WO2020251210A1

WO2020251210A1 - Electronic device including connector and method for reducing crosstalk of audio signal

Info

Publication number: WO2020251210A1
Application number: PCT/KR2020/007210
Authority: WO
Inventors: 류희준
Original assignee: 삼성전자 주식회사
Priority date: 2019-06-10
Filing date: 2020-06-03
Publication date: 2020-12-17
Also published as: KR20200141299A

Abstract

An electronic device according to various embodiments comprises: a communication interface connected to an audio device through a USB type C connector including a plurality of terminals; an audio codec connected to the communication interface; and a processor operationally connected to the communication interface and the audio codec, wherein the processor detects the insertion of the audio device through the USB type C connector, and during the insertion of the audio device, when at least one configuration channel (CC) terminal from among the plurality of terminals is connected to a ground detection terminal of the audio device, the processor controls the communication interface so as to connect the CC terminal connected to the ground detection terminal of the audio device to the audio codec, and the audio codec may be configured to sense a ground voltage of the audio device on the basis of the CC terminal connected to the ground detection terminal of the audio device, and to amplify an audio signal on the basis of the sensed ground voltage.

Description

Electronic device including connector and method for reducing crosstalk of audio signals

The present invention relates to an electronic device including a connector and a method for reducing crosstalk of an audio signal based on a USB type C connector.

Connectors that can be wired to external devices such as electronic devices, speakers, audio jacks, and connection ports are commercially available in various forms. These connectors are standardized by various standard methods. Among the various standards, the most widely used standard is the universal serial bus (USB) method. Recently, the type C of universal serial bus (USB), which can provide data, video, audio and power through a single connector, is growing rapidly.

The electronic device may transmit and receive audio signals with an external device through a USB Type C interface. When an electronic device is connected to an audio device to transmit and receive an audio signal, the quality of the audio signal may be degraded due to crosstalk between left and right channels, that is, channel signal interference. The crosstalk phenomenon of the audio signal may be caused by a parasitic capacitance of an adjacent structure of the left/right channels or a common ground impedance of the left/right channels.

According to an embodiment, the electronic device is a USB type C connector and an electronic device that improves the quality of an audio signal by improving the accuracy of sensing for a common ground impedance that is a difference between the ground of the ear jack and the ground of the electronic device. For example, to provide a method for reducing crosstalk of an audio signal based on this.

According to various embodiments, in an electronic device, a communication interface connected to an audio device through a USB type C connector including a plurality of terminals, an audio codec connected to the communication interface, and the communication interface and the audio codec are operational. And a processor connected to each other, wherein the processor detects the insertion of an audio device through the USB type C connector, and when the audio device is inserted, at least one CC (Configuration Channel) terminal among the plurality of terminals is connected to the audio device. When connected to the ground detection terminal of the audio device, the communication interface is controlled so that the CC terminal connected to the ground detection terminal of the audio device is connected to the audio codec, and the audio codec is based on the CC terminal connected to the ground detection terminal of the audio device. It may be configured to sense a ground voltage of the device and amplify an audio signal based on the sensed ground voltage.

According to various embodiments, an operation of detecting insertion of an audio device through a USB type C connector including a plurality of terminals, and at least one CC (Configuration Channel) terminal among a plurality of terminals when the audio device is inserted Based on the operation of checking whether it is connected to the ground detection terminal of the device, controlling the CC terminal connected to the ground detection terminal of the audio device to be connected to the audio codec, and the CC terminal connected to the ground detection terminal of the audio device. An operation of sensing a ground voltage and an operation of amplifying an audio signal based on the sensed ground voltage may be included.

According to various embodiments, when connecting an audio device through a connector, at least one of the CC terminals of the connector is connected to the ground detection terminal of the audio device, and the audio codec senses the ground voltage based on the CC terminal connected to the ground detection terminal of the audio device. By doing so, it is possible to increase the output performance of an audio signal by minimizing audio crosstalk interference.

1 is a block diagram of an electronic device in a network environment according to various embodiments of the present disclosure.

2A is a diagram illustrating an electronic device and a communication interface according to various embodiments, and FIG. 2B is a diagram illustrating a pin structure of a USB port according to various embodiments.

3A is a diagram illustrating an electronic device and a connector according to various embodiments, and FIG. 3B is a diagram illustrating a connection structure between the electronic device and the connector.

4 illustrates a structure of an electronic device according to various embodiments.

5 illustrates a method for preventing crosstalk of an audio signal according to various embodiments.

6 illustrates a method for preventing crosstalk of an audio signal according to various embodiments.

7A to 7C illustrate a structure of a connection line between a connector and an audio jack according to various embodiments.

8A and 8B illustrate circuit configurations of an electronic device and a connector according to various embodiments.

9A and 9B illustrate circuit configurations of an electronic device and a connector according to various embodiments.

10 is a diagram illustrating circuit configurations of an electronic device and a connector according to various embodiments of the present disclosure.

11 illustrates a method for preventing crosstalk of an audio signal according to various embodiments.

12 illustrates a circuit configuration of an electronic device according to various embodiments.

13 illustrates a method for preventing crosstalk of an audio signal according to various embodiments.

