CN201349247Y - Earphone interface circuit and movable termination - Google Patents
Earphone interface circuit and movable termination Download PDFInfo
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- CN201349247Y CN201349247Y CNU2008201835978U CN200820183597U CN201349247Y CN 201349247 Y CN201349247 Y CN 201349247Y CN U2008201835978 U CNU2008201835978 U CN U2008201835978U CN 200820183597 U CN200820183597 U CN 200820183597U CN 201349247 Y CN201349247 Y CN 201349247Y
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Abstract
The utility model relates to an earphone interface circuit which comprises a CPU, a baseband chip, a grounding leaf spring, an L channel leaf spring, an R channel leaf spring, a microphone leaf spring, an earphone insertion detecting circuit, an earphone type detecting circuit, a microphone regulating circuit and an earphone signal switching circuit. When the earphone insertion detecting circuit detects the insertion of a four-section earphone, the CPU controls the earphone switching circuit, and makes an L channel or an R channel of the earphone output signals from the baseband chip. When the earphone type detecting circuit detects the insertion of a three-section earphone, the CPU controls the earphone signal switching circuit, and outputs L channel signals or R channel signals to the baseband chip through the microphone regulating circuit. The utility model also relates to a movable termination which comprises the earphone interface. Thereby, the utility model utilizes the characteristic that the earphone can be used as an MIC, and the mobile phone communication function of the earphone with a plug in a diameter of 3.5 mm is realized.
Description
Technical field
The utility model relates to the mobile communication terminal technical field, relates in particular to a kind of earphone interface circuit and portable terminal.
Background technology
The earphone interface of existing mobile phone is more with 2.5mm interface or own interface, and the 3.5mm interface also progressively occurs.The Ministry of Information industry has released " mobile phone wired earphone interfacing requires and method of testing (declaration original text) " in March, 2008, unify the interface of earphone, thereby realizes the earphone standardization of mobile phone products.But common 3.5mm interface earphone generally is not to be with microphone (MIC), just can not be directly used in conversation so in use, can only be used to listen to the music, the video sound accompaniment.
At present, the patent application document that name is called earphone interface circuit and has a mobile phone of described earphone interface circuit has proposed to have the earphone of microphone, this patent application document discloses a kind of earphone interface circuit, the earphone jack circuit that comprises the 3.5mm diameter, it has ground spring sheet, L channel spring leaf, R channel spring leaf, microphone spring leaf and detection springs sheet; Wherein, described ground spring sheet, L channel spring leaf and R channel spring leaf when the plug earphone inserts respectively with corresponding contact of corresponding contact of plug; Described microphone spring leaf and detection springs sheet contact with the ground contact of plug earphone when inserting the syllogic earphone, and contact with the microphone contact of plug earphone when inserting the four-part form earphone; The input port of the other end connection processing device of described detection springs sheet; With circuit that described microphone spring leaf is connected on be connected with on the voltage and draw branch road.The utility model simultaneously discloses a kind of mobile phone with described earphone interface circuit again, makes the earphone that mobile phone can compatible 3.5mm diameter plug, and has the function that the headset type that inserts is detected.This utility model is intended to solve the problem that mobile phone can't the compatible 3.5mm of use diameter plug earphone, and can instruct that handset-selected connection mobile phone Mike's send that words function or earphone Mike's send the words function.But this utility model earphone does not propose to utilize the loud speaker back wash effect to solve the conversation problem as microphone.
The utility model content
The utility model is in order to solve the plug earphone conversation problem of 3.5mm diameter, a kind of earphone interface circuit and portable terminal have been proposed, thereby loud speaker (SPK) back wash effect that utilizes earphone can be used as the characteristic of MIC, realizes the mobile phone communication function of common 3.5mm diameter plug earphone.
In order to address the above problem, the earphone interface circuit that the utility model provides, comprise baseband chip, ground spring sheet, L channel spring leaf, R channel spring leaf, microphone spring leaf, and have earphone and insert testing circuit and it is characterized in that, further comprise headset type testing circuit, microphone modulate circuit, earphone signal commutation circuit, when described headset type testing circuit detects the insertion of four-part form earphone, described CPU controls described earphone signal commutation circuit, with the signal of earphone L channel or R channel output from baseband chip; When described headset type testing circuit detected the insertion of syllogic earphone, described CPU controlled described earphone signal commutation circuit, and an earphone left side or right-channel signals are input to baseband chip through the microphone modulate circuit.
