KR20170005360A - Audio device and multimedia device including audio device - Google Patents

Abstract

The present invention relates to an audio device. The audio device according to the present invention includes an audio codec circuit which is connected to a microphone detection electrode, a second channel electrode, and a first channel electrode of a jack slot; and a jack detection circuit which is connected to the microphone detection electrode, a ground detection electrode, and the first channel detection electrode of the jack slot. The jack detection circuit detects that a jack is inserted into the jack slot if the voltages of the ground detection electrode and the first channel detection electrode are ground voltages, applies the ground voltage to the ground detection electrode in response to the detection, and applies a bias voltage to the microphone detection electrode. Accordingly, the present invention can provide a user with improved convenience.

Description

TECHNICAL FIELD [0001] The present invention relates to a multimedia device including an audio device and an audio device,

The present invention relates to an electronic device, and more particularly to a multimedia device including an audio device and an audio device.

A multimedia device such as a smart phone, smart pad, etc. is configured to generate and reproduce video data and audio data. The audio data may be played back publicly through a speaker or played back to an individual via a personal playback device such as an earphone, headphone, or the like. The multimedia device is configured to reproduce the audio data through the speaker when the personal reproduction device is not connected, and to reproduce the audio data through the personal reproduction device when the personal reproduction device is connected. In order to realize such a function, the multimedia device includes a jack detection circuit for detecting whether a jack of the personal playback apparatus is inserted into the jack slot of the multimedia apparatus.

When the jack is coupled to or disconnected from the jack slot, various noise may occur. The generated noise is reproduced through the personal reproduction apparatus, which may hinder the user's convenience. Thus, there is a need for an apparatus or method for preventing noise from occurring when the jack is coupled to or removed from the jack slot to improve user comfort.

It is an object of the present invention to provide a multimedia device including an audio device and an audio device that provide enhanced user convenience.

An audio apparatus according to embodiments of the present invention includes an audio codec circuit connected to a first channel electrode, a second channel electrode, and a microphone detection electrode of a jack slot, and a first channel detection electrode, a ground detection electrode, And a jack detection circuit connected to the electrode. The jack detection circuit detects that the jack is inserted into the jack slot when the voltages of the first channel detection electrode and the ground detection electrode are at the ground voltage, applies a ground voltage to the ground detection electrode in response to the detection, Thereby applying a bias voltage.

A multimedia device according to embodiments of the present invention includes an application processor configured to perform computation and control operations, a random access memory used as a main memory of an application processor, a storage device used as an auxiliary storage device of an application processor, A display configured to display a video signal under control of the video codec, a jack slot configured to receive an external jack, a first channel electrode of the jack slot, a second channel An audio codec connected to the electrode and microphone detection electrodes and configured to process the audio data under the control of the application processor, and a jack detection circuit coupled to the first channel detection electrode, the ground detection electrode and the microphone detection electrode of the jack slot The. The jack detection circuit detects that the jack is inserted in the jack slot when the voltages of the first channel detection electrode and the ground detection electrode are at the ground voltage, applies a ground voltage to the ground detection electrode in response to detection, As shown in FIG.

The multimedia device according to embodiments of the present invention outputs a first level signal when the voltages of the first channel detection electrode and the ground detection electrode of the jack slot are at the ground voltage and at least one of the first channel detection electrode and the ground detection electrode A logic gate circuit configured to output a second level signal when the level of the first level signal is not equal to the ground voltage, a logic gate circuit configured to connect the ground detection electrode with a ground node supplied with a ground voltage when the logic gate circuit outputs a first level signal, And to deliver a bias voltage to the microphone detection electrode of the jack slot when the logic gate circuit outputs the first level signal and to deliver a ground voltage to the microphone detection electrode when the logic gate circuit outputs the second level signal Bias voltage generator.

According to the embodiments of the present invention, noise is prevented from occurring even when the ground detecting electrode and the microphone detecting electrode are shorted when the jack is coupled with the jack slot and / or the jack slot. Accordingly, there is provided a multimedia apparatus including an audio apparatus and an audio apparatus that provide enhanced user convenience.

1 is a block diagram illustrating a multimedia device according to an embodiment of the present invention.
Figs. 2 and 3 show examples in which a jack of an external personal playback apparatus is inserted into a jack slot. Fig.
4 is a circuit diagram showing a jack detector according to embodiments of the present invention.
5 is a flow chart illustrating a method of detecting whether a jack is inserted into a jack slot.
6 shows the connection relationship that occurs when a jack having a 3-pole is inserted into or removed from a jack slot.
7 is a timing diagram showing changes in voltages associated with the jack detector in the connection relationship of FIG.
Fig. 8 is a circuit diagram showing an application example of the jack detector of Fig. 4). Fig.
Figure 9 is a flow chart showing how jack insertion is performed in the jack detector of Figure 8;
10 is a timing diagram showing changes in voltages associated with the jack detector of FIG. 8 in the connection relationship of FIG. 6;
Fig. 11 is a circuit diagram showing an application example of the jack detector of Fig. 8; Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the technical idea of the present invention. .