Various embodiments of the present invention disclosed in the present specification and drawings are merely provided with specific examples to easily describe the technical content of the present invention and to aid understanding of the present invention, and are not intended to limit the scope of the present invention. Therefore, the scope of the present invention should be construed that all changes or modified forms derived based on the technical idea of the present invention in addition to the embodiments disclosed herein are included in the scope of the present invention.

The electronic device 101 according to various embodiments disclosed in this document may be a device of various types. The electronic device 101 may include, for example, a portable communication device (eg, a smartphone), a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance. The electronic device 101 according to the exemplary embodiment of the present document is not limited to the above-described devices.

1 is a block diagram of an electronic device 101 in a network environment 100 according to various embodiments.

Referring to FIG. 1, in a network environment 100, the electronic device 101 communicates with the electronic device 102 through a first network 198 (eg, a short-range wireless communication network), or a second network 199 It is possible to communicate with the electronic device 104 or the server 108 through (eg, a long-distance wireless communication network). According to an embodiment, the electronic device 101 may communicate with the electronic device 104 through the server 108. According to an embodiment, the electronic device 101 includes a processor 120, a memory 130, an input device 150, an audio output device 155, a display device 160, an audio module 170, and a sensor module ( 176, interface 177, haptic module 179, camera module 180, power management module 188, battery 189, communication module 190, subscriber identification module 196, or antenna module 197 ) Can be included. In some embodiments, at least one of these components (for example, the display device 160 or the camera module 180) may be omitted or one or more other components may be added to the electronic device 101. In some embodiments, some of these components may be implemented as one integrated circuit. For example, the sensor module 176 (eg, a fingerprint sensor, an iris sensor, or an illuminance sensor) may be implemented while being embedded in the display device 160 (eg, a display).

The processor 120, for example, executes software (eg, a program 140) to implement at least one other component (eg, a hardware or software component) of the electronic device 101 connected to the processor 120. It can be controlled and can perform various data processing or operations. According to an embodiment, as at least part of data processing or operation, the processor 120 may convert commands or data received from other components (for example, the sensor module 176 or the communication module 190) into a volatile memory. ) 132, process commands or data stored in the volatile memory 132, and store result data in a non-volatile memory 134. According to an embodiment, the processor 120 is a main processor 121 (for example, a central processing unit (CPU) or an application processor (AP)), and a coprocessor that can be operated independently or together. 123 (e.g., a graphic processing unit (GPU), an image signal processor (ISP), a sensor hub processor, or a communication processor (CP)). I can. Additionally or alternatively, the coprocessor 123 may be set to use lower power than the main processor 121 or to be specialized for a designated function. The secondary processor 123 may be implemented separately from the main processor 121 or as a part thereof.

The coprocessor 123 is, for example, on behalf of the main processor 121 while the main processor 121 is in an inactive (eg, sleep) state, or the main processor 121 While in an active (eg, application execution) state, together with the main processor 121, at least one of the components of the electronic device 101 (eg, display device 160, sensor module 176) ), or at least some of functions or states related to the communication module 190). According to an embodiment, the coprocessor 123 (eg, an image signal processor or a communication processor) may be implemented as part of another functionally related component (eg, the camera module 180 or the communication module 190). have.

The memory 130 may store various data used by at least one component of the electronic device 101 (for example, the processor 120 or the sensor module 176 ). The data may include, for example, software (eg, the program 140) and input data or output data for commands related thereto. The memory 130 may include a volatile memory 132 or a nonvolatile memory 134.

The program 140 may be stored as software in the memory 130, and may include, for example, an operating system (OS) 142, a middleware 144, or an application 146. have.

The input device 150 may receive commands or data to be used for components of the electronic device 101 (eg, the processor 120) from outside the electronic device 101 (eg, a user). The input device 150 may include, for example, a microphone, a mouse, a keyboard, or a digital pen (eg, a stylus pen).

The sound output device 155 may output an sound signal to the outside of the electronic device 101. The sound output device 155 may include, for example, a speaker or a receiver. The speaker can be used for general purposes such as multimedia playback or recording playback, and the receiver can be used to receive incoming calls. According to an embodiment, the receiver may be implemented separately from or as a part of the speaker.

The display device 160 may visually provide information to the outside of the electronic device 101 (eg, a user). The display device 160 may include, for example, a display, a hologram device, or a projector and a control circuit for controlling the device. According to an embodiment, the display device 160 includes a touch circuitry set to sense a touch, or a sensor circuit set to measure the strength of a force generated by the touch (for example, a pressure sensor). It may include.

The audio module 170 may convert sound into an electric signal or, conversely, convert an electric signal into sound. According to an embodiment, the audio module 170 acquires sound through the input device 150, the sound output device 155, or an external device directly or wirelessly connected to the electronic device 101 (for example, an electronic device). The sound can be output through the device 102) (for example, speakers or headphones).

The sensor module 176 detects an operating state (eg, power or temperature) of the electronic device 101, or an external environmental state (eg, a user state), and generates an electrical signal or data value corresponding to the detected state. can do. According to an embodiment, the sensor module 176 is, for example, a gesture sensor, a gyro sensor, a barometer sensor, a magnetic sensor, an acceleration sensor. ), grip sensor, proximity sensor, color sensor (e.g. RGB (red, green, blue) sensor), IR (infrared) sensor, biometric sensor, temperature A sensor (temperature sensor), a humidity sensor (humidity sensor), or an illumination sensor (illuminance sensor) may be included.

