TWI726885B - Audio device and multimedia device including audio device - Google Patents

Abstract

Disclosed is an audio device including an audio codec circuit connected to a first channel electrode, a second channel electrode, and a microphone detection electrode, and a jack detection circuit connected to a first channel detection electrode, a ground detection electrode, and the microphone detection electrode, and, in response to voltages of the first channel detection electrode and the ground detection electrode corresponding to a ground voltage, the jack detection circuit detects insertion of a jack, applies the ground voltage to the ground detection electrode, and applies a bias voltage to the microphone detection electrode.

Description

Audio device and multimedia device containing the audio device

The apparatus and method according to the exemplary embodiments relate to an electronic device, and more specifically, to an audio device and a multimedia device including the audio device.

Multimedia devices such as smart phones and smart pads can generate and play video data and audio data. The audio data can be played via speakers, or can be played via a personal playback unit (for example, earphones or headphones). When a multimedia device is not connected to a personal playback unit, it generally plays audio data through a speaker, and when a personal playback unit is connected, it plays audio data through the personal playback unit. For such functions, the multimedia device may include a plug detection circuit for detecting whether the plug of the personal playback unit is inserted into the plug slot. When the plug is coupled to the plug slot or separated from the plug slot, various noises may be generated, and these noises may be unintentionally played through the personal playback unit, thereby causing inconvenience to the user. Therefore, in order to further facilitate the user, there is a need for a plug that can be used to prevent unintentional The unit or method of the noise.

Exemplary embodiments provide an audio device for improving user convenience and a multimedia device including the audio device.

According to an aspect of an exemplary embodiment, an audio device is provided. The audio device includes: an audio codec circuit connected to a first channel electrode, a second channel electrode, and a microphone detection electrode; and a plug detection circuit connected to The first channel detection electrode, the ground detection electrode, and the microphone detection electrode, and in response to the voltage of the first channel detection electrode and the voltage of the ground detection electrode corresponding to the ground voltage, the plug detection The detection circuit detects the insertion of the plug, applies the ground voltage to the ground detection electrode, and applies a bias voltage to the microphone detection electrode.

According to an aspect of another exemplary embodiment, a multimedia device is provided. The multimedia device includes: an application processor; a random access memory; a storage device; Control and process video data; display for displaying video signals through the control of the video codec; plug slot for external plug insertion; audio codec connected to the first channel electrode in the plug slot , The second channel electrode and the microphone detection electrode are used to process audio data under the control of the application processor; and the plug detection circuit is connected to the first channel detection electrode and the ground detection electrode in the plug slot The measuring electrode and the microphone detection electrode, and in response to the voltage of the first channel detection electrode and the voltage of the ground detection electrode corresponding to the ground voltage, the plug detection circuit detects the insertion of the external plug In the plug slot, and applying the connection to the ground detection electrode Ground voltage, and apply a bias voltage to the microphone detection electrode.

According to another aspect of the exemplary embodiment, an audio device is provided. The audio device includes a logic gate circuit for responding to the voltage of the first channel detection electrode and the ground detection electrode in the plug slot. Ground voltage to output a first bit signal, and at least one of the voltage of the first channel detection electrode and the voltage of the ground detection electrode in the plug slot is the ground Voltage to output a second bit signal; a transistor for connecting the ground detection electrode to the ground node supplied with the ground voltage in response to the logic gate circuit outputting the first bit signal; and A bias voltage generator for generating a bias voltage in response to the first bit signal output from the logic gate circuit and applying the bias voltage to the microphone detection electrode in response to the logic gate circuit The second bit signal is output and the ground voltage is applied to the microphone detection electrode.

According to another aspect of the exemplary embodiment, a detection circuit is provided. The detection circuit includes: an OR logic gate for generating a logic signal according to the first channel detection electrode voltage and the ground detection electrode voltage, so The logic signal is one of a high voltage and a low voltage; a first transistor for selectively applying a ground signal to the microphone detection electrode according to the logic signal; and a second transistor for applying a ground signal to the microphone detection electrode according to the logic signal; The logic signal selectively applies the ground signal to the ground detection electrode.

10: Multimedia device

11: Application processor

12: Random access memory

13: storage device

14: Power management circuit

15: power supply

16: Video codec

17: display

18: camera

19: Audio codec

20: speaker

21: Microphone

22: Modem

23: Antenna

100, 100a, 100b, 100c: plug detector

200: plug slot

210: main body

220: first channel electrode

225: The first channel detection electrode

230: second channel electrode

240: Ground electrode

245: Ground detection electrode

255: Microphone detection electrode

300: plug

310: first pole

315: first insulator

320: second pole

325: second insulator

330: third pole

335: third insulator

340: The Fourth Pole

400: plug

410: first pole

415: first insulator

420: second pole

425: second insulator

430: third pole

BG: Bias voltage generating circuit

BIAS: Bias voltage

CP: Comparator/current path

CP2: second comparator

EN: Enabling signal

OR: logic gate circuit

OT: output terminal

OUT: output signal

PG: Pulse wave generating circuit

PUR1: first pull-up resistor

PUR2: second pull-up resistor

R1: first resistance

R2: second resistor

R3: third resistor

R4: Fourth resistor

R5: Fifth resistor

S110, S120, S130, S140, S150: steps

S210, S220, S230, S240, S250: steps

SG: signal generator

T1: the first point in time

T2: second time point

T3: The third time point

T4: The fourth time point

T5: Fifth time point

T6: The sixth time point

T7: Seventh time point

TR1: The first transistor

TR2: second transistor

TR3: third transistor

V1: first voltage

VDD: power supply voltage

VSS: Ground voltage

VREF: Reference voltage

The above and other purposes and features will become apparent by reading the following description in conjunction with the accompanying drawings. In the accompanying drawings:

FIG. 1 is a block diagram illustrating a multimedia device according to an exemplary embodiment.