1 is a block diagram illustrating a multimedia device 10 in accordance with an embodiment of the present invention. For example, the multimedia device 10 may form at least one of a smart phone, a smart pad, a smart television, a smart clock, and a wearable device. 1, a multimedia device 10 includes an application processor 11, a random access memory 12, a storage device 13, a power management circuit 14, a power source 15, a video codec 16, An audio codec 19, a speaker 20, a microphone 21, a modem 22, an antenna 23, a jack detector 100, and a jack slot 200 .

The application processor 11 may perform a control operation for controlling the multimedia device 10 and a calculation operation for calculating various data. The application processor 11 may execute an operating system and various applications.

The random access memory 12 can be used as the main memory of the application processor 11. [ For example, the random access memory 12 may store various data and process codes that are processed by the application processor 11. The random access memory 12 may include a dynamic random access memory (DRAM), a static random access memory (SRAM), a phase change RAM (PRAM), a magnetic RAM (MRAM), a ferroelectric random access memory (FeRAM) .

The storage device 13 can be used as an auxiliary storage device of the application processor 11. [ For example, various data generated for the purpose of long-term storage by an operating system executed by the application processor 11 or source codes, operating systems or applications of various applications may be stored in the storage device 13 . The storage device 13 may include a flash memory, a phase-change RAM (PRAM), a magnetic RAM (MRAM), a ferroelectric RAM (FeRAM), a resistive RAM (RRAM)

The power management circuit 14 may distribute or supply the power supplied from the power source 15 to the components of the multimedia device 10. [ The power management circuit 14 may adjust the amount of power distributed or supplied to the components of the multimedia device 10 depending on the state of the multimedia device 10 or the amount of work performed by the multimedia device 10. [ have. For example, the power management circuit 14 may control the power saving mode of each of the components of the multimedia device 10 or the multimedia device 10.

The power source 15 may include a power source or a portable battery installed in an artificial structure such as a building.

The video codec 16 can generate or reproduce video data. For example, the video codec 16 may encode data obtained by the camera 18 to generate video data. The video codec 16 may 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 reproduce it via the display 17. [ For example, the display 17 may include an LCD (Liquid Crystal Display), an OLED (Organic Light Emitting Diode), an AMOLED (Active Matrix OLED), a flexible display, an electronic ink and the like.

The audio codec 19 may generate or store audio data. For example, the audio codec 19 can generate audio data by coding data obtained by the microphone 21. [ 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 reproduce it through the speaker 20.

The audio codec 19 is connected to the jack detector 100 and the jack slot 200. The jack detector 100 can detect whether an external personal playback apparatus is inserted into the jack slot 200 and provide the detection result to the audio codec 19 as an output signal OUT. When an external personal playback apparatus is inserted into the jack slot 200, the audio codec 19 can reproduce audio data through the personal playback apparatus.

The jack detector 100 may detect whether an external personal playback device inserted in the jack slot 200 includes a microphone. If the external personal playback apparatus includes a microphone, the audio codec 19 may generate audio data based on data obtained from a microphone of an external personal playback apparatus.

Illustratively, audio codec 19 and jack detector 100 may be implemented in a single semiconductor package. For example, the jack detector 100 may be included within the audio codec 19.

The modem 22 can communicate with the external device via the antenna 23. [ For example, the modem 22 may be a wireless communication system such as Long Term Evolution (LTE), WiMax, Global System for Mobile communication (GSM), Code Division Multiple Access (CDMA), Bluetooth, Near Field Communication (USB), a Serial AT Attachment (SATA), a High Speed Interchip (HSIC), a Small Computer System Interface (SCSI), a Fire (WiFi), and a Radio Frequency IDentification (USB), Firewire, Peripheral Component Interconnection (PCI), PCI Express (PCI Express), Nonvolatile Memory Express (NVMe), Universal Flash Storage (UFS), Secure Digital (SD), SDIO, Universal Asynchronous Receiver Transmitter Serial Peripheral Interface), HS-SPI (High Speed SPI), RS232, I2C (Integrated Circuit), HS-I2C, Integrated- interchip Sound, S / PDIF (Sony / Philips Digital Interface) MultiMedia Card), eMMC (embedded MMC), and the like. And it can perform communication.

2 shows an example in which a jack 300 of an external personal playback apparatus is inserted into a jack slot 200. [ For example, an example in which a jack 300 having a 4-pole is inserted is shown in Fig.

