WO2016004897A1

WO2016004897A1 - Audio insert automatic wake-up device and audio insert automatic wake-up method

Info

Publication number: WO2016004897A1
Application number: PCT/CN2015/083784
Authority: WO
Inventors: 刘士影
Original assignee: 国民技术股份有限公司
Priority date: 2014-07-11
Filing date: 2015-07-10
Publication date: 2016-01-14
Also published as: CN105282653B; CN105282653A

Abstract

The present invention discloses an audio insert automatic wake-up device, comprising: an audio interface, a detection circuit, and a control circuit. The two input terminals of the detection circuit are connected to the third pin and fourth pin of the audio interface, respectively; when the audio insert automatic wake-up device is connected to an audio terminal equipment, electrical signals of the two input terminals are processed, then a wake-up signal is outputted to the control circuit; the detection circuit automatically connects the ground pin to the ground; the control circuit connects to the two output terminals of the detection circuit to receive the wake-up signal outputted by the detection circuit, so that the system enters a normal operating state; of the third pin and fourth pin, the pin serving as the microphone pin and the pin serving as the ground pin are detected and identified. The present invention also discloses an audio insert automatic wake-up method; by means of the described scheme, the present invention accomplishes identification of a microphone pin and a ground pin, automatic wake-up of an audio insert automatic wake-up device, and an audio terminal equipment and audio insert automatic wake-up device having a common ground.

Description

Audio insertion automatic wake-up device and audio insertion automatic wake-up method

Technical field

The present invention relates to the field of electronics, and in particular to an audio insertion automatic wake-up device and an audio insertion automatic wake-up method.

Background technique

With the advancement of technology and the rapid rise of the Internet, miniaturized mobile terminals such as mobile phones, tablet computers and handheld computers have gradually become mainstream consumer products in the market due to their convenience. At present, people's daily lives are inseparable from mobile terminals such as smart phones and tablet computers. These mobile terminals are often audio terminal devices with audio interfaces, and data transmission and interaction are often required between them. However, these mobile terminals generally It only contains two interfaces of USB interface and audio interface, and the USB interface of the mobile terminal belongs to the slave device interface, and its use is limited. Therefore, how to use the audio interface for data transmission and interaction has become a research hotspot.

The audio interface of the existing mobile terminal is generally a four-segment audio interface, including a left channel pin, a right channel pin, a MIC pin and a GND pin, wherein the left channel pin and the right channel The pin connection order is fixed, and the connection order of the MIC pin and the GND pin is not fixed. There are two general standards. In the two general standards, the MIC pin and the GND pin are connected in the reverse order, thus resulting in an audio interface. The MIC pin and GND pin are undefined. Moreover, existing terminals cannot automatically wake up when they are connected to each other by using an audio interface, which is disadvantageous. For energy savings. In addition, existing terminals cannot achieve active common ground between the two when they are connected to each other by using an audio interface.

Therefore, there is a need to provide an audio insertion automatic wake-up device and an audio insertion automatic wake-up method to solve the above problem.

Summary of the invention

The technical problem to be solved by the present invention is to provide an audio insertion automatic wake-up device and an audio insertion automatic wake-up method, which can solve the problem that the system cannot automatically recognize the audio terminal device after detecting the insertion of the audio terminal device in the prior art by using the audio interface communication. The connection order of the MIC pin and the GND pin does not automatically wake up, and the technical problems of the common ground cannot be automatically realized.

