CN101990144A - Double earphone adapter, main board and method for detecting double earphones - Google Patents

Double earphone adapter, main board and method for detecting double earphones Download PDF

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Publication number
CN101990144A
CN101990144A CN2009100129187A CN200910012918A CN101990144A CN 101990144 A CN101990144 A CN 101990144A CN 2009100129187 A CN2009100129187 A CN 2009100129187A CN 200910012918 A CN200910012918 A CN 200910012918A CN 101990144 A CN101990144 A CN 101990144A
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mic
pin
earphone
earth terminal
interface
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CN2009100129187A
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Chinese (zh)
Inventor
缪德超
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Shenyang Chenxun Simcom Technology Co Ltd
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Shenyang Chenxun Simcom Technology Co Ltd
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Priority to CN2009100129187A priority Critical patent/CN101990144A/en
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Abstract

The invention discloses a double earphone adapter, which comprises a MINI universal serial bus (USB) interface, a first earphone interface and a second earphone interface, wherein signals of each path in the adapter are short-circuited to antenna connecting pins of an FM (frequency modulation) chip through a plurality of capacitors. The invention also discloses a main board corresponding to the double earphone adapter, and a method for detecting double earphones by using the double earphone adapter and the main board. The invention provides the earphone adapter for the double earphones, so the earphones of two paths can be called at the same time; meanwhile, the function of FM signals is enhanced.

Description

The detection method of biphone adapter, mainboard and biphone
Technical field
The present invention relates to a kind of earphone adaptor, particularly a kind of combined type biphone adapter with the FM antenna, one with corresponding mainboard of this earphone adaptor and the detection method that adopts the biphone of this biphone adapter and this mainboard.
Background technology
Mainly have the interface type of two kinds of specifications at present on the earphone interface of mobile phone, a kind of is the 3.5mm earphone interface, and another kind is 10pin mini USB (the mini USB of 10 a pins) interface.Last type of earphone be at PC, and CD player is used extensivelyr on other music output equipment such as MP3, and history is longer.A kind of earphone interface in back is a direction of following handset audio interface.3.5mm earphone is divided into 3 segmentations again not with the earphone of MIC and the earphone of 4 segmentation band MIC.
Because 3.5mm earphone and 10pin mini USB earphone and deposit in the market, the 3.5mm earphone also can be applied on the earphone interface of 10pin mini USB for convenience, so a kind of device-earphone adaptor of interface conversion arises at the historic moment.Use earphone adaptor can reduce the waste of 3.5mm earphone, reduce link and pollute.
The adapter that uses mostly is man-to-man at present, just only corresponding independent interface.This adapter internal circuit is comparatively simple, only respective signal simply need be connected to get final product.This earphone can only a people be listened one tunnel sound channel when two people listen stereophone simultaneously, influence the effect of music.Simultaneously, the interface of one-to-many is also arranged at present, still, when 2 above earphones insert simultaneously, occur answering the problem that can not make a phone call when receiving calls, this is used in, and function is weak on the mobile phone.
Summary of the invention
The technical problem to be solved in the present invention is can not two people listen to stereosonic defective simultaneously in order to overcome prior art, provide a kind of biphone adapter, with corresponding mainboard of this biphone adapter and the detection method that adopts the biphone of this biphone adapter and this mainboard.
The present invention solves above-mentioned technical problem by following technical proposals:
A kind of biphone adapter, its characteristics are that it comprises:
One MINI USB interface, it comprises a MIC (microphone) pin, the 2nd MIC pin, L channel pin, R channel pin, first earth terminal and second earth terminal;
First earphone interface, it comprises L channel pin, R channel pin, MIC pin and earth terminal;
Second earphone interface, it comprises L channel pin, R channel pin, MIC pin and earth terminal;
Wherein the L channel pin of this MINI USB interface is electrically connected with the L channel pin of this first earphone interface, this second earphone interface respectively, and is connected with the earth terminal of this second earphone interface by one first electric capacity,
The R channel pin of this MINI USB interface is electrically connected with the R channel pin of this first earphone interface, this second earphone interface respectively, and is connected with the earth terminal of this second earphone interface by one second electric capacity,
First earth terminal of this MINI USB interface is electrically connected with the earth terminal of this first earphone interface and is connected to the earth terminal of this second earphone interface by one the 3rd electric capacity,
The 2nd MIC pin of this MINI USB interface is electrically connected with the MIC pin of this second earphone interface, and is connected to the earth terminal of this second earphone interface by one the 4th electric capacity,
The one MIC pin of this MINI USB interface is electrically connected with the MIC pin of this first earphone interface, and is connected to the earth terminal of this second earphone interface by one the 5th electric capacity,
Second earth terminal of this MINI USB interface is electrically connected with the earth terminal and the FM antenna of this second earphone interface respectively.