The interface 177 may support one or more designated protocols that may be used to directly or wirelessly connect to an external device (eg, the electronic device 102) of the electronic device 101. According to an embodiment, the interface 177 may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, a secure digital (SD) card interface, or an audio interface.

The connection terminal 178 may include a connector through which the electronic device 101 can be physically connected to an external device (eg, the electronic device 102). According to an embodiment, the connection terminal 178 may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (eg, a headphone connector).

The haptic module 179 may convert an electrical signal into a mechanical stimulus (eg, vibration or movement) or an electrical stimulus that the user can perceive through tactile or motor sensations. According to an embodiment, the haptic module 179 may include, for example, a motor, a piezoelectric element, or an electrical stimulation device.

The camera module 180 may capture a still image and a video. According to an embodiment, the camera module 180 may include one or more lenses, image sensors, image signal processors, or flashes.

The power management module 188 may manage power supplied to the electronic device 101. According to an embodiment, the power management module 188 may be implemented as, for example, at least a part of a power management integrated circuit (PMIC).

The battery 189 may supply power to at least one component of the electronic device 101. According to an embodiment, the battery 189 may include, for example, a non-rechargeable primary cell, a rechargeable secondary cell, or a fuel cell.

The communication module 190 includes a direct (eg, wired) communication channel or a wireless communication channel between the electronic device 101 and an external electronic device (eg, electronic device 102, electronic device 104, or server 108). It is possible to support establishment and communication through the established communication channel. The communication module 190 operates independently of the processor 120 (eg, an application processor), and may include one or more communication processors that support direct (eg, wired) communication or wireless communication. According to an embodiment, the communication module 190 is a wireless communication module 192 (eg, a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module 194 (eg : A LAN (local area network) communication module, or a power line communication module) may be included. Among these communication modules, a corresponding communication module is a first network 198 (for example, a short-range communication network such as Bluetooth, Wi-Fi direct or IrDA (infrared data association)) or a second network 199 (for example, a cellular network, the Internet. , Or a computer network (eg, a long-distance communication network such as a LAN or a wide area network (WAN)) to communicate with an external electronic device. These various types of communication modules may be integrated into one component (eg, a single chip), or may be implemented as a plurality of separate components (eg, multiple chips).

The wireless communication module 192 uses the subscriber information (eg, international mobile subscriber identity (IMSI)) stored in the subscriber identification module 196 to communicate with the first network 198 or the second network 199. The electronic device 101 can be identified and authenticated within the same communication network.

The antenna module 197 may transmit a signal or power to the outside (eg, an external electronic device) or receive from the outside. According to an embodiment, the antenna module 197 may include one antenna including a conductor formed on a substrate (eg, a PCB) or a radiator formed of a conductive pattern. According to an embodiment, the antenna module 197 may include a plurality of antennas. In this case, at least one antenna suitable for a communication method used in a communication network such as the first network 198 or the second network 199 is, for example, provided by the communication module 190 from the plurality of antennas. Can be chosen. The signal or power may be transmitted or received between the communication module 190 and an external electronic device through the at least one selected antenna. According to some embodiments, other components (eg, RFIC) other than the radiator may be additionally formed as a part of the antenna module 197.

At least some of the components are connected to each other through a communication method (e.g., bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI))) between peripheral devices, and signal (E.g. commands or data) can be exchanged with each other.

According to an embodiment, a command or data may be transmitted or received between the electronic device 101 and the external electronic device 104 through the server 108 connected to the second network 199. Each of the

electronic devices

102 and 104 may be a device of the same or different type as the electronic device 101.

According to an embodiment, all or part of the operations executed by the electronic device 101 may be executed by one or more of the external

electronic devices

102, 104, or 108. For example, when the electronic device 101 needs to perform a function or service automatically or in response to a request from a user or another device, the electronic device 101 does not execute the function or service by itself. In addition or in addition, it is possible to request the one or more external

electronic devices

102 and 104 to perform the function or at least part of the service. The one or more external

electronic devices

102 and 104 that have received the request execute at least a part of the requested function or service, or an additional function or service related to the request, and transmit the execution result to the electronic device 101. I can deliver. The electronic device 101 may process the result as it is or additionally and provide it as at least a part of a response to the request. For this, for example, cloud computing, distributed computing, or client-server computing technology may be used.

FIG. 2A is a diagram illustrating an electronic device and a communication interface according to various embodiments, and FIG. 2B is a diagram illustrating a pin structure of a USB port according to various embodiments.

2A and 2B, the electronic device 101 according to an embodiment includes a first surface (or front surface) 210, a second surface (or rear surface) 211, and a first surface and a second surface. It may include a housing including a side surface 212 surrounding the space between the surfaces. In another embodiment (not shown), the housing includes a first surface 210, a second surface 211 and side surfaces 212. It may refer to a structure that forms part of it. The electronic device 101 according to an embodiment may be implemented as, for example, a smartphone or a tablet PC, but is not limited thereto.

The electronic device 101 according to an embodiment includes a display 220 (eg, the display device 160 of FIG. 1 ), a speaker hole 230 and a connector port 240 (eg, the interface 177 of FIG. 1 ), The connection terminal 178 of FIG. 1 may be included. Although not shown in the drawings, the electronic device 101 may additionally include or at least some of the components illustrated in FIG. 1 in addition to the display 220, the speaker hole 230, and the connector port 240.

