TW201724875A - 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 including the same

An apparatus and method in accordance with an illustrative embodiment is directed to an electronic device and, more particularly, 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 material can be played via a speaker or can be played via a personal playback unit (eg, a headset or a headset). The multimedia device generally plays the audio data via the speaker when the personal playback unit is not connected, and plays the audio data through the personal playback unit when the personal playback unit is connected. For such functions, the multimedia device can include a plug detection circuit for detecting whether a 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 the noise 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 unit or method that can be used to prevent unintentional noise when the plug is coupled to the plug slot or separated from the plug slot.

The exemplary embodiment provides an audio device for improving user convenience and a multimedia device including the audio device.

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

According to another aspect of the exemplary embodiments, a multimedia device is provided, the multimedia device includes: an application processor; a random access memory; a storage device; a video codec, configured by the application processor Controlling and processing video data; display for displaying video signals by control of the video codec; plug slot for external plug insertion; audio codec connecting to first channel electrode in the plug slot a second channel electrode and a microphone detecting electrode for processing audio data by control of the application processor; and a plug detecting circuit connected to the first channel detecting electrode and the ground detecting in the plug slot a detecting electrode and the microphone detecting electrode, wherein the plug detecting circuit detects the external plug insertion according to a voltage of the first channel detecting electrode and a voltage of the ground detecting electrode corresponding to a ground voltage In the plug slot, the ground voltage is applied to the ground detecting electrode, and a bias voltage is applied to the microphone detecting electrode.

According to another aspect of the exemplary embodiment, an audio device is provided. The audio device includes: a logic gate circuit for detecting a voltage of a first channel detecting electrode and a ground detecting electrode voltage in the plug slot. And outputting a first bit signal to the ground voltage, and at least one of the voltage of the first channel detecting electrode and the voltage of the ground detecting electrode in the plug slot is the ground And outputting a second bit signal; the transistor is configured to connect the ground detecting electrode to the ground node to which the ground voltage is supplied according to the logic gate circuit outputting the first bit signal; a bias voltage generator for generating a bias voltage according to the logic gate circuit outputting the first bit signal and applying the bias voltage to the microphone detecting electrode, and corresponding to the logic gate circuit The second bit signal is output to apply the ground voltage to the microphone detecting electrode.

According to another aspect of the exemplary embodiment, a detection circuit is provided. The detection circuit includes: or a logic gate for generating a logic signal according to the first channel detection electrode voltage and the ground detection electrode voltage. 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 detecting electrode according to the logic signal; and a second transistor for The ground signal is selectively applied to the ground detecting electrode by a logic signal.

Hereinafter, the illustrative embodiments will be explained in conjunction with the drawings. The exemplified embodiments are provided so that this disclosure will be thorough and complete, and the scope of the inventive concept will be fully conveyed by those skilled in the art. Accordingly, the present disclosure is to be considered as being inclusive of various modifications, equivalents and/or alternative forms. In the description of the figures, the same reference numerals refer to the same elements.

The terminology used herein is for the purpose of illustration and description of the embodiments The use of the term "comprising", when used in this specification, refers to the presence of the recited features, integers, steps, operations, components and/or components, but does not exclude one or more other features, integers, steps, operations, components, The presence or addition of components and/or groups thereof.

In addition, it will be understood that, although the terms "first", "second", and the like may be used to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or regions Segments should not be restricted by these terms. Therefore, a first element, component, region, layer or section that is discussed below may be referred to as a second element, component, region, layer or section, without departing from the inventive concept.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning meaning meaning It should be further understood that these terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the related art, and should not be construed as having Idealized or overly formal meaning. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items. For example, "at least one of", etc., when applied before a series of elements, is an element that modifies the entire series, and does not modify the individual elements of the series.

FIG. 1 is a block diagram illustrating a multimedia device 10 in accordance with an exemplary embodiment. As an example, the multimedia device 10 can be included in a smart phone, a smart tablet, a smart TV, a tablet computer, a laptop, a personal digital assistant (PDA), and a portable multimedia player. Portable multimedia player (PMP), digital camera, music player, portable game console, navigation system and, for example, smart watch, wristband electronic device, necklace type electronic device, glasses type electronic device Any wearable device. Referring to FIG. 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 an audio codec. The device 19, the speaker 20, the microphone 21, the data machine 22, the antenna 23, the plug detector 100 and the plug slot 200.