In order to solve the above technical problem, a technical solution adopted by the present invention is to provide an audio insertion automatic wake-up device for connecting with an audio terminal device and performing data interaction or transmission, including: an audio interface, a detection circuit, and a control circuit. The audio interface is used for connecting to an audio interface of the audio terminal device, wherein the audio interface includes a first pin, a second pin, a third pin, and a fourth pin, and the first pin and the second pin respectively serve as Left channel pin and right channel pin, and one of the third pin and the fourth pin acts as a microphone pin (MIC pin) and the other acts as a ground pin (GND pin); The detecting circuit comprises two input ends and two output ends, wherein two input ends of the detecting circuit are respectively connected to the third pin and the fourth pin in the audio interface, so as to be connected to the audio terminal device in the audio insertion automatic wake-up device When the detection circuit processes the electrical signals of the two inputs, the wake-up signal is output to the control circuit, and the detection circuit automatically connects the ground pin to the ground to implement the audio. The terminal device and the audio insertion automatic wake-up device are common; the control circuit is connected to the two outputs of the detection circuit to receive the wake-up signal output by the detection circuit to make the system enter a normal working state, and detect and identify the third pin and the fourth pin. Which is the microphone pin, which is the ground pin, and the control circuit is further connected to the first pin and the second pin of the audio interface to process the received audio signal.

The audio insertion automatic wake-up device further includes a power supply circuit that connects the detection circuit and the control circuit to supply power to the detection circuit and the control circuit.

Wherein, the detecting circuit comprises a common ground circuit and a voltage comparing circuit, and the common ground circuit is connected to the third pin and the fourth pin in the audio interface through the two input ends of the detecting circuit to insert the automatic wake-up device and the audio in the audio When the terminal is connected, the third pin or the fourth pin as the ground pin is automatically connected to the ground; the voltage comparison circuit is disposed between the two input ends and the two output ends of the detecting circuit to automatically wake up in the audio insertion. When the device is connected to the audio terminal, the electrical signals of the two input terminals of the detection circuit are processed to output a wake-up signal to the control circuit to wake up the control circuit to bring the system into a normal working state.

The common ground circuit includes a first switching element including a control end, a first path end, and a second path end, wherein the control end of the first switching element is connected to the second end of the detecting circuit An input end, a first path end of the first switching element is connected to the first input end of the detecting circuit, and a second path end of the first switching element is grounded; the second switching element includes a control end, a first path end and a second path An end, wherein a control end of the second switching element is connected to the first input end of the detecting circuit, a first path end of the second switching element is connected to the second input end of the detecting circuit, and a second path end of the second switching element Grounding; wherein the first switching element and the second switching element are transistors of the same type.

Wherein, the first switching element and the second switching element are NMOS transistors.

The voltage comparison circuit includes: a first voltage comparator and a second voltage comparator, the first voltage comparator includes a non-inverting input terminal, an inverting input terminal, and an output terminal, wherein the positive phase input terminal of the first voltage comparator Connecting the first input end of the detecting circuit, the inverting input end of the first voltage comparator is connected to the reference voltage, and the output end of the first voltage comparator is used as the first output end of the detecting circuit; the second voltage comparator comprises the positive phase input a terminal, an inverting input terminal and an output terminal, wherein a non-inverting input terminal of the second voltage comparator is connected to the second input terminal of the detecting circuit, and an inverting input terminal of the second voltage comparator is connected to the reference voltage, and the second voltage is compared The output of the device acts as the second output of the detection circuit.

The control circuit comprises a filter circuit, an analog switch circuit, a gain amplifying circuit and an MCU main control circuit, and the filter circuit is connected to the first pin and the second pin of the audio interface to connect with the audio terminal device in the audio insertion automatic wake-up device Receiving, by the first pin and the second pin of the audio interface, the audio signal output by the audio terminal device and filtering the audio signal; the analog switch circuit is connected to the filter circuit for performing the audio insertion automatic wake-up device and the audio terminal device When connected, the audio signal output by the left channel pin and the right channel pin of the audio terminal device is received by the first and second pins of the filter circuit and the audio interface; the gain amplifying circuit is connected to the analog switch a circuit for amplifying the received audio signal; the MCU main control circuit is connected to the gain amplifier circuit, the analog switch circuit, and the third pin and the fourth pin of the audio interface, wherein the MCU main control circuit is used for detecting and identifying the third Which of the pin and the fourth pin acts as a microphone pin, which acts as a ground pin and passes through the audio interface The third pin and the fourth pin and the audio signal to the audio processing after the terminal device.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide an audio insertion automatic wake-up method, which comprises: connecting an audio interface of an audio terminal device with an audio interface of an audio insertion automatic wake-up device; The detection circuit of the device processes the electrical signals of the two input terminals to output a wake-up signal, and automatically connects the ground pin to the ground by using the detection circuit to realize the audio terminal device and the audio insertion automatic wake-up device; using the audio insertion to automatically wake up The control circuit of the device receives the wake-up signal to bring the system into a normal working state, and detects which of the third pin and the fourth pin of the audio interface is recognized as a microphone pin, which is used as a ground pin, and the audio is controlled by the control circuit. The audio signals received by the first pin and the second pin of the interface are processed.

