CN101287202A - Earphone detecting method for mobile terminal - Google Patents
Earphone detecting method for mobile terminal Download PDFInfo
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- CN101287202A CN101287202A CNA2008100386482A CN200810038648A CN101287202A CN 101287202 A CN101287202 A CN 101287202A CN A2008100386482 A CNA2008100386482 A CN A2008100386482A CN 200810038648 A CN200810038648 A CN 200810038648A CN 101287202 A CN101287202 A CN 101287202A
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Abstract
The invention provides a method for detecting an earphone of a mobile terminal, which essentially comprises that: if the HEADSET_DETECT' of the detection circuit of an earphone interface end is low, Spreadtrum CPU detection shows that the earphone is inserted; if the HEADSET_DETECT' is high, the Spreadtrum CPU detection shows that the earphone is extracted; the HP_SENSE of an earphone insertion and extraction detection circuit at an audio power amplifier end is grounded; when the HP_LOGIC is high, the detection of an audio power amplifier shows that the earphone is inserted, when the HP_LOGIC is low, the detection of the audio power amplifier shows that the earphone is extracted; the detection circuit of a conversation button of the earphone is provided with a bleeder circuit to ensure the reliability of conversation. The application method and the circuits of the invention realizes the detection of an earphone with a stereo audio power amplifier based on a Spreadtrum platform mobile terminal and solves the problem of improper hang-up owing to a puff on the mike of the earphone during conversation.
Description
Technical field
The present invention relates to a kind of headset detection method of portable terminal, be specifically related to the headset detection method of a kind of band stereo audio power amplifier (containing earphone 3D audio) based on the portable terminal of spreadtrum platform.
Background technology
For example in the use of mobile phone, earphone identification is mainly reflected in two functions: music and conversation at portable terminal.
Along with the development of personal mobile communication technology, multimedia technology has also obtained significant progress, and audio frequency occupies critical role in multimedia, and stereo audio and even 3D then are the important embodiment of good audio frequency around audio.But because the integrally-built restriction of mobile phone, mobile phone is put the stereo effect that is difficult to obtain the picture home audio outward, we can say that people's ear is difficult to distinguish.And the earphone stereophonic effect clearly, and present cell phone platform such as spreadtrum platform just have reasonable support to earphone is stereo, as long as plug in the earphone, platform can detect a low level, is transformed into the earphone output audio.NXP and Siliconlab platform are realized headset detection by ADC, and it is the bias voltage (about 2V) of earphone MIC that earphone inserts preceding ADC detected, after the insertion, and detected voltage step-down (about 1V).
3D is the once leap of stereo development around audio, and SN4188 (with the LM4988 compatibility) just supports earphone 3D audio.For this reason, as long as just can recognize the earphone insertion as long as the respective pin of the SN4188 that plugs in the earphone detects a suitable level, and the output earpiece audio.The headset detection principle of the stereo audio power amplifier of other support earphones 3D audio is roughly the same, and as LM49270, the HPS pin is the not insertion of low explanation earphone, and the HPS pin is that height illustrates that then earphone inserts.
But it is different that the earphone of spreadtrum platform and the headset detection pin of stereo audio power amplifier SN4188 inserts the voltage range that detects level, and this has just increased the complexity of headset detection.In addition, in the earphone conversation of spreadtrum platform, also often cause the mistake of conversation to hang up to earphone Mike air blowing.
Summary of the invention
The objective of the invention is to improve the headset detection method based on spreadtrum platform portable terminal of present band stereo audio power amplifier (SN4188, LM4888 etc.), solve the mistake of in the present earphone conversation earphone Mike being blown simultaneously and hang up problem, a kind of headset detection method of portable terminal is provided.
The invention provides a kind of headset detection method of portable terminal, be used to detect with the mobile terminal earphone of stereo audio power amplifier (containing earphone 3D audio) based on the spreadtrum platform, comprise the conversation of music and earphone, its detection method mainly comprises: if the HEADSET_DETECT ' of earphone interface end testing circuit is for low, spreadtrum CPU detects and is the earphone insertion, if HEADSET_DETECT ' is high, spreadtrum CPU detection is extracted for earphone; With the HP_SENSE ground connection of audio frequency power amplifier end earphone plug testing circuit, when HP_LOGIC be high, audio frequency power amplifier detects and is the earphone insertion, and when HP_LOGIC is low, the audio frequency power amplifier detection is extracted for earphone; Earphone conversation button by testing circuit in be provided with bleeder circuit to guarantee the reliability of conversation.
