KR101595390B1 - Mobile terminal and control method thereof - Google Patents

Abstract

The present invention relates to a mobile terminal having an ear-microphone interface capable of interfacing an ear-microphone with a mobile terminal through a micro-USB socket and a control method thereof, and a socket for connecting a microphone to the ear- A switching unit for checking whether a microphone is connected or switching a voltage applied to the specific terminal so as to use the connected microphone; and a control unit for checking connection of the socket and ear microphone, disconnection of the socket and ear microphone, And a control unit for controlling the switching unit according to the use of the switching unit.

Description

[0001] MOBILE TERMINAL AND CONTROL METHOD THEREOF [0002]

The present invention relates to a mobile terminal having an ear-microphone interface capable of interfacing an ear-microphone with a mobile terminal through a micro-USB socket and a control method thereof.

The terminal can move And can be divided into a mobile / portable terminal and a stationary terminal depending on whether the mobile terminal is a mobile terminal or a mobile terminal. The mobile terminal can be divided into a handheld terminal and a vehicle mount terminal according to whether the user can directly carry the mobile terminal.

Such a terminal has various functions, for example, in the form of a multimedia device having multiple functions such as photographing and photographing of a moving picture, reproduction of a music or video file, reception of a game and broadcasting, etc. .

Recently, mobile handset manufacturers are studying standardized chargers to save users money and tend to adopt a micro USB (Universal Serial Bus) as a new standard charger design to adopt. Since the micro USB is supplied with both data (for example, D +, D-) and a power source (for example, VBUS and GND), the micro USB is being studied to provide a new interface using the micro USB. In particular, you need three data lines (eg Speaker-R, Speaker-L, MIC) to use an ear microphone, but Micro USB only supports two data lines (eg D-, D + MIC) in order to support the interface.

The present invention provides a mobile terminal capable of interfacing an ear-microphone with a mobile terminal through a micro-USB socket and a control method thereof.

In addition, the present invention provides a mobile terminal capable of double-checking whether a microphone is connected when an ear-microphone is interfaced to a micro-USB socket, and a control method thereof.

The present invention also provides a mobile terminal for selectively enabling a microphone line according to whether an ear-microphone is connected to a micro-USB socket and a control method thereof.

The present invention also provides a mobile terminal and a control method thereof for selectively enabling a microphone line according to whether a mobile terminal is in a call connection mode when an ear-microphone is interfaced with a micro-USB socket.

A mobile terminal according to an embodiment of the present invention for realizing the above object includes a socket for connecting an ear microphone, a socket for checking whether a microphone is connected to a specific terminal of the socket, And a control unit for checking connection of the socket and the ear microphone or disconnection of the socket and the ear microphone or controlling the switching unit depending on whether the microphone is used or not.

In order to achieve the above object, a mobile terminal according to an embodiment of the present invention detects a logic level of a specific terminal of a socket, determines that the ear microphone is connected to the socket according to the logic level, It is determined that a predetermined accurate ear muff is connected if the detected voltage level of the specific terminal is within a specific voltage level.

In the mobile terminal according to at least one embodiment of the present invention configured as described above, when the ear-microphone is interfaced with the mobile terminal through the micro-USB socket, it is possible to double check whether the microphone is connected to check the connection .

In addition, the present invention has an effect of effectively using a micro-USB bus having a small number of terminals by selectively enabling a micro-line depending on whether an ear-microphone is connected to a micro-USB socket.

Hereinafter, a mobile terminal related to the present invention will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

The mobile terminal described in this specification may include a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), navigation and the like. However, it will be understood by those skilled in the art that the configuration according to the embodiments described herein may be applied to a fixed terminal such as a digital TV, a desktop computer, and the like, unless the configuration is applicable only to a mobile terminal.

1 is a block diagram of a mobile terminal according to an embodiment of the present invention.

The mobile terminal 100 includes a wireless communication unit 110, an audio / video input unit 120, a user input unit 130, a sensing unit 140, an output unit 150, a memory 160, A controller 170, a controller 180, a power supply 190, and the like. The components shown in FIG. 1 are not essential, and a mobile terminal having more or fewer components may be implemented.

Hereinafter, the components will be described in order.