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

The random access memory 12 can be used as a main memory unit of the application processor 11. For example, the random access memory 12 can store a process code processed by the application processor 11 and various materials. The random access memory 12 may include a dynamic random access memory (DRAM), a static random access memory (SRAM), a phase change random access memory (Phase-change RAM, PRAM). ), magnetic random access memory (MRAM), ferroelectric random access memory (Ferroelectric RAM, FeRAM) or resistive random access memory (Restive 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 can store the source code of the various applications or the source code of the operating system or various materials generated by the application or operating system for long term storage purposes. The storage device 13 may include a flash memory, a phase change random access memory, a magnetic random access memory, a ferroelectric random access memory, or a 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 distributed or supplied to the various components of the multimedia device 10 based on the condition of the multimedia device 10 or the amount of work performed by the multimedia 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 material. For example, video codec 16 may encode the signals generated by camera 18 to produce video material. 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 (OLED), an active matrix organic light emitting diode (AMOLED), and a flexible display. Display or electronic ink.

The audio codec 19 can generate or store audio material. For example, the audio codec 19 can encode the signal generated by the microphone 21 to generate audio material. 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 play 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 the audio material by the connected personal playback unit.

The plug detector 100 can detect whether an 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 signals 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 a semiconductor package. For example, the plug detector 100 can be included in the audio codec 19.

The data machine 22 can communicate with an external device via the antenna 23. For example, data machine 22 can communicate with external devices based on at least one of a variety of wireless communication modes: Long Term Evolution (LTE), WiMax, Global System for Mobile (GSM) communication, for example. , 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 AT Attachment (SATA), High Speed InterChip (HSIC), Small Computer System Interface (Small Computer) System Interface (SCSI), Firewire, Peripheral Component Interconnection (PCI), PCI Express, PCIe, Non-Volatile Memory Express (NVMe), General Purpose Flash memory (Universal Flash Storage, UFS), All Digital (Secure Digital, SD), Secure Digital Input/Output (SDIO), Universal Asynchronous Receiver Transmitter (UART), Serial Peripheral Interface (SPI), High Speed Serial Interface (High Speed SPI) , HS-SPI), RS232, Inter-Integrated Circuit (I2C), High-Speed Internal Integrated Circuit (HS-I2C), Inter-Integrated-Interchip Sound (I2S), Sony/Philips Digital Interface ( Sony/Philips Digital Interface, S/PDIF), MultiMedia Card (MMC), Embedded Multimedia Card (embedded MMC, eMMC), etc.

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

Referring to FIG. 1 and FIG. 2 , the plug slot 200 can include a main body 210 , a first channel electrode 220 , a second channel electrode 230 , a ground electrode 240 , a first channel detecting electrode 225 , a ground detecting electrode 245 , and a microphone detecting electrode 255 . . The body 210 can 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 ground node of the plug detector 100. The ground node may be a node to which a ground voltage is supplied.

The first channel detecting electrode 225 and the ground detecting 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 detecting electrode 225 and the voltage of the ground detecting electrode 245.

The microphone detecting 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 a ground voltage to the microphone detecting 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 detecting 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 detecting electrode 255. When it is determined that the personal playback unit inserted into the plug slot 200 includes a microphone, the plug detector 100 can continuously apply a bias voltage to the microphone detecting electrode 255. The audio codec 19 can obtain audio data based on the voltage change of the microphone detecting electrode 255.

For example, the plug 300 inserted into the plug slot 200 can include four poles 310, 320, 330, and 340. The first pole 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 pole 320 can receive an audio signal from the second channel electrode 230, that is, an audio signal of the right channel. The third pole 330 can receive a ground voltage from the ground electrode 240. The fourth pole 340 can transmit the audio signal to the audio codec 19 by the microphone detecting 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 are electrically isolated from each other by the third insulator 335.