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

The first channel electrode 220 and the second channel electrode 230 are connected to the audio codec 19. The audio codec 19 may apply the power voltage to the first channel electrode 220 and the second channel electrode 230 when the jack 300 is not coupled to the jack slot 200. When the jack 300 is coupled to the jack slot 200, the audio codec 19 can deliver audio signals to the first channel electrode 220 and the second channel electrode 230, respectively.

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

The first channel detection electrode 225 and the ground detection electrode 245 may be connected to the jack detector 100. The jack detector 100 may detect whether the jack 300 is coupled to the jack slot 200 based on the voltages of the first channel sensing electrode 225 and the ground sensing electrode 245.

The microphone detection electrode 255 is connected to the jack detector 100 and the audio codec 19. When the jack 300 is not coupled to the jack slot 200, the jack detector 100 can deliver a ground voltage to the microphone detection electrode 255. [ When it is detected that the jack 300 is inserted into the jack slot 200, the jack detector 100 applies a bias voltage to the microphone detection electrode 255 so that the personal playback device inserted in the jack slot 200 It is possible to detect whether or not it includes. If the personal playback device inserted into the jack slot 200 does not include a microphone, the jack detector 100 may apply a ground voltage to the microphone detection electrode 255. [ If the personal playback device inserted into the jack slot 200 includes a microphone, the jack detector 100 can continuously apply a bias voltage to the microphone detection electrode 255. [ The audio codec 19 can acquire audio data based on the voltage change of the microphone detection electrode 255. [

Illustratively, the jack 300 inserted in the jack slot 200 may comprise a 4-pole. The first electrode 310 may receive the audio signal of the first channel, for example, the audio signal of the left channel, from the first channel electrode 220. The second electrode 320 may 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 330 may receive a ground voltage from the ground electrode 240. The fourth pole 340 may transmit the audio signal to the codec 19 through the microphone detection electrode 255.

The first and second poles 310 and 320 may be electrically separated by the first insulator 315. The second pole 320 and the third pole 330 may be electrically separated by the second insulator 325. The third pole 330 and the fourth pole 340 may be electrically separated by the third insulator 335.

Illustratively, the ground detection electrode 245 and the ground electrode 240 of the jack slot 200 may be misaligned. For example, due to a process error or as defined in the specification, the ground detection electrode 245 and the ground electrode 240 may be disposed between the first insulator 315, the second insulator 325, And may not be located on an axis parallel to the axis 335.

3 shows an example in which a jack 400 of an external personal playback apparatus is inserted into the jack slot 200. In FIG. Illustratively, an example in which a jack 400 with a three-pole is inserted is shown in FIG. 2 and 3, the jack slot 200 has the same structure. Therefore, a detailed description of the jack slot 200 is omitted.

Illustratively, the jack 400 inserted in the jack slot 200 may comprise a three-pole. The first electrode 410 may receive an audio signal of the first channel, for example, an audio signal of the left channel, from the first channel electrode 220. The second electrode 420 may receive the audio signal of the second channel from the second channel electrode 430, for example, the audio signal of the right channel. The third pole 430 may receive a ground voltage from the ground electrode 240. 3, the third pole 430 of the jack 400 is extended to the position of the fourth pole 340 of the jack 300. As shown in FIG. The jack 400 does not have a pole assigned to the microphone and the personal playback device connected to the jack 400 may not have a microphone.

The first and second poles 410 and 420 may be electrically separated by the first insulator 415. The second pole 420 and the third pole 430 may be electrically separated by the second insulator 425.

4 is a circuit diagram showing a jack detector 100 according to embodiments of the present invention. 2 to 4, the jack detector 100 includes 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, a signal generator SG, and a bias voltage generating circuit BG.

The first resistor R1 and the second resistor R2 are connected in series between the power supply node to which the power supply voltage VDD is supplied and the ground node to which the ground voltage is supplied. The voltage at 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 voltage of the first voltage V1 with the voltage of the first channel detection electrode 225. [ When 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. When the voltage of the first channel detection electrode 225 is lower than the first voltage V1, the comparator CP can output a low level. The output of the comparator CP is transferred to the logic gate circuit OR.

The first pull-up resistor PUR1 is connected between the power supply node and the first channel detecting electrode 225. [ The first pull-up resistor PUR1 is connected to the power supply voltage VDD so that the voltage of the first channel detection electrode 225 becomes the power supply voltage VDD when the jack 300 or 400 is not coupled to the jack slot 200 To the first channel detection electrode 225.