Fig. 2 is an example of a plug of an external personal playback unit inserted into a plug slot according to an exemplary embodiment.

Fig. 3 is an example of a plug of an external personal playback unit inserted into a plug slot according to an exemplary embodiment.

FIG. 4 is a circuit diagram of a plug detector drawn according to an exemplary embodiment.

FIG. 5 is a flowchart of a method for detecting whether a plug is inserted into a plug slot according to an exemplary embodiment.

Fig. 6 illustrates the connection of a 3-pole jack inserted into or separated from the plug slot according to an exemplary embodiment.

FIG. 7 is a timing diagram of voltage changes involved in the plug detector according to an exemplary embodiment.

FIG. 8 is a circuit diagram of an application of a plug detector according to an exemplary embodiment.

Fig. 9 is a flowchart of a method for performing plug insertion according to an exemplary embodiment.

FIG. 10 is a timing diagram of voltage changes involved in the plug detector according to an exemplary embodiment.

FIG. 11 is a flowchart of the application of the plug detector according to an exemplary embodiment.

Hereinafter, exemplary embodiments will be explained with reference to the accompanying drawings. These exemplary embodiments are provided to make this disclosure content thorough and complete, and to familiarize yourself with this technique. The operator fully conveys the scope of the concept of the present invention. Therefore, although exemplary embodiments are described herein, the disclosed content should be regarded as including various modifications, equivalent forms, and/or alternative forms. For illustration purposes, the same reference numbers refer to the same elements.

The terms used herein are only used to illustrate exemplary embodiments, and are not intended to limit the concept of the present invention. When the term "including" is used in this specification, it refers to the existence of the stated features, integers, steps, operations, elements and/or components, but does not exclude one or more other features, integers, steps, operations, elements, The presence or addition of components and/or groups thereof.

In addition, it should be understood that although terms such as "first" and "second" may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or regions The paragraph should not be restricted by these terms. Therefore, the first element, component, region, layer or section discussed below may be referred to as a second element, component, region, layer or section without departing from the concept and teaching content of the present invention.

Unless otherwise defined, the meanings of all terms (including technical and scientific terms) used herein are the same as those commonly understood by those with ordinary knowledge in the technical field to which the concept of the present invention belongs. It should be understood that these terms (such as those defined in commonly used dictionaries) should be interpreted as having meanings consistent with their meanings in the context of related technologies, and unless clearly defined in this article, they should not be interpreted as having Ideal or too formal meaning. The term "and/or" as used herein includes any and all combinations of one or more of the related listed items. For example, expressions such as "at least one of" when appearing before a series of elements modify the entire series of elements, rather than modify individual elements in the series.

FIG. 1 is a block diagram illustrating a multimedia device 10 according to an exemplary embodiment. As an example, the multimedia device 10 may be included in a smart phone, a smart tablet computer, a smart TV, a tablet computer, a laptop computer, a personal digital assistant (PDA), a portable multimedia player Portable multimedia player (PMP), digital cameras, music players, portable game consoles, navigation systems and, for example, smart watches, wristband-type electronic devices, necklace-type electronic devices, glasses-type electronic devices And other wearable devices. 1, the multimedia device 10 may include an application processor 11, a random access memory 12, a storage device 13, a power management circuit 14, a power supply 15, a video codec 16, a display 17, a camera 18, and audio codec The device 19, the speaker 20, the microphone 21, the modem 22, the antenna 23, the plug detector 100 and the plug slot 200.

The application processor 11 can perform control functions for controlling the multimedia device 10, and can perform arithmetic functions for processing various data. The application processor 11 can execute an operating system and various applications.

The random access memory 12 can be used as the main memory unit of the application processor 11. For example, the random access memory 12 can store process codes and various data processed by the application processor 11. The random access memory 12 may include dynamic random access memory (Dynamic Random Access Memory, DRAM), static random access memory (Static RAM, SRAM), and phase-change random access memory (Phase-change RAM, PRAM). ), magnetic random access memory (Magnetic RAM, MRAM), ferroelectric random access memory (Ferroelectric RAM, FeRAM) or resistive random access memory (Resistive RAM, RRAM).

The storage device 13 can be used as an auxiliary memory unit of the application processor 11. For example, the storage device 13 may store the source code of various applications or the source code of the operating system, or various data generated by the application or the operating system stored for long-term storage purposes. The storage device 13 may include flash memory, phase change random access memory, magnetic random access memory, ferroelectric random access memory, or resistive random access memory.

The power management circuit 14 can distribute or supply power from the power supply 15 to various components of the multimedia device 10. The power management circuit 14 can adjust the amount of power to be allocated or supplied to the components of the multimedia device 10 according to the condition of the multimedia device 10 or the workload performed by the multimedia device 10. For example, the power management circuit 14 can control the power saving mode of the multimedia device 10 or the power saving mode of the components of the multimedia device 10.

The video codec 16 can generate or play video data. For example, the video codec 16 can encode the signal generated by the camera 18 to generate video data. The video codec 16 can decode the video data generated by the camera 18 or the video data stored in the storage device 13 or the random access memory 12, and can play the decoded video data through the display 17. For example, the display 17 may include a liquid crystal display (LCD), an organic light emitting diode (Organic Light Emitting Diode, OLED), an active matrix organic light emitting diode (Active Matrix OLED, AMOLED), a flexible Type display or electronic ink.