Described microphone modulate circuit comprises impedance adjustment circuit, and the microphone signal that the earphone speaker voice-grade channel is served as is adjusted, and the input impedance of its output impedance and baseband chip is complementary.
Described microphone modulate circuit further comprises audio amplifier circuit, links to each other with described L channel or right channel loudspeaker voice-grade channel, and the audio frequency that loud speaker is collected amplifies.
Described headset type testing circuit comprises a triode, and base stage links to each other with described microphone spring leaf, and microphone signal is inserted base stage by RC network filtering; Grounded emitter; Collector electrode is on the one hand by drawing on the divider resistance R4 and exporting the testing result signal to the earphone signal commutation circuit.
Described triode is a NPN type triode, and when described testing result signal was high level, expression syllogic earphone inserted; When the testing result signal was low level, expression four-part form earphone inserted.
In order to address the above problem, the utility model also provides a kind of portable terminal to comprise earphone interface circuit, comprise baseband chip, ground spring sheet, L channel spring leaf, R channel spring leaf, microphone spring leaf, and have earphone and insert testing circuit, further comprise headset type testing circuit, microphone modulate circuit, earphone signal commutation circuit, when described headset type testing circuit detects the four-part form earphone and inserts, with earphone L channel or R channel output signal from baseband chip; When an earphone left side or right-channel signals are input to baseband chip through the microphone modulate circuit.
Therefore, the utility model utilizes the SPK back wash effect of earphone to can be used as the characteristic of MIC, realizes the mobile phone communication function of common 3.5mm diameter plug earphone.During use, the earphone L channel still as loud speaker usefulness, and being taken down close mouth, is used as microphone by the loud speaker of R channel.
Description of drawings
Fig. 1 is the block diagram of a kind of earphone interface circuit of the utility model.
Fig. 2 is 4 sections schematic diagrames of 3.5mm diameter plug earphone.
Fig. 3 inserts testing circuit figure for earphone.
Fig. 4 is the circuit diagram of the utility model headset type testing circuit.
Fig. 5 is the circuit diagram of the utility model earphone signal commutation circuit and the combination of microphone modulate circuit.。
Fig. 6 is 3.5mm diameter 4 segmentation headset plug outline dimensional drawings.
Embodiment
As shown in Figure 1, block diagram for a kind of earphone interface circuit of the utility model, this earphone interface circuit is particularly useful for the plug earphone that diameter is 3.5mm, this earphone interface circuit comprises CPU 10 and baseband chip 20, grounding elastic part 11, L channel shell fragment 12, R channel shell fragment 13, microphone shell fragment 14, and have earphone and insert testing circuit 15, also comprise headset type testing circuit 16, microphone (MIC) modulate circuit 17, earphone signal commutation circuit 18, when described headset type testing circuit 16 detects four-part form earphone (as the four-part form earphone of 3.5mm diameter) insertion (when CPU detects the HF_TYPE signal indication low level of headset type testing circuit), CPU control earphone signal commutation circuit is with earphone L channel or the R channel output signal from baseband chip 20; When described headset type testing circuit 16 detects syllogic earphone (as 3.5mm diameter syllogic earphone) insertion (when CPU detects the HF_TYPE signal indication high level of headset type testing circuit), CPU control earphone signal commutation circuit is input to baseband chip 20 with an earphone left side or right-channel signals through microphone modulate circuit 17.There is shown at the utility model the earphone right-channel signals is used as microphone signal.