The wireless communication unit 110 may include one or more modules for enabling wireless communication between the mobile terminal 100 and the wireless communication system or between the mobile terminal 100 and the network in which the mobile terminal 100 is located. For example, the wireless communication unit 110 may include a broadcast receiving module 111, a mobile communication module 112, a wireless Internet module 113, a short range communication module 114, and a location information module 115 .

The broadcast receiving module 111 receives broadcast signals and / or broadcast-related information from an external broadcast management server through a broadcast channel.

The broadcast channel may include a satellite channel and a terrestrial channel. The broadcast management server may refer to a server for generating and transmitting broadcast signals and / or broadcast related information, or a server for receiving broadcast signals and / or broadcast related information generated by the broadcast management server and transmitting the generated broadcast signals and / or broadcast related information. The broadcast signal may include a TV broadcast signal, a radio broadcast signal, a data broadcast signal, and a broadcast signal in which a data broadcast signal is combined with a TV broadcast signal or a radio broadcast signal.

The broadcast-related information may refer to a broadcast channel, a broadcast program, or information related to a broadcast service provider. The broadcast-related information may also be provided through a mobile communication network. In this case, it may be received by the mobile communication module 112.

The broadcast-related information may exist in various forms. For example, an EPG (Electronic Program Guide) of DMB (Digital Multimedia Broadcasting) or an ESG (Electronic Service Guide) of Digital Video Broadcast-Handheld (DVB-H).

For example, the broadcast receiving module 111 may be a Digital Multimedia Broadcasting-Terrestrial (DMB-T), a Digital Multimedia Broadcasting-Satellite (DMB-S), a Media Forward Link Only (DVF-H) And a Digital Broadcasting System (ISDB-T) (Integrated Services Digital Broadcast-Terrestrial). Of course, the broadcast receiving module 111 may be adapted to other broadcasting systems as well as the digital broadcasting system described above.

The broadcast signal and / or broadcast related information received through the broadcast receiving module 111 may be stored in the memory 160.

The mobile communication module 112 transmits and receives radio signals to at least one of a base station, an external terminal, and a server on a mobile communication network. The wireless signal may include various types of data depending on a voice call signal, a video call signal or a text / multimedia message transmission / reception.

The wireless Internet module 113 is a module for wireless Internet access, and may be built in or externally attached to the mobile terminal 100. WLAN (Wi-Fi), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access) and the like can be used as wireless Internet technologies.

The short-range communication module 114 refers to a module for short-range communication. Bluetooth, Radio Frequency Identification (RFID), infrared data association (IrDA), Ultra Wideband (UWB), ZigBee, and the like can be used as a short range communication technology.

The position information module 115 is a module for obtaining the position of the mobile terminal, and a representative example thereof is a Global Position System (GPS) module.

Referring to FIG. 1, an A / V (Audio / Video) input unit 120 is for inputting an audio signal or a video signal, and may include a camera 121 and a microphone 122. The camera 121 processes an image frame such as a still image or moving image obtained by the image sensor in the video communication mode or the photographing mode. The processed image frame can be displayed on the display unit 151. [

The image frame processed by the camera 121 may be stored in the memory 160 or transmitted to the outside through the wireless communication unit 110. [ Two or more cameras 121 may be provided depending on the use environment.

The microphone 122 receives an external sound signal through a microphone in a communication mode, a recording mode, a voice recognition mode, or the like, and processes it as electrical voice data. The processed voice data can be converted into a form that can be transmitted to the mobile communication base station through the mobile communication module 112 when the voice data is in the call mode, and output. Various noise reduction algorithms may be implemented in the microphone 122 to remove noise generated in receiving an external sound signal.

The user input unit 130 generates input data for a user to control the operation of the terminal. The user input unit 130 may include a key pad dome switch, a touch pad (static / static), a jog wheel, a jog switch, and the like.

The sensing unit 140 senses the current state of the mobile terminal 100 such as the open / close state of the mobile terminal 100, the position of the mobile terminal 100, the presence or absence of user contact, the orientation of the mobile terminal, And generates a sensing signal for controlling the operation of the mobile terminal 100. For example, when the mobile terminal 100 is in the form of a slide phone, it is possible to sense whether the slide phone is opened or closed. It is also possible to sense the power supply of the power supply unit 190, whether the interface unit 170 is connected to an external device, and the like. Meanwhile, the sensing unit 140 may include a proximity sensor 141.