The display 220 according to an embodiment may be exposed through, for example, a portion of the first surface 210. The speaker hole 230 may include at least one external speaker hole and a call receiver hole. In some embodiments, the speaker hole 230 and the microphone hole may be implemented as a single hole, or a speaker (eg, piezo speaker) implemented without a speaker hole may be included.

The connector port 240 according to an embodiment may be formed in a structure in which, for example, a connector (or connector cable) for transmitting and receiving power and/or data with an external device can be inserted. The electronic device 101 may be connected to an external device (or an accessory device) through a connector inserted into the connector port 240, and power and/or data (for example, audio data, multimedia data, or other Control commands, etc.) can be transmitted and received. The connector port 240 according to an embodiment may have a structure in which a USB Type C connector can be inserted, but is not limited thereto.

According to an embodiment, the connector port 240 includes an opening formed on one surface of a housing and a hole connected to the opening, and a connection terminal capable of being connected to the connector end of the connector ( 241) can be arranged.

As shown in FIG. 2A, the connector port 240 may be disposed on the lower side of the electronic device 101, but the location of the connector port 240 is not limited thereto, and the other side of the electronic device 101 May be placed in.

According to an embodiment, the connection terminals 241 inside the connector port 240 may be arranged in a reversible structure. For example, the connection terminals 241 are connected to each other in a first direction perpendicular to a direction in which the connector is inserted (eg, from the bottom to the top of the electronic device 101) and a second direction opposite to the first direction. It can be symmetric.

Hereinafter, the structure of the connection terminals of the connector port of the USB type C standard will be described. 2B, the connector port 240 of the electronic device 101 may be formed according to the USB Type C standard. The connector port 240 may include a plurality of connection terminals 241 defined in the USB Type C standard.

According to an embodiment, the connection terminals 241 of the USB type C standard may have 12 terminals on the A line and the B line, respectively, and may be symmetrical to each other. The line electrically connected between the connection terminals 241 of the connector port 240 and the connector terminals may differ depending on the direction in which the USB connector is inserted.

According to an embodiment, the CC1 (configuration channel 1) and CC2 (configuration channel 2) terminals may be used as ports for detecting connector insertion/removal and identifying the connector connection mode. For example, when the electronic device 101 and an external device are connected through a connector, an electrical signal (eg, digital ID or resistance ID) is exchanged through the CC1 and CC2 terminals, and accordingly, the electronic device 101 And insertion or removal of an external device may be detected. The electronic device 101 operates in a connector connection mode in a downstream facing port (DFP) mode, an upstream facing port mode (UFP), a power supply mode, and/or an audio accessory mode based on a value detected by at least one of CC1 and CC2. Can be controlled to do.

According to an embodiment, GND (ground) (eg, A1/B12, B1/A12) and VBUS terminals (eg, A4/A9, B4/B9 terminals) may be ports used as power lines. For example, the VBUS terminal may be used to supply power from the electronic device 101 to an external device connected through a connector.

According to an embodiment, TX1+/-, TX2+/-, RX1+/- and RX2+/- terminals (e.g., A2/A3, B2/B3, B11/B10 and A11/A10 stages) are high-speed data according to USB type C. It can be used as a port for communication. For example, when a dedicated accessory device that can directly transmit/receive digital signal PCM data is connected to the connector port 240, PCM data is transmitted through the TX1+/-, TX2+/-, RX1+/- and RX2+/- terminals. You can send and receive.

According to an embodiment, the role of each terminal in various operation modes is defined by the USB Type C standard, and a more detailed description of the role of each terminal will be omitted.

According to an embodiment, the D+ and D- terminals (eg, A6/B6 and A7/B7 terminals) may be ports used to transmit and receive data (eg, USB packets).

According to an embodiment, when the electronic device 101 is connected to an audio device, the A6/B6 terminal (D+) may transmit either a left audio signal (L) or a right audio signal (R), and the A7/B7 terminal In (D-), the other one of the left audio signal L or the right audio signal R may be transmitted. The L/R audio signal may be an analog signal.

According to an embodiment, the functions of the sideband unit (SBU) 1 and SBU2 terminals (A8 and B8 terminals) are not specified, but may be used to support unique functions for each electronic device.

According to an embodiment, when the electronic device 101 is connected to an audio device, the SBU1 and SBU2 terminals may be used for microphone and ground detection purposes. For example, when the connector is inserted in the first direction, the SBU1 terminal may be connected to the microphone terminal of the audio device and the SBU2 terminal may be connected to the ground terminal of the audio device. For another example, when the connector is inserted in the second direction, the SBU1 terminal may be connected to the ground terminal of the audio device, and the SBU2 terminal may be connected to the microphone terminal of the audio device.

According to an embodiment, when the electronic device 101 is connected to an audio device, at least one of the CC1 and CC2 terminals may be used as a port connected to the ground detection terminal of the audio jack.

According to an embodiment, when the electronic device 101 is connected to an audio device, at least one of the CC1 and CC2 terminals may be used as a port connected to at least one of the first detection line and the second detection line of the audio codec.