Preferably, the size of described first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity and the 5th electric capacity is 1nF.
The corresponding mainboard of a kind of and above-mentioned biphone adapter, its characteristics are, it comprises a baseband chip, one earphone inserts testing circuit, one MIC testing circuit, one analog switching circuit, an one FM chip and a MINI USB interface, this baseband chip comprises a MIC Enable Pin, the 2nd MIC Enable Pin, the L channel output, the R channel output, first headphone terminal and second headphone terminal and MIC pin, this MINI USB interface comprises a MIC pin, the 2nd MIC pin, the L channel pin, the R channel pin, first earth terminal and second earth terminal, wherein this second earth terminal links to each other with the FM antenna
Wherein, this baseband chip links to each other with this FM chip with this MIC testing circuit respectively, first headphone terminal of this baseband chip inserts testing circuit with second headphone terminal and this earphone and links to each other, the one MIC Enable Pin links to each other with this analog switching circuit with the 2nd MIC Enable Pin, the one MIC pin of this MINI USB interface links to each other with this analog switching circuit with this MIC testing circuit respectively with the 2nd MIC pin, the L channel pin of this MINI USB interface links to each other with the R channel output with the L channel output of this baseband chip respectively with the R channel pin, first earth terminal of this MINI USB interface inserts testing circuit with this earphone and links to each other, and second earth terminal of this MINI USB interface inserts testing circuit with this earphone respectively and links to each other with this FM chip.
Preferably, the capacitance of connecting between second earth terminal of this MINI USB interface and this FM (frequency modulation) chip.
Preferably, first earth terminal of this MINI USB interface and second earth terminal are respectively by a pair of ground magnetic bead ground connection.
Preferably, described earphone inserts testing circuit and comprises first headphone terminal, second headphone terminal and a divider resistance, this first headphone terminal is connected to first earth terminal of this MINI USB interface by one first diode, this second headphone terminal is connected to second earth terminal of this MINI USB interface by one second diode, the input of this divider resistance is connected to the detection power supply, and output is connected with second earth terminal with first earth terminal of this MINI USB interface respectively with one the 4th diode by one the 3rd diode.
Preferably, described MIC testing circuit comprises an analog switch, a MIC input, the 2nd MIC input, a MIC output and the 2nd MIC output, wherein a MIC input, the 2nd MIC input link to each other with two logic control ends of this analog switch respectively, the one MIC output, the 2nd MIC output link to each other with two outputs of this analog switch by a resistance respectively, and two first FPDP of this analog switch are connected to the MIC bias voltage by a divider resistance.
Preferably, described analog switching circuit comprises an analog switch, a MIC Enable Pin, the 2nd MIC Enable Pin, wherein a MIC Enable Pin, the 2nd MIC Enable Pin link to each other with two logic control ends of this analog switch respectively, and two first FPDP of this analog switch all are connected to the MIC pin of baseband chip.
A kind of biphone detection method that adopts aforesaid biphone adapter and mainboard, its characteristics are that it comprises following steps:
S 1: earphone inserts testing circuit and has judged whether that earphone inserts first earphone interface, if enter step S 2, if not, enter step S 3
S 2: the MIC testing circuit judges whether the earphone that inserts first earphone interface has MIC, if enable the MIC pin in this MINI USB interface; If not, close a MIC pin;
S 3: earphone inserts testing circuit and has judged whether that earphone inserts second earphone interface, if enter step S 4, if not, detection of end;
S 4: the MIC testing circuit judges whether the earphone that inserts second earphone interface has MIC, if enable the 2nd MIC pin in this MINI USB interface; If not, close the 2nd MIC pin.