Wherein, the voltage comparison circuit of the detection circuit processes the electrical signals of the two input ends of the detection circuit and outputs a wake-up signal to the control circuit.

Wherein, the control circuit is connected to the two output ends of the detecting circuit to receive the wake-up signal outputted by the detecting circuit to make the system enter the normal working state, and detect which of the third pin and the fourth pin is recognized as the microphone pin, which is As a ground pin.

Wherein, the common ground circuit of the detecting circuit automatically connects the ground pin to the ground to realize the audio terminal device and the audio insertion automatic wake-up device.

The invention has the beneficial effects that the invention is different from the prior art, and the invention is connected to the third pin and the fourth pin in the audio interface through two input ends of the detecting circuit, and the automatic wake-up device and the audio terminal are inserted in the audio. When the device is connected, the detection circuit processes the electrical signals of the two input terminals to output a wake-up signal, and the detection circuit automatically connects the ground pin to the ground to realize the audio terminal device and the audio insertion automatic wake-up device, and the control circuit is detected according to the detection. Electrical signal detection at the two outputs of the circuit identifies the third and fourth pins Which of them is used as a microphone pin and as a ground pin, thereby enabling recognition of a microphone pin and a ground pin, an automatic wake-up audio insertion automatic wake-up device, and an audio terminal device and an audio insertion automatic wake-up device.

DRAWINGS

1 is a block diagram of an audio insertion automatic wake-up device of the present invention;

2 is a schematic diagram showing the circuit structure of the detecting circuit of FIG. 1;

Figure 3 is a block diagram of the control circuit of Figure 1;

4 is a flow chart of an audio insertion automatic wake-up method of the present invention.

detailed description

The invention will now be described in detail in conjunction with the drawings and embodiments.

Please refer to FIG. 1 , FIG. 2 and FIG. 3 , wherein FIG. 1 is a schematic diagram of a module of an audio insertion automatic wake-up device of the present invention, FIG. 2 is a schematic diagram of a circuit structure of the detection circuit of FIG. 1 , and FIG. 3 is a control circuit of FIG. Schematic diagram of the module. In this embodiment, the audio insertion automatic wake-up device is used for connecting with the audio terminal device for data interaction or transmission, and the audio insertion automatic wake-up device includes: the power supply circuit 10, the audio interface 11, the detection circuit 12, and the control circuit 13. In this embodiment, the audio insertion automatic wake-up device may be an audio KEY, an access device, etc. In other embodiments, the audio insertion automatic wake-up device may also be other devices. In this embodiment, the audio terminal device may be a smart phone, a tablet computer, or the like. In other embodiments, other terminal devices with an audio interface may also be used.

The power supply circuit 10 is connected to the detection circuit 12 and the control circuit 13 to detect the circuit 12 Power is supplied to the control circuit 13.