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

FIG. 3 illustrates an example in which the plug 400 of the external personal playback unit is inserted into the plug slot 200. For example, FIG. 3 illustrates 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 plug slot 200 will not be described again.

For example, the plug 400 inserted into the plug slot 200 can include three poles 410, 420, and 430. The first pole 410 can receive the audio signal of the first channel from the first channel electrode 220, for example, the audio signal of the left channel. The second pole 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 a ground voltage from the ground electrode 240. 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 as compared to the plug 300 shown in FIG. The plug 400 may not have a pole that is assigned to the 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 are 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 100a of plug detector 100, depicted in accordance with an illustrative embodiment. Referring to FIG. 2 to FIG. 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, and a first power. 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 a power supply node to which the power supply voltage VDD is supplied and a ground node to which the ground voltage is supplied. 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 constructed to compare the voltage of the first voltage V1 with the first channel detecting electrode 225. If the voltage of the first channel detecting 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 detecting 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 supply node and the first channel detecting electrode 225. The pull-up resistor PUR1 can transfer the power supply voltage VDD to the first channel detecting electrode 225, thereby causing the voltage of the first channel detecting electrode 225 to be 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 detecting electrode 245. The output of the logic gate circuit OR can be passed as an output signal OUT to the audio codec 19 via the output OT. For example, when the output of the logic gate circuit is at a low level (ie, when the voltage of the first channel detecting electrode 225 and the voltage of the ground detecting electrode 245 are a ground voltage or a low voltage close to a ground voltage), detectable 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 (ie, when at least one of the voltage of the first channel detecting electrode 225 and the voltage of the ground detecting electrode 245 is a power source voltage or a positive voltage similar to the power source 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 detecting electrode 255 and the ground node to which the ground voltage is supplied, 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 pin slot 200), the first transistor TR1 connects the ground electrode to the microphone detecting electrode 255. That is, the microphone detection node 255 can be supplied with a ground voltage. When the output of the logic gate circuit OR is at a low level (i.e., when the plug 300 or 400 is coupled to the pin slot 200), the first transistor TR1 can be turned off. 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 deactivated. When the output of the logic gate circuit OR is at a low level (i.e., when the plug 300 or 400 is coupled to the pin slot 200), the enable signal EN can be enabled.

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 deactivated, 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 a ground node to which the ground voltage is supplied. A node located between the third resistor R3 and the fourth resistor R4 is connectable to a positive input terminal of the second comparator CP2. The reference voltage VREF can be applied to the negative input of the second comparator CP2.

The second transistor TR2 may be connected between the third resistor R3 and a 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 transferred to the microphone detecting electrode 255 via the fifth resistor R5. The bias voltage generating circuit BG can adjust the bias voltage BIAS such 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 flow chart of a method of detecting whether a plug 300 or 400 is inserted into the plug slot 200, according to an exemplary embodiment.

Referring to FIGS. 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 detecting electrode 255. For example, in a case where the plug 300 is not inserted into the plug slot 200, the audio codec 19 can apply a 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 at a high level in the case where the plug 300 is not inserted into the plug slot 200, the ground detecting voltage VSS can be supplied to the microphone detecting electrode 255 by 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 detecting electrode 225 by the first pole 310. Therefore, the voltage of the first channel detecting electrode 225 can be reduced to the ground voltage VSS by the ground node of the first channel electrode 220. In addition, the ground detecting electrode 245 can be electrically connected to the ground electrode 240 through the third pole 330. Therefore, the voltage of the ground detecting 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 detecting electrode 225 and the voltage of the ground detecting electrode 245 can be reduced to the ground voltage VSS, and the output signal OUT can be reduced to a low level. .