The logic gate circuit (OR) may perform an AND operation based on the output of the comparator (CP) and the voltage of the ground detecting electrode (245). The output of the logic gate circuit OR may be transmitted as an output signal OUT to the audio codec 19 via the output terminal OT. Illustratively, when the output of the logic gate circuit OR is at a low level, that is, when the voltages of the first channel sensing electrode 225 and the ground sensing electrode 245 are low voltages having a ground voltage or a similar level, (300 or 400) may be detected as being coupled to the jack slot (200). When the output of the logic gate circuit OR is at a high level, that is, when at least one of the voltages of the first channel detecting electrode 225 and the ground detecting electrode 245 has a power supply voltage VDD or a similar level When voltage is applied, it can be detected that the jack 300 or 400 is not coupled to the slot 200.

The first transistor TR1 is connected between the microphone detection electrode 255 and the ground node to which the ground voltage is supplied and operates under the control of the logic gate circuit OR. When the output of the logic gate circuit OR is at a high level, that is, when the jack 300 or 400 is not coupled to the jack slot 200, the first transistor TR1 connects the ground node to the microphone detection electrode 255 Connect. That is, the ground voltage is supplied to the microphone detection electrode 255. [ The first transistor TR1 is turned off when the output of the logic gate circuit OR is at a low level, that is, when the jack 300 or 400 is coupled to the jack slot 200. [ That is, the voltage of the microphone detecting electrode 255 is controlled by the bias voltage generating circuit BG.

The signal generator SG outputs the activation signal EN. For example, when the output of the logic gate circuit OR is at a high level, that is, when the jack 300 or 400 is not coupled to the jack slot 200, the activation signal EN is inactivated. When the output of the logic gate circuit OR is at a low level, that is, when the jack 300 or 400 is coupled to the jack slot 200, the activation signal EN is activated.

When the activation signal EN is activated, the bias voltage generation circuit BG supplies the bias voltage BIAS to the microphone detection electrode 255. [ When the activation signal EN is deactivated, the bias voltage generating circuit BG is inactivated and does not output the bias voltage BIAS. For example, the bias voltage generating circuit BG can output the ground voltage.

The bias voltage generating circuit BG includes a second comparator CP2, a 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 ground node to which the ground voltage is supplied and the second transistor TR2. The node between the third resistor R3 and the fourth resistor R4 is connected to the positive input of the second comparator CP2. The reference voltage VREF is input to the negative input of the second comparator CP2.

The second transistor TR2 is connected between the power supply node to which the power supply voltage VDD is supplied and the third resistor R3. The second transistor TR2 is controlled according to the output of the second comparator CP2. The voltage of the node between the second transistor TR2 and the third resistor R3 is the bias voltage BIAS. The bias voltage BIAS is transmitted to the microphone detection electrode 255 through 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 becomes equal to the reference voltage VREF.

5 is a flow chart illustrating a method of detecting whether a jack 300 or 400 is inserted into a jack slot 200. [ Illustratively, a method for detecting whether a jack 300 is inserted into a jack slot 200, with the jack 300 or 400 not being coupled to the jack slot 200, is shown in FIG.

2 to 5, the ground voltage VSS is applied to the first channel electrode 220, the ground electrode 240, and the microphone detection electrode 255 in step S110. For example, in a state where the jack 300 is not detected to be inserted into the jack slot 200, the audio codec 19 may include a first channel electrode 220 and a second channel electrode 230, 240 to the ground voltage VSS. The output of the logic gate circuit OR of the jack detector 100 is at the high level and the microphone detection electrode 255 is connected to the first transistor TR1 via the first transistor TR1, The ground voltage VSS is supplied.

The first channel electrode 220 and the first channel sensing electrode 225 are electrically connected through the first pole 310 when the jack 300 is coupled to the jack slot 200 in step S120. Therefore, the voltage of the first channel sensing electrode 225 is reduced to the ground voltage VSS by the ground node connected to the first channel electrode 220. Also, the ground detection electrode 245 and the ground electrode 240 are electrically connected through the third pole 330. Therefore, the voltage of the ground detecting electrode 245 is reduced to the ground voltage VSS by the ground node connected to the ground electrode 240. [ That is, when the jack 300 is coupled to the jack slot 200, the voltages of the first channel detection electrode 225 and the ground detection electrode 245 are reduced to the ground voltage VSS, The output signal OUT decreases to a low level.

If the output signal OUT of the logic gate circuit OR is not at the low level, the jack 300 is not inserted in the jack slot 200, so that the detection operation is ended. When the output signal OUT of the logic gate circuit OR becomes a low level, the jack 300 is detected as being inserted into the jack slot 200. Thereafter, the first transistor TR1 electrically isolates the microphone detection electrode 255 from the ground node, and the bias voltage generation circuit BG transmits the bias voltage BIAS to the microphone detection electrode 255.