The audio interface 11 is configured to be connected to an audio interface of the audio terminal device, wherein the audio interface 11 includes a first pin 111, a second pin 112, a third pin 113, and a fourth pin 114, and the first pin 111 And the second pin 112 serves as a left channel pin and a right channel pin, respectively, and one of the third pin 113 and the fourth pin 114 serves as a microphone pin (MIC pin), and the other As a ground pin (GND pin). It will be understood by those skilled in the art that when the audio insertion automatic wake-up device is connected to the audio terminal device by using the audio interface 11, the first pin 111 and the second pin 112 in the audio interface 11 can respectively be connected to the audio terminal device. The left channel pin and the right channel pin are connected to each other regardless of the MIC pin and the GND pin in the audio terminal device, which are respectively the third reference in the audio interface 11 of the audio insertion automatic wake-up device. The foot 113 and the fourth pin 114 form a connection.

The detection circuit 12 includes two

input terminals

121, 122 and two

output terminals

123, 124, wherein the two

input terminals

121, 122 of the detection circuit are respectively connected to the third pin 113 and the fourth pin 114 in the audio interface 11. .

Preferably, the detection circuit 12 includes a common ground circuit 20, a voltage comparison circuit 21, and a voltage input circuit 22.

The common ground circuit 20 is connected to the third pin 113 and the fourth pin 114 in the audio interface 11 through the two

input terminals

121, 122 of the detecting circuit 12 to automatically connect when the audio insertion automatic wake-up device is connected to the audio terminal. The third pin 113 or the fourth pin 114, which is a ground pin, is connected to the ground.

Specifically, the common ground circuit 20 includes a first switching element N1 and a second switching element N2, The first switching element N1 includes a control terminal 2011, a first path end 2012, and a second path end 2013. The control terminal 2011 of the first switching element N1 is connected to the second input terminal 122 of the detection circuit 12, and the first path end 2012 of the first switching element N1 is connected to the first input terminal 121 of the detection circuit 12, preferably, The first path end 2012 of a switching element N1 is connected to the first input terminal 121 via a third resistor R3 of the voltage input circuit 22, and the second path end 2013 of the first switching element N1 is grounded. The second switching element N2 includes a control terminal 2021, a first path end 2022, and a second path end 2023. The control terminal 2021 of the second switching element N2 is connected to the first input terminal 121 of the detection circuit 12, and the first path end 2022 of the second switching element N2 is connected to the second input terminal 122 of the detection circuit 12, preferably, The first path end 2022 of the second switching element N2 is connected to the second input terminal 122 through the fifth resistor R5 of the voltage input circuit 22, and the second path end 2023 of the second switching element N2 is grounded. Preferably, the first switching element N1 and the second switching element N2 are transistors of the same type. More preferably, the first switching element N1 and the second switching element N2 are NMOS transistors, the first path end 2012 of the first switching element N1 is the gate of the NMOS transistor, the second path end 2013 is the source, and the control terminal 2014 is The drain, the first pass terminal 2022 of the second switching element N2 is the gate of the NMOS transistor, the second via terminal 2023 is the source, and the control terminal 2024 is the drain. The common ground circuit 20 automatically connects the ground pin to ground to implement the audio terminal device and the audio insertion automatic wake-up device.

The following describes the working principle of the common ground circuit: when the first input terminal 121 of the detecting circuit 12 is connected to the ground pin and the second input terminal 122 is connected to the microphone pin, the first path of the first switching element N1 The terminal 2012 and the second path end 2013 are turned on, and the first path end 2022 of the second switching element N2 and the second path end 2023 are turned off, thereby implementing the connection. The ground pin is grounded. Similarly, when the first input terminal 121 of the detecting circuit 12 is connected to the microphone pin and the second input terminal 122 is connected to the ground pin, the first path end of the second switching element N2 The second path end 2023 is turned on, and the first path end 2012 and the second path end 2013 of the first switching element N1 are turned off, thereby implementing grounding pin grounding. Therefore, the common ground circuit 20 of the embodiment realizes automatic The ground pin is connected to ground.

