CN211731282U

CN211731282U - Control circuit of vehicle-mounted microphone and vehicle-mounted system

Info

Publication number: CN211731282U
Application number: CN201922371919.2U
Authority: CN
Inventors: 吴宏程; 王丽
Original assignee: Shenzhen Horn Audio Co Ltd
Current assignee: Shenzhen Horn Audio Co Ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-10-23
Anticipated expiration: 2029-12-25

Abstract

A control circuit of a vehicle-mounted microphone and a vehicle-mounted system are provided, wherein the control circuit comprises: multiplexing port, ground port, power supply circuit, microphone, output circuit; the power supply circuit acquires a direct current power supply through the multiplexing port and supplies power to the microphone; the microphone collects environmental sounds according to the direct current power supply and outputs corresponding audio signals; the output circuit processes the audio signal and outputs the processed audio signal; therefore, the embodiment multiplexes the signal transmission function of the multiplexing port, the multiplexing port can transmit electric energy and communication information in a compatible manner, the control circuit can realize the two-wire audio transmission function, and the wiring structure of the audio driver is simplified.

Description

Control circuit of vehicle-mounted microphone and vehicle-mounted system

Technical Field

The application belongs to the technical field of electronic circuits, and particularly relates to a control circuit of a vehicle-mounted microphone and a vehicle-mounted system.

Background

With the improvement of living standard of people, the automobile is provided with an audio playing device, when the audio playing device is connected with electric energy and is in a normal working process, various audio contents can be sent out through the audio playing device, and good hearing experience is brought to people; however, in the process of driving the audio playing device on the automobile by using signals in the conventional technology, considering that the audio playing device needs various types of signals to drive, the audio playing device has a complicated wiring form, for example, the audio playing device in the conventional technology must separate power information and communication information into different ports for transmission; the form of separate transmission of different types of signals can lead to lower sensitivity of audio transmission and smaller sound pickup distance, thus causing the limited placement of the audio playing device in the vehicle-mounted system; the power supply information and the communication information are transmitted separately, and the requirement that the signal line of the automobile adopts a two-line form for transmission cannot be met; therefore, the conventional audio playing device cannot be directly wired and installed when being applied to a vehicle-mounted system, which causes great inconvenience.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the present application provides a control circuit of an on-vehicle microphone and an on-vehicle system, and aims to solve the problems of complex wiring and low transmission sensitivity of a conventional on-vehicle microphone.

A first aspect of an embodiment of the present application provides a control circuit of an in-vehicle microphone, including:

a multiplex port connected to the communication port of the vehicle;

a ground port connected to a ground of the vehicle;

a power circuit coupled to the multiplexed port and configured to obtain a dc power supply from the multiplexed port for powering;

a microphone connected to the power circuit and to the ground port, configured to collect ambient sound and to output a corresponding audio signal; and an output circuit connected to the microphone and the multiplexing port and configured to process and output the audio signal.

In one embodiment thereof, the power supply circuit comprises:

a DC extraction circuit coupled to the multiplexing port and configured to obtain a DC power supply from the multiplexing port for powering;

and the bias amplification circuit is connected with the direct current extraction circuit and the microphone and is configured to amplify the voltage of the direct current power supply and supply power to the microphone.

In one embodiment thereof, the dc extraction circuit comprises: the circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first inductor, a second inductor and a first diode;

the first end of the first capacitor, the first end of the second capacitor and the first end of the first inductor are connected to the multiplexing port in common, and the second end of the first capacitor, the second end of the second capacitor and the first end of the second inductor are connected to the ground port in common;

the second end of the first inductor, the anode of the first diode, the first end of the third capacitor and the first end of the fourth capacitor are connected to the bias amplifying circuit in a sharing mode, and the second end of the third capacitor and the second end of the fourth capacitor are connected to the ground in a sharing mode;

the second end of the second inductor and the cathode of the first diode are connected to the ground in common.

In one embodiment, the bias amplifying circuit includes:

the circuit comprises a first switch tube, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a second diode and an electric energy transmission chip;

the first conducting end of the first switch tube is connected with the direct current extraction circuit, the second conducting end of the first switch tube, the first end of the fifth capacitor, the first end of the fifth resistor and the first end of the ninth capacitor are connected to the first end of the fourth resistor in common, the second end of the fifth capacitor, the control end of the first switch tube, the first end of the first resistor, the first end of the second resistor and the first end of the sixth capacitor are connected to the first end of the seventh capacitor in common, and the second end of the first resistor is grounded;

the second end of the second resistor, the second end of the fourth resistor, the first end of the eleventh capacitor, the first end of the twelfth capacitor and the first end of the thirteenth capacitor are connected to the first end of the third resistor in common, and the second end of the