The audio codec 19 can generate or store audio data. For example, the audio codec 19 can encode the signal generated by the microphone 21 to generate audio data. The audio codec 19 can decode the audio data generated by the microphone 21 or the audio data stored in the storage device 13 or the random access memory 12, and can play the decoded audio data through the speaker 20.

The audio codec 19 can be connected to the plug detector 100 and the plug slot 200. The plug detector 100 can detect whether the plug of the external personal playback unit is inserted into the plug slot 200, and can provide the detection result to the audio codec 19 as the output signal OUT. If an external personal playback unit is inserted into the plug slot 200, the audio codec 19 can play audio data through the connected personal playback unit.

The plug detector 100 can detect whether the external personal playback unit inserted into the plug slot 200 includes a microphone. If the external personal playback unit includes a microphone, the audio codec 19 can generate audio data based on the signal received from the microphone of the external personal playback unit.

For example, the audio codec 19 and the plug detector 100 can be implemented in one semiconductor package. For example, the plug detector 100 can be included in the audio codec 19.

The modem 22 can communicate with external devices through the antenna 23. For example, the modem 22 can communicate with an external device based on at least one of the following multiple wireless communication modes: such as Long Term Evolution (LTE), WiMax, Global System for Mobile (GSM) communication , Code Division Multiple Access (CDMA), Bluetooth, Near Field Communication (NFC), WiFi, Radio Frequency Identification (RFID), etc.; or based on various wired communication modes, such as Universal Serial Bus (USB), serial advanced technology attached Connect (Serial AT Attachment, SATA), High Speed InterChip (HSIC), Small Computer System Interface (SCSI), Firewire, Peripheral Component Interconnection (PCI) , Fast peripheral component interconnection (PCI express, PCIe), fast non-volatile memory (NonVolatile Memory express, NVMe), universal flash storage (Universal Flash Storage, UFS), secure digital (Secure Digital, SD), security Digital input and output (SDIO), Universal Asynchronous Receiver Transmitter (UART), Serial Peripheral Interface (SPI), High Speed SPI (HS-SPI), RS232, internal integration Circuit (Inter-Integrated Circuit, I2C), High-speed internal integrated circuit (HS-I2C), Interchip Sound (I2S), Sony/Philips Digital Interface (S/PDIF) , MultiMedia Card (MultiMedia Card, MMC), Embedded Multimedia Card (embedded MMC, eMMC), etc.

FIG. 2 shows an example in which the plug 300 of the external personal playback unit is inserted into the plug slot 200. For example, FIG. 2 shows an exemplary insertion feature of a 4-pole plug 300.

1 and 2, the plug slot 200 may include a main body 210, a first channel electrode 220, a second channel electrode 230, a ground electrode 240, and a first channel detection electrode 225. The ground detection electrode 245 and the microphone detection electrode 255. The main body 210 may be formed in, for example, a case, a mold, or a frame of the multimedia device 10.

The first channel electrode 220 and the second channel electrode 230 can be connected to the audio codec 19. When the plug 300 is not coupled to the plug slot 200, the audio codec 19 can apply a power voltage to the first channel electrode 220 and the second channel electrode 230. When the plug 300 is coupled to the plug slot 200, the audio codec 19 can transmit the audio signal to the first channel electrode 220 and the second channel electrode 230, respectively.

The ground electrode 240 can be connected to the audio codec 19 or the plug detector 100, and can be connected to the ground node of the audio codec 19 or the plug detector 100. The ground node may be a node to which a ground voltage is supplied.

The first channel detection electrode 225 and the ground detection electrode 245 can be connected to the plug detector 100. The plug detector 100 can detect whether the plug 300 is coupled to the plug slot 200 based on the voltage of the first channel detection electrode 225 and the voltage of the ground detection electrode 245.

The microphone detection electrode 255 can be connected to the plug detector 100 and the audio codec 19. When the plug 300 is not coupled to the plug slot 200, the plug detector 100 can transmit the ground voltage to the microphone detection electrode 255. If it is detected that the plug 300 is inserted into the plug slot 200, the plug detector 100 can apply a bias voltage to the microphone detection electrode 255, and can thereby detect whether the personal playback unit inserted into the plug slot 200 includes a microphone. When it is determined that the personal playback unit inserted into the plug slot 200 does not include a microphone, the plug detector 100 can apply a ground voltage to the microphone detection electrode 255. When it is determined that the personal playback unit inserted into the plug slot 200 includes a microphone, the plug detector 100 The bias voltage can be continuously applied to the microphone detection electrode 255. The audio codec 19 can obtain audio data based on the voltage change of the microphone detection electrode 255.

For example, the plug 300 inserted into the plug slot 200 may include four poles 310, 320, 330, and 340. The first electrode 310 can receive the audio signal of the first channel, that is, the audio signal of the left channel from the first channel electrode 220. The second electrode 320 can receive the audio signal from the second channel electrode 230, that is, the audio signal of the right channel. The third pole 330 can receive the ground voltage from the ground electrode 240. The fourth pole 340 can transmit the audio signal to the audio codec 19 through the microphone detecting the electrode 255.

The first pole 310 and the second pole 320 can be electrically isolated from each other by the first insulator 315. The second pole 320 and the third pole 330 can be electrically isolated from each other by the second insulator 325. The third pole 330 and the fourth pole 340 can be electrically isolated from each other by the third insulator 335.

For example, the ground electrode 240 and the ground detection electrode 245 of the plug slot 200 may not be aligned in the plug slot 200. For example, due to processing errors or according to the definition in the specification, the ground detection electrode 245 and the ground electrode 240 may not be placed on the axis parallel to the first insulator 315, the second insulator 325, and the third insulator 335.