Preferably, step S 1The determining step that testing circuit is gone in the middle ear machine transplanting of rice is:
S 11: judge whether first headphone terminal is high level, if first earphone interface has earphone to insert, and enters step S 2, if not, enter step S 3
Step S 3The determining step that testing circuit is gone in the middle ear machine transplanting of rice is:
S 31: judge whether second headphone terminal is high level, if second earphone interface has the earphone insertion to enter step S 4, if not, detection of end.
Preferably, step S 2Also comprise following steps:
S 21: the output of this analog switch links to each other with its first FPDP in the MIC testing circuit, judges whether a MIC output is high level, if enter step S 22, if not, the output of this analog switch is connected to its second FPDP, and enters step S 23
S 22: a MIC Enable Pin of this analog switching circuit is a high level, and the output of this analog switch is connected with first FPDP, promptly enables the MIC pin in the MINI USB interface;
S 23: a MIC Enable Pin of this analog switching circuit is a low level, and the output of this analog switch is connected with second FPDP, promptly closes the MIC pin in the MINI USB interface;
S 4Also comprise following steps:
S 41: the output of this analog switch links to each other with its first FPDP in the MIC testing circuit, judges whether the 2nd MIC output is high level, if enter step S 42, if not, the output of this analog switch is connected to its second FPDP, and enters step S 43
S 42: the 2nd MIC Enable Pin of this analog switching circuit is a high level, and the output of this analog switch is connected with first FPDP, promptly enables the MIC pin in the MINI USB interface;
S 43: the 2nd MIC Enable Pin of this analog switching circuit is a low level, and the output of this analog switch is connected with second FPDP, promptly closes the MIC pin in the MINI USB interface.
Positive progressive effect of the present invention is:
When 1, inserting two 4 segmentation earphones simultaneously, the MIC of two earphones can both operate as normal, and earphone can normally be listened to.
When 2, listening to FM broadcasting, signal can be by voice signal interference.
Description of drawings
Fig. 1 is the structure chart of biphone adapter of the present invention.
Fig. 2 is the structure principle chart of the present invention and the corresponding mainboard of biphone adapter.
Fig. 3 is that earphone inserts the testing circuit schematic diagram on the mainboard of the present invention.
Fig. 4 is a MIC testing circuit schematic diagram on the mainboard of the present invention.
Fig. 5 is an analog switching circuit schematic diagram on the mainboard of the present invention.
Fig. 6 is biphone adapter testing process figure of the present invention.
Fig. 7 detects and enables the flow chart of MIC for MIC of the present invention.
Embodiment
Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to describe technical scheme of the present invention in detail.
With reference to figure 1, be the structure chart of biphone adapter of the present invention.This biphone adapter comprises a MINI USB interface P3, be the mini USB interface of 10 pins, the present invention uses 6 pins, it is respectively: a MIC pin Mic1, the 2nd MIC pin Mic2, L channel pin MP3_L, R channel pin MP3_R, the first earth terminal P1_GND and the second earth terminal P2_GND, and the pin that other figure does not show is supported other purposes of prior art;
The first earphone interface P1 is the general earphone interface of 3.5mm, and it comprises L channel pin L, R channel pin R, MIC pin Mic1 and earth terminal GND;
The second earphone interface P2 is the general earphone interface of 3.5mm, and it comprises L channel pin L, R channel pin R, MIC pin Mic2 and earth terminal GND;
Wherein the L channel pin MP3_L of this MINI USB interface is electrically connected with the L channel pin L of this first earphone interface, this second earphone interface respectively, and is connected with the earth terminal of this second earphone interface by one first capacitor C 1,
The R channel pin MP3_R of this MINI USB interface is electrically connected with the R channel pin R of this first earphone interface, this second earphone interface respectively, and is connected with the earth terminal of this second earphone interface by one second capacitor C 2,
First earth terminal of this MINI USB interface is electrically connected with the earth terminal of this first earphone interface and is connected to the earth terminal of this second earphone interface by one the 3rd capacitor C 3,
The 2nd MIC pin of this MINI USB interface is electrically connected with the MIC pin of this second earphone interface, and is connected to the earth terminal of this second earphone interface by one the 4th capacitor C 4,
The one MIC pin of this MINI USB interface is electrically connected with the MIC pin of this first earphone interface, and be connected to the earth terminal of this second earphone interface by one the 5th capacitor C 5, described capacitor C 1-C5 is 1nF, because 1nF electric capacity is very big for the voice signal capacitive reactance of low frequency, and it is very little for the FM signal capacitive reactance of high frequency, do not influence the quality of voice signal so the signal strength signal intensity of FM can effectively be promoted
In addition, second earth terminal of this MINI USB interface is electrically connected with the earth terminal and the FM antenna of this second earphone interface respectively.