The output unit 150 is for generating output related to the visual, auditory or tactile sense and includes a display unit 151, an audio output module 152, an alarm unit 153, and a haptic module 154 .

The display unit 151 displays (outputs) information processed by the mobile terminal 100. For example, when the mobile terminal is in the call mode, a UI (User Interface) or a GUI (Graphic User Interface) associated with a call is displayed. When the mobile terminal 100 is in the video communication mode or the photographing mode, the photographed and / or received video or UI and GUI are displayed.

The display unit 151 may be a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), a flexible display display, and a 3D display.

Some of these displays may be transparent or light transmissive so that they can be seen through. This can be referred to as a transparent display, and a typical example of the transparent display is TOLED (Transparent OLED) and the like. The rear structure of the display unit 151 may also be of a light transmission type. With this structure, the user can see an object located behind the terminal body through the area occupied by the display unit 151 of the terminal body.

There may be two or more display units 151 according to the embodiment of the mobile terminal 100. For example, in the mobile terminal 100, a plurality of display portions may be spaced apart from one another or may be disposed integrally with each other, or may be disposed on different surfaces.

(Hereinafter, referred to as a 'touch screen') in which a display unit 151 and a sensor for sensing a touch operation (hereinafter, referred to as 'touch sensor') form a mutual layer structure, It can also be used as an input device. The touch sensor may have the form of, for example, a touch film, a touch sheet, a touch pad, or the like.

The touch sensor may be configured to convert a change in a pressure applied to a specific portion of the display unit 151 or a capacitance generated in a specific portion of the display unit 151 into an electrical input signal. The touch sensor can be configured to detect not only the position and area to be touched but also the pressure at the time of touch.

If there is a touch input to the touch sensor, the corresponding signal (s) is sent to the touch controller. The touch controller processes the signal (s) and transmits the corresponding data to the controller 180. Thus, the control unit 180 can know which area of the display unit 151 is touched or the like.

Referring to FIG. 1, a proximity sensor 141 may be disposed in an inner region of the mobile terminal or in the vicinity of the touch screen, which is surrounded by the touch screen. The proximity sensor refers to a sensor that detects the presence or absence of an object approaching a predetermined detection surface or a nearby object without mechanical contact using the force of an electromagnetic field or infrared rays. The proximity sensor has a longer life span than the contact sensor and its utilization is also high.

Examples of the proximity sensor include a transmission type photoelectric sensor, a direct reflection type photoelectric sensor, a mirror reflection type photoelectric sensor, a high frequency oscillation type proximity sensor, a capacitive proximity sensor, a magnetic proximity sensor, and an infrared proximity sensor. And to detect the proximity of the pointer by the change of the electric field along the proximity of the pointer when the touch screen is electrostatic. In this case, the touch screen (touch sensor) may be classified as a proximity sensor.

Hereinafter, for convenience of explanation, the act of recognizing that the pointer is positioned on the touch screen while the pointer is not in contact with the touch screen is referred to as "proximity touch & The act of actually touching the pointer on the screen is called "contact touch. &Quot; The position where the pointer is proximately touched on the touch screen means a position where the pointer is vertically corresponding to the touch screen when the pointer is touched.

The proximity sensor detects a proximity touch and a proximity touch pattern (e.g., a proximity touch distance, a proximity touch direction, a proximity touch speed, a proximity touch time, a proximity touch position, a proximity touch movement state, and the like). Information corresponding to the detected proximity touch operation and the proximity touch pattern may be output on the touch screen.

The audio output module 152 may output audio data received from the wireless communication unit 110 or stored in the memory 160 in a call signal reception mode, a call mode or a recording mode, a voice recognition mode, a broadcast reception mode, The sound output module 152 also outputs sound signals related to functions (e.g., call signal reception sound, message reception sound, etc.) performed in the mobile terminal 100. [ The audio output module 152 may include a receiver, a speaker, a buzzer, and the like.

The alarm unit 153 outputs a signal for notifying the occurrence of an event of the mobile terminal 100. Examples of events that occur in the mobile terminal include call signal reception, message reception, key signal input, touch input, and the like. The alarm unit 153 may output a signal for notifying the occurrence of an event in a form other than the video signal or the audio signal, for example, vibration. The video signal or the audio signal may be output through the display unit 151 or the audio output module 152 so that they may be classified as a part of the alarm unit 153.