FIG. 3 shows an example in which the plug 400 of the external personal playback unit is inserted into the plug slot 200. For example, FIG. 3 shows an exemplary insertion feature of a 3-pole plug 400. The plug slot 200 shown in FIG. 3 has the same structure as the plug slot 200 shown in FIG. 2. Therefore, the description of the plug slot 200 will not be repeated.

For example, the plug 400 inserted into the plug slot 200 may include three poles 410, 420, and 430. The first electrode 410 can receive the first communication from the first channel electrode 220 The audio signal of the channel, for example, the audio signal of the left channel. The second electrode 420 can receive the audio signal of the second channel from the second channel electrode 230, for example, the audio signal of the right channel. The third pole 430 can receive the ground voltage from the ground electrode 240. Compared with the plug 300 shown in FIG. 2, the third pole 430 of the plug 400 can extend to a position corresponding to the fourth pole 340 of the plug 300 shown in FIG. 2. The plug 400 may not have a pole assigned to a microphone, and the personal playback unit connected to the plug 400 may not have a microphone.

The first pole 410 and the second pole 420 can be electrically isolated from each other by the first insulator 415. The second pole 420 and the third pole 430 can be electrically isolated from each other by the second insulator 425.

FIG. 4 is a circuit diagram of an application 100a of the plug detector 100 according to an exemplary embodiment. 2 to 4, the plug detector 100 may include a first resistor R1, a second resistor R2, a comparator CP, a first pull-up resistor PUR1, a logic gate circuit OR, a second pull-up resistor PUR2, a first voltage The crystal TR1, the signal generator SG and the bias voltage generating circuit BG.

The first resistor R1 and the second resistor R2 may be connected in series between the power node supplied with the power supply voltage VDD and the ground node supplied with the ground voltage. The voltage of the node between the first resistor R1 and the second resistor R2 may be the first voltage V1.

The comparator CP is configured to compare the first voltage V1 with the voltage of the first channel detection electrode 225. If the voltage of the first channel detection electrode 225 is equal to or higher than the first voltage V1, the comparator CP can output a high-level signal. If the voltage of the first channel detection electrode 225 is lower than the first voltage V1, the comparator CP can output a low-level signal. The output of the comparator CP can be passed to the logic gate circuit OR.

The pull-up resistor PUR1 can be connected between the power node and the first channel detection electrode 225. The pull-up resistor PUR1 can transmit the power supply voltage VDD to the first channel detection electrode 225, thereby making the voltage of the first channel detection electrode 225 equal to the power supply voltage VDD when the plug 300 or 400 is not coupled to the plug slot 200.

The logic gate circuit OR can perform an OR operation on the output of the comparator CP and the voltage of the ground detection electrode 245. The output of the logic gate circuit OR can be used as the output signal OUT and transmitted to the audio codec 19 via the output terminal OT. For example, when the output of the logic gate circuit is at a low level (that is, when the voltage of the first channel detection electrode 225 and the voltage of the ground detection electrode 245 are ground voltage or a low voltage close to the ground voltage), it can be detected It is detected that the plug 300 or 400 is coupled to the plug slot 200. When the output of the logic gate circuit OR is at a high level (that is, when at least one of the voltage of the first channel detection electrode 225 and the voltage of the ground detection electrode 245 is the power supply voltage or a positive voltage similar to the power supply voltage), It can be detected that the plug 300 or 400 is not coupled to the plug slot 200.

The first transistor TR1 can be connected between the microphone detection electrode 255 and the ground node supplied with a ground voltage, and can operate under the control of the logic gate circuit OR. When the output of the logic gate circuit OR is at a high level (ie, when the plug 300 or 400 is not coupled to the plug slot 200), the first transistor TR1 connects the ground electrode and the microphone detection electrode 255. That is, the ground voltage can be supplied to the microphone detection electrode 255. When the output of the logic gate circuit OR is at a low level (ie, when the plug 300 or 400 is coupled to the plug slot 200), the first transistor TR1 can be disconnected. That is, the voltage of the microphone detecting electrode 255 can be controlled by the bias voltage generating circuit BG.

The signal generator SG can output the enable signal EN. For example, when the output of the logic gate circuit OR is at a high level (ie, when the plug 300 or 400 is not coupled to the plug slot 200), the enable signal EN can be disabled. When the output of the logic gate circuit OR is at a low level (ie, when the plug 300 or 400 is coupled to the plug slot 200), the enable signal EN can be activated.

When the enable signal EN is enabled, the bias voltage generating circuit BG can supply the bias voltage BIAS to the microphone detecting electrode 255. When the enable signal EN is disabled, the bias voltage generating circuit BG can be disabled without outputting the bias voltage BIAS. For example, the bias voltage generating circuit BG can output a ground voltage.

The bias voltage generating circuit BG may include a second comparator CP2, a second transistor TR2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5.

The third resistor R3 and the fourth resistor R4 are connected in series between the second transistor TR2 and the ground node supplied with the ground voltage. The node between the third resistor R3 and the fourth resistor R4 may be connected to the positive input terminal of the second comparator CP2. The reference voltage VREF may be applied to the negative input terminal of the second comparator CP2.

The second transistor TR2 can be connected between the third resistor R3 and the power supply node to which the power supply voltage VDD is supplied. The second transistor TR2 can be controlled by the output of the second comparator CP2. The voltage at the node between the second transistor TR2 and the third resistor R3 may be the bias voltage BIAS. The bias voltage BIAS can be transmitted to the microphone detection electrode 255 through the fifth resistor R5. The bias voltage generating circuit BG can adjust the bias voltage BIAS so that the voltage of the node between the third resistor R3 and the fourth resistor R4 is equal to the reference voltage VREF.