Application process of the present invention and circuit have been realized the headset detection based on spreadtrum platform portable terminal of band stereo audio power amplifier (SN4188, LM4888 etc.), have solved the mistake of in the earphone conversation earphone Mike being blown and have hung up problem.Headset detection circuit with existing spreadtrum platform portable terminal is compared, and the headset detection method of a kind of portable terminal provided by the invention has following beneficial effect:
The first, the present invention can solve the headset detection problem of all platforms of spreadtrum easily;
The second, the present invention is adapted to the application of stereo audio power amplifier (SN4188, LM4888 etc.) on the spreadtrum platform with earphone 3D audio;
Three, the present invention has also solved the problem that the conversation of spreadtrum platform earphone is blown and caused mistake to hang up Mike simultaneously.
Below, describe the details and the working condition that propose method and circuit according to the present invention in conjunction with the accompanying drawings and embodiments in detail.
Description of drawings
Fig. 1 is an audio frequency power amplifier end earphone plug testing circuit;
Fig. 2 is the testing circuit of earphone interface end;
Fig. 3 is earphone and interface circuit sketch thereof;
The testing circuit that Fig. 4 presses for earphone conversation button.
Embodiment
The invention provides a kind of headset detection method of portable terminal, be used to detect with the mobile terminal earphone of stereo audio power amplifier (containing earphone 3D audio) based on the spreadtrum platform, described detection method mainly comprises: if the HEADSET_DETECT ' of earphone interface end testing circuit is for low, spreadtrum CPU detects and is the earphone insertion, if HEADSET_DETECT ' is high, spreadtrum CPU detection is extracted for earphone; With the HP_SENSE ground connection of audio frequency power amplifier end earphone plug testing circuit, when HPvLOGIC be high, audio frequency power amplifier detects and is the earphone insertion, and when HP_LOGIC is low, the audio frequency power amplifier detection is extracted for earphone; Earphone conversation button by testing circuit in be provided with bleeder circuit to guarantee the reliability of conversation.
The headset detection of the embodiment of the invention is mainly used in following two kinds of occasions: music and earphone conversation.
During music, in the effective operating voltage range of portable terminal, require spreadtrum platform CPU and audio frequency power amplifier can both detect earphone exactly, headset detection circuit such as Fig. 1, Fig. 2, shown in Figure 3.
When earphone does not insert, HEADSETvDETECT ' discord the earphone of mobile phone end earphone interface links to each other, headset detection signal HEADSET_DETECT from spreadtrum platform CPU moves VMEM on R30 and R77, be high level (as shown in Figure 2), judges that thus earphone does not insert.
When earphone inserts, as shown in Figure 2, the HEADSET_DETECT ' of mobile phone end earphone interface can receive the ground (as shown in Figure 3) of earphone end, resistance R 77=1k Ω＜＜R30=100k Ω, spreadtrum platform CPU can detect a low level (as shown in Figure 2) from HEADSET_DETECT, judges that thus earphone inserts.
The headset detection of audio frequency power amplifier is finished by two detection signals, as shown in Figure 1.Table 1 has reflected two kinds of detection methods that audio frequency power amplifier SN4188 earphone inserts.
Table 1SN4188 operating state
| Audio frequency power amplifier enables pin | The HP_LOGIC pin | The HP_SENSE pin | The audio frequency power amplifier operating state |
| With | With | — | Single-ended |
| With | Low | Low (earphone does not insert) | Bridge-type/BTL |
| With | — | High (earphone insertion) | Single-ended |
| Low | — | — | Turn-off |
Method 1:HP_LOGIC ground connection, HP_SENSE is high, earphone inserts; HP_SENSE is low, and earphone is extracted;
Method 2:HP_SENSE ground connection, HP_LOGIC is high, earphone inserts; HP_LOGIC is low, and earphone is extracted.