Operation principle of the present utility model is when earphone inserts earphone jack, the HANDER signal that earphone in the earphone interface circuit inserts testing circuit 15 is output as high level to CPU, and CPU switches to the audio signal of the baseband chip decoding loud speaker from mobile phone on the earphone according to this HANDER signal; And opposite when transfering to earphone, the HANDER signal is a low level, and CPU switches to the audio signal of baseband chip decoding the loud speaker of mobile phone from earphone according to this signal.Simultaneously, when inserting earphone, headset type testing circuit 16 output HF_TYPE signals are given CPU.Is earphone signal commutation circuit 18 by CPU according to this HF_TYPE signal controlling audio frequency simulation switch:
When the HF_TYPE signal is low level (promptly when inserting the four-part form earphone of 3.5mm diameter), export CPU to, CPU is a low level output R/M_SEL signal according to this HF_TYPE signal, the control audio analog switch, to link to each other with the R_MIC signal this moment from the right-channel signals CODEC_R signal of baseband chip, even the output of earphone R channel is from the CODEC_R signal of baseband chip.
When the HF_TYPE signal is high level (promptly when inserting the syllogic earphone), export CPU to, CPU is a high level according to this HF_TYPE signal, output R/M_SEL signal, the control audio analog switch, link to each other earphone R channel R_MIC signal this moment with the MIC_BACKUP signal that mails to baseband chip, promptly earphone R channel R_MIC signal is input to baseband chip 20 through the microphone modulate circuit.
At first referring to Fig. 2, be 4 sections schematic diagrames of 3.5mm diameter plug earphone, when adopting no MIC earphone, M and G are all ground connection.Because the position of the earphone of band MIC is the 3rd section of 4 sections plugs, the position is equal to the first half of the 3rd end of 3 end plugs, and this part is GND, thus, according to inserting the impedance difference of earphone at this point, the earphone that just can judge insertion is band MIC or is not with MIC.Earphone_L represents the earphone left channel signals, and Earphone_R represents the earphone right-channel signals.HF_MIC1 represents microphone signal.
Describe earphone in detail referring to Fig. 3,4 and 5 and insert testing circuit, headset type testing circuit, earphone signal commutation circuit and microphone modulate circuit.
As shown in Figure 3; for earphone inserts testing circuit figure; this circuit core partly is a NPN type triode Q2; its emitter-base bandgap grading 2 ground connection; collector electrode 3 connects and draws and export HANDER signal (to CPU) on the 100K resistance R 3; after carrying out emi protection from the left channel signals EARPHONE_L of earphone through the earphone signal filter of prior art, output EARPHONE_L_DET is drawn the back to insert the ground level of triode (enter before the base stage through RC network (as scheming to go up R7=10K and C6=1uf forms) and carry out filtering) on the 10K resistance R 5.Because the loud speaker of earphone itself has 32 ohm earth impedance, the variation that earphone inserts and insertion can not cause transistor base voltage, thereby cause triode by the end of between conducting state, switching, therefore the HANDER output level changes, and then causing that CPU carries out corresponding action, when for example inserting earphone, audio signal will switch on the earphone from mobile phone speaker, when earphone took out, audio signal is switchback again.
In this example, 32 Europe impedances of earphone L channel are the build-in attributes of earphone speaker, and are relevant with the coil of earphone the inside, use this attribute to insert the foundation of judging as earphone, do not influence the function of earphone pronunciation itself.At this, also can select R channel to be used as inserting basis for estimation.
Referring to Fig. 4, be the utility model headset type testing circuit figure, this circuit also is a NPN type triode, as shown in Figure 3, its emitter 2 ground connection, collector electrode 3 connects and draws and export HF_TYPE signal (to CPU) on the 1M resistance R 4, from the MIC signal (HF_MIC-) of earphone through RC network (R6=100K and C5=0.1uf) filtering and insert the ground level 1 of this triode.Because when inserting the earphone of syllogic and four-part form, the earth impedance difference of microphone signal HF_MIC-, for example HF_MIC-is direct ground connection when inserting the syllogic earphone, HF_MIC-arrives ground through the microphone internal resistance when inserting the four-part form earphone, will change at the voltage after drawing on microphone bias (MIC_BIAS) power supply, promptly cause the transistor base change in voltage, thereby cause triode by and conducting state between switch, therefore the HF_TYPE output level changes, and causes that CPU carries out corresponding action (the analog switch passage in the control earphone signal commutation circuit etc.).When described testing result signal HF_TYPE was high level, expression 3.5mm diameter syllogic earphone inserted; When the testing result signal was low level, expression 3.5mm diameter four-part form earphone inserted.Among the figure HF_MIC-be the microphone signal HF-MIC1 of earphone through after existing earphone signal filter carries out emi protection, the signal of output draws on the MIC_BIAS power supply again.