The haptic module 154 generates various tactile effects that the user can feel. A typical example of the haptic effect generated by the haptic module 154 is vibration. The intensity and pattern of the vibration generated by the hit module 154 can be controlled. For example, different vibrations may be synthesized and output or sequentially output.

In addition to the vibration, the haptic module 154 may include a pin arrangement vertically moving with respect to the contact skin surface, a spraying force or a suction force of the air through the injection port or the suction port, a touch on the skin surface, contact with an electrode, And various tactile effects such as an effect of reproducing a cold sensation using an endothermic or exothermic element can be generated.

The haptic module 154 can be implemented not only to transmit the tactile effect through the direct contact but also to allow the user to feel the tactile effect through the muscular sensation of the finger or arm. The haptic module 154 may include two or more haptic modules 154 according to the configuration of the mobile terminal 100. [

The memory 160 may store a program for the operation of the controller 180 and temporarily store input / output data (e.g., a phone book, a message, a still image, a moving picture, etc.). The memory 160 may store data on vibration and sound of various patterns outputted when a touch is input on the touch screen.

The memory 160 may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or XD memory), a RAM (Random Access Memory), SRAM (Static Random Access Memory), ROM (Read Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), PROM A disk, and / or an optical disk. The mobile terminal 100 may operate in association with a web storage that performs a storage function of the memory 160 on the Internet.

The interface unit 170 serves as a path for communication with all external devices connected to the mobile terminal 100. The interface unit 170 receives data from an external device or supplies power to each component in the mobile terminal 100 or transmits data to the external device. For example, a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, a port for connecting a device having an identification module, an audio I / O port, A video input / output (I / O) port, an earphone port, and the like may be included in the interface unit 170.

The identification module is a chip for storing various information for authenticating the use right of the mobile terminal 100 and includes a user identification module (UIM), a subscriber identity module (SIM), a general user authentication module A Universal Subscriber Identity Module (USIM), and the like. Devices with identification modules (hereinafter referred to as "identification devices") can be manufactured in a smart card format. Accordingly, the identification device can be connected to the terminal 100 through the port.

When the mobile terminal 100 is connected to an external cradle, the interface unit may be a path through which power from the cradle is supplied to the mobile terminal 100, or various command signals input by the user to the cradle may be transmitted It can be a passage to be transmitted to the terminal. The various command signals or the power source input from the cradle may be operated as a signal for recognizing that the mobile terminal is correctly mounted on the cradle.

The controller 180 typically controls the overall operation of the mobile terminal. For example, voice communication, data communication, video communication, and the like. The control unit 180 may include a multimedia module 181 for multimedia playback. The multimedia module 181 may be implemented in the control unit 180 or may be implemented separately from the control unit 180. [

The controller 180 may perform a pattern recognition process for recognizing handwriting input or drawing input performed on the touch screen as characters and images, respectively.

The power supply unit 190 receives external power and internal power under the control of the controller 180 and supplies power necessary for operation of the respective components.

The various embodiments described herein may be embodied in a recording medium readable by a computer or similar device using, for example, software, hardware, or a combination thereof.

According to a hardware implementation, the embodiments described herein may be implemented as application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays May be implemented using at least one of a processor, controllers, micro-controllers, microprocessors, and other electronic units for performing other functions. In some cases, The embodiments described may be implemented by the control unit 180 itself.

According to a software implementation, embodiments such as the procedures and functions described herein may be implemented with separate software modules. Each of the software modules may perform one or more of the functions and operations described herein. Software code can be implemented in a software application written in a suitable programming language. The software code is stored in the memory 160 and can be executed by the control unit 180. [

Hereinafter, the embodiments described below may be used alone or in combination with each other. In addition, the embodiments described below may be used in combination with the above-described user interface (UI). The present invention relates to an antenna device for receiving a broadcasting signal which can be externally connected when a ear-microphone is connected through a micro USB USB socket provided in a mobile terminal. The micro USB socket is used as a socket or an outlet for interfacing a mobile terminal with various external devices such as a PC, a charger, and an earphone.

2 is a block diagram illustrating a configuration of a mobile terminal having a micro USB interface according to the present invention.