With reference to figure 2, be the structure principle chart of the present invention and the corresponding mainboard of biphone adapter.This mainboard comprises a BB baseband chip, one earphone inserts testing circuit, one MIC testing circuit, one analog switching circuit, an one FM chip and a MINI USB interface, this baseband chip comprises a MIC Enable Pin Mic1_EN, the 2nd MIC Enable Pin Mic2_EN, L channel output MP3_OUTL, R channel output MP3_OUTR, the first headphone terminal INT1_Headset and the second headphone terminal INT2_Headset and MIC pin Mic, this MINI USB interface comprises a MIC pin Mic1, the 2nd MIC pin Mic2, L channel pin MP3_L, R channel pin MP3_R, the first earth terminal P1_GND and the second earth terminal P2_GND, wherein this second earth terminal P2_GND links to each other with FM antenna FM_ANT
Wherein, this baseband chip links to each other with this FM chip with this MIC testing circuit respectively, first headphone terminal of this baseband chip inserts testing circuit with second headphone terminal and this earphone and links to each other, the one MIC Enable Pin links to each other with this analog switching circuit with the 2nd MIC Enable Pin, the one MIC pin of this MINI USB interface links to each other with this analog switching circuit with this MIC testing circuit respectively with the 2nd MIC pin, the L channel pin of this MINI USB interface links to each other with the R channel output with the L channel output of this baseband chip respectively with the R channel pin, first earth terminal of this MINI USB interface inserts testing circuit with this earphone and links to each other, and second earth terminal of this MINI USB interface inserts testing circuit with this earphone respectively and links to each other with this FM chip.
Wherein, the capacitance C that connects between second earth terminal of this MINI USB interface and this FM (frequency modulation) chip, the effect of capacitance enters the FM except preventing direct current signal, and the output impedance that also prevents FM influences earphone and inserts measuring ability.
Wherein, first earth terminal of this MINI USB interface and second earth terminal are respectively by a pair of ground magnetic bead (L1, L2) ground connection, the magnetic bead high-frequency signal high resistant over the ground that makes FM over the ground, and direct current signal shorted to earth insert and detect and do not influence the signal quality of FM thereby help earphone.
With reference to figure 3 is that earphone inserts the testing circuit schematic diagram on the mainboard of the present invention, described earphone inserts testing circuit and comprises the first headphone terminal INT1_Headset, the second headphone terminal INT2_Headset and a divider resistance R1, this first headphone terminal is connected to first earth terminal of this MINI USB interface by one first diode D1, this second headphone terminal is connected to second earth terminal of this MINI USB interface by one second diode D2, the input of this divider resistance is connected to and detects power vd D, output is connected with second earth terminal with first earth terminal of this MINI USB interface respectively with one the 4th diode D4 by one the 3rd diode D3, terminal part was not a high level when earphone inserted or extracts, when earphone inserts, the resistance R 1 of 100Kohm and the resistance to earth of earphone form dividing potential drop, make INT partly be low level, cause interrupt event to take place, promptly the behavior of once inserting earphone can be regarded as once and interrupt, the use of diode prevents that high-frequency signal is by the operation that leads to errors.
With reference to figure 4 is MIC testing circuit schematic diagram on the mainboard of the present invention, described MIC testing circuit comprises an analog switch, the one MIC input Mic1_AEn, the 2nd MIC input Mic2_AEn, the one MIC output Mic1_ADC and the 2nd MIC output Mic2_ADC, a MIC input wherein, the 2nd MIC input respectively with two logic control end A3 of this analog switch, C3 links to each other, the one MIC output, the 2nd MIC output is respectively by a resistance R 3, two output terminals A 2 of R4 and this analog switch, C2 links to each other, two first FPDP A4 of this analog switch, C4 is connected to MIC bias voltage MICBIASP by a divider resistance R2.