The voltage comparison circuit 21 is disposed between the two

input terminals

121, 122 and the two

output terminals

123, 124 of the detection circuit 12 for pairing the two inputs of the detection circuit 12 when the audio insertion automatic wake-up device is connected to the audio terminal The electrical signals of 121, 122 are processed to output a wake-up signal to the control circuit 13 to wake up the control circuit 13, thereby causing the system to enter a normal operating state.

Preferably, the voltage comparison circuit 21 includes a first voltage comparator A, a second voltage comparator B, a reference voltage circuit 211, a fourth resistor R4, and a sixth resistor R6. The first voltage comparator A comprises a non-inverting input, an inverting input and an output, wherein the non-inverting input of the first voltage comparator A is connected to the first input 121 of the detection circuit 12, preferably the first voltage The non-inverting input of comparator A is coupled to first input 121 via a third resistor R3 of voltage input circuit 22. The inverting input of the first voltage comparator A is connected to the reference voltage, and the output of the first voltage comparator A serves as the first output 123 of the detection circuit 12. The second voltage comparator B includes a non-inverting input, an inverting input and an output, wherein the non-inverting input of the second voltage comparator B is coupled to the second input 122 of the detection circuit 12, preferably the second voltage The non-inverting input terminal of the comparator B is connected to the second input terminal 122 through the fifth resistor R5 of the voltage input circuit 22, the inverting input terminal of the second voltage comparator B is connected to the reference voltage, and the output of the second voltage comparator B is connected. Terminal as detection circuit The second output 124 of 12. The input terminal of the reference voltage circuit 211 is connected to the power supply circuit 10, and the output terminal of the reference voltage circuit 211 is connected to the inverting input terminals of the first voltage comparator A and the second voltage comparator B to provide a reference voltage. In the present embodiment, the first input end 121 of the detecting circuit 12 is connected to the third pin 113 of the audio interface 11, and the second input end 122 of the detecting circuit 12 is connected to the fourth pin 114 of the audio interface 11.

Preferably, the reference voltage circuit 211 includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is connected to the power supply circuit 10 as an input end of the reference voltage circuit 211, and the second end of the first resistor R2 is connected to the second end. The first end of the resistor R2, the second end of the second resistor R2 is grounded, and the first end of the second resistor R2 serves as an output end of the reference voltage circuit 211.

Preferably, the fourth resistor R4 is connected to the non-inverting input of the first voltage comparator A, and the fourth resistor R4 is a pull-down resistor. The first end of the fourth resistor R4 is connected to the non-inverting input terminal, and the second end of the fourth resistor R4 is grounded.

Preferably, the sixth resistor R6 is connected to the non-inverting input of the second voltage comparator B, and the sixth resistor R6 is a pull-down resistor. The first end of the sixth resistor R6 is connected to the non-inverting input terminal, and the second end of the sixth resistor R6 is grounded.

The voltage input circuit 22 includes a first input terminal 121, a second input terminal 122, a third resistor R3, and a fifth resistor R5 of the detection circuit 12. The first end 121 of the third resistor R3 serves as the first input 121 of the detection circuit 12, and the first end 122 of the fifth resistor R5 serves as the second input 122 of the detection circuit 12.

Preferably, the second end of the third resistor R3 is connected to the non-inverting input of the first voltage comparator A.

Preferably, the second end of the fifth resistor R5 and the positive phase input of the second voltage comparator B connection.

It should be noted that, in other embodiments, the resistances of the first voltage comparator A and the second voltage comparator B and the connection manner thereof may be changed according to actual needs, which is not limited by the present invention, for example, voltage input. The circuit 22 and the reference voltage circuit 211 may have other configurations.

The control circuit 13 includes a filter circuit 30, an analog switch circuit 31, a gain amplifying circuit 32, and an MCU master circuit 33. The control circuit 13 is further connected to the first pin 111 and the second pin 112 of the audio interface 11.

Specifically, the filter circuit 30 is connected to the first pin 111 and the second pin 112 of the audio interface 11 to pass through the first pin 111 and the first of the audio interface 11 when the audio insertion automatic wake-up device is connected to the audio terminal device The two pins 112 receive the audio signal output by the audio terminal device and filter the audio signal.

