CN201928419U - Earphone and mobile communication terminal provided with same - Google Patents

Abstract

The utility model discloses an earphone and a mobile communication terminal provided with the same. The earphone comprises an earphone plug, an earphone controller, a microphone and ear loops which are connected by a lead, wherein the earphone plug is divided into four sections including a ground wire, a microphone control wire, a left sound channel wire and a right sound channel wire; the anode and the cathode of the microphone are respectively and correspondingly connected with the microphone control wire and the ground wire; the left sound channel wire ear loop and the right sound channel wire ear loop are respectively and correspondingly connected between the left sound channel wire and the ground wire as well as between the right sound channel wire and the ground wire; and a resistor and the series branch of a key switch are connected between the anode and the cathode of the microphone in parallel. According to the mobile communication terminal provided with the earphone, the functions of the traditional wire-controlled earphone for playing music, hanging telephone, adjusting volume and the like can be achieved and a Qchat talkback mobile phone is operated through the earphone to execute the talkback and call communications, so that an ideal talkback earphone for the present Qchat talkback mobile phone is provided.

Description

An earphone and a mobile communication terminal equipped with the earphone

technical field

The utility model belongs to the technical field of earphones, and in particular relates to a wire-controlled earphone specially designed for a mobile phone with an intercom function and a mobile communication terminal equipped with the earphone.

Background technique

At present, among wire-controlled earphones applied to mobile communication terminals, most of them can only implement functions such as answering calls, hanging up calls, controlling music playback, and listening to FM radio. With the rapid development of the communication industry and the maturity of EVD0 technology, mobile phones with Qchat intercom function have emerged as the times require and are gradually favored by consumers. QChat is a PTT communication technology based on CDMA 1xEVD0 network launched by Qualcomm, and it is also recognized by the industry as one of the technologies with the best performance in public network clusters. PTT (Push To Talk), which means "Push To Talk", or commonly known as "Push To Talk", has the advantages of quick call establishment and convenient team collaboration. Based on this communication technology, the mobile phone can realize the function of the current walkie-talkie.

For this emerging Qchat intercom mobile phone, how to design a Qchat headset adapted to it, and realize the intercom function on the basis of the traditional wire-controlled headset function, is an urgent problem to be solved in the mobile communication terminal manufacturing industry. main problem.

Utility model content

The purpose of the utility model is to provide a kind of earphone, to be applicable to the existing mobile communication terminal with Qchat intercom function.

In order to solve the above-mentioned technical problems, the utility model adopts the following technical solutions to achieve:

An earphone, comprising an earphone plug, an earphone controller, a microphone and an ear hook connected together by wires; the earphone plug is divided into four sections, including a ground wire, a microphone control wire, a left audio channel wire and a right audio channel wire; The positive and negative poles of the microphones are respectively connected to the microphone control line and the ground line, and the left and right channel ear hooks are respectively connected between the left channel line and the ground line and between the right channel line and the ground line; A series branch of a resistor and a key switch is also connected in parallel between the positive and negative electrodes.

Preferably, the resistor is a precision resistor with an error range of 1%.

Further, the key switch and the microphone are both arranged on the earphone controller.

Still further, a filter capacitor is connected in parallel between the positive and negative poles of the microphone.

Furthermore, starting from the side close to the wire end, the earphone plug is successively divided into four sections: the ground wire, the microphone control wire, the left audio channel wire and the right audio channel wire.

Based on the earphone with the above structure, the utility model further provides a mobile communication terminal equipped with the earphone, which includes two parts: a terminal body and an earphone, and an earphone socket for plugging in the earphone is arranged on the terminal body. The earphone socket is connected to the main board circuit on the terminal body; the earphone includes an earphone plug, an earphone controller, a microphone and an ear hook connected together by wires; the earphone plug is divided into four sections, including ground wire, Microphone control line, left channel line and right channel line; the positive and negative poles of the microphone are respectively connected to the microphone control line and the ground line, and the left and right channel ear hooks are respectively connected to the left channel line and the ground line Between the right channel line and the ground line; between the positive and negative poles of the microphone, a series branch of a resistor and a key switch is connected in parallel.