With reference to figure 5 is analog switching circuit schematic diagram on the mainboard of the present invention, described analog switching circuit comprises an analog switch, a MIC Enable Pin Mic1_En, the 2nd MIC Enable Pin Mic2_En, wherein a MIC Enable Pin, the 2nd MIC Enable Pin link to each other with two logic control end A3, C3 of this analog switch respectively, and two first FPDP A4, C4 of this analog switch all are connected to the MIC pin Mic of baseband chip.
With reference to figure 6 is biphone adapter testing process figure of the present invention.
Step 100, flow process begins.
Step 101 judges whether P1 interrupts, and promptly whether first earphone interface has earphone to insert, if, enter step 102, if not, enter step 103.
Step 102 is moved a MIC trace routine, detects whether the earphone that is inserted is 4 segmentation earphones, and promptly whether the earphone that is inserted has MIC.
Step 103 judges whether P2 interrupts, and promptly whether earphone inserts second earphone interface, if, enter step 104, if not, enter step 105, promptly enter other Interrupt Process.
Step 104 is moved the 2nd MIC trace routine, detects whether the earphone that is inserted is 4 segmentation earphones, and promptly whether the earphone that is inserted has MIC.
Step 105 enters other Interrupt Process.
Step 106 judges whether first earphone has MIC, if, enter step 107, if not, enter step 108.
Step 107 is enabled a MIC pin, and this moment, MIC normally moved.
Step 108 is closed a MIC pin, and do not have MIC and can use this moment.
Step 109 judges whether second earphone has MIC, if, enter step 110, if not, enter step 111.
Step 110 is enabled the 2nd MIC pin, and this moment, MIC normally moved.
Step 111 is closed the 2nd MIC pin, and do not have MIC and can use this moment.
Step 112, EOI.
With reference to figure 7,,, describe the process of using the biphone adapter in detail in conjunction with Fig. 3, Fig. 4 and Fig. 5 for the flow chart that MIC of the present invention detected and enabled MIC.
Step 200, flow process begins.
Step 201, the output terminals A 2 of this analog switch links to each other with its first FPDP A4 in the MIC testing circuit, MIC bias voltage MICBIASP is 3.3V, resistance R 2 is 2.2Kohm, this moment is if the earphone that inserts is 4 segmentation earphones, because the output of the dividing potential drop analog switch of MIC resistance can detect the above voltage of 0.8V in the 4 segmentation earphones, promptly MIC_ADC is a high level; If the earphone that inserts is 3 segmentation earphones, owing to there is not MIC resistance to carry out dividing potential drop, then MIC_ADC is a low level.
Step 202 judges whether output Mic1_ADC is high level, if, then enter step 203, if not, enter step 204.
Step 203, the earphone that is inserted are 4 segmentation earphones, promptly have MIC, and this moment, the Enable Pin of analog switching circuit obtained a high level signal, and promptly the output terminals A 2 of analog switch is connected with the first FPDP A4, enters step 205.
Step 204, the earphone that is inserted are 3 segmentation earphones, promptly do not have MIC, and this moment, the Enable Pin of analog switching circuit obtained a low level signal.
Step 205 is opened the MIC pin, at this moment the MIC operate as normal.
Step 206, the output terminals A 2 of analog switch is connected with the second FPDP A1, and promptly analog switch disconnects.
Step 207 is closed the MIC pin, and no MIC can use.
Adapter of the present invention is supported following function:
When inserting two 4 segmentation earphones simultaneously, can guarantee that the MIC of two earphones can both operate as normal, earphone can normally be answered; When inserting one 3 segmentation earphone and one 4 segmentation earphone simultaneously, 3 segmentation earphones and 4 segmentation earphones can both normally be answered, at this moment the MIC of 4 segmentation earphones energy operate as normal; When inserting separately one 3 segmentation earphone or 4 segmentation earphones, 3 segmentation earphones can normally be answered, and 4 segmentation earphones are except that normally answering, and its MIC can operate as normal; The above insertion can be selected arbitrarily at two earphone interfaces of P1, P2, can not influence the function of earphone.