3A and 3B, the electronic device 101 according to an embodiment may be connected to an external device, for example, an audio device 360 through a connector 103. The connector 103 may be a connector according to a universal serial bus (hereinafter referred to as USB) standard. For example, the connector 103 may be a USB Type C connector, but is not limited thereto, and includes a high definition multimedia interface (HDMI), a recommended standard 232 (RS-232), power line communication, or a plain old telephone service (POTS). It can be applied to wired interfaces of various standard standards or non-standard wired interfaces. For example, the connector 103 may include a C-type plug 341 and an audio jack 342 connected to the audio device 360, but connected to other accessory devices other than the audio device 360. It may further include a jack connected to a port or other type of plug.

According to an embodiment, the audio plug of the audio device 360 is inserted into the audio jack 342 of the connector 103, and the audio device 360 may be connected to the electronic device 101 through the connector 103. . The electronic device 101 detects that the audio device 360 is connected through the connector 103 and the CC1 terminal and the CC2 terminal (CC terminal and Vconn terminal) of the connector port, and the connector 103 operates in the audio accessory mode. Can be recognized to do.

In the audio accessory mode, the audio codec 345 may sense a ground voltage of an audio jack through a sensing terminal of the audio codec 345 and process an audio signal based on the sensed ground voltage. The audio signal is output to the ground terminal of the audio jack as a reference point and transmitted to the sensing terminal of the audio codec 345. Here, a difference between the ground voltage recognized by the L/R terminal side of the audio jack and the ground voltage sensed by the sensing terminal side of the audio codec 345 (eg, ground impedance) occurs, and the sensing voltage difference As a result, crosstalk may be deteriorated. Such crosstalk may be changed by a semiconductor device (eg, PCB, Contact, Soldering, Passive device) or a current return disposed between the ground terminal of the audio jack and the sensing terminal of the audio codec 345. A difference in crosstalk interference may occur according to a sensing position at which the codec 345 recognizes the ground voltage of the audio jack.

For example, FIG. 3B is a connection structure between the electronic device 101 and the connector 103. In order to explain the difference in sensing voltage according to the sensing position of the ground voltage in the electronic device 101, the electronic device 101 This example assumes that the audio codec 345 senses the ground voltage at the VGR1 position 304, the VGR2 position 303, the VGR3 position 302, and the VGR4 position 301. It is obvious that FIG. 3B is shown for convenience of description and does not correspond to the configuration of the present invention.

As shown in FIG. 3B, the sensing voltage (Vsensing 1) at the VGR1 position 304 becomes ImA x (R _AGND1 +R _AGND2 +R _AGND3 +R _AGND4 )Ω, and the sensing voltage at the VGR2 position 303 (Vsensing 2) becomes ImA x (R _AGND2 +R _AGND3 +R _AGND4 )Ω. The sensing voltage (Vsensing 3) at VGR3 position (302) becomes ImA x (R _AGND3 +R _AGND4 )Ω, and the sensing voltage (Vsensing 4) at VGR4 position (301) becomes ImA x (R _AGND4 )Ω. I can. Comparing the sensing voltage, it can be seen that the sensing voltage difference occurs as the impedance increases as the distance from the audio jack's ground terminal location (eg, 304) increases. That is, when the audio codec 345 senses the ground voltage, sensing at a position (eg, 304) on the ground terminal side of the audio jack rather than the connector port position (eg, 301) of the electronic device 101 is left/right. It can be seen that the common ground voltage of the channel can be sensed more accurately.

In general, according to the USB Type C standard, it is recommended that the audio ground (eg, AGND) be connected from the ground terminal (eg, DGND) of the connector port of an electronic device in the audio accessory mode. Also, in the USB Type C standard, there is no connection terminal for sensing the ground voltage of the audio jack, so it can be implemented to sense the ground voltage of the audio jack at the connector port when manufacturing an electronic device, and sense the ground voltage of the audio jack from the connector port. Crosstalk performance may deteriorate due to structural problems. Accordingly, in the case of an electronic device having a USB type C connector, a method of minimizing crosstalk degradation is required.

According to an embodiment of the present invention, when the electronic device 100 is connected to the audio device 360 through the connector 103, at least one of the CC terminals is connected to the ground detection terminal (G-detection) of the audio device 360. When connected, the audio codec 345 senses the ground voltage of the audio device based on the CC terminal connected to the ground detection terminal of the audio device 360, and adds the sensed ground voltage to the audio signals output to the left/right, Crosstalk caused by a difference in ground voltage with the device 360 may be minimized.

4 illustrates a structure of an electronic device according to various embodiments. .

Referring to FIG. 4, the electronic device 101 according to an embodiment may include a processor 410, a communication interface 430, and an audio codec 440. The electronic device 101 may further include a memory (not shown), but is not limited thereto, and may include the components of FIG. 1 or at least some of them.

The electronic device 101 according to an embodiment may further include a DP controller 450 in addition to the processor 410, the communication interface 430, and the audio codec 440. When the electronic device includes the DP controller 450, the DP controller 450 may be connected to the SBU1_H and SBU2_H terminals of the switching circuit 135, and detects a Hot Plug Detect (HPD) signal for supporting Display Port Alt Mode. It can support the function that transmits HEAC±(HDMI Ethernet and Audio Return Channel) signals.

The communication interface 430 may include a connector port 431, a switching circuit 435 for changing a signal path corresponding to the connector connection mode, and a CC circuit 437.