For example, when inserting 3.5mm diameter four-part form earphone (four-part form earphone as shown in Figure 6), four of earphone interface circuit shell fragments are connected with corresponding earphone contact in the utility model.Because left channel signals is through earphone 32 Europe loud speaker ground connection, thereby the EARPHONE_L_DET signal connect lowly, and earphone inserts detection transistor Q2 to be ended, and the HANDER signal is drawn to be high level, and then causes that CPU carries out corresponding actions.Simultaneously, because this moment, there was earth impedance in microphone signal HF_MIC-, this signal presents high level because of drawing on the MIC_BIAS power supply, the triode Q1 conducting of headset type testing circuit, the HF_TYPE signal that sends to CPU is a low level, CPU exports the R/M_SEL signal in view of the above, and the control analog switch makes the CODEC_R signal of earphone R channel output from baseband chip.As shown in Figure 5, R/M_SEL signal low level, with pin 3 and 4 conductings of U1, i.e. pin output R_MIC signal, wherein this R_MIC signal is output as the earphone right-channel signals after protecting through electromagnetic interference (EMI) through prior art earphone signal filter.
When inserting the syllogic earphone, the headset detection part is identical with the situation of above four-part form, but this moment, microphone signal was a low level, and the triode Q1 of headset type testing circuit ends, and the HF_TYPE signal becomes high level.In this case, needs according to the user, CPU output R/M_SEL signal controlling analog switch, when the user need use standby microphone, make the right-channel signals (right-channel signals of this earphone is to carry out the signal R_MIC that exports behind the emi protection through prior art earphone signal filter) of earphone be input to baseband chip through the MIC modulate circuit; When the user does not need to use standby microphone, make the CODEC_R signal of baseband chip be switched to earphone R channel (being same prior art).
Referring to Fig. 5, be the circuit diagram of the utility model earphone signal commutation circuit and the combination of microphone modulate circuit.In figure, U1 is the audio frequency simulation switch, when pin 6 is high level (CPU is a high level according to HF_TYPE signal high level output R/M_SEL), pin 1 and pin 4 conductings, the R_MIC signal is linked to each other with the MIC_BACKUP signal that mails to baseband chip, (wherein the R_MIC signal is the output behind the earphone right-channel signals process prior art earphone signal filter) promptly realized utilizing the loud speaker back wash effect, makes the R channel earphone serve as microphone and uses.When pin 6 is low level (CPU is according to HF_TYPE signal and user instruction control R/M_SEL output low level), pin 3 and pin 4 conductings, promptly under R/M_SEL signal controlling, the right-channel signals CODEC_R from baseband chip can be linked to each other with R_MIC from CPU.
Above-mentioned R_MIC signal links to each other with the MIC_BACKUP signal that mails to baseband chip also through using the MIC modulate circuit, as the U2 among Fig. 5, when selecting standby microphone channel (situation that the MIC_BACKUP signal links to each other with R_MIC), U2 plays impedance matching, signal amplifies and the effect of filtering.The MIC modulate circuit carries out impedance matching to the MIC signal (HF_M) from R channel and amplifies the back (as entering from 1 mouthful of U2 among the figure, 2 mouthfuls of outputs from U2), send in the voicefrequency circuit of baseband processor, processing such as in baseband processor, amplify again, so that the usefulness of real conversation.Because the impedance of earphone speaker is generally 32 ohm, the impedance of microphone is 2.2K, so will utilize the impedance adjustment circuit of microphone modulate circuit to adjust.The microphone modulate circuit just comprises the function of impedance matching, filtering and amplification.This earphone interface circuit also comprises the earphone signal filter in addition, and is identical with existing earphone signal filter circuit, and these two filters mainly are to carry out EMI and esd protection.