FIG. 5 is a flowchart of a method for detecting whether the plug 300 or 400 is inserted into the plug slot 200 according to an exemplary embodiment.

2 to 5, in step S110, a ground voltage VSS is applied to the first channel electrode 220, the ground electrode 240, and the microphone detection electrode 255. For example, when the plug 300 is not inserted into the plug slot 200, the audio codec 19 may apply the ground voltage VSS to the first channel electrode 220, the second channel electrode 230, and the ground electrode 240. Since the output of the logic gate circuit OR of the plug detector 100 is high when the plug 300 is not inserted into the plug slot 200, the ground voltage VSS can be supplied to the microphone detection electrode 255 through the transistor TR1.

In step S120, if the plug 300 is coupled to the plug slot 200, the first channel electrode 220 can be connected to the first channel detection electrode 225 through the first electrode 310. Therefore, the voltage of the first channel detection electrode 225 can be reduced to the ground voltage VSS through the ground node of the first channel electrode 220. In addition, the ground detection electrode 245 can be electrically connected to the ground electrode 240 through the third electrode 330. Therefore, the voltage of the ground detection electrode 245 can be reduced to the ground voltage VSS by the ground node of the ground electrode 240. In this way, if the plug 300 is coupled to the plug slot 200, the voltage of the first channel detection electrode 225 and the voltage of the ground detection electrode 245 can be reduced to the ground voltage VSS, and the output signal OUT can be reduced to a low level. .

Since it is found that the plug 300 is not inserted into the plug slot 200 (unless the output signal OUT of the logic gate circuit OR is low), the detection operation will be terminated. If the output signal OUT of the logic gate circuit OR is at a low level, it can be detected that the plug 300 is inserted into the plug slot 200 in step S130. After this, the first transistor TR1 can be The microphone detecting electrode 255 is electrically isolated from the ground node, and the bias voltage generating circuit BG can transmit the bias voltage BIAS to the microphone detecting electrode 255.

In step S140, it can be determined that the voltage of the microphone detecting electrode 255 is lower than the bias voltage BIAS or lower than a voltage similar to the bias voltage BIAS at the position. For example, as shown in FIG. 3, when the 3-pole plug 400 is inserted into the plug slot 200, the microphone detection electrode 255 can be connected to the ground electrode through the third pole 430. Therefore, the voltage of the microphone detection electrode 224 can be reduced to a voltage lower than the bias voltage BIAS (that is, it can be reduced to the ground voltage VSS), and it can be detected that the personal playback unit does not have a microphone. As shown in FIG. 2, when the 4-pole plug 300 is inserted into the plug slot 200, the fourth pole 340 may be connected to the microphone of the personal playback unit. For example, the microphone may have a resistance ranging from 1.35 kiloohms (kΩ) to 33 kiloohms. The voltage of the microphone detection electrode 255 can be changed to the bias voltage BIAS set by dividing the voltage of the node between the third resistor R3 and the second transistor TR2 by using the fifth resistor R5 and the microphone resistor. Therefore, in step S150, it can be detected that the personal playback unit has a microphone.

For example, if it is detected that the personal playback unit has a microphone, the bias voltage generating circuit BG can continuously transmit the bias voltage BIAS to the microphone detecting electrode 255. The microphone of the personal player unit can use the bias voltage to obtain an audio signal. The obtained audio signal can be expressed in the voltage change of the microphone detecting electrode 255.

FIG. 6 illustrates the connection state when the 3-pole plug 400 is inserted into the plug slot 200 or separated from the plug slot 200. 6, the ground electrode 240 and the ground detection electrode 245 It is not aligned in the plug slot 200. Therefore, the ground electrode 240 is not electrically connected to the plug 400 at a position aligned with the second insulator 425. The ground detection electrode 245 and the microphone detection electrode 255 can be connected to the third electrode 430. In this state, the current path CP can be formed by the third pole 430 between the ground detection electrode 245 and the microphone detection electrode 255, and the voltage of the third pole 430 can depend on the voltage of the ground detection electrode 245 and the microphone Detect the voltage of the electrode 255.

FIG. 7 shows a timing diagram of voltage changes involved in the plug detector 100 in the connection state shown in FIG. 6. 5, 6 and 7, the plug slot 200 and the 3-pole plug 400 may be connected to each other as shown in FIG. 6. The first channel detection electrode 225 can be connected to the power node through the first pull-up resistor PUR1. Therefore, as shown before the first time point T1, when the plug 400 is not inserted into the plug slot 200, the voltage of the first channel detection electrode 225 may be the power supply voltage VDD. As shown in FIG. 6, if the first channel detection electrode 225 is connected to the first channel electrode 220 through the first electrode 410, the voltage of the first channel detection electrode 225 can be as shown at the first time point T1 Since the ground voltage VSS is supplied to the first channel electrode 220, it is reduced to the ground voltage VSS.

The ground detection electrode 245 can be connected to the power node through the second pull-up resistor PUR2. Therefore, when the plug 400 is not inserted into the plug slot 200, the voltage of the ground detection electrode 245 may be the power supply voltage VDD as shown before the first time point T1. As shown in FIG. 6, if the ground detection electrode 245 is connected to the microphone detection electrode 255 through the third pole 430, the voltage of the ground detection electrode 245 can be as shown at the first time point T1 due to the microphone detection. The ground voltage VSS of the measuring electrode 255 is reduced to the ground voltage VSS by the turned-on first transistor TR1.

