 ends, current direction is as shown in the heavy line in Fig. 7.
Now, have voltage signal (reference voltage) and transport to HPH_REF pins, Codec IC HPH_REF pipes from NMOS tube Q3 outflows
When pin detects voltage, the HS_L pins of itself are triggered, left and right acoustic channels L, R of HS_R pins and earphone interface are connected.Now,
Left and right sound channels are started working, and so as to form the loop of L channel, R channel, earth signal, MIC signals, current direction is such as Fig. 8
In heavy line shown in.
It should be noted that need to ensure the unlatching electricity that earphone MIC cathode voltages Vmic is more than NMOS tube Q2, Q6 in type selecting
VGS (TH) is pressed, therefore NMOS tube Q2, Q3, Q4, Q5 should select VGS (TH) more suitable between 0.4~0.6V, and it leads completely
The pressure that is powered is as far as possible small.Same PMOS Q1, Q6 should select VGS (TH) more suitable between -0.6V to -0.4V, and its is complete
Conducting voltage is as far as possible small.
The earphone compatible circuit of the embodiment of the present invention, controlled by designing two current directions in parallel in the control module
Circuit, so that being American Standard or national standard regardless of the standard of the earphone of insertion earphone interface, there is voltage signal to export to MIC
The reference voltage end of module, so that left and right acoustic channels L, R of the HS_L pins of MIC modules, HS_R pins and earphone interface connect
It is logical, and then form L channel, R channel, earth signal, the loop of MIC signals, or formed L channel, R channel, MIC signals,
The loop of signal, the compatibility to different earphone standards is realized, lift Consumer's Experience.
It is understood that the earphone compatible circuit 300 of the embodiment of the present invention, can apply to mobile terminal, so that
American Standard earphone or national standard earphone can be matched by obtaining the mobile terminal.Certainly, the mobile terminal can also be with the earphone of various criterion
Form an electronic system.
It should be noted that herein, term " comprising ", "comprising" or its any other variant are intended to non-row
His property includes, so that process, method, article or device including a series of elements not only include those key elements, and
And also include the other element being not expressly set out, or also include for this process, method, article or device institute inherently
Key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that including this
Other identical element also be present in the process of key element, method, article or device.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on such understanding, technical scheme is substantially done to prior art in other words
Going out the part of contribution can be embodied in the form of software product, and the computer software product is stored in a storage medium
In (such as ROM/RAM, magnetic disc, CD), including some instructions to cause a station terminal equipment (can be mobile phone, computer, clothes
Be engaged in device, air conditioner, or network equipment etc.) perform method described in each embodiment of the present invention.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of earphone compatible circuit, it is characterised in that the compatible circuit includes：
MIC modules, control module and earphone interface；
The test side of the MIC modules is connected with the test side of the earphone interface, input and the control of the MIC modules
The input of molding block is connected, for when having detected that earphone inserts the earphone interface, electricity to be inputted to the control module
Press signal；
The control terminal of the control module is connected with the input of the earphone interface, the output end of the control module with it is described
The reference voltage end of MIC modules is connected, and the control module is used to, according to the voltage signal received, control described in flowing into
The current direction of earphone interface, and output reference voltage is to the MIC modules；
The MIC modules are additionally operable to when detecting the reference voltage, trigger the start-up operation of itself left and right sound channels.
2. earphone compatible circuit as claimed in claim 1, it is characterised in that the control module includes：
In parallel first flows to control circuit and second and flows to control circuit；Described first flows to the input of control circuit and institute
The second input for flowing to control circuit is stated to be connected；Described first flows to the control terminal of control circuit and second traffic organising
The control terminal of circuit is connected；Described first flows to the output end and the described second output end phase for flowing to control circuit of control circuit
Even；
When the MIC modules to the control module input the voltage signal when, described first flow to control circuit conducting and
Described second flow to control circuit cut-off, with control it is first-class to conducting and second flow direction end and export the reference voltage extremely
The MIC modules；Or described second flow to control circuit conducting and first flow to control circuit cut-off, to control second guide
Logical and the first flow direction cut-off, and the reference voltage is exported to the MIC modules.