Further, the earphone socket is provided with a left audio terminal, a right audio terminal and a microphone terminal correspondingly contacting with the left audio channel line, the right audio channel line and the microphone control line on the earphone plug after the earphone plug is inserted. , the left channel terminal, the right channel terminal and the microphone terminal are all connected to the audio circuit on the terminal motherboard, so as to realize the output of the left and right channel audio signals through the ear hook of the earphone, and the audio signal received through the earphone microphone It is transmitted back to the terminal body for processing; wherein, a voltage pull-up branch is also connected to the microphone terminal, and the microphone terminal is connected to the main chip on the main board, and the main chip judges that the user performs the operation through the earphone by detecting the voltage change. operation.

Preferably, the microphone terminal is connected to the analog-to-digital conversion interface of the main chip on the motherboard, so as to identify the change of the voltage amplitude.

Further, in order to detect whether the earphone is inserted into the earphone socket, the utility model is also provided with an earphone insertion state detection terminal in the earphone socket, and the earphone insertion state detection terminal is connected to a voltage pull-up branch, and is connected to the main board The main chip is connected; when the earphone plug is not inserted into the earphone socket, the earphone insertion state detection terminal is connected with the left or right channel terminal, and the left or right channel terminal passes through the pull-down resistor grounded, and after the earphone plug is inserted into the earphone socket, the earphone insertion state detection terminal is disconnected from the left sound channel terminal or the right sound channel terminal.

Still further, the earphone socket is further provided with an antenna terminal for connecting with the FM antenna in the terminal, and the antenna terminal is in contact with the ground wire of the earphone plug after the earphone plug is inserted into the earphone socket.

Compared with the prior art, the advantages and positive effects of the utility model are: the utility model not only realizes the music of the traditional wire-controlled headset through a new design of the headset circuit and the headset socket circuit in the mobile communication terminal used in conjunction with it. Playing, answering and hanging up calls, volume adjustment and other functions, and can also operate the Qchat mobile phone through the earphone to perform the intercom call function, thus providing an ideal intercom headset for the current Qchat intercom mobile phone.

After reading the detailed description of the embodiments of the utility model in conjunction with the accompanying drawings, other features and advantages of the utility model will become clearer.

Description of drawings

Fig. 1 is the plug structural representation of the earphone proposed by the utility model;

Fig. 2 is a circuit schematic diagram of an embodiment of the circuit part of the earphone proposed by the utility model;

Fig. 3 is a working principle diagram of the earphone circuit;

Fig. 4 is a schematic circuit diagram of an embodiment of a mobile communication terminal part used in conjunction with the headset.

Detailed ways

Specific embodiments of the present utility model are described in detail below in conjunction with the accompanying drawings.

In this embodiment, taking a mobile phone as an example of a mobile communication terminal used in conjunction with an earphone, the circuit design schemes of the earphone and the mobile communication terminal are specifically described.

The earphone of this embodiment is designed as a wire-controlled earphone, including an earphone plug, an earphone controller, a microphone and an ear hook connected together by wires. Among them, the earphone plug can be divided into four sections, as shown in Figure 1, starting from the side close to the wire end, it can be defined as the location GND, the microphone control line MIC+, the right channel line SPK/R and the left channel line SPK/L . The ear-hook part preferably includes two parts, the left-channel ear-hook SPKL and the right-channel ear-hook SPKR, that is, two small speakers. Among them, the left channel ear hook SPKL is connected between the left channel wire SPK/L of the earphone plug and the ground wire GND; the right channel ear hook SPKR is connected between the right channel wire SPK/R of the earphone plug and the ground wire GND , see Figure 2. After the earphone plug is inserted into the mobile phone, the audio signal output by the mobile phone can be amplified and output by using the left and right channel ear hooks SPKL and SPKR.

An earphone control circuit is arranged in the earphone controller, and the microphone MIC is preferably arranged on the earphone controller, and its positive pole is connected to the microphone control line MIC+ of the earphone plug, and its negative pole is connected to the ground wire GND of the earphone plug, as shown in FIG. 2 . For the Qchat intercom mobile phone, in order to enable the user to complete the switching control of the mobile phone's conventional functions and the intercom function on the earphone used in conjunction with it, this embodiment designs a circuit consisting of a resistor R and a key switch SW in the earphone control circuit. The series branch formed is connected in parallel between the positive and negative poles of the microphone MIC, as shown in Figure 2. Since the resistance value between the microphone control line MIC+ of the headphone plug and the ground wire GND will change before and after the key switch SW is closed, it can be accurately judged by using this resistance value change and the time the key switch SW is pressed and closed. There are two operating modes of the user. For example, the quick closing of the key switch SW can refer to the user requesting the mobile phone to perform regular functions; the long-time closing of the key switch SW can refer to the user requesting the mobile phone to perform the intercom function. The specific corresponding relationship can be found in the mobile phone software. Make presets. Of course, this embodiment is not limited to the above examples.