As shown in the drawing, the mobile terminal includes a micro USB socket 300, an ear microphone 200 connected to the micro USB socket, and an accessory connected to the micro USB socket 300, And a control unit 180 for controlling input / output of data.

The micro USB socket 300 is composed of five terminals.

The micro USB socket 300 includes two power terminals (e.g., VBUS and GND) 301 and 302 and two data transfer terminals (e.g., D- and D +) 303 and 304 and one ID And a detection terminal (e.g., ID) 305 are included. Here, the ID detection terminal 305 is used for detecting an accessory (e.g., TA, USB, TV out, UART, OTG, etc.) connected to the micro USB socket. That is, a different resistance value is assigned to each accessory, and the type of the accessory is determined based on the detected voltage according to the other resistance value.

In addition, the micro-USB socket 300 may be internally connected to a radio receiver 310 so that the ear-microphone 200 may be used as an antenna.

The sound signal output terminals EAR_L and EAR_R of the control unit 180 are respectively connected to the left earphone 211 and the right earphone 212 through data transmission terminals 303 and 304,

The microphone terminal MIC of the controller 180 is connected to the microphone 213 via the first switch 331 and the ID detection terminal 305. The microphone terminal (MIC) receives a signal input from the microphone (213).

The ADC converter terminal ADC of the controller 180 is connected to the second switch 332 and the ID detection terminal 305 and is used for detecting whether or not a microphone is connected. Here, the first switch 331 connected to the microphone MIC and the second switch 332 connected to the AD converter terminal ADC operate in opposite directions. For example, when the first switch 331 is turned on, the second switch 332 is turned off, and when the first switch 331 is turned off, the second switch 332 is turned on. On / off of the first switch 331 and the second switch 332 can be controlled either at first or later, with a predetermined time difference.

The first and second accessory detection terminals ACC_INT_FLOAT and ACC_INT_GND of the controller 180 are connected to the ID detection terminal 305 through the first comparator 341 and the second comparator 342, respectively. It is possible to determine whether the ear-microphone is connected according to the logical level (e.g., H, L) output from the first comparator 341 or the second comparator 342. [ The concrete determination method will be described with reference to the logical value table.

A third switch 323 is connected to the ID detection terminal 305 of the micro USB socket 300 to apply a microphone bias or to check the connection of the ear microphone. The third switch is composed of two input terminals (= first and second input terminals) and two output terminals (= first and second output terminals). The first, second, and third switches may be referred to as a switching unit for convenience of explanation. The first input terminal receives a first voltage (e.g., 2.6V), and the first output terminal is connected to the ID detection terminal 305 through a first resistor (e.g., 200K). The second input terminal is connected to the ID detection terminal 323 through a second resistor (for example, 2.2KΩ) and the second output terminal is connected to the ID detection terminal 323.

The third switch 323 connects the first input terminal and the first output terminal or connects the second input terminal and the second output terminal according to the switching of the controller 180. (For example, 2.6 V) is supplied to the ID detection terminal 305 through the first resistor (for example, 200 K) and the second voltage (for example, 2.3 V) is supplied to the ID detection terminal 305 according to the switching of the third switch 323. [ Is supplied to the ID detection terminal 305 through the second resistor (e.g., 2.2K?). Accordingly, a first voltage (e.g., 2.6 V) is applied to the first comparator 341 in the idle state (= the ear microphone is not plugged) according to the switching of the third switch 323, And a positive input of the second comparator 342.

The first comparator 341 outputs a low level because the first voltage (for example, 2.6 V) applied to the negative input terminal is greater than the reference voltage (for example, 2.2 V) 342 is high because the first voltage (e.g., 2.6V) applied to the positive input terminal is greater than the reference voltage (e.g., 0.4V). That is, in the idle state, a low is applied to the first accessory detection terminal ACC_INT_FLOAT and a high is applied to the second accessory detection terminal ACC_INT_GND.

FIG. 3 is a flowchart illustrating a process of detecting a connection of an ear-microphone and performing a telephone conversation according to the present invention.