When the plug 400 is not inserted into the plug slot 200, the voltage of the first channel detection electrode 225 and the voltage of the ground detection electrode 245 can be changed to the power supply voltage VDD or a voltage similar to the power supply voltage VDD. Therefore, as shown before the first time point T1, the comparator CP can output an output signal with a high level and the logic gate circuit OR can output an output signal OUT with a high level. When the plug 400 is inserted into the plug slot 200 as shown in FIG. 6, the voltage of the first channel detection electrode 225 and the voltage of the ground detection electrode 245 can be reduced to the ground voltage VSS or a voltage similar to the ground voltage VSS. Therefore, as shown at the first time point T1, the comparator CP can output the low-order signal and the logic gate circuit OR can output the low-order output signal OUT.

When the plug 400 is not inserted into the plug slot 200, the output signal OUT may be in the high position as shown before the first time point T1. Therefore, the first transistor TR1 can connect the ground node to the microphone detection electrode 255, and the voltage of the microphone detection electrode 255 can become the ground voltage VSS as shown before the first time point T1. If the output signal OUT changes from a high level to a low level as shown at the first time point T1, the enable signal EN can be activated. Therefore, at the second time point T2, the transistor TR1 can be turned off and the bias voltage generating circuit BG can output the bias voltage BIAS. Therefore, the voltage of the microphone detection electrode 255 can increase from the ground voltage VSS.

If the voltage of the microphone detection electrode 255 increases from the ground voltage VSS at the second time point T2, thereafter, at the third time point T3, the third electrode 430 is connected to the ground detection of the microphone detection electrode 255 The voltage of the electrode 245 may also increase due to the current path CP. For example, the voltage of the ground detection electrode 245 can be increased to the bias voltage BIAS supplied from the microphone detection electrode 255, through the second pull-up resistor The power supply voltage VDD supplied by PUR2 or an intermediate voltage between the bias voltage BIAS and the power supply voltage VDD.

If the voltage of the ground detection electrode 245 increases, the output signal OUT of the logic gate circuit OR can change from a low level to a high level at the third time point T3. If the output signal OUT transitions to a high level, the first transistor TR1 can be turned on and the bias voltage generating circuit BG can be disabled. Therefore, at the fourth time point T4, the voltage of the microphone detection electrode 255 can be reduced to the ground voltage VSS.

As the voltage of the microphone detecting electrode 255 decreases to the ground voltage VSS, at the fifth time point T5, the voltage of the ground detecting electrode 245 can also decrease to the ground voltage VSS. The output signal OUT of the logic gate circuit OR can change from a high level to a low level at the fifth time point T5. At the sixth time point T6, the first transistor TR1 can be turned off and the bias voltage generating circuit BG can output the bias voltage BIAS. Therefore, the voltage of the microphone detection electrode 255 can increase from the ground voltage VSS to the bias voltage BIAS at the sixth time point T6.

As the voltage of the microphone detection electrode 255 increases to the bias voltage BIAS, at the seventh time point T7, the voltage of the ground detection electrode 245 may increase.

As shown in FIG. 7, in the case where the ground detection electrode 245 and the microphone detection electrode 255 are short-circuited and the ground electrode 240 is floating as shown in FIG. 6, the output signal OUT of the logic gate circuit OR can be between the high position and the low position. Periodically change from time to time. Although the output signal OUT changes periodically, the voltage of the third electrode 430 may change with the change of the ground detection electrode 245 or the microphone detection electrode 255.

The personal playback unit can be based on the electrical connection between the first pole 410 and the third pole 430 The audio signal of the first channel is played based on the voltage difference, and the audio signal of the second channel can be played based on the voltage difference between the second pole 420 and the third pole 430. As shown in FIG. 7, if the voltage of the third pole 430 changes periodically, interference noise can be periodically generated and heard by the personal playback unit.

Therefore, an exemplary embodiment may apply a ground voltage to the ground detection electrode 245 after detecting the insertion of the plug 400.

FIG. 8 is a circuit diagram of an application 100b of the plug detector 100 shown in FIG. 4. 8, the plug detector 100b may include a first resistor R1, a second resistor R2, a comparator CP, a first pull-up resistor PUR1, a logic gate circuit OR, a second pull-up resistor PUR2, a first transistor TR1, The signal generator SG, the bias voltage generating circuit BG and the third transistor TR3. Compared with the plug detector 100 shown in FIG. 4, the plug detector 100b may further include a third transistor TR3. The common components of the plug detector 100 shown in FIG. 4 and the plug detector 100b shown in FIG. 8 will not be described in detail below.

The third transistor TR3 can be connected between the ground detection electrode 245 and the ground node to which the ground voltage is supplied, and can be controlled by the bias voltage BIAS. If the bias voltage generating circuit BG is enabled (for example, the second transistor TR2 is turned on) to output the bias voltage BIAS (which is the power supply through the second transistor TR2, the third resistor R3, and the fourth resistor R4). If the voltage VDD is divided to generate a positive voltage), the third transistor TR3 can be turned on. Subsequently, the ground node can be connected to the ground detection electrode 245. If the bias voltage generating circuit BG is disabled (for example, the second transistor is turned off) to output the ground voltage transmitted by the third resistor R3 and the fourth resistor R4, the third transistor TR3 can be turned off. Subsequently, the ground node can be self-grounded from the ground detection electrode 245 isolation.