通过手机主板电路来检测麦克风控制线MIC+上的电压，若其电压值由V1变为V2，且维持V2的时间较短，比如小于2秒钟，则认为用户执行了快速按压按键开关SW的操作，此时手机主芯片认为用户执行常规功能，比如开启播放音乐、收听FM广播、或者接听来电等，并通过设置软件对应到耳机上的音量键进行音量调节。在手机开启对讲通话功能后，主芯片检测麦克风控制线MIC+上的电压值，在其电压值为V2的期间内，通过耳机上的麦克风MIC接收用户的语音，并传输至手机本体，进而通过手机发送至对方；而当主芯片检测到麦克风控制线MIC+上的电压值变为V1时，则表示按键开关SW断开，停止接收用户语音，并将对方的语音通过耳机传输至本机用户，由此便实现了对讲通话功能。Based on this design idea, this embodiment can specifically adopt the working principle of the earphone as shown in FIG. 3 . A voltage pull-up branch is connected to the positive pole of the microphone MIC, for example, a DC power supply VDD is connected through a pull-up resistor R1, and the pull-up resistor R1 can function as a current limiter in the loop. Assuming that the internal resistance of the microphone MIC is r, when the key switch SW is off, the voltage on the microphone control line MIC+ on the headphone plug is When the key switch SW is closed, since the resistor R is connected in parallel with the internal resistance r of the microphone MIC, the voltage on the microphone control line MIC+ becomes

Detect the voltage on the microphone control line MIC+ through the mainboard circuit of the mobile phone. If the voltage value changes from V1 to V2 and maintains V2 for a short time, such as less than 2 seconds, it is considered that the user has performed the operation of quickly pressing the button switch SW. At this time, the main chip of the mobile phone thinks that the user performs routine functions, such as playing music, listening to FM radio, or answering incoming calls, and adjusts the volume through the setting software corresponding to the volume keys on the headset. After the intercom call function is enabled on the mobile phone, the main chip detects the voltage value on the microphone control line MIC+. During the period of its voltage value of V2, the user's voice is received through the microphone MIC on the earphone and transmitted to the mobile phone body, and then passed The mobile phone sends to the other party; and when the main chip detects that the voltage value on the microphone control line MIC+ changes to V1, it means that the key switch SW is disconnected, stops receiving the user's voice, and transmits the other party's voice to the local user through the earphone. This realizes the intercom call function.

In order to improve detection accuracy, in this embodiment, a precision resistor with an accuracy of 1% is preferably used as the resistor R for circuit design. The key switch SW is preferably set on the earphone controller, so as to facilitate the user's operation.

In order to suppress noise, a filter capacitor C can be further connected in parallel between the positive and negative poles of the microphone MIC, as shown in Figure 2 and Figure 3, to improve the audio effect.

Based on the working principle of the earphone shown in Figure 3, in this embodiment, the voltage pull-up branch composed of the resistor R1 and the DC voltage VDD in series is preferably arranged on the main board of the mobile phone body, as shown in Figure 4, specifically connected to the mobile phone body On the microphone terminal 2 of the headphone socket J1. The microphone terminal 2 is simultaneously used as the working mode detection pin EAR_DET2 to connect to the main chip on the main board of the mobile phone, preferably connected to the analog-to-digital conversion interface ADC of the main chip, and the main chip judges which working mode to execute according to the voltage value generated by conversion, such as General functions or the intercom call function unique to Qchat mobile phones. The microphone terminal 2 is connected to the positive pole MIC_P of the microphone interface on the main board of the mobile phone through the DC blocking capacitor C1 connected in series at the same time, and transmits the voice signal received by the microphone MIC on the earphone to the audio circuit on the main board of the mobile phone for processing. The filter capacitors C3 and C4 connected in parallel between the microphone terminal 2 and the system ground can filter the audio signal transmitted to the mobile phone body to improve the quality of voice transmission. The negative pole MIC_N of the microphone interface on the main board of the mobile phone is grounded through the DC blocking capacitor C2 connected in series.