If it is assumed that the ear-microphone 200 is plugged into the micro USB socket 300 (S101), the third switch 323 is switched to the first input terminal and the first output terminal (The resistance equivalent circuit by the first resistor 321 and the internal resistance of the microphone) when the ear microphone is plugged in the state where the first voltage (for example, 2.6 V) is applied, The controller 180 determines that the logic level applied to the first accessory detection terminal ACC_INT_FLOAT is high and the second accessory detection terminal ACC_INT_GND is at the high level, It is detected whether the applied logic level is low (S102). If the logical level applied to the first accessory detection terminal ACC_INT_FLOAT is low, it is in an idle state (state in which the ear-microphone is not plugged) (S107).

Accordingly, when the logic level applied to the first accessory detection terminal ACC_INT_FLOAT is high and the logic level applied to the second accessory detection terminal ACC_INT_GND is low, the controller 180 determines that the ear- It is judged to be plugged.

However, the controller 180 checks again to see if the ear-microphone is the pre-designated ear-microphone. For this, the controller 180 switches the third switch 323 so that the second input terminal and the second output terminal are connected (S103) (= a second voltage (for example, 2.3 V) When the plug is plugged, the ID detecting terminal 305 detects a voltage of 1.31 V to 1.97 V by the resistance equivalent circuit (the resistance equalizing circuit by the second resistor 322 and the internal resistance of the microphone).

Then, the control unit 180 detects whether the logical level applied to the second accessory detection terminal ACC_INT_GND is high (S104). If the logic level applied to the second accessory detection terminal ACC_INT_GND is high and the logic level applied to the first accessory detection terminal ACC_INT_FLOAT is also high, It is judged that the microphone is plugged. However, if the logical level applied to the second accessory detection terminal ACC_INT_GND is low, it is determined to be in the idle state (= the ear-microphone is not plugged).

If it is confirmed that the ear-microphone is plugged through the two check operations as described above, the third checking process is performed last.

The control unit 180 wakes up the ADC converter terminal ADC (S105). Then, the second switch 332 is enabled to connect the ID detection terminal 305 and the A / D converter terminal ADC. Accordingly, when a voltage of 1.31 V to 1.97 V is detected by the ADC converter terminal (ADC), it can be determined that the pre-designated ear-microphone is plugged. That is, when a second voltage (for example, 2.3 V) is applied through the switching of the third switch 323 and the earphone-microphone is plugged, the resistance equivalent circuit (the second resistor 322 and the internal resistance of the microphone The ID detection terminal 305 needs to detect a voltage of 1.31 V to 1.97 V by the resistor-equivalent circuit.

Here, when the second switch 332 is enabled, the first switch 331 connected to the microphone terminal MIC is disabled. In the idle state or the second plugging check state, the ADC converter terminal (ADC) does not wake up.

If it is determined that the ear-microphone is plugged as described above, the third switch 323 is switched so that the first input terminal and the first output terminal are connected again (S108). That is, the third switch 323 is switched to a state in which another accessory can be detected to be plugged again.

After the third switch is switched as described above, the control unit 180 recognizes that the ear-microphone is plugged in until the ear-microphone is unplugged (S110).

Then, the controller 180 determines whether the current mode of the mobile terminal is the call mode (or the phone call mode). The description of the case where the current mode is not the call mode (S111) will be described with reference to other drawings.

If the current mode is the call mode, the controller 180 switches the third switch 323 to connect the second input terminal and the second output terminal at step S112. That is, the second voltage (i.e., the microphone bias voltage) is applied to the microphone 213 via the ID detection terminal 305. [

Then, the control unit 180 turns off the ADC converter terminal ADC (S113). That is, the second switch 332 is disabled. Turn on the microphone terminal (MIC). That is, the first switch 331 is enabled (S114). As described above, noise can be prevented by first disabling the second switch 332 and then enabling the first switch 331.

When the microphone terminal MIC and the microphone 213 of the ear-microphone 200 are connected through the switching of the first switch 331 and the second switch 332 as described above, the user can start the telephone conversation.

FIG. 4 is a flowchart illustrating a process for detecting un-plugging of an ear-microphone during a call according to the present invention.

As shown in the figure, it is assumed that the telephone conversation is executed using the ear-microphone (S201). If the logic level applied to the first accessory detection terminal ACC_INT_FLOAT is low (YES in S202) and the logic level applied to the second accessory detection terminal ACC_INT_GND is high (S203 The control unit 180 determines that the ear-microphone is unplugged (S204).