Since the plug 300 is found not inserted into the plug slot 200 (unless the output signal OUT of the logic gate circuit OR is in the low position 凖), the detecting operation will be terminated. If the output signal OUT of the logic gate circuit OR is in the low position, the plug 300 can be detected to be inserted into the plug slot 200 in step S130. After that, the first transistor TR1 can electrically isolate the microphone detecting electrode 255 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 may be determined that the voltage of the microphone detecting electrode 255 is lower than the bias voltage BIAS or lower than the voltage at the bit 凖 which is similar to the bias voltage BIAS. For example, as shown in FIG. 3, in the case where the 3-pole plug 400 is inserted into the plug slot 200, the microphone detecting electrode 255 can be connected to the ground electrode by the third pole 430. Therefore, the voltage of the microphone detecting electrode 224 can be reduced to a voltage lower than the bias voltage BIAS (ie, can be reduced to the ground voltage VSS), and the personal playback unit can be detected without the microphone. As shown in FIG. 2, in the case where the 4-pole plug 300 is inserted into the plug slot 200, the fourth pole 340 can be connected to the microphone of the personal playback unit. For example, the microphone can have a resistance ranging from 1.35 kilo ohms (kΩ) to 33 kilo ohms. The voltage of the microphone detecting electrode 255 may be a bias voltage BIAS set by dividing the voltage of the node between the third resistor R3 and the second transistor TR2 by the resistance of the fifth resistor R5 and the microphone. 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 playback 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 a connection state when the 3-pole plug 400 is inserted into or separated from the plug slot 200. Referring to FIG. 6, the ground electrode 240 and the ground detecting electrode 245 are 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 detecting electrode 245 and the microphone detecting electrode 255 can be connected to the third pole 430. In this state, the current path CP may be formed by the third pole 430 between the ground detecting electrode 245 and the microphone detecting electrode 255, and the voltage of the third pole 430 may depend on the voltage of the ground detecting electrode 245 and the microphone. The voltage of the electrode 255 is detected.

FIG. 7 is a timing diagram showing voltage changes involved in the plug detector 100 in the connected state shown in FIG. 6. Referring to Figures 5, 6, and 7, the plug slot 200 and the 3-pole plug 400 can be connected to each other as shown in Figure 6. The first channel detecting electrode 225 can be connected to the power supply node by 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 detecting electrode 225 may be the power source voltage VDD. As shown in FIG. 6, if the first channel detecting electrode 225 is connected to the first channel electrode 220 by the first pole 410, the voltage of the first channel detecting electrode 225 can be as shown at the first time point T1. The ground voltage VSS is supplied to the first channel electrode 220 to be reduced to the ground voltage VSS.

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

When the plug 400 is not inserted into the plug slot 200, the voltage of the first channel detecting electrode 225 and the voltage of the ground detecting electrode 245 may be changed to the power source voltage VDD or a voltage approximately equal to the power source voltage VDD. Therefore, as shown before the first time point T1, the comparator CP can output an output signal having a high level 且 and the logic gate circuit OR can output an output signal OUT having 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 detecting electrode 225 and the voltage of the ground detecting electrode 245 can be reduced to a ground voltage VSS or a voltage approximately equal to the ground voltage VSS. Therefore, as shown at the first time point T1, the comparator CP can output a low level signal and the logic gate circuit OR can output an output signal OUT having a low level.

In the case where the plug 400 is not inserted into the plug slot 200, the output signal OUT can 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 detecting electrode 255, and the voltage of the microphone detecting electrode 255 can become the ground voltage VSS as shown before the first time point T1. If the output signal OUT transitions from the high level to the low level as shown at the first time point T1, the enable signal EN can be enabled. 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 detecting electrode 255 can be increased from the ground voltage VSS.

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

If the voltage of the ground detecting electrode 245 is increased, the output signal OUT of the logic gate circuit OR can be changed from the low level 高 to the high level 在 at the third time point T3. If the output signal OUT transitions to the high level 凖, 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 detecting 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 be reduced to the ground voltage VSS. The output signal OUT of the logic gate circuit OR can be switched from the high level 低 to the low level 第五 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 detecting electrode 255 can be increased from the ground voltage VSS to the bias voltage BIAS at the sixth time point T6.

As the voltage of the microphone detecting electrode 255 increases to the bias voltage BIAS, at the seventh time point T7, the voltage of the ground detecting electrode 245 can be increased.

As shown in FIG. 7, in the case where the ground detecting electrode 245 and the microphone detecting electrode 255 are short-circuited as shown in FIG. 6 and the ground electrode 240 is floating, the output signal OUT of the logic gate circuit OR can be in the high position and the low position. Change periodically. Although the output signal OUT periodically changes, the voltage of the third pole 430 may vary as the ground detecting electrode 245 or the microphone detecting electrode 255 changes.