In this embodiment, each pin in the earphone socket J1 is defined as follows: pin 1 is an antenna terminal, which is connected to the system ground in the mobile phone body. When the earphone is inserted, not only can realize the common ground of the mobile phone body circuit and the earphone circuit, but also It is also possible to ground the FM antenna FM_ANT formed by the ground wire in the earphone. When the mobile phone body is turned on to listen to the radio function, it can receive the FM FM signal of the radio station; the 2 pin is the microphone terminal; the 3 pin is the left channel terminal HPH_L, on the one hand Connect the left channel audio output channel of the audio circuit on the main board of the mobile phone, on the other hand, it is grounded through the pull-down resistor R3, and when the earphone is inserted, it is in contact with the left channel line SPK/L of the earphone plug; pin 4 is the right channel terminal HPH_R, connected to the right channel audio output channel of the audio circuit on the main board of the mobile phone, and when the earphone is inserted, it is in contact with the right channel line SPK/R of the earphone plug; pin 5 is the detection terminal of the earphone insertion state, connected to the main Chip, such as one of the GPIO ports connected to the main chip, the main chip can determine whether the earphone is inserted into the earphone socket J1 according to the high or low level status of the GPIO port. Specifically, a voltage pull-up branch composed of a pull-up resistor R2 and a DC power supply VCC connected in series is connected to the detection terminal 5. The channel terminal HPH_L is in contact with each other, so that its potential is pulled down to close to 0V through the pull-down resistor R3. At this time, the main chip judges that the earphone is not inserted. When the earphone is inserted into the earphone jack J1, the detection terminal 5 is pushed away by the earphone plug, so that it is separated from the left channel terminal HPH_L. The presence of VCC pulls it up to a high level. After the main chip detects this voltage change through its GPIO port, it determines that the earphone is inserted into the earphone socket J1, and then displays the earphone icon on the screen of the mobile phone to prompt the user to insert an earphone. The mobile phone is currently playing an audio signal, and the audio signal is output through the earphone.

Of course, the earphone insertion state detection terminal 5 can also be designed to be in contact with the right channel terminal HPH_R in the earphone socket J1. At this time, the pull-down resistor R3 needs to be connected to the right channel terminal HPH_R, which can also be realized. The above-mentioned earphone insertion state detection function is not specifically limited in this embodiment.

The working principle of the earphone circuit proposed in this embodiment will be described in detail below through a specific example.

反馈到主板上主芯片的ADC接口，通过设置软件对应到耳机上的音量键进行音量调节，并将手机当前所播放的音频信号传输至耳机进行输出。当耳机插入并快速按下按键开关SW时(时间小于2s)，主芯片响应用户的操作，执行例如接听电话或者挂断电话等常规功能。而当耳机插入并较长时间(大于3s)按下按键开关SW时，在麦克风控制线MIC+与地线GND之间可以得到精密电阻R与麦克风MIC内阻r之间的并联电阻阻值为

根据分压公式得到工作模式检测管脚EAR_DET2上的电压为将该电压值反馈到主芯片的ADC接口，由主芯片响应用户操作，执行对讲通话功能，并在按键开关SW按下期间将用户的语音发送至对方，而在按键开关SW断开的期间将对方语音传送至用户，从而使手机实现了对讲机的功能。Assume that the precision resistor R in the earphone circuit has a resistance of 6.8KΩ, the internal resistance r of the microphone MIC is 5.5KΩ, the DC voltage VDD is 2.1V, and the pull-up resistor R1 has a resistance of 2.2KΩ. When the earphone is inserted into the earphone socket J1, the voltage on the earphone insertion state detection terminal 5 becomes high level, which is fed back to the GPIO port of the main chip, notifies the main chip that an earphone is inserted, executes the interrupt, and displays the earphone on the screen of the mobile phone. icon. At the same time, the voltage on the working mode detection pin EAR_DET2 will also change accordingly. At this time, the voltage on the microphone control line MIC+ is obtained as

Feedback to the ADC interface of the main chip on the main board, adjust the volume through the setting software corresponding to the volume keys on the earphone, and transmit the audio signal currently played by the mobile phone to the earphone for output. When the headset is plugged in and the key switch SW is pressed quickly (less than 2s), the main chip responds to the user's operation and performs routine functions such as answering or hanging up the phone. When the earphone is inserted and the key switch SW is pressed for a long time (more than 3s), the parallel resistance between the precision resistance R and the internal resistance r of the microphone MIC can be obtained between the microphone control line MIC+ and the ground line GND.