According to an embodiment, the connector port 431 may include a plurality of connection terminals. A plurality of connection terminals of the connector port 431 may be electrically connected to the switching circuit 435. The connector port 431 may be formed in a structure in which the connector 103 of an external device is physically and electrically connected. The structure of the connection terminal of the connector port 431 has been described above in FIG. 2B, and thus will be omitted.

According to an embodiment, the switching circuit 435 may include a plurality of switches to support functions according to the connector connection mode. For example, the switching circuit 435 may include at least some of a USB/Audio switch, a MIC/AGND/AUX/SBU_SENSE switch, and a CC/CC_SENSE switch. The switching circuit 435 may be implemented such that the signal path of the electronic device 101 is changed through switches in response to the connector connection mode under the control of the processor 410.

According to an embodiment, the switching circuit 435 may include a CC1 switch, a CC2 switch, and a CC_SENSE switch so that the CC sensing line is connected to the CC circuit 437 or selectively connected to the sensing line of the audio codec. The switching circuit 435 is controlled by the processor 410, when the electronic device 101 is connected to the ground detection terminal of the audio device, the CC sensing line is connected to the sensing line of the audio codec, and the audio codec is connected to the ground detection terminal of the audio device. It may be implemented to detect the ground voltage based on.

According to an embodiment, the CC circuit 437 detects insertion/detachment of the connector 103, detection of a plug insertion direction, and a connector connection mode based on signals recognized from CC terminals (eg, CC1 terminal and CC2 terminal). Can be identified. The CC circuit 437 may recognize a situation related to a connector based on a signal input through at least one of a CC1 terminal and a CC2 terminal included in the connector port 431 and transmit it to the processor 410.

According to an embodiment, the CC circuit 437 may sense impedance sensing of the G detection terminal and the L detection terminal of the audio device based on the CC1 and CC2 terminals and distinguish between a ground and a load. According to an embodiment, the CC circuit 437 connects/disconnects between a Downstream Facing Port (DFP) and an Upstream Facing Port (UFP) from signals recognized at CC1 and CC2 terminals (eg, inserting a connector 103 or an external device). /Separation) can be recognized.

According to an embodiment, the CC circuit 437 may recognize the connection direction of the connector 103 from signals recognized at the CC1 and CC2 terminals. The CC1 and CC2 terminals can be toggled to H/L periodically to check the connector 103 recognition direction and function, and at this time, the current sourcing method and resistor pull-up method can be defined to create the H section. have.

According to an embodiment, the CC circuit 437 determines the role of the host (source) and the device (sink) in the relationship between the electronic device 101 and the external device from signals recognized at the CC1 and CC2 terminals. And can detect the power supplier. For example, the role of the host and the device is determined in a host-only mode in which one CC terminal is used as a host (DFP), a device-only mode in which one CC terminal is used as a device (UFP), and any one CC terminal. May be both modes used as both host and device modes. For example, the CC circuit 437 is a host that provides power through a PD (power delivery) method in which the host can provide the most power to the device from signals recognized at the CC1 and CC2 terminals, and receives the power. Device role can be determined.

According to an embodiment, the CC circuit 437 may determine the USB type C VBUS current capacity as a specific value (eg 1.5 A or 3A) based on resistance values recognized at the CC1 and CC2 terminals.

According to an embodiment, the processor 410 may control components of the electronic device 101 and/or perform an operation or data processing related to communication. The processor 410 may be connected to the audio codec 440, the CC circuit 437, and the switching circuit 435, and the connector port 431 and the connector 103 are switched to perform an operation related to the connected external device. The circuit 435 and the audio codec 440 can be controlled. The memory (not shown) may store instructions such as various arithmetic and logical operations, data movement, and control instructions such as input/output, which can be performed by the processor 410, and operations of the processor 410 to be described later are memory. This can be done by loading instructions stored in.

According to an embodiment, the processor 410 detects that the audio device is connected based on signals input from the CC circuit 437 through the CC1 terminal and the CC2 terminal, and the switching circuit 435 according to the connector connection mode. The signal path inside can be controlled to be switched.

According to an embodiment, the processor 410 may control switching of the switching circuit 435 according to an external device connected through the connector 103, a type of a connector plug, or a connector connection mode. The connector connection mode may include at least one of a downstream facing port (DFP) mode, an upstream facing port (UFP) mode, a first audio accessory mode, a second audio accessory mode, a power supply mode, and a data transmission mode.

According to an embodiment, when the audio device is connected through the connector 103, the processor 410 is connected to the ground detection terminal of the audio device when at least one of the CC1 terminal and the CC2 terminal is connected to the ground detection terminal of the audio device. The switching circuit 435 may be controlled to connect the CC terminal to the audio codec.

According to an embodiment, the processor 410 detects that both of CC1 and CC2 are less than the pull-down resistance value, the resistance value of one terminal is sensed to be less than a set threshold (eg, 1Ω), and the other When the terminal is detected exceeding the set threshold, the CC terminal (eg, CC1) whose resistance value is less than the set threshold value is cut off the connection with the CC circuit 437, and is connected to the sensing line of the audio codec 440. Switch to be connected, and another terminal (eg, CC2) exceeding a set threshold value can be switched to recognize the load value of the audio jack and connect the Vconn terminal and the CC circuit 437 of the connector 103 .