Mainboard of the present invention is supported the earphone of corresponding 10 pin MINI USB interface under the situation of not using this biphone adapter.
Though more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, under the prerequisite that does not deviate from principle of the present invention and essence, can make numerous variations or modification to these execution modes.Therefore, protection scope of the present invention is limited by appended claims.

Claims (10)

1. biphone adapter is characterized in that it comprises:
One MINI USB interface, it comprises a MIC pin, the 2nd MIC pin, L channel pin, R channel pin, first earth terminal and second earth terminal;
First earphone interface, it comprises L channel pin, R channel pin, MIC pin and earth terminal;
Second earphone interface, it comprises L channel pin, R channel pin, MIC pin and earth terminal;
Wherein the L channel pin of this MINI USB interface is electrically connected with the L channel pin of this first earphone interface, this second earphone interface respectively, and is connected with the earth terminal of this second earphone interface by one first electric capacity,
The R channel pin of this MINI USB interface is electrically connected with the R channel pin of this first earphone interface, this second earphone interface respectively, and is connected with the earth terminal of this second earphone interface by one second electric capacity,
First earth terminal of this MINI USB interface is electrically connected with the earth terminal of this first earphone interface and is connected to the earth terminal of this second earphone interface by one the 3rd electric capacity,
The 2nd MIC pin of this MINI USB interface is electrically connected with the MIC pin of this second earphone interface, and is connected to the earth terminal of this second earphone interface by one the 4th electric capacity,
The one MIC pin of this MINI USB interface is electrically connected with the MIC pin of this first earphone interface, and is connected to the earth terminal of this second earphone interface by one the 5th electric capacity,
Second earth terminal of this MINI USB interface is electrically connected with the earth terminal and the FM antenna of this second earphone interface respectively.
2. biphone adapter as claimed in claim 1 is characterized in that, the size of described first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity and the 5th electric capacity is 1nF.
One kind with the corresponding mainboard of the described biphone adapter of claim 1, it is characterized in that, it comprises a baseband chip, one earphone inserts testing circuit, one MIC testing circuit, one analog switching circuit, an one FM chip and a MINI USB interface, this baseband chip comprises a MIC Enable Pin, the 2nd MIC Enable Pin, the L channel output, the R channel output, first headphone terminal and second headphone terminal and MIC pin, this MINI USB interface comprises a MIC pin, the 2nd MIC pin, the L channel pin, the R channel pin, first earth terminal and second earth terminal, wherein this second earth terminal links to each other with the FM antenna
Wherein, this baseband chip links to each other with this FM chip with this MIC testing circuit respectively, first headphone terminal of this baseband chip inserts testing circuit with second headphone terminal and this earphone and links to each other, the one MIC Enable Pin links to each other with this analog switching circuit with the 2nd MIC Enable Pin, the one MIC pin of this MINI USB interface links to each other with this analog switching circuit with this MIC testing circuit respectively with the 2nd MIC pin, the L channel pin of this MINI USB interface links to each other with the R channel output with the L channel output of this baseband chip respectively with the R channel pin, first earth terminal of this MINI USB interface inserts testing circuit with this earphone and links to each other, and second earth terminal of this MINI USB interface inserts testing circuit with this earphone respectively and links to each other with this FM chip.
4. mainboard as claimed in claim 3 is characterized in that, the capacitance of connecting between second earth terminal of this MINI USB interface and this FM chip.
5. as claim 3 or 4 described mainboards, it is characterized in that first earth terminal of this MINI USB interface and second earth terminal are respectively by a pair of ground magnetic bead ground connection.
6. mainboard as claimed in claim 3, it is characterized in that, described earphone inserts testing circuit and comprises first headphone terminal, second headphone terminal and a divider resistance, this first headphone terminal is connected to first earth terminal of this MINI USB interface by one first diode, this second headphone terminal is connected to second earth terminal of this MINI USB interface by one second diode, the input of this divider resistance is connected to the detection power supply, and output is connected with second earth terminal with first earth terminal of this MINI USB interface respectively with one the 4th diode by one the 3rd diode.