FIG. 9 shows a flowchart of a method for performing plug insertion in the plug detector 100b shown in FIG. 8. 8 and 9, in step S210, the ground voltage may be supplied to the first channel electrode 220, the ground electrode 240, and the microphone detection electrode 255. Step S210 can be performed in the same manner as step S110 in FIG. 5.

In step S220, it can be determined whether the output signal OUT of the logic gate circuit OR is low. Step S220 can be performed in the same manner as step S120 in FIG. 5.

If the output signal OUT of the logic gate circuit OR is at a high level, the plug insertion can not be detected and the procedure can be terminated. If the output signal OUT of the logic gate circuit OR is low, the plug insertion can be detected and step S230 can be executed.

In step S230, since plug insertion is detected, the bias voltage BIAS can be applied to the microphone detection electrode 255, and the ground voltage VSS can be applied to the ground detection electrode 245. For example, the bias voltage generating circuit BG can be enabled to apply the bias voltage BIAS to the microphone detection electrode 255. The third transistor TR3 can be turned on by the bias voltage BIAS to transmit the ground voltage VSS to the ground detection electrode 245.

In step S240, it can be determined whether the voltage of the microphone detecting electrode 255 is lower than the bias voltage BIAS. Step S240 can be performed in the same manner as step S140 in FIG. 5.

If the voltage of the microphone detecting electrode 255 is lower than the bias voltage BIAS, the microphone may not be detected and the procedure may be terminated. If the microphone detects the electricity of electrode 255 If the voltage is similar to the bias voltage BIAS, the microphone can be detected in step S250. Step S250 can be performed in the same manner as step S150 in FIG. 5.

FIG. 10 is a timing diagram of voltage changes involved in the plug detector 100b of FIG. 8 in the connection state shown in FIG. 6. 6, 8 and 10, at the first time point T1, if the 3-pole plug 400 is coupled to the plug slot 200 as shown in FIG. 6, the voltage of the first channel detection electrode 225 can be derived from the power supply The voltage VDD is reduced to the ground voltage VSS. The voltage of the ground detection electrode 245 can be reduced from the power supply voltage VDD to the ground voltage VSS. Therefore, the output signal OUT of the logic gate circuit OR can be changed from a high level to a low level. Subsequently, the insertion of the plug 400 can be detected.

At the second time point T2, the first transistor TR1 can be turned off and the bias voltage generating circuit BG can output the bias voltage BIAS. Therefore, the voltage of the microphone detection electrode 255 can be increased from the ground voltage VSS to the bias voltage BIAS. In addition, the third transistor TR3 can be turned on by the bias voltage BIAS, and the ground detection electrode 245 can be connected to the ground node. Therefore, although the voltage of the microphone detection electrode 255 is increased to the bias voltage BIAS, the voltage of the ground detection electrode 245 can still be maintained at the ground voltage VSS.

Subsequently, from the third time point T3 to the seventh time point T7, the voltage of the ground detection electrode 245 can be maintained at the ground voltage. Therefore, as described above in conjunction with FIG. 7, the voltage of the third pole 430 of the plug 400 can be prevented from changing, thereby preventing noise. Therefore, user convenience can be improved.

FIG. 11 is a circuit diagram of an application 100c of the plug detector 100b shown in FIG. 8. 11, the plug detector 100c may include a first resistor R1, a second resistor R2, a comparator CP, a first pull-up resistor PUR1, a logic gate circuit OR, and a second resistor R2. The pull-up resistor PUR2, the first transistor TR1, the signal generator SG, the bias voltage generating circuit BG, and the third transistor TR3. Compared with the plug detector 100b shown in FIG. 8, the plug detector 100c may further include a pulse wave generating circuit PG. The third transistor TR3 can be controlled by replacing the bias voltage BIAS with the output pulse of the pulse generating circuit PG.

Referring to FIG. 11, the pulse wave generating circuit PG is constructed to output a pulse signal in response to the enable signal EN. For example, the pulse wave generating circuit PG can output a pulse signal that changes from low to high when the enable signal EN is enabled, and from high to low after the duty time. . For example, the working time may be equal to or longer than the time used to detect whether the personal playback unit includes a microphone. For example, the working time may be the time used to detect the microphone.

If the output pulse wave of the pulse wave generating circuit PG changes from a low level to a high level, the third transistor TR3 can be turned on. Therefore, similar to the connection state shown in FIG. 6, the ground detection electrode 245 can be connected to the ground node, and the voltage of the ground detection electrode 245 can be prevented from changing with the voltage of the microphone detection electrode 255. If the output pulse wave of the pulse wave generating circuit PG changes from a high level to a low level after the detection of the microphone is over, the third transistor TR3 can be disconnected. Subsequently, the ground detection electrode 245 can be isolated from the ground node, and the second pull-up resistor PUR2 connected to the ground detection electrode 245 acts on it. For example, if the plug 400 is separated from the plug slot 200, the voltage of the ground detection electrode 245 can be increased to the power supply voltage VDD by the second pull-up resistor PUR2 and the power node. That is, if the second pull-up resistor PUR2 acts on it, the ground detection electrode 245 can detect that the plug 400 is separated from the plug slot 200.

The above-mentioned exemplary embodiment is provided for full explanation and 3-pole plug 400 and 4-pole plug 300 related technical concepts. However, the exemplary embodiment is not limited to the described 3-pole plug 400 and 4-pole plug 300, but can be widely applied to n-pole plugs (n is a positive integer).

According to various exemplary embodiments, even if the ground detection electrode and the microphone detection electrode are short-circuited when the plug is coupled to or separated from the plug groove, the generation of noise can still be prevented.

Although various exemplary embodiments have been described, it will be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the concept of the present invention. Therefore, it should be understood that the above-described exemplary embodiments are not restrictive, but illustrative.