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

Therefore, the exemplary embodiment can apply a ground voltage to the ground detecting 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. Referring to FIG. 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, and 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 elements in the plug detector 100 shown in FIG. 4 and the plug detector 100b shown in FIG. 8 will not be described below.

The third transistor TR3 can be connected between the ground detecting 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 by the second transistor TR2, the third transistor R3, and the fourth transistor R4) The third transistor TR3 can be turned on when a positive voltage is generated by dividing the power supply voltage VDD. Subsequently, the ground node can be connected to the ground detecting 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 through the third resistor R3 and the fourth resistor R4, the third transistor TR3 can be turned off. Subsequently, the ground node can be isolated from the ground detecting electrode 245.

FIG. 9 is a flow chart showing a method of performing plug insertion in the plug detector 100b shown in FIG. Referring to FIGS. 8 and 9, in step S210, a ground voltage may be supplied to the first channel electrode 220, the ground electrode 240, and the microphone detecting electrode 255. Step S210 can be performed in the same manner as step S120 in Fig. 5.

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

If the output signal OUT of the logic gate circuit OR is at the high level, the plug can be detected and the program can be terminated. If the output signal OUT of the logic gate circuit OR is in the low position, the plug insertion can be detected and step S230 can be performed.

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

If the voltage of the microphone detecting electrode 255 is lower than the bias voltage BIAS, the microphone can be detected and the program can be terminated. If the voltage of the microphone detecting electrode 255 is approximately 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 chart showing voltage changes involved in the plug detector 100b of FIG. 8 in the connected state shown in FIG. 6. Referring to FIG. 6 , FIG. 8 and FIG. 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 detecting electrode 225 can be self-powered. The voltage VDD is reduced to the ground voltage VSS. The voltage of the ground detecting 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 the high level to the low level. Subsequently, the insertion of the plug 400 can be detected.

At the second time point T2, the first transistor TR1 may be turned off and the bias voltage generating circuit BG may output the bias voltage BIAS. Therefore, the voltage of the microphone detecting 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 detecting electrode 245 can be connected to the ground node. Therefore, although the voltage of the microphone detecting electrode 255 is increased to the bias voltage BIAS, the voltage of the ground detecting electrode 245 can 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 detecting electrode 245 can be maintained at the ground voltage. Therefore, as described above in connection 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.

11 is a circuit diagram of an application 100c of the plug detector 100b shown in FIG. Referring to FIG. 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, a second pull-up resistor PUR2, and a first transistor TR1. The signal generator SG, the bias voltage generating circuit BG, and the third transistor TR3. The plug detector 100c may further include a pulse wave generating circuit PG as compared with the plug detector 100b shown in FIG. The third transistor TR3 can be controlled by the output pulse of the pulse wave generating circuit PG instead of the bias voltage BIAS.

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

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

The above exemplary embodiments are provided to fully explain the technical concept associated with the 3-pole plug 400 and the 4-pole plug 300. However, the exemplary embodiment is not limited to the 3-pole plug 400 and the 4-pole plug 300 described above, but can be widely applied to an n-pole plug (n is a positive integer).

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

While various exemplary embodiments have been described, it is apparent to those skilled in the art that various modifications and changes can be made without departing from the spirit and scope of the inventive concept. Therefore, it should be understood that the above illustrative embodiments are not limiting, but illustrative.