The voltage range such as the following table of the high-low level correspondence of HP_LOGIC and HP_SENSE:
The voltage range of HP_SENSE and HPvLOGIC high-low level under the table 2 3V operating voltage
| Parameter | Representative value | Limiting value | Unit | |
| VIH | The HP_SENSE height | 1.9 | V | |
| VIL | HP_SENSE is low | 1.7 | V | |
| VIHSD | The HP_LOGIC height | 0.9 | 1.1 | V(min) |
| VILSD | HP_LOGIC is low | 0.6 | 0.4 | V(max) |
The voltage range of HP_SENSE and HP_LOGIC high-low level under the table 3 5V operating voltage
| Parameter | Representative value | Limiting value | Unit | |
| VIH | The HP_SENSE height | 3.3 | 4.0 | V(min) |
| VIL | HP_SENSE is low | 3.2 | 2.8 | V(max) |
| VIHSD | The HP_LOGIC height | 1.1 | 1.4 | V(min) |
| VILSD | HP_LOGIC is low | 1 | 0.4 | V(max) |
Our system of selection 2 herein realizes the headset detection of audio frequency power amplifier, as shown in Figure 1, HP_SENSE ground connection, whether the detection earphone inserts key is that detection HP_LOGIC is high or low.As long as HP_LOGIC is lower than 0.4V, detects to earphone and do not insert.As shown in Figure 2, when earphone did not insert, HEADSET_DETECT was high, and PNP triode T3 ends, and HP_LOGIC is by resistance R 172 and R174 ground connection, and voltage is almost 0＜0.4V, does not insert so audio frequency power amplifier detects earphone.Need only HP_LOGIC and be higher than 1.4V, detecting is that earphone inserts.As shown in Figure 2, when earphone did not insert, HEADSET_DETECT was low, PNP triode T3 conducting, HP_LOGIC meets VMEM by resistance R 171, R171=2k Ω＜＜R172=100k Ω, the HP_LOGIC magnitude of voltage approaches VMEM, promptly about 3V, inserts so audio frequency power amplifier detects earphone.
If employing method 1 realizes headset detection, this moment, HP_LOGIC needed ground connection, from table 2, table 3, mainly was to judge the height of HP_SENSE and low.The high and low level voltage scope of HP_SENSE when operating voltage is respectively 3V and 5V, it is bigger that the high and low level voltage scope of HP_SENSE is influenced by the PA supply voltage, HP_SENSE high level scope is greater than 1.9V during the 3V operating voltage, and HP_SENSE high level scope is greater than 4V during the 5V operating voltage.The operating voltage of portable terminal is to the maximum about 4.2V, and HP_SENSE high level scope at this moment is approximately greater than 3V.As shown in Figure 2, spreadtrum platform VMEM is approximately 3.1V, and the high level voltage scope of this and HP_SENSE is very nearly the same, is easy to cause erroneous judgement, so system of selection 2 safety relatively.
If HEADSET DETECT ' is low, spreadtrum CPU detects and is the earphone insertion in the headset detection circuit of the present invention; If HEADSET_DETECT ' is high, spreadtrum CPU detection is extracted for earphone.With HP_SENSE ground connection, when HPvLOGIC is high, audio frequency power amplifier detects and is the earphone insertion; When HP_LOGIC is low, audio frequency power amplifier detects to earphone and extracts.For other platforms, as NXP, Siliconlab etc., the method for different platform CPU headset detection may be different, but headset detection method the present invention of stereo audio power amplifier still adapts to.
In earphone when conversation,, when button is pressed, as shown in Figure 4, HEAD_MIC receives the ground of earphone end, triode T1 conducting, and BUTTON_DET is by high step-down, and button is pressed and is surpassed sometime, concludes to answer or hang up the telephone.R119 less if (for example 100K Ω), normal talking may be no problem, but, if earphone Mike is blown, analog signal trough (the 0.2V-0.3V that produces, approach 0) and the T1 base stage between pressure reduction be enough to make the T1 conducting, BUTTON_DET can detect a low level thus, and then may cause phone mistake to be hung up.Earphone conversation button of the present invention is pressed testing circuit, is provided with suitable bleeder circuit to guarantee the reliability of conversation, and R120 is 45k Ω-55k Ω left and right sides resistance in the dividing potential drop road, R119 115-125k Ω left and right sides resistance.Preferred R120 is 47k Ω or 51k Ω, and R119 is a 120k Ω left and right sides resistance.