In step S140, it is determined whether the voltage of the microphone detecting electrode 255 is lower than the voltage having the bias voltage BIAS or a similar level. 3, when the jack 400 having a three-pole is inserted into the jack slot 200, the microphone detecting electrode 255 is connected to the ground electrode through the third pole 430 . Therefore, the voltage of the microphone detection electrode 255 is reduced to a voltage lower than the bias voltage BIAS, for example, the ground voltage VSS, and it is determined that the personal reproduction apparatus does not have a microphone. 2, when the jack 300 having a four-pole is inserted into the jack slot 200, the fourth pole 340 is connected to the microphone of the personal playback apparatus. For example, the microphone may have a resistance value in the range of 1.35 kohm to 33 kohm. The voltage of the microphone detection electrode 255 becomes the bias voltage BIAS whose voltage at the node between the third resistor R3 and the second transistor TR2 is a value divided by the fifth resistor R5 and the resistance of the microphone . Therefore, in step S150, it is detected that the personal playback apparatus has a microphone.

Illustratively, when it is detected that the personal playback apparatus has a microphone, the bias voltage generation circuit BG can continuously transmit the bias voltage BIAS to the microphone detection electrode 255. [ The microphone of the personal reproduction apparatus can acquire an audio signal using a bias voltage. The obtained audio signal may be represented by a change in the voltage of the microphone detection electrode 255.

6 shows the connection relationship that occurs when a jack 400 having three poles is inserted into or removed from the jack slot 200. [ Referring to FIG. 6, the ground electrode 240 and the ground detecting electrode 245 are not aligned. Thus, the ground electrode 240 may not be electrically connected to the jack 400 at a location aligned with the second insulator 425. The ground detection electrode 245 and the microphone detection electrode 255 may be connected to the third pole 430. At this time, a current path CP is formed between the ground detection electrode 245 and the microphone detection electrode 255 by the third pole 430, and the voltage of the third pole 430 is connected to the ground detection electrode 245 and / Is determined by the voltages of the microphone detection electrode 255. [

FIG. 7 is a timing diagram showing changes in voltages associated with the jack detector 100 in the connection relationship of FIG. Referring to Figs. 5, 6 and 7, at the first timing T1, a jack 400 having a jack slot 200 and a three-pole can be connected as shown in Fig. The first channel detection electrode 225 is connected to the power supply node through the first pull-up resistor PUR1. Therefore, when the jack 400 is not inserted, the voltage of the first channel detecting electrode 225 may be the power supply voltage VDD. 6, when the first channel sensing electrode 225 is connected to the first channel electrode 220 through the first electrode 410, the voltage of the first channel sensing electrode 225 is connected to the first channel sensing electrode 225, And decreases to the ground voltage VSS due to the ground voltage VSS supplied to the electrode 220.

The ground detection electrode 245 is connected to the power supply node through the second pull-up resistor PUR2. Therefore, when the jack 400 is not inserted, the voltage of the ground detecting electrode 245 may be the power supply voltage VDD. 6, when 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 is transmitted through the first transistor TR1 And decreases to the ground voltage VSS due to the ground voltage VSS at the microphone detection electrode 255. [

When the jack 400 is not inserted, the voltage of the first channel detecting electrode 225 and the voltage of the ground detecting electrode 245 are the voltages having the power supply voltage VDD or the like. Therefore, the comparator CP outputs the high level to the output signal OUT, and the logic gate circuit OR outputs the high level. 6, when the jack is inserted, the voltage of the first channel detecting electrode 225 and the voltage of the ground detecting electrode 245 are reduced to voltages having a ground voltage VSS or a similar level. Therefore, the comparator CP outputs a low level, and the logic gate circuit OR outputs a low level to the output signal OUT. That is, the insertion of the jack 400 is detected.

In a state where the jack 400 is not inserted, the output signal OUT is at a high level. Accordingly, the first transistor TR1 connects the ground node to the microphone detection electrode 255, and the voltage of the microphone detection electrode OR is the ground voltage VSS. When the output signal OUT transits from the high level to the low level, the activation signal EN is activated. Therefore, at the second timing T2, the first transistor TR1 is turned off, and the bias voltage generating circuit BG outputs the bias voltage BIAS. Therefore, the voltage of the microphone detecting electrode 255 rises from the ground voltage VSS to the bias voltage BIAS.

When the voltage of the microphone detection electrode 255 rises from the ground voltage VSS to the bias voltage BIAS, the ground detection connected to the microphone detection electrode 255 and the third pole 430 at the third timing T3 The voltage of the electrode 245 rises. For example, the voltage of the ground detection electrode 245 is controlled by the bias voltage BIAS supplied from the microphone detection electrode 255, the power supply voltage VDD supplied through the second pull-up resistor PUR2, or the bias voltage BIAS ) And the power supply voltage VDD.

When the voltage of the ground detection electrode 245 rises, the output signal OUT of the logic gate circuit OR transits from a low level to a high level. When the output signal OUT transitions to the high level, the first transistor TR1 is turned on and the bias voltage generating circuit BG is inactivated. Therefore, at the fourth timing T4, the voltage of the microphone detecting electrode 255 decreases to the ground voltage VSS.