For example, when a telephone call is being performed using the ear-microphone as described above, the third switch 323 is plugged in a state where a second voltage (for example, 2.3 V) is applied through the switching of the third switch 323, The ID detection terminal 305 detects the voltage of 1.31 V to 1.97 V by the resistance equivalent circuit of the microphone (the second resistance 322 and the resistance equivalent circuit by the internal resistance of the microphone).

However, when the ear microphone is unplugged, the second voltage (e.g., 2.3V) is applied to the first comparator 341 so that the output is low, and the second voltage is applied to the second comparator 342 The output of the second comparator 342 becomes high. That is, when the earphone 200 is unplugged suddenly during a telephone call, the second accessory detection terminal ACC_INT_FLOAT and the second accessory detection terminal ACC_INT_GND are applied by the second voltage (= microphone bias voltage) The logic level is changed.

When the logic levels applied to the first accessory detection terminal ACC_INT_FLOAT and the second accessory detection terminal ACC_INT_GND during the telephone call are low and high respectively as described above, Is unplugged.

The first switch 331 connected to the microphone terminal MIC is disabled (S205), and the second switch 332 connected to the A / D converter terminal (ADC) is again enabled (S206). Then, the third switch 323 is switched so that the first input terminal and the first output terminal are connected (S207). That is, the third switch 323 is switched so that the first voltage (for example, 2.6 V) is applied to the ID detection terminal 305 through the first resistor 321. Accordingly, the state of the micro USB socket 300 becomes idle again (S208).

FIG. 5 is a flowchart illustrating a process of detecting an unplugging of an echo-microphone in a situation other than during a call according to the present invention.

As shown in the figure, it is assumed that a sound of an additional function (e.g., music, radio, TV) other than the telephone communication function is output using the ear-microphone (S301). Although the microphone 213 is not used in the ear-microphone 200, the ear-microphone which is plugged in the state where the first voltage (for example, 2.6 V) is applied through the switching of the third switch 323 The ID detection terminal 305 detects a voltage of 0.015 V to 0.029 V by the resistance equivalent circuit (the first resistor 321 and the resistor equivalent circuit by the internal resistance of the microphone).

Accordingly, if the logic level applied to the first accessory detection terminal ACC_INT_FLOAT is low and the logic level applied to the second accessory detection terminal ACC_INT_GND is high (YES in S302) It is determined that the ear-microphone is plugged (S303).

When the earphone is unplugged in the plugged state as described above, the first voltage (for example, 2.6 V) applied through the third switch 323 is applied to the first comparator 341 and the second comparator 342, The first comparator 341 outputs a low level. Then, the second comparator 342 outputs a high level.

That is, the control unit 180 detects that the logic level applied to the first accessory detection terminal ACC_INT_FLOAT is low, and if the detection result is low, the ear- . When the ear-microphone is unplugged as described above, it becomes an idle state (S304).

The process of detecting the plugging of the ear-microphone 200 in the unplugged state, the process of checking whether the plugged ear-microphone is the pre-designated ear-microphone, the switching to the call mode when the ear- A process in which the microphone is unplugged in the call mode, a process in which the microphone is unplugged in a mode other than the call mode has been described.

6 is an exemplary diagram showing a logic tree for detecting a plugging or unplugging state of an ear-microphone according to the present invention.

As shown in the figure, when the micro USB socket 300 is in the idle state, 2.6 V is applied to the ID detection terminal 305, so that the first accessory detection terminal ACC_INT_FLOAT is detected as Low, 2 Access detection terminal (ACC_INT_GND) is high.

In the state where the earphone 200 is plugged, 0.015 V to 0.029 V is applied to the ID detection terminal 305, so that the first accessory detection terminal ACC_INT_FLOAT is detected as High, The terminal ACC_INT_GND is detected as low. When the plug-in of the earphone-microphone is detected and then checked again, 1.31 V to 1.97 V is applied to the ID detection terminal 305, so that the first accessory detection terminal ACC_INT_FLOAT is detected as High, 2 Accessory detection terminal (ACC_INT_GND) is also high. At this time, the ADC converter terminal (ADC) is woken up to check the voltage applied to the ID detection terminal 305.