10‧‧‧Multimedia devices
11‧‧‧Application Processor
12‧‧‧ Random access memory
13‧‧‧Storage device
14‧‧‧Power Management Circuit
15‧‧‧Power supply
16‧‧‧Video codec
17‧‧‧Monitor
18‧‧‧ camera
19‧‧‧Audio codec
20‧‧‧Speakers
21‧‧‧ microphone
22‧‧‧Data machine
23‧‧‧Antenna
100, 100a, 100b, 100c‧‧‧ plug detector
200‧‧‧plug slot
210‧‧‧ Subject
220‧‧‧first channel electrode
225‧‧‧First channel detection electrode
230‧‧‧second channel electrode
240‧‧‧Ground electrode
245‧‧‧Grounding detection electrode
255‧‧‧Microphone detection electrode
300‧‧‧ plug
310‧‧‧ first pole
315‧‧‧First insulator
320‧‧‧second pole
325‧‧‧second insulator
330‧‧‧ third pole
335‧‧‧3rd insulator
340‧‧‧ 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‧‧‧Enable signal
OR‧‧‧ logic gate circuit
OT‧‧‧ output
OUT‧‧‧ output signal
PG‧‧‧ pulse wave generating circuit
PUR1‧‧‧First pull-up resistor
PUR2‧‧‧Second pull-up resistor
R1‧‧‧first resistance
R2‧‧‧second resistance
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‧‧‧ first time
T2‧‧‧ second time
T3‧‧‧ third time
T4‧‧‧ fourth time
T5‧‧‧ fifth time point
T6‧‧‧ Sixth time
T7‧‧‧ seventh time
TR1‧‧‧First transistor
TR2‧‧‧second transistor
TR3‧‧‧ third transistor
V1‧‧‧ first voltage
VDD‧‧‧Power supply voltage
VSS‧‧‧ Grounding voltage
VREF‧‧‧reference voltage

The above and other objects and features will become apparent from the following description taken in conjunction with the appended claims

FIG. 1 is a block diagram illustrating a multimedia device in accordance with an exemplary embodiment.

2 is an illustration of a plug in which an external personal playback unit is inserted into a plug slot, according to an exemplary embodiment.

3 is an illustration of a plug of an external personal playback unit inserted into a plug slot, in accordance with an illustrative embodiment.

4 is a circuit diagram of a plug detector illustrated in accordance with an illustrative embodiment.

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

6 is a connection of a plug slot or a 3-pole jack that is separate from the plug slot, in accordance with an exemplary embodiment.

FIG. 7 is a timing diagram of voltage variations involved in a plug detector, in accordance with an illustrative embodiment.

FIG. 8 is a circuit diagram of an application of a plug detector, in accordance with an illustrative embodiment.

FIG. 9 is a flow chart of a method of performing plug insertion, according to an exemplary embodiment.

FIG. 10 is a timing diagram of voltage variations involved in a plug detector, in accordance with an illustrative embodiment.

11 is a flow chart of an application of a plug detector in accordance with an exemplary embodiment.

10‧‧‧Multimedia devices

11‧‧‧Application Processor

12‧‧‧ Random access memory

13‧‧‧Storage device

14‧‧‧Power Management Circuit

15‧‧‧Power supply

16‧‧‧Video codec

17‧‧‧Monitor

18‧‧‧ camera

19‧‧‧Audio codec

20‧‧‧Speakers

21‧‧‧ microphone

22‧‧‧Data machine

23‧‧‧Antenna

100‧‧‧ Plug detector

200‧‧‧plug slot

OUT‧‧‧ output signal

Claims (20)