According to an embodiment, when an audio device is connected, the processor 410 may control the audio codec 440 to transmit/receive an audio signal through the connector 103.

According to an embodiment, the audio codec 440 may encode an analog audio signal into a digital signal into a digital signal and decode the digital signal into an analog audio signal under the control of the processor 410. The audio codec 440 may generate an L/R channel audio signal, and transmit the L/R channel audio signal to the D+ terminal and the D- terminal of the connector 103 through the switching circuit 435.

The audio codec 440 includes a first amplifier that amplifies the L audio signal and a second amplifier that amplifies the R audio signal, and based on the ground impedance voltage value sensed through the sensing line of the audio codec, L/R audio Can amplify the signal.

According to an embodiment, the audio codec 440 may sense a ground voltage of an audio device based on a CC terminal connected to a ground detection terminal of the audio device, and amplify an audio signal based on the sensed ground voltage.

According to an embodiment, the audio codec 440 includes a left sound line, a right sound line, a microphone line, and a sensing line for sensing the ground voltage, a first detection line selectively connected to the CC1 terminal, and a CC2 terminal. It may include at least one of the second detection lines.

According to an embodiment, the sensing line of the audio codec 440 is selectively connected to a CC terminal connected to a ground detection terminal of an audio device among CC terminals, or selectively connected to at least one of a sideband unit (SBU) terminal 1 and an SBU2 terminal. Can be connected.

According to an embodiment, the connector 103 inserted into the connector port 431 of the electronic device 101 includes a plurality of connector terminals that can be physically and electrically connected to the connection terminals included in the connector port 431. Can include. For example, the connector 103 may be a USB type C connector or a USB type C connector cable. The USB type C connector cable may include at least one of a USB type C plug, an audio jack, and/or a USB type C earphone.

According to one embodiment, the connector 103 is the G detection end and the L The detection terminal may be electrically connected and connected to the CC terminal and the Vconn terminal of the connector 103.

According to an embodiment, when the G detection terminal of the audio jack is connected to one of the CC terminal and the Vconn terminal, the L detection terminal may be connected to the other terminal not connected to the G detection terminal. have.

Referring to FIG. 5, a processor of the electronic device 101 according to an embodiment (for example, the processor 120 of FIG. 1, the processor 410 of FIG. 4) is Device insertion (eg audio plug insertion) can be detected. For example, the electronic device may be connected to an audio device based on a USB Type C connector (eg, the connector 103 of FIG. 4 ).

According to an embodiment, the processor may receive information on contact signals of CC terminals based on the CC circuit of FIG. 4, detect insertion of a connector connected to an audio device, and recognize a connector connection mode.

According to an embodiment, when a resistance recognized by at least one of CC1 and CC2 is pulled down, the processor (or CC circuit) may detect that an external device is connected through a connector. When the external device is an audio device such as headphones, earphones, and speakers, both of the CC1 and CC2 terminals (or CC and Vconn terminals) can be designed to be recognized as less than 1.2kΩ when connected to an electronic device. The processor can recognize that the audio device has been inserted if the recognized resistance in both CC1 and CC2 is less than or equal to 1.2kΩ.

In operation 520, the processor may determine an audio accessory mode type with an audio device connected to the connector.

According to an embodiment, the processor may identify whether at least one of CC1 and CC2 is connected to the audio jack ground of the audio device while the resistance is recognized in the range of 1.2 kΩ or less in both CC1 and CC2. .

For example, the processor recognizes that the resistance recognized at one of the CC1 and CC2 terminals in contact with the CC and Vconn terminals of the connector is below a set threshold (e.g., 1Ω), and the resistance recognized by the other is set Example: 1Ω), the CC terminal of the connector can be recognized as a structure connected to the audio jack ground (eg, the first audio accessory mode). When the audio jack ground is connected to the CC terminal of the connector, in operation 530, the processor may switch to be connected to the sensing line of the audio codec and any one CC terminal for the first audio accessory mode.

For example, in the case of the first audio accessory mode, the processor sets a signal line to be connected to the ground detection terminal of the audio jack and the sensing line of the audio codec. Switching, and the other CC terminal can be controlled to switch the signal line so that the Vconn terminal of the connector and the CC circuit are connected to recognize a load value of the audio jack. That is, in the case of the first audio accessory mode, one terminal of CC1 and CC2 may be connected to the CC logic, and the other terminal may be connected to the audio codec.

In operation 540, the processor may perform an audio function with an audio device connected to the electronic device based on the audio signal path changed according to the switching.

According to one embodiment, the processor has a structure in which the CC terminal of the connector is not connected to the audio jack ground when both the CC1 and CC2 terminals in contact with the CC and Vconn terminals of the connector exceed a set threshold (for example, 1Ω). Example: Second audio accessory mode).

When the audio jack ground is not connected to the CC terminal of the connector, in operation 540, the processor may maintain the second audio accessory mode or switch the sensing line of the audio codec to connect one SBU terminal. According to an embodiment, the second audio accessory mode may be a functional mode with an audio device connected according to a preset logic. The second audio accessory may be logic defined in the USB Type C standard. For example, when manufacturing an electronic device, a default mode may be the second audio accessory mode. In the second audio accessory mode, CC1 and CC2 may be connected to a CC circuit, and at least one of SBU1 and SBU2 terminals of a connector port may be connected to a sensing port of an audio codec to be connected to a ground detection terminal of an audio jack.