3. earphone compatible circuit as claimed in claim 2, it is characterised in that it is described first flow direction the sense of current be from ground to
MIC；The sense of current of second flow direction is from MIC to ground.
4. earphone compatible circuit as claimed in claim 3, it is characterised in that described first, which flows to control circuit, includes：First
Resistance, the first electric capacity, the first PMOS, the first NMOS tube and the second NMOS tube；
Wherein, one end of the first resistor is as the described first input for flowing to control circuit, respectively with the MIC modules
Input, the source electrode of first PMOS be connected, the other end of the first resistor connects first electric capacity respectively
The drain electrode of one end, the grid of first PMOS and first NMOS tube, the other end ground connection of first electric capacity；
The grid of first PMOS connects the drain electrode of first NMOS tube, and the drain electrode of first PMOS connects simultaneously
The input of the grid of first NMOS tube, the grid of the second NMOS tube and the earphone interface；First NMOS tube
Source ground；
The grid of second NMOS tube connects the grid of first NMOS tube, the input of the earphone interface, and described the
The drain electrode of two NMOS tubes connects the input of the earphone interface；The source electrode of second NMOS tube is as the described first flow direction control
The output end of circuit processed, connect the reference voltage end of the MIC modules.
5. earphone compatible circuit as claimed in claim 3, it is characterised in that described second, which flows to control circuit, includes：Second
Resistance, the second electric capacity, the second PMOS, the 3rd NMOS tube and the 4th NMOS tube；
Wherein, one end of the second resistance is as the described second input for flowing to control circuit, respectively with the MIC modules
Input, the source electrode of second PMOS be connected, the other end of the second resistance connects second electric capacity respectively
The drain electrode of one end, the grid of second PMOS and the 3rd NMOS tube, the other end ground connection of second electric capacity；
The grid of second PMOS connects the drain electrode of the 3rd NMOS tube, and the drain electrode of second PMOS connects simultaneously
Grid, the grid of the 4th NMOS tube and the input of the earphone interface of 3rd NMOS tube；3rd NMOS tube
Source ground；
The grid of 4th NMOS tube connects the grid of the 3rd NMOS tube, the input of the earphone interface, and described the
The drain electrode of four NMOS tubes connects the input of the earphone interface；The source electrode of 4th NMOS tube is as the described first flow direction control
The output end of circuit processed, connect the reference voltage end of the MIC modules.
6. earphone compatible circuit as claimed in claim 1, it is characterised in that the MIC modules also include：L channel control terminal
With R channel control terminal；
The L channel control terminal is connected with the left channel interface of the earphone interface, and earphone described in the R channel control terminal connects
The left channel interface connection of mouth.
7. earphone compatible circuit as claimed in claim 1, it is characterised in that the MIC modules also include：Biased electrical pressure side,
And 3rd resistor；
One end of the 3rd resistor connects the biased electrical pressure side, and the other end connects the input of the MIC modules, Yi Jisuo
State the input of control module.
8. earphone compatible circuit as claimed in claim 6, it is characterised in that the MIC modules also include：4th resistance and
Five resistance；
One end of 4th resistance connects the left channel interface of the L channel control terminal and the earphone interface respectively, another
End ground connection；
One end of 5th resistance connects the right channel interface of the R channel control terminal and the earphone interface respectively, another
End ground connection.
9. a kind of mobile terminal, it is characterised in that including the earphone compatible circuit as described in claim 1 to 8.
10. a kind of electronic system, it is characterised in that including the mobile terminal and earphone described in claim 9.
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| CN201710727906.7A CN107396226B (en) | 2017-08-23 | 2017-08-23 | A kind of earphone compatible circuit, mobile terminal and electronic system |
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| CN201710727906.7A CN107396226B (en) | 2017-08-23 | 2017-08-23 | A kind of earphone compatible circuit, mobile terminal and electronic system |
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| Publication number | Publication date |
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| CN107396226B (en) | 2019-07-09 |
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