Microphone modulate circuit 17 comprises impedance adjustment circuit, and the microphone signal (HF_M) that the earphone speaker voice-grade channel is served as is adjusted, and the input impedance of its output impedance and baseband chip is complementary.Also have the audio frequency enlarging function, link to each other with described L channel or right channel loudspeaker voice-grade channel, the audio frequency that loud speaker is collected amplifies.Therefore, increased when making earphone speaker (as with the right channel loudspeaker voice-grade channel) as microphone behind the audio amplifier circuit 19, its sensitivity in-55dB ± 7dB scope, easy like this conversation of obtaining the user.Impedance adjustment circuit in the microphone modulate circuit 17 and audio amplifier circuit utilize the existing circuit that can play impedance adjustment and audio frequency amplification to get final product, and can use discrete component and amplifier to realize as the microphone modulate circuit.
Wherein can to adopt diameter be 4 sections plugs of 3.5mm to the plug earphone, its overall dimension as shown in Figure 6, the wide 0.15mm that is about of A among the figure, the no burr in B place, overlap.Number in the figure 1 expression plug tip, it be an electric conducting material, 2 are the insulation ring set, 3 be middle ring sleeve 1 its be electric conducting material, 4 is middle ring sleeve 2, it is an electric conducting material, 5 is plug end ring set, it is an electric conducting material, and 6 is plug end hand grip part.And the situation that is connected such as the following table of general mobile phone and multi-form earphone
The situation that is connected of table 1 mobile phone and multi-form earphone
Wherein, the earphone (comprising stereophone and mono headset) of band MIC can adopt existing traditional circuit, and does not adopt the earphone interface circuit that the utility model proposes with the stereophone of 3 terminal contacts of MIC.
Because general norm regulation plug all is that output is used as audio frequency for the 1st section, it is the L channel of stereophone, and generally the earphone cord of L channel is shorter than R channel, so this L channel still keeps former function, and the right channel loudspeaker voice-grade channel can only be switched to the microphone modulate circuit.Therefore, during use, the earphone L channel still as loud speaker usefulness, and being taken down close mouth, is used as microphone by the loud speaker of R channel.After wherein handling through earphone signal filter EMI with prior art is identical, be connected to the L channel of earphone interface circuit from the L channel earphone output signal of baseband chip.The utility model only uses as microphone for the exemplary loud speaker with R channel.Therefore the utility model utilizes loud speaker (SPK) back wash effect of earphone to can be used as the characteristic of MIC, realizes the mobile phone communication function of common 3.5mm diameter plug earphone.
Correspondingly, the utility model also provides a kind of portable terminal that comprises earphone interface circuit, comprise baseband chip, ground spring sheet, L channel spring leaf, R channel spring leaf, microphone spring leaf, earphone inserts testing circuit, further comprise headset type testing circuit, microphone modulate circuit, earphone signal commutation circuit, when described headset type testing circuit detects the insertion of four-part form earphone, described CPU controls described earphone signal commutation circuit, with the signal of earphone L channel or R channel output from baseband chip; When described headset type testing circuit detected the insertion of syllogic earphone, described CPU controlled described earphone signal commutation circuit, and an earphone left side or right-channel signals are input to baseband chip through the microphone modulate circuit.Wherein the earphone interface circuit that this portable terminal adopted is the interface circuit that is exclusively used in 3.5mm diameter plug earphone.And four-part form earphone or syllogic earphone are the plug earphone of 3.5mm diameter.
Described microphone modulate circuit comprises impedance adjustment circuit, and the microphone signal that the earphone speaker voice-grade channel is served as is adjusted, and the input impedance of its output impedance and baseband chip is complementary.
Described microphone modulate circuit comprises audio amplifier circuit, links to each other with described L channel or right channel loudspeaker voice-grade channel, and the audio signal that loud speaker is collected is amplified.
Described headset type testing circuit comprises a triode, and base stage links to each other with described microphone spring leaf, with microphone signal by RC network filtering and insert base stage; Grounded emitter; Collector electrode is by drawing on the divider resistance and exporting the testing result signal to frequency switch circuit.
Described triode is a NPN type triode, and when described testing result signal was high level, expression syllogic earphone inserted; When the testing result signal was low level, expression four-part form earphone inserted.