In sum, the headset detection method of a kind of portable terminal provided by the invention has realized the application of stereo audio power amplifier on the spreadtrum platform of band earphone 3D audio well, and has solved the problem of when spreadtrum platform earphone is conversed Mike being blown and hanging up by mistake.
Claims (5)
1, a kind of headset detection method of portable terminal, be used to detect with the mobile terminal earphone of stereo audio power amplifier (containing earphone 3D audio) based on the spreadtrum platform, comprise the conversation of music and earphone, it is characterized in that described detection method mainly comprises: if the HEADSET_DETECT ' of earphone interface end testing circuit is for low, spreadtrum CPU detects and is the earphone insertion, if HEADSET_DETECT ' is high, spreadtrum CPU detection is extracted for earphone; With the HP_SENSE ground connection of audio frequency power amplifier end earphone plug testing circuit, when HP_LOGIC be high, audio frequency power amplifier detects and is the earphone insertion, and when HP_LOGIC is low, the audio frequency power amplifier detection is extracted for earphone; Earphone conversation button by testing circuit in be provided with bleeder circuit to guarantee the reliability of conversation.
2, the headset detection method of a kind of portable terminal according to claim 1, when it is characterized in that earphone does not insert, the HEADSET_DETECT discord earphone of mobile phone end earphone interface links to each other, headset detection signal HEADSET_DETECT from spreadtrum platform CPU moves VMEM on R30 and R77, be high level, judge that thus earphone does not insert; When earphone inserted, the HEADSET_DETECT ' of mobile phone end earphone interface can receive the ground of earphone end, resistance R 77=1k Ω＜＜R30=100k Ω, spreadtrum platform CPU can detect a low level from HEADSET_DETECT, judges that thus earphone inserts.
3, the headset detection method of a kind of portable terminal according to claim 1 is characterized in that HP_SENSE ground connection, as long as HP_LOGIC is lower than 0.4V, detects to earphone and does not insert; When earphone did not insert, HEADSET_DETECT was high, and PNP triode T3 ends, and HP_LOGIC is by resistance R 172 and R174 ground connection, and voltage is almost 0＜0.4V, does not insert so audio frequency power amplifier detects earphone; As long as HP_LOGIC is higher than 1.4V, detect and be the earphone insertion, when earphone does not insert, HEADSET_DETECT is low, PNP triode T3 conducting, and HP_LOGIC meets VMEM by resistance R 171, R171=2k Ω＜＜R172=100k Ω, the HP_LOGIC magnitude of voltage approaches VMEM, promptly about 3V, inserts so audio frequency power amplifier detects earphone.
4, the headset detection method of a kind of portable terminal according to claim 1, when it is characterized in that the earphone conversation, when button is pressed, earphone conversation button by the HEAD_MIC of testing circuit receive the ground of earphone end, triode T1 conducting, BUTTON_DET is by high step-down, and button is pressed and surpassed sometime, concludes to answer or hang up the telephone; R120 is 45k Ω-55k Ω left and right sides resistance in the dividing potential drop road, R119 115-125k Ω left and right sides resistance.
5, the headset detection method of a kind of portable terminal according to claim 1 is characterized in that described stereo audio power amplifier is SN4188 or LM4888.