According to the voltage division formula, the voltage on the working mode detection pin EAR_DET2 is The voltage value is fed back to the ADC interface of the main chip, and the main chip responds to the user's operation, performs the intercom call function, and sends the user's voice to the other party when the key switch SW is pressed, and during the period when the key switch SW is turned off The voice of the other party is transmitted to the user, so that the mobile phone realizes the function of a walkie-talkie.

The earphone design scheme of this embodiment sets the corresponding threshold according to the electrical characteristic value to detect the normal insertion state of the earphone and the pressing state of the key switch SW, thereby realizing functions such as earphone insertion identification, music playback, and intercom conversation, which can fully meet the current requirements. Various earphone control functions of Qchat intercom mobile phone.

Of course, the earphone design scheme proposed in this embodiment is also applicable to other terminal products except mobile phones, and this embodiment does not specifically limit it.

It should be noted that the above description is only a preferred embodiment of the utility model, and those skilled in the art can make some improvements and modifications without departing from the principle of the utility model , These improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims (10)

1. an earphone comprises the headset plug, earphone controller, microphone and the ear-hang that link together by lead; It is characterized in that: described headset plug is divided into four sections, comprises ground wire, microphone control line, L channel line and R channel line; The positive and negative electrode of described microphone is connected with the microphone control line is corresponding with ground wire respectively, and left and right sound channels ear-hang correspondence respectively is connected between L channel line and the ground wire and between R channel line and the ground wire; Between the positive and negative electrode of microphone, also be parallel with the series arm of resistance and key switch.

2. earphone according to claim 1 is characterized in that: described resistance is error range at 1% precision resistance.

3. earphone according to claim 1 and 2 is characterized in that: described key switch and microphone all are arranged on the described earphone controller.

4. earphone according to claim 1 and 2 is characterized in that: also be parallel with filter capacitor between the positive and negative electrode of described microphone.

5. earphone according to claim 1 and 2 is characterized in that: described headset plug is near a side of conductor wire end, marks off four sections on described ground wire, microphone control line, L channel line and R channel line successively.

6. mobile communication terminal, it is characterized in that: comprise the terminal body and as the described earphone of each claim in the claim 1 to 5, described terminal body is provided with the earphone socket of the described earphone that is used to peg graft, and described earphone socket is connected with motherboard circuit on the terminal body.

7. mobile communication terminal according to claim 6, it is characterized in that: be provided with in described earphone socket after headset plug inserts respectively and the corresponding L channel terminal that contacts of L channel line, R channel line and microphone control line, R channel terminal and microphone terminal on the headset plug, described L channel terminal, R channel terminal and microphone terminal all are connected with voicefrequency circuit on the terminal mainboard; Wherein, on described microphone terminal, be connected with and draw branch road on the voltage, and described microphone terminal is connected with master chip on the mainboard.

8. mobile communication terminal according to claim 7 is characterized in that: the analog-to-digital conversion interface of master chip is connected on described microphone terminal and the mainboard.

9. mobile communication terminal according to claim 7 is characterized in that: also be provided with earphone and insert the state-detection terminal in described earphone socket, described earphone inserts the state-detection terminal and connects on the voltage and draw branch road, and is connected with master chip on the mainboard; When headset plug is not inserted in the earphone socket, described earphone inserts the state-detection terminal and is communicated with L channel terminal or R channel terminal, and described L channel terminal or R channel terminal are by pull down resistor ground connection, and after headset plug was inserted in the earphone socket, described earphone inserted state-detection terminal and L channel terminal or R channel terminal and disconnects.

10. according to each described mobile communication terminal in the claim 6 to 9, it is characterized in that: in described earphone socket, also be provided with and be used for the antenna terminal that is connected with the frequency-modulated antenna of terminal, described antenna terminal contacts with the ground wire of headset plug after headset plug is inserted in the earphone socket.

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