For another example, in the second audio accessory mode, the processor may switch at least one of the SBU1 and SBU2 terminals of the connector port to be connected to the sensing port of the audio codec.

Claims

A communication interface connected to the audio device through a USB type C connector including a plurality of terminals;

An audio codec connected to the communication interface; And

And a processor operatively connected to the communication interface and the audio codec,

The processor,

When the insertion of an audio device is detected through the USB type C connector, and when at least one of the plurality of terminals is connected to the ground detection terminal of the audio device when the audio device is inserted, the audio device Control the communication interface so that the CC terminal connected to the ground detection terminal is connected to the audio codec,

The audio codec is configured to sense a ground voltage of an audio device based on a CC terminal connected to a ground detection terminal of the audio device, and amplify an audio signal based on the sensed ground voltage.
The method of claim 1,

The processor,

When the communication interface is configured to operate in a first audio accessory mode when any one of the CC terminals is connected to the ground detection terminal of the audio device, and the CC terminals are not connected to the ground detection terminal of the audio device An electronic device configured to operate in a second audio accessory mode.
The method of claim 2,

In the first audio accessory mode, the audio codec senses a ground voltage of the audio device based on a CC terminal connected to a ground detection terminal of the audio device,

In the second audio accessory mode, the audio codec is connected to the ground of the electronic device through a sideband unit (SBU) terminal to sense a ground voltage.
The method of claim 3,

The audio codec,

The electronic device configured to have a structure in which the sensing line for sensing the ground voltage is connected to a CC sensing line using a CC terminal or an SBU sensing line using an SBU terminal according to a connector connection mode with an audio device.
The method of claim 1,

Further comprising a CC circuit connected to the communication interface,

The processor,

Controlling another CC terminal connected to the L detection terminal of the audio device among the CC terminals of the communication interface to be connected to the CC circuit, and separation of the audio device based on another CC terminal connected to the L detection terminal of the audio device An electronic device set up to detect whether or not.
The method of claim 1,

The communication interface,

A connector port including a plurality of terminals;

A switching circuit connected to at least a portion of the plurality of terminals and determining a signal path corresponding to a connector connection mode; And

The electronic device further comprises a CC circuit configured to detect connector insertion/detachment detection, plug insertion direction detection, and connector connection mode based on signals recognized from CC terminals among the plurality of terminals.
The method of claim 6,

The CC circuit,

Check the resistance value recognized from the CC terminals,

When the resistance value of the CC terminals is detected to be less than or equal to the pull-down resistance value, it recognizes that the audio device has been recognized,

When the resistance value of the CC terminals is sensed below the pull-down resistance value, one terminal is sensed below the set threshold value, and the other terminal is sensed beyond the set threshold value, the resistance value is below the set threshold value. Recognizes as the first audio accessory mode that senses the ground voltage based on the detected CC terminal,

When the resistance values of the CC terminals are detected to be less than the pull-down resistance value and all of the CC terminals are detected exceeding the set threshold, the second audio accessory mode is recognized as sensing a ground voltage based on a sideband unit (SBU) terminal. An electronic device configured to transmit accessory mode information recognized by the processor.
The method of claim 7,

The CC circuit,

An electronic device configured to detect disconnection of the audio device when a resistance value measured at any one of CC terminals exceeds the pull-down resistance value when operating in the first accessory mode.
The method of claim 5,

The processor,

An electronic device configured to change a signal path of a communication interface to a default mode when the audio device connected to the USB type C connector is disconnected.
The method of claim 5,

The switching circuit,

The CC1 line and the CC2 line of the CC logic are respectively connected to a pull-down resistor,

The first detection line and the second detection line of the audio codec are connected to the first CC terminal and the second CC terminal of the communication interface, the electronic device configured to be connected to the audio device.
The method of claim 10,

The processor,

Switching the first CC terminal connected to the ground detection terminal of the audio device among the CC terminals to be connected to the sensing line of the audio codec,

Switching so that the CC1 line and the CC2 line of the CC circuit are connected to a pull-down resistor, respectively, and the first CC and second CC terminals are disconnected from the CC circuit,

Switching so that the first CC terminal and the second CC terminal are connected to the first detection line and the second detection line of the audio codec,

An electronic device configured to detect separation of the audio device based on the first detection line and the second detection line of the audio codec.
The method of claim 11,

The audio codec,

When the voltage measured at the first CC terminal or the second CC terminal connected to the ground detection terminal of the audio device through the first detection line and the second detection line is higher than a set threshold voltage, it is set to detect that the audio device is disconnected. Electronic device.
The method of claim 1,

The USB type C connector,

Ground detection that includes a USB type C plug and a connection jack for at least one external device, and when the connection jack is an audio jack, at least one of the CC and Vconn terminals of the USB type C plug measures the ground impedance of the audio jack An electronic device set up in a structure connected to the stage.
The method of claim 13,

The USB type C connector,

An electronic device configured in a structure in which the G detection terminal and the L detection terminal of the audio jack are electrically connected to the CC terminal and the Vconn terminal of the connector.
The method of claim 13,

In the USB type C connector, when the G detection terminal of the audio jack is connected to one of the CC terminal and the Vconn terminal, the L detection terminal is one of the structures connected to the other terminal not connected to the G detection terminal. .