An audio device includes: an audio codec circuit connected to the first channel electrode, the second channel electrode, and the microphone detecting electrode; and a plug detecting circuit connected to the first channel detecting electrode, the ground detecting electrode, and the The microphone detecting electrode, wherein the plug detecting circuit detects the insertion of the plug and applies the ground according to the voltage of the first channel detecting electrode and the voltage of the ground detecting electrode corresponding to the ground voltage A voltage is applied to the ground detecting electrode, and a bias voltage is applied to the microphone detecting electrode. The audio device of claim 1, further comprising: a ground node to which the ground voltage is applied; and a transistor connected between the ground detecting electrode and the ground node, and configured to Operates at the bias voltage. The audio device of claim 2, wherein the plug detecting circuit comprises the transistor. The audio device of claim 1, further comprising: a ground node to which the ground voltage is applied; and a transistor connected between the ground detecting electrode and the ground node, and configured to The pulse signal works. The audio device of claim 4, further comprising a pulse wave generating circuit, wherein the pulse wave generating circuit is configured to respond to a voltage of the first channel detecting electrode and a voltage of the ground detecting electrode The pulse signal is enabled at the ground voltage, and the pulse signal is deactivated after a duty time. The audio device of claim 4, wherein the plug detecting circuit comprises the transistor. The audio device of claim 1, wherein the plug detecting circuit comprises: a comparator, configured to: if the first channel voltage of the first channel detecting electrode is equal to or higher than the first voltage, Outputting a high level 凖, and outputting a low level 若 if the first channel voltage is lower than the first voltage; and a first pull-up resistor connected to the first channel detecting electrode and a power supply node to which a power supply voltage is supplied between. The audio device of claim 7, wherein the plug detecting circuit further comprises: a logic gate circuit for performing or based on the output of the comparator and the voltage of the ground detecting electrode And a second pull-up resistor connected between the ground detecting electrode and the power node. The audio device of claim 8, wherein the plug detecting circuit detects the plug in response to the output of the logic gate circuit becoming a low level. The audio detecting device of claim 8, wherein the plug detecting circuit further comprises: a first transistor for arranging the microphone detecting electrode according to an output of the logic gate circuit being a high level Connected to the ground node and isolates the microphone detecting electrode from the ground node in response to the output of the logic gate circuit being low. The audio device of claim 8, wherein the plug detecting circuit further comprises: a bias voltage generating circuit configured to generate a bias voltage according to an output of the logic gate circuit being low and The bias voltage is delivered to the microphone detecting electrode. The audio device of claim 11, further comprising: a second transistor connected between the ground detecting electrode and the ground node for operating in response to the bias voltage. The audio device of claim 11, further comprising: a second transistor connected between the ground detecting electrode and the ground node, and configured to operate according to a pulse wave signal, wherein the pulse The wave signal is generated in response to the output of the logic gate circuit being the low level. A multimedia device, comprising: an application processor; a random access memory; a storage device; a video codec for processing video data by control of the application processor; and a display for editing by the video The decoder controls the display of the video signal; the plug slot is for inserting the external plug; the audio codec is connected to the first channel electrode, the second channel electrode and the microphone detecting electrode in the plug slot for Processing the audio data by the control of the application processor; and the plug detecting circuit is connected to the first channel detecting electrode, the ground detecting electrode and the microphone detecting electrode in the plug slot, wherein the first The voltage of the one-channel detecting electrode and the voltage of the ground detecting electrode correspond to a ground voltage, and the plug detecting circuit detects that the external plug is inserted into the plug slot, and the ground voltage is applied to the ground The electrode is detected and a bias voltage is applied to the microphone detecting electrode. The multimedia device of claim 14, wherein the audio codec and the plug detecting circuit are implemented in a semiconductor package. The multimedia device of claim 14, wherein the multimedia device comprises at least one of a smart phone, a smart tablet, a smart TV, a smart watch, and a wearable device. An audio device includes: a logic gate circuit for outputting a first signal according to a voltage of a first channel detecting electrode and a voltage of a ground detecting electrode in a plug slot, and corresponding to the plug At least one of the voltage of the first channel detecting electrode and the voltage of the ground detecting electrode in the slot is not the ground voltage and outputs a second bit signal; the transistor is configured to respond The logic gate circuit outputs the first bit signal to connect the ground detecting electrode to a ground node to which the ground voltage is supplied; and a bias voltage generator for responding to the logic gate circuit Outputting the first bit signal to generate a bias voltage and applying the bias voltage to the microphone detecting electrode, and applying the ground voltage according to the logic gate circuit outputting the second bit signal To the microphone detecting electrode. The audio device of claim 17, wherein the transistor is operative to operate in response to the bias voltage. The audio device of claim 17, further comprising a pulse wave generating circuit, wherein the pulse wave generating circuit is configured to generate a pulse wave signal according to an output of the logic gate circuit outputting the first bit signal . The audio device of claim 17, wherein the plug slot comprises a first channel electrode, a second channel electrode and a ground electrode, and the audio device further comprises an audio codec circuit, the audio codec The device circuit is configured to output an audio signal via the first channel electrode, the second channel electrode, and the ground electrode, and receive an audio signal via the microphone detecting electrode.