As the voltage of the microphone detecting electrode 255 decreases to the ground voltage VSS, the voltage of the ground detecting electrode 245 also decreases to the ground voltage VSS at the fifth timing T5. The output signal OUT of the logic gate circuit OR transits from the low level to the high level. At the sixth timing, the first transistor TR1 is turned off, and the bias voltage generating circuit BG outputs the bias voltage BIAS. Therefore, the voltage of the microphone detecting electrode 255 rises from the ground voltage VSS to the bias voltage BIAS.

As the voltage of the microphone detecting electrode 255 rises to the bias voltage BIAS, the voltage of the ground detecting electrode 245 rises at the seventh timing T7.

7, in the connection relationship in which the ground electrode 240 floats and the ground detection electrode 245 and the microphone detection electrode 255 are short-circuited as shown in FIG. 6, the output signal ( OUT can periodically transition between a high level and a low level. While the output signal OUT periodically transitions, the voltage of the third pole 430 may change together with the change in the ground detection electrode 245 or the microphone detection electrode 255. [

The personal playback apparatus reproduces the audio signal of the first channel based on the difference between the voltage of the first pole 410 and the voltage of the third pole 430 and reproduces the audio signal of the third pole 430, To reproduce the audio signal of the second channel based on the voltage difference of the second channel. As shown in FIG. 7, when the voltage of the third pole 430 periodically changes, noise can be periodically reproduced through the personal playback apparatus.

In order to solve such a problem, embodiments of the present invention can apply the ground voltage to the ground detection electrode 245 after the insertion of the jack 400 is detected.

Illustratively, the technical spirit of the present invention is not limited to the timing diagram of FIG. FIG. 7 is an exemplary illustration for effectively explaining the technical idea of the present invention, and the timing diagram of FIG. 7 may be variously modified and applied. For example, the voltage variations shown as occurring at the same timing in Fig. 7 can be changed and applied to occur at different timings. In addition, the voltage changes shown as occurring at different timings in Fig. 7 can be changed and applied to occur at the same timing.

8 is a circuit diagram showing an application example 100a of the jack detector 100 of FIG. 8, the jack detector 100a includes 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- A first transistor TR1, a signal generator SG, a bias voltage generating circuit BG, and a third transistor TR3. Compared to the jack detector 100 of FIG. 4, the jack detector 100a further includes a third transistor TR3. A detailed description of the components commonly shown in the jack detector 100 of FIG. 4 and the jack detector 100a of FIG. 8 is omitted.

The third transistor TR3 is connected between the ground detecting electrode 245 and the ground node to which the ground voltage is supplied, and is controlled by the bias voltage BIAS. When the bias voltage generating circuit BG is activated and outputs the bias voltage BIAS, the third transistor TR3 is turned on. That is, a ground node is connected to the ground detection electrode 245. When the bias voltage generating circuit BG is inactivated and outputs a ground voltage, the third transistor TR3 is turned off. That is, the ground detecting electrode 245 is separated from the ground node.

9 is a flow chart showing how jack insertion is performed in the jack detector 100a of FIG. 8 and 9, a ground voltage is supplied to the first channel electrode 220, the ground electrode 240, and the microphone detection electrode 255 in step S210. Step S210 is performed in the same manner as step S110 of FIG.

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

If the output signal OUT of the logic gate circuit OR is at a high level, no jack insertion is detected and the process is terminated. If the output signal OUT of the logic gate signal OR is low, step S230 is performed.

In step S230, jack insertion is detected. A ground voltage VSS is applied to the ground detection electrode and a bias voltage BIAS is applied to the microphone detection electrode 255 and a ground voltage VSS is applied to the ground detection electrode 245 do. For example, the bias voltage generating circuit BG is activated and can apply the bias voltage BIAS to the microphone detecting electrode 255. [ The third transistor TR3 may be turned on by the bias voltage BIAS and may transmit the ground voltage VSS to the ground detecting electrode 245. [

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

If the voltage of the microphone detection electrode 255 is lower than the bias voltage BIAS, the microphone is not detected and the process is terminated. If the voltage of the microphone detection electrode 255 is similar to the bias voltage BIAS, the microphone is detected in step S250. The step S250 may be performed in the same manner as the step S150 of FIG.

FIG. 10 is a timing diagram showing changes in voltages associated with the jack detector 100a of FIG. 8 in the connection relationship of FIG. 6, 8 and 10, when the jack 400 having the jack slot 200 and the 3-pole at the first timing T1 is connected as shown in FIG. 6, The voltage of the electrode 225 decreases from the power supply voltage VDD to the ground voltage VSS. The voltage of the ground detection electrode 245 decreases from the power supply voltage VDD to the ground voltage VSS. Therefore, the output signal OUT of the logic gate circuit OR transits from the high level to the low level. That is, the insertion of the jack 400 is detected.