The analog switch circuit 31 is connected to the filter circuit 30 to receive the audio terminal by the filter circuit 30 and the first pin 111 and the second pin 112 of the audio interface 11 when the audio insertion automatic wake-up device is connected to the audio terminal device. Audio signal output from the left and right channel pins of the device.

The gain amplifying circuit 32 is connected to the analog switch circuit 31 to perform amplification processing on the received audio signal.

The MCU main control circuit 33 is connected to the gain amplifying circuit 32, the analog switch circuit 31, and the third pin 113 and the fourth pin 114 of the audio interface 11, wherein the MCU main control circuit 33 is for detecting and identifying the third pin 113 and the Which of the four pins 114 acts as a microphone pin, which acts as a ground pin, and passes through the third pin 113 and the fourth pin of the audio interface 11 The processed audio signal is transmitted to the audio terminal device. Preferably, the MCU main control circuit 33 can perform path selection control on the analog switch circuit 31 through an address selection signal, and the MCU main control circuit 33 can digitally control the gain amplifying circuit 32 to control its amplification factor.

The operation of the audio insertion automatic wake-up apparatus of this embodiment will be described below.

Since the connection order of the microphone pin and the ground pin of the audio interface of different audio terminal devices is uncertain, the third pin 113 and the fourth pin are connected when the audio terminal device and the audio insertion automatic wake-up device are connected through the audio interface. One of the 114s serves as a microphone pin (MIC pin) and the other as a ground pin (GND pin), but is not sure of the third pin 113 and the fourth pin 114 in the audio interface 11. Which is used as a microphone pin and which is used as a ground pin. When the audio terminal device is connected to the audio insertion automatic wake-up device through the audio interface, the common ground circuit 20 in the detection circuit 12 of the audio insertion automatic wake-up device automatically connects the ground pin to ground (the principle is as described above). Next, the control circuit 13 detects, based on the electrical signals of the two

output terminals

123, 124 of the detection circuit 12, which of the third pin and the fourth pin is identified as a microphone, preferably based on the voltage signals of the two

output terminals

123, 124. The pin, which is the ground pin, if the first output 123 of the detection circuit 12 is a high voltage signal or a pulse signal and the second output 124 of the detection circuit 12 is always a low voltage signal, the control circuit 13 identifies the third reference The foot 113 is a microphone pin, and the fourth pin 114 is a ground pin. Otherwise, if the first output end 123 of the detecting circuit 12 is always a low voltage signal and the second input end 124 of the detecting circuit 12 is a high voltage signal or a pulse signal Then, the control circuit 13 recognizes that the third pin 113 is a ground pin, and the fourth pin 114 is a microphone pin.

The detecting circuit 12 processes the electrical signals of the two

input terminals

121 and 122 to output a wake-up signal. Preferably, the wake-up signal is a pulse signal or a high-power output of the first output terminal 123 or the second output terminal 124 of the detecting circuit 12. Flat signal. Therefore, in the present embodiment, the pulse signal or the high level signal is used as a signal for detecting which of the third pin 113 and the fourth pin 114 is used as a ground pin, and also as a wake-up signal, and is controlled. The circuit 13 is connected to the two

output terminals

123, 124 of the detection circuit 12 to receive the wake-up signal output from the detection circuit 12 and the control circuit 13 is woken up after receiving the wake-up signal, thereby causing the system to enter a normal operating state, and the control circuit 13 is not receiving The control enters a low power state when the wake-up signal is reached, thereby causing the system to enter a low power state, and finally the control circuit 13 processes the received audio signals from the first pin 111 and the second pin 112. In this embodiment, the system refers to a system in which an audio is inserted into an automatic wake-up device or a system in which an audio is inserted into an automatic wake-up device and an audio terminal device, which is not limited in this embodiment.