10‧‧‧Multimedia device

11‧‧‧Application Processor

12‧‧‧Random access memory

13‧‧‧Storage device

14‧‧‧Power Management Circuit

15‧‧‧Power Supply

16‧‧‧Video Codec

17‧‧‧Display

18‧‧‧Camera

19‧‧‧Audio Codec

20‧‧‧Speaker

21‧‧‧Microphone

22‧‧‧Modem

23‧‧‧antenna

100‧‧‧Plug detector

200‧‧‧Plug slot

OUT‧‧‧Output signal

Claims (19)

An audio device includes: an audio codec circuit connected to the first channel electrode, the second channel electrode and the microphone detection electrode; the plug detection circuit is connected to the first channel detection electrode, the ground detection electrode and the Microphone detection electrode; a ground node, where a ground voltage is applied; and a transistor, connected between the ground detection electrode and the ground node, which corresponds to the voltage of the first channel detection electrode and the ground The voltage of the detection electrode corresponds to the ground voltage, and the plug detection circuit detects the insertion of the plug to apply the ground voltage to the ground detection electrode by operating the transistor and apply a bias Voltage is applied to the microphone detection electrode. The audio device according to the first item of the patent application, wherein the transistor is used to operate in response to the bias voltage. The audio device described in claim 2, wherein the plug detection circuit includes the transistor. The audio device described in the first item of the patent application, wherein the transistor is used to operate in response to a pulse signal. The audio device described in item 4 of the scope of patent application further includes a pulse wave generating circuit for responding to the voltage of the first channel detecting electrode and the voltage corresponding to the ground detecting electrode The pulse signal is activated at the ground voltage, and the pulse signal is deactivated after a duty time. The audio device described in claim 4, wherein the plug detection circuit includes the transistor. According to the audio device described in claim 1, wherein the plug detection circuit includes a comparator for if the first channel voltage of the first channel detection electrode is equal to or higher than the first voltage, Output a high level, and if the first channel voltage is lower than the first voltage, output a low level; and a first pull-up resistor connected to the first channel detection electrode and the power node to which the power supply voltage is supplied between. According to the audio device described in claim 7, wherein the plug detection circuit further includes: a logic gate circuit for performing or based on the output of the comparator and the voltage of the ground detection electrode Operation; and a second pull-up resistor connected between the ground detection electrode and the power node. According to the audio device described in claim 8, wherein the plug detection circuit detects the plug in response to the output of the logic gate circuit becoming low. According to the audio device described in item 8 of the scope of patent application, the plug detection circuit further includes: a second transistor for detecting the microphone electrode in response to the output of the logic gate circuit being high. Connected to the ground node, and in response to the logic gate The output of the circuit is low level and isolates the microphone detection electrode from the ground node. As for the audio device described in item 8 of the scope of patent application, the plug detection circuit further includes: a bias voltage generating circuit for generating a bias voltage in response to the output of the logic gate circuit being low. The bias voltage is transferred to the microphone detection electrode. The audio device described in claim 11, wherein the transistor is used to operate in response to a pulse signal, and the pulse signal is generated in response to the output of the logic gate circuit being the low level . A multimedia device includes: an application processor; a random access memory; a storage device; a video codec for processing video data under the control of the application processor; a display for using the video codec The decoder is controlled to display the video signal; the plug slot is for external plugs to be inserted; the audio codec is connected to the first channel electrode, the second channel electrode and the microphone detection electrode in the plug slot for The application processor controls and processes audio data; a plug detection circuit is connected to the first channel detection electrode in the plug slot, The ground detection electrode and the microphone detection electrode; a ground node to which a ground voltage is applied; and a transistor connected between the ground detection electrode and the ground node, which corresponds to the first channel detection The voltage of the electrode and the voltage of the ground detection electrode correspond to the ground voltage, and the plug detection circuit detects that the external plug is inserted into the plug slot to apply the A ground voltage is applied to the ground detection electrode, and a bias voltage is applied to the microphone detection electrode. The multimedia device described in claim 13, wherein the audio codec and the plug detection circuit are implemented in a semiconductor package. The multimedia device according to item 13 of the scope of patent application, wherein the multimedia device includes at least one of a smart phone, a smart tablet computer, a smart TV, a smart watch, and a wearable device. An audio device includes: a logic gate circuit for outputting a first bit signal in response to the voltage of the first channel detection electrode in the plug slot and the voltage of the ground detection electrode being the ground voltage, and responding to the plug At least one of the voltage of the first channel detection electrode and the voltage of the ground detection electrode in the groove is not the ground voltage and outputs a second bit signal; a transistor for responding Outputting the first bit signal in the logic gate circuit to connect the ground detection electrode to the ground node supplied with the ground voltage; and A bias voltage generator for generating a bias voltage in response to the first bit signal output from the logic gate circuit and applying the bias voltage to the microphone detection electrode in response to the logic gate circuit The second bit signal is output and the ground voltage is applied to the microphone detection electrode. In the audio device described in claim 16, wherein the transistor is used to operate in response to the bias voltage. The audio device described in item 16 of the scope of patent application further includes a pulse wave generating circuit for generating a pulse wave signal in response to the output of the logic gate circuit and outputting the first bit signal . The audio device according to claim 16, wherein the plug slot includes a first channel electrode, a second channel electrode, and a ground electrode, and the audio device further includes an audio codec circuit, and the audio codec The device circuit is used for outputting audio signals through the first channel electrode, the second channel electrode and the ground electrode, and receiving the audio signal through the microphone detecting electrode.

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