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| CNA2008100386482A CN101287202A (en) | 2008-06-06 | 2008-06-06 | Earphone detecting method for mobile terminal |
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| CNA2008100386482A CN101287202A (en) | 2008-06-06 | 2008-06-06 | Earphone detecting method for mobile terminal |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101505333A (en) * | 2008-12-18 | 2009-08-12 | 上海闻泰电子科技有限公司 | Mobile terminal having direct recording function and direct recording method thereof |
| CN101835083A (en) * | 2010-04-12 | 2010-09-15 | 惠州Tcl移动通信有限公司 | Earphone hangup detection method, device and electron device |
| CN101924835A (en) * | 2010-08-17 | 2010-12-22 | 惠州Tcl移动通信有限公司 | Mobile telephone communication method and mobile telephone |
| CN101945172A (en) * | 2010-09-17 | 2011-01-12 | 惠州Tcl移动通信有限公司 | Mobile phone-based earphone recognition calling method and mobile phone |
| CN102325228A (en) * | 2011-08-22 | 2012-01-18 | 惠州Tcl移动通信有限公司 | Mobile phone and method for reducing energy consumption of headset of mobile phone |
| CN102413239A (en) * | 2011-11-15 | 2012-04-11 | 惠州Tcl移动通信有限公司 | Mobile phone and method for detecting earphone mode of mobile phone |
| CN103024632A (en) * | 2012-12-30 | 2013-04-03 | 青岛歌尔声学科技有限公司 | Noise reduction device of earphone |
| CN103581818A (en) * | 2012-07-26 | 2014-02-12 | 深圳富泰宏精密工业有限公司 | Earphone detecting circuit and communication terminal with same |
| CN103731542A (en) * | 2012-10-11 | 2014-04-16 | 北京新媒传信科技有限公司 | Method and device for managing application supporting headset operations |
| CN104038867A (en) * | 2014-06-30 | 2014-09-10 | 无锡中星微电子有限公司 | Bluetooth circuit and Bluetooth device comprising same |
| CN105451149A (en) * | 2015-12-30 | 2016-03-30 | 潍坊歌尔电子有限公司 | Loudspeaker plug detection circuit and electronic device |
| CN108064013A (en) * | 2018-02-23 | 2018-05-22 | 西安闻泰电子科技有限公司 | Earphone detection circuit, earphone detecting method and electronic equipment |
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2008
- 2008-06-06 CN CNA2008100386482A patent/CN101287202A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101505333A (en) * | 2008-12-18 | 2009-08-12 | 上海闻泰电子科技有限公司 | Mobile terminal having direct recording function and direct recording method thereof |
| CN101835083B (en) * | 2010-04-12 | 2013-07-03 | 惠州Tcl移动通信有限公司 | Earphone hangup detection method, device and electron device |
| CN101835083A (en) * | 2010-04-12 | 2010-09-15 | 惠州Tcl移动通信有限公司 | Earphone hangup detection method, device and electron device |
| CN101924835A (en) * | 2010-08-17 | 2010-12-22 | 惠州Tcl移动通信有限公司 | Mobile telephone communication method and mobile telephone |
| CN101945172A (en) * | 2010-09-17 | 2011-01-12 | 惠州Tcl移动通信有限公司 | Mobile phone-based earphone recognition calling method and mobile phone |
| CN102325228A (en) * | 2011-08-22 | 2012-01-18 | 惠州Tcl移动通信有限公司 | Mobile phone and method for reducing energy consumption of headset of mobile phone |
| CN102413239A (en) * | 2011-11-15 | 2012-04-11 | 惠州Tcl移动通信有限公司 | Mobile phone and method for detecting earphone mode of mobile phone |
| CN103581818A (en) * | 2012-07-26 | 2014-02-12 | 深圳富泰宏精密工业有限公司 | Earphone detecting circuit and communication terminal with same |
| CN103581818B (en) * | 2012-07-26 | 2018-02-27 | 深圳富泰宏精密工业有限公司 | Earphone detection circuit and the communication terminal with the earphone detection circuit |
| CN103731542A (en) * | 2012-10-11 | 2014-04-16 | 北京新媒传信科技有限公司 | Method and device for managing application supporting headset operations |
| CN103731542B (en) * | 2012-10-11 | 2015-12-09 | 北京新媒传信科技有限公司 | To management method and the device of supporting the application that earphone operates |
| CN103024632A (en) * | 2012-12-30 | 2013-04-03 | 青岛歌尔声学科技有限公司 | Noise reduction device of earphone |
| CN104038867A (en) * | 2014-06-30 | 2014-09-10 | 无锡中星微电子有限公司 | Bluetooth circuit and Bluetooth device comprising same |
| CN104038867B (en) * | 2014-06-30 | 2017-10-10 | 无锡中感微电子股份有限公司 | Bluetooth circuit and the blue-tooth device including the Bluetooth circuit |
| CN105451149A (en) * | 2015-12-30 | 2016-03-30 | 潍坊歌尔电子有限公司 | Loudspeaker plug detection circuit and electronic device |
| CN105451149B (en) * | 2015-12-30 | 2019-03-12 | 潍坊歌尔电子有限公司 | A kind of loudspeaker plug-pull detecting circuit and electronic equipment |
| CN108064013A (en) * | 2018-02-23 | 2018-05-22 | 西安闻泰电子科技有限公司 | Earphone detection circuit, earphone detecting method and electronic equipment |
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Open date: 20081015 |