Please refer to FIG. 4. FIG. 4 is a flowchart of the audio insertion automatic wake-up method of the present invention. In this embodiment, the audio insertion automatic wake-up method includes the following steps:

Step S11: The audio interface of the audio terminal device is connected to the audio interface of the audio insertion automatic wake-up device.

Step S12: The detection circuit of the audio insertion automatic wake-up device processes the electrical signals of the two input terminals to generate a wake-up signal, and automatically connects the ground pin to the ground by using the detection circuit to realize the audio terminal device and the audio insertion automatic wake-up device. Ground.

In step S12, for example, the voltage comparison circuit 21 of the detection circuit 12 processes the electrical signals of the two input terminals of the detection circuit 12, and outputs a wake-up signal. The common ground circuit 20 of the test circuit 12 automatically connects the ground pin to ground to implement the audio terminal device and the audio insertion automatic wake-up device.

Step S13: receiving a wake-up signal by using a control circuit of the audio insertion automatic wake-up device to cause the system to enter a normal working state, and detecting which of the third pin and the fourth pin of the audio interface is used as a microphone pin, which is used as a grounding lead And the control circuit is used to process the audio signals received by the first pin and the second pin of the audio interface.

In this embodiment, the foregoing method may be implemented by the foregoing audio insertion automatic wake-up device, and details are not described herein again.

Different from the prior art, the present invention connects the third pin and the fourth pin of the audio interface respectively through two input ends of the detecting circuit, and detects the circuit pair when the audio insertion automatic wake-up device is connected with the audio terminal device. The electrical signals of the two input terminals are processed to output a wake-up signal, and the detecting circuit automatically connects the grounding pin to the ground to realize the audio terminal device and the audio insertion automatic wake-up device, and the control circuit is based on the electric power of the two output terminals of the detecting circuit. The signal detection identifies which of the third pin and the fourth pin is used as a microphone pin, and which serves as a ground pin, thereby enabling identification of the microphone pin and the ground pin, automatic wake-up audio insertion, automatic wake-up device, and implementation of the audio terminal device. And the audio is inserted into the automatic wake-up device.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims

An audio insertion automatic wake-up device for connecting to an audio terminal device for data interaction or transmission, characterized in that the audio insertion automatic wake-up device comprises: an audio interface, a detection circuit and a control circuit, the audio interface is used for Connecting with an audio interface of the audio terminal device, wherein the audio interface includes a first pin, a second pin, a third pin, and a fourth pin, the first pin and the second pin The pins are respectively a left channel pin and a right channel pin, and one of the third pin and the fourth pin is used as a microphone pin (MIC pin), and the other is used as a ground. a pin (GND pin); the detection circuit includes two input terminals and two output terminals, wherein two input terminals of the detection circuit are respectively connected to the third pin and the a fourth pin for processing an electrical signal of the two input terminals to output a wake-up signal to the control circuit when the audio insertion automatic wake-up device is connected to the audio terminal device, and the detecting circuit Automatically The ground pin is connected to ground to implement the audio terminal device and the audio insertion automatic wake-up device; the control circuit is coupled to the two outputs of the detection circuit to receive the output of the detection circuit The wake-up signal causes the system to enter a normal working state, and detects which of the third pin and the fourth pin is recognized as a microphone pin, which is the ground pin, and the control circuit further connects the The first pin and the second pin of the audio interface process the received audio signal.
The audio insertion automatic wake-up device according to claim 1, wherein Further includes:

a power supply circuit connecting the detection circuit and the control circuit to supply power to the detection circuit and the control circuit.
The audio insertion automatic wake-up device according to claim 2, wherein the detection circuit comprises:

a common ground circuit connected to the third pin and the fourth pin of the audio interface through two inputs of the detecting circuit to be connected to the audio terminal at the audio insertion automatic wake-up device Automatically connecting the third pin or the fourth pin as the ground pin to the ground;