7. mainboard as claimed in claim 3, it is characterized in that, described MIC testing circuit comprises an analog switch, a MIC input, the 2nd MIC input, a MIC output and the 2nd MIC output, wherein a MIC input, the 2nd MIC input link to each other with two logic control ends of this analog switch respectively, the one MIC output, the 2nd MIC output link to each other with two outputs of this analog switch by a resistance respectively, and two first FPDP of this analog switch are connected to the MIC bias voltage by a divider resistance.
8. mainboard as claimed in claim 3, it is characterized in that, described analog switching circuit comprises an analog switch, a MIC Enable Pin, the 2nd MIC Enable Pin, wherein a MIC Enable Pin, the 2nd MIC Enable Pin link to each other with two logic control ends of this analog switch respectively, and two first FPDP of this analog switch all are connected to the MIC pin of baseband chip.
9. biphone detection method that adopts biphone adapter as claimed in claim 1 and mainboard as claimed in claim 3 is characterized in that it comprises following steps:
S 1: earphone inserts testing circuit and has judged whether that earphone inserts first earphone interface, if enter step S 2, if not, enter step S 3
S 2: the MIC testing circuit judges whether the earphone that inserts first earphone interface has MIC, if enable the MIC pin in this MINI USB interface; If not, close a MIC pin;
S 3: earphone inserts testing circuit and has judged whether that earphone inserts second earphone interface, if enter step S 4, if not, detection of end;
S 4: the MIC testing circuit judges whether the earphone that inserts second earphone interface has MIC, if enable the 2nd MIC pin in this MINI USB interface; If not, close the 2nd MIC pin.
10. biphone detection method as claimed in claim 9 is characterized in that step S 2Also comprise following steps:
S 21: the output of this analog switch links to each other with its first FPDP in the MIC testing circuit, judges whether a MIC output is high level, if enter step S 22, if not, the output of this analog switch is connected to its second FPDP, and enters step S 23
S 22: a MIC Enable Pin of this analog switching circuit is a high level, and the output of this analog switch is connected with first FPDP, promptly enables the MIC pin in the MINI USB interface;
S 23: a MIC Enable Pin of this analog switching circuit is a low level, and the output of this analog switch is connected with second FPDP, promptly closes the MIC pin in the MINI USB interface.
CN2009100129187A 2009-07-31 2009-07-31 Double earphone adapter, main board and method for detecting double earphones Pending CN101990144A (en)

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CN110460949A (en) * 2019-08-20 2019-11-15 东莞市逸音电子科技有限公司 A kind of production of earphone and detection method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103379401A (en) * 2012-04-25 2013-10-30 国基电子（上海）有限公司 Power supply system supplying power through headset connecting port, electronic device and headset power line
CN103379401B (en) * 2012-04-25 2016-06-08 国基电子（上海）有限公司 Power supply system, electronic installation and the earphone supply lead powered by earphone interface
CN103974157A (en) * 2013-01-30 2014-08-06 国基电子（上海）有限公司 Electronic device and earphone power line powered via earphone interface
CN103974157B (en) * 2013-01-30 2018-09-28 国基电子（上海）有限公司 The electronic device and earphone power cord powered by earphone interface
CN104105034A (en) * 2013-04-03 2014-10-15 宝德科技股份有限公司 Earphone device and control method
CN104254027A (en) * 2013-08-05 2014-12-31 广东欧珀移动通信有限公司 Earphone using method and system compatible with circular interface and USB (universal serial bus) interface
CN103442317A (en) * 2013-08-26 2013-12-11 深圳市文鼎创数据科技有限公司 Audio port identification circuit, audio port identification method and communication device
CN104936055A (en) * 2015-04-30 2015-09-23 上海锐鸿通信技术有限公司 Terminal with earphone interface and earphone interface adaptive method
CN108064347A (en) * 2017-11-28 2018-05-22 福建联迪商用设备有限公司 The audio pin test method and test device of communication module
CN110460949A (en) * 2019-08-20 2019-11-15 东莞市逸音电子科技有限公司 A kind of production of earphone and detection method

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Application publication date: 20110323