When the end key or the send-key related to the telephone call function is input in the plugged-up microphone state as described above, since the ID detection terminal 305 is pulled down, 0 V is applied, 1 access detection terminal ACC_INT_FLOAT is detected as High and the second accessory detection terminal ACC_INT_GND is detected as Low.

In the case of unplugging while using a function other than the telephone call function, 2.6 V is applied to the ID detection terminal 305, the first accessory detection terminal ACC_INT_FLOAT is detected as Low, The terminal ACC_INT_GND is detected as High.

In the case of unplugging while using a function other than the telephone call function, 2.3 V is applied to the ID detection terminal 305, the first accessory detection terminal ACC_INT_FLOAT is detected as Low, The terminal ACC_INT_GND is detected as High.

7A and 7C are diagrams for explaining a method of determining a voltage for detecting a plugging or un-plugging state of an ear-microphone according to the present invention.

7A is an equivalent circuit composed of a first resistor 321 or a second resistor 323 connected to the third switch 323 and the internal resistance R2 of the microphone 213 connected to the ID detection terminal 305. [ Here, the voltage Vid of the ID detection terminal 305 is detected, and the range (Vmax to Vmin) of the detected voltage can be detected using FIG. 7B or FIG. 7C. Fig. 7B is a calculation formula when the ambient temperature is 25 ° C, and Fig. 7c is a calculation formula when the ambient LDO is 2% when the ambient temperature is -40 ° C or 85 ° C.

For example, the voltage range (for example, 1.31 V to 1.97 V) for checking the plugging of the ear-microphone 200 may be changed by LDO (Low Drop Output) or resistance variation. For example, following the LDO: 2%, resistance change: 1%, the voltage range for checking the plugging of the microphone can be changed from 1.254V to 2.019V.

The voltage range for each situation obtained using the above equation can be stored in the memory 160 in the form of a table.

In the foregoing, preferred embodiments of the present invention have been described with reference to the accompanying drawings.

Here, the terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings, but should be construed as meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It should be understood that various equivalents and modifications may be present.

1 is a block diagram of a mobile terminal according to an embodiment of the present invention;

2 is a block diagram illustrating a configuration of a mobile terminal having a micro USB interface according to the present invention;

3 is a flowchart illustrating a process of detecting a connection of an ear-microphone and performing a telephone conversation according to the present invention.

FIG. 4 is a flow chart illustrating a process for detecting unflooding of an earpiece during a call in accordance with the present invention. FIG.

FIG. 5 is a flow chart illustrating a process of detecting unfloating of an ear-microphone in a situation other than during a call according to the present invention;

FIG. 6 is an exemplary diagram showing a logic tree for detecting a plugging or unplugging state of an ear-microphone according to the present invention; FIG.

7A to 7C are diagrams for explaining a method of determining a voltage for detecting a plugging or un-plugging state of an ear-microphone according to the present invention;

Claims (10)

A socket including a first data transmission terminal connected to a first speaker of a microphone, a second data transmission terminal connected to a second speaker of the ear microphone, and an ID detection terminal connected to a microphone of the ear microphone; A switching unit switching either one of the first voltage and the second voltage to be applied to the ID detection terminal; Controls the switching unit to apply the first voltage to the ID detection terminal, And determines whether or not the ear microphone is connected based on a signal received through the ID detection terminal, A control unit for controlling the switching unit to apply the second voltage to the ID detection terminal so as to receive a signal from the microphone through the ID detection terminal when the use request for the microphone is applied while the ear microphone is connected / RTI > The socket according to claim 1, Wherein the socket is a micro-USB socket. delete The apparatus of claim 1, And a switch capable of applying a first voltage to an ID detection terminal through a first resistor or to apply a second voltage to an ID detection terminal through a second resistor. The mobile terminal of claim 1, And a plurality of comparators for detecting a logic level output from the ID detection terminal. 6. The apparatus of claim 5, A first comparator for outputting a low level L when the first voltage applied to the negative input terminal is greater than the reference voltage; And a second comparator for outputting a high (H) if a first voltage applied to a positive input terminal is greater than a reference voltage. The mobile terminal of claim 1, And a second switch for connecting a specific terminal of the socket to the AD converter to check a voltage output from the specific terminal, a first switch for connecting the ID detection terminal to the microphone terminal (MIC) The mobile terminal comprising: delete delete delete

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