a voltage comparison circuit disposed between the two input ends and the two output ends of the detection circuit to perform electrical signals on the two input terminals when the audio insertion automatic wake-up device is connected to the audio terminal A wake-up signal is output to the control circuit after processing to wake up the control circuit to cause the system to enter a normal operating state.
The audio insertion automatic wake-up device according to claim 3, wherein the common ground circuit comprises:

a first switching element including a control end, a first path end and a second path end, wherein a control end of the first switching element is coupled to a second input end of the detection circuit, the first switching element a first path end connected to the first input end of the detecting circuit, and a second path end of the first switching element being grounded;

a second switching element including a control end, a first path end, and a second path end, wherein a control end of the second switching element is connected to a first input end of the detection circuit, a first path end of the second switching element is connected to a second input end of the detection circuit, and the second switch The second path end of the component is grounded;

Wherein, the first switching element and the second switching element are transistors of the same type.
The audio insertion automatic wake-up device according to claim 4, wherein said first switching element and said second switching element are NMOS transistors.
The audio insertion automatic wake-up device according to claim 3, wherein the voltage comparison circuit comprises:

a first voltage comparator comprising a non-inverting input, an inverting input, and an output, wherein a non-inverting input of the first voltage comparator is coupled to a first input of the detection circuit, the first An inverting input terminal of the voltage comparator is connected to the reference voltage, and an output end of the first voltage comparator is used as a first output end of the detecting circuit;

a second voltage comparator comprising a non-inverting input, an inverting input and an output, wherein a non-inverting input of the second voltage comparator is coupled to a second input of the detection circuit, the second An inverting input of the voltage comparator is coupled to the reference voltage, and an output of the second voltage comparator is coupled to a second output of the detection circuit.
The audio insertion automatic wake-up device according to claim 1, wherein the control circuit comprises:

a filter circuit connecting the first pin and the second pin of the audio interface to communicate when the audio insertion automatic wake-up device is connected to the audio terminal device Receiving an audio signal output by the audio terminal device and filtering the audio signal through the first pin and the second pin of the audio interface;

An analog switch circuit coupled to the filter circuit to pass the filter circuit and the first pin and the first portion of the audio interface when the audio insertion automatic wake-up device is connected to the audio terminal device Receiving, by the second pin, the audio signal output by the left channel pin and the right channel pin of the audio terminal device;

a gain amplifying circuit connected to the analog switch circuit to perform amplification processing on the received audio signal;

An MCU main control circuit, connected to the gain amplifying circuit, the analog switch circuit, and the third pin and the fourth pin of the audio interface, wherein the MCU main control circuit is configured to detect an identification Which of the third pin and the fourth pin is the microphone pin, which is handled as the ground pin and through the third pin and the fourth pin of the audio interface The latter audio signal is transmitted to the audio terminal device.
An audio insertion automatic wake-up method, characterized in that the method comprises:

Connecting the audio interface of the audio terminal device to the audio interface of the audio insertion automatic wake-up device;

The detection circuit of the audio insertion automatic wake-up device processes the electrical signals of the two inputs thereof to output a wake-up signal, and automatically connects the ground pins to the ground by the detection circuit to implement the audio terminal device and the The audio is inserted into the automatic wake-up device;

Receiving, by the control circuit of the audio insertion automatic wake-up device, the wake-up signal causes the system to enter a normal working state, and detecting which of the third pin and the fourth pin of the audio interface is recognized as a microphone pin, which is a ground pin, and the audio signal received by the first pin and the second pin of the audio interface is processed by the control circuit.
The audio insertion automatic wake-up method according to claim 8, wherein the voltage comparison circuit of the detection circuit processes the electrical signals of the two input ends of the detection circuit, and outputs a wake-up signal to the control circuit. The control circuit is woken up to bring the system into a normal operating state.
The audio insertion automatic wake-up method according to claim 9, wherein the grounding pin is automatically connected to the ground by the common ground circuit of the detecting circuit to realize automatic wake-up of the audio terminal device and the audio insertion The device is common.