The utility model earphone interface circuit is compared with prior art, and microphone signal can be used for carrying out headset type and detects, and with differentiation syllogic or four-part form earphone, and this signal also can receive the audio frequency input of microphone; Right-channel signals can be switched between output of earphone right audio channel and the input of standby microphone; When right-channel signals switches to the input of standby microphone, will be through a microphone modulate circuit, this circuit inside comprises that microphone impedance matching, signal are amplified and the function of signal filtering, and these three functions are to possess the function that could realize standby microphone.
It should be noted last that, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the utility model, and not break away from the spirit and scope of technical solutions of the utility model and claim.
Claims (10)
1, a kind of earphone interface circuit, comprise CPU, baseband chip, ground spring sheet, L channel spring leaf, R channel spring leaf, microphone spring leaf, insert testing circuit with earphone, it is characterized in that, further comprise headset type testing circuit, microphone modulate circuit, earphone signal commutation circuit, when described headset type testing circuit detects the insertion of four-part form earphone, described CPU controls described earphone signal commutation circuit, with the signal of earphone L channel or R channel output from baseband chip; When described headset type testing circuit detected the insertion of syllogic earphone, described CPU controlled described earphone signal commutation circuit, and an earphone left side or right-channel signals are input to baseband chip through described microphone modulate circuit.
2, circuit as claimed in claim 1, it is characterized in that, described microphone modulate circuit comprises that the microphone signal that the earphone speaker voice-grade channel is served as adjusts, and makes the input impedance phase impedance for matching of its output impedance and described baseband chip adjust circuit.
3, circuit as claimed in claim 1, it is characterized in that, described microphone modulate circuit comprises the audio amplifier circuit that audio signal that described L channel or right channel loudspeaker are collected is amplified, and links to each other with described L channel or right channel loudspeaker voice-grade channel.
4, circuit as claimed in claim 1 is characterized in that, described headset type testing circuit comprises a triode, and base stage links to each other with described microphone spring leaf, with microphone signal by RC network filtering and insert base stage; Grounded emitter; Collector electrode is by drawing on the divider resistance and exporting the testing result signal to frequency switch circuit.
5, circuit as claimed in claim 4 is characterized in that, described triode is a NPN type triode, and when described testing result signal was high level, expression syllogic earphone inserted; When the testing result signal was low level, expression four-part form earphone inserted.
6, a kind of portable terminal, comprise earphone interface circuit, comprise baseband chip, ground spring sheet, L channel spring leaf, R channel spring leaf, microphone spring leaf, earphone inserts testing circuit, it is characterized in that, further comprise headset type testing circuit, microphone modulate circuit, earphone signal commutation circuit, when described headset type testing circuit detects the insertion of four-part form earphone, described CPU controls described earphone signal commutation circuit, with the signal of earphone L channel or R channel output from baseband chip; When described headset type testing circuit detected the insertion of syllogic earphone, described CPU controlled described earphone signal commutation circuit, and an earphone left side or right-channel signals are input to baseband chip through the microphone modulate circuit.
7, portable terminal as claimed in claim 6, it is characterized in that, described microphone modulate circuit comprises that the microphone signal that the earphone speaker voice-grade channel is served as adjusts, and makes the input impedance phase impedance for matching of its output impedance and baseband chip adjust circuit.
8, portable terminal as claimed in claim 6 is characterized in that, described microphone modulate circuit comprises the audio amplifier circuit that audio signal that loud speaker is collected is amplified, and links to each other with described L channel or right channel loudspeaker voice-grade channel.
9, portable terminal as claimed in claim 6 is characterized in that, described headset type testing circuit comprises a triode, and base stage links to each other with described microphone spring leaf, with microphone signal by RC network filtering and insert base stage; Grounded emitter; Collector electrode is by drawing on the divider resistance and exporting the testing result signal to frequency switch circuit.
10, portable terminal as claimed in claim 9 is characterized in that, described triode is a NPN type triode, and when described testing result signal was high level, expression syllogic earphone inserted; When the testing result signal was low level, expression four-part form earphone inserted.
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| CNU2008201835978U CN201349247Y (en) | 2008-12-22 | 2008-12-22 | Earphone interface circuit and movable termination |
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| CNU2008201835978U CN201349247Y (en) | 2008-12-22 | 2008-12-22 | Earphone interface circuit and movable termination |
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