At the second timing T2, the first transistor TR1 is turned off, and the bias voltage generating circuit BG outputs the bias voltage BIAS. Therefore, the voltage of the microphone detecting electrode 255 rises from the ground voltage VSS to the bias voltage BIAS. Further, the third transistor TR3 is turned on by the bias voltage BIAS, and the ground detecting electrode 245 is connected to the ground node. Therefore, even if the voltage of the microphone detecting electrode 255 rises to the bias voltage BIAS, the voltage of the ground detecting electrode 245 is maintained at the ground voltage VSS.

Thereafter, the voltage of the ground detecting electrode 245 is maintained at the ground voltage even when the third to sixth timings T3 to T7 have elapsed. Thus, as described with reference to FIG. 7, the voltage of the third pole 430 of the jack 400 is prevented from changing, and noise is prevented. That is, user convenience is improved.

Illustratively, the technical spirit of the present invention is not limited to the timing diagram of FIG. FIG. 10 is an exemplary illustration for effectively explaining the technical idea of the present invention, and the timing diagram of FIG. 10 can be variously changed and applied. For example, the voltage changes shown as occurring at the same timing in Fig. 10 can be changed and applied to occur at different timings. In addition, the voltage changes shown as occurring at different timings in Fig. 10 can be changed and applied to occur at the same timing.

11 is a circuit diagram showing an application example 100b of the jack detector 100a of FIG. 11, the jack detector 100b includes 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- A first transistor TR1, a signal generator SG, a bias voltage generating circuit BG, and a third transistor TR3. Compared to the jack detector 100a of FIG. 8, the jack detector 100b further includes a pulse generation circuit (PG). The third transistor TR3 is controlled by the output pulse of the pulse generation circuit PG instead of the bias voltage BIAS.

Referring to Fig. 11, the pulse generation circuit PG is configured to output a pulse signal in response to the activation signal EN. For example, the pulse generating circuit PG is a pulse generating circuit that transitions from a low level to a high level when the activation signal EN is activated, and a pulse signal that transitions from a high level to a low level after a duty time has elapsed Can be output. For example, the duty time may be set to be equal to or longer than the time the jack detector 100b detects whether the personal playback device includes a microphone. For example, the duty time may be the time at which the detection of the microphone is performed.

When the output pulse of the pulse generating circuit PG transitions from the low level to the high level, the third transistor TR3 is turned on. Therefore, the ground node is connected to the ground detection electrode 245, and the voltage of the ground detection electrode 245 in the connection relationship shown in FIG. 6 is prevented from changing according to the voltage of the microphone detection electrode 255. When the output pulse of the pulse generation circuit PG transits from the high level to the low level after the detection of the microphone is completed, the third transistor TR3 is turned off. That is, the ground detecting electrode 245 is disconnected from the ground node, and a pull-up resistor PUR1 connected to the ground detecting electrode 245 is applied. For example, when the jack 400 is disconnected from the jack slot 200, the voltage of the ground detection electrode 245 rises to the power supply voltage VDD by the pull-up resistor PUR1 and the power supply node. That is, when the pull-up resistor PUR1 is applied, the ground detecting electrode 245 can detect that the jack 400 is disconnected from the jack slot 200. [

In the above-described embodiments, the technical idea of the present invention has been described with reference to a jack 300 having three poles and a jack 300 having four poles. However, the technical idea of the present invention is not limited to a jack having a three-pole and a jack having a four-pole, and can be applied to a jack having an n-pole (n is a positive integer).

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by the equivalents of the claims of the present invention as well as the claims of the following.

10; A multimedia device 11; Application processor
12; A random access memory 13; Storage device
14; Power management circuit 15; power
16; Video codec 17; display
18; Camera 19; Audio codec
20; A speaker 21; microphone
100, 100a, 100b; Detector R1; The first resistance
R2 is; A second resistor CP; Comparator
PUR1; A first pull-up resistor OR; Logic gate circuit
PUR2; A second pull-up resistor TR1; The first transistor
SG; Signal generator BG; Bias voltage generating circuit
CP2; A second comparator TR2; The transistor
R3 is; A third resistor R4; Fourth resistance
R5; A fifth resistor TR3; The third transistor
200; Jack slot 210; main body
220; A first channel electrode 230; The second channel electrode
240; A ground electrode 225; The first channel detection electrode
245; Ground detection electrode 255; Microphone detection electrode
300; Jack 310; First pole
320; A second pole 330; Third pole
340; A fourth pole 315; The first insulator
325; A second insulator 335; The third insulator

Claims (20)

An audio codec circuit coupled to the first channel electrode, the second channel electrode, and the microphone detection electrode of the jack slot; And
And a jack detection circuit connected to the first channel detection electrode, the ground detection electrode, and the microphone detection electrode of the jack slot,
Wherein the jack detection circuit detects that a jack is inserted in the jack slot when voltages of the first channel detection electrode and the ground detection electrode are a ground voltage and applies a ground voltage to the ground detection electrode in response to the detection And apply a bias voltage to the microphone detection electrode. The method according to claim 1,
And a transistor coupled between the microphone sensing electrode and a ground node to which a ground voltage is applied, the transistor being controlled by the bias voltage. 3. The method of claim 2,
Wherein the transistor is included in the jack detection circuit. The method according to claim 1,
Further comprising a transistor coupled between the microphone sensing electrode and a ground node to which a ground voltage is applied, the transistor being controlled by a pulse signal. 5. The method of claim 4,
Wherein the pulse signal changes from the low level to the high level when the voltages of the first channel detection electrode and the ground detection electrode become the ground voltage and changes from the high level to the low level after the duty time elapses, . 5. The method of claim 4,
Wherein the transistor is included in the jack detection circuit. The method according to claim 1,
The jack detection circuit comprising:
A comparator that outputs a high level when the voltage of the first channel detection electrode is equal to or higher than the first voltage and outputs a low level when the voltage of the first channel detection electrode is lower than the first voltage; And
And a first pull-up resistor connected between the first channel detection electrode and a power supply node to which a power supply voltage is supplied. 8. The method of claim 7,
The jack detection circuit comprising:
A logic gate circuit configured to perform an OR operation based on an output of the comparator and a voltage of the ground detecting electrode; And
And a second pull-up resistor connected between the ground detection electrode and the power supply node. 9. The method of claim 8,
And when the output of the logic gate circuit becomes a low level, it is detected that the jack is inserted into the jack slot. 9. The method of claim 8,
The jack detection circuit comprising:
Wherein when the output of the logic gate circuit is at a low level, the microphone detecting electrode is connected to a ground node to which a ground voltage is supplied, and if the output of the logic gate circuit is at a high level, Further comprising an audio device. 9. The method of claim 8,
The jack detection circuit comprising:
And a bias voltage generating circuit configured to transmit the bias voltage to the microphone detection electrode if the output of the logic gate circuit is at a low level. 12. The method of claim 11,
And a transistor coupled between the ground detection electrode and the ground node, the transistor operating in response to the bias voltage. 12. The method of claim 11,
And a transistor coupled between the ground detection electrode and the ground node and operative in response to a pulse signal generated based on the output of the logic gate circuit. An application processor configured to perform operation and control operations;
A random access memory used as a main memory of the application processor;
A storage device used as an auxiliary storage device of the application processor;
A video codec configured to process video data under the control of the application processor;
A display configured to display a video signal under control of the video codec;
A jack slot configured to receive an external jack;
An audio codec connected to a first channel electrode, a second channel electrode and a microphone detection electrode of the jack slot, the audio codec being configured to process audio data under the control of the application processor; And
And a jack detection circuit connected to the first channel detection electrode, the ground detection electrode, and the microphone detection electrode of the jack slot,
Wherein the jack detection circuit detects that a jack is inserted in the jack slot when voltages of the first channel detection electrode and the ground detection electrode are a ground voltage and applies a ground voltage to the ground detection electrode in response to the detection And apply a bias voltage to the microphone detection electrode. 15. The method of claim 14,
Wherein the audio codec and the jack detection circuit are implemented as one semiconductor package. 15. The method of claim 14,
A smart phone, a smart pad, a smart television, a smart clock, and a wearable device. And a ground level detecting circuit for detecting a level of the first channel detecting electrode and the ground detecting electrode of the jack slot when the level of at least one of the first channel detecting electrode and the ground detecting electrode is not the ground voltage A logic gate circuit configured to output a two level signal;
A transistor configured to connect the ground detecting electrode with a ground node to which a ground voltage is supplied when the logic gate circuit outputs the first level signal; And
Wherein when the logic gate circuit outputs the first level signal, a bias voltage is transmitted to a microphone detection electrode of the jack slot, and when the logic gate circuit outputs the second level signal, a ground voltage is applied to the microphone detection electrode And a bias voltage generator configured to transmit the bias voltage. 18. The method of claim 17,
The transistor operating in response to the bias voltage. 18. The method of claim 17,
Wherein the transistor transits from a low level to a high level when the output of the logic gate circuit changes from the second level signal to the first level signal and changes from the high level to the low level after the duty time has elapsed An audio device that operates in response to a signal. 18. The method of claim 17,
Further comprising: an audio codec circuit configured to output an audio signal through a first channel electrode, a second channel electrode, and a ground electrode of the jack slot, and to receive an audio signal through the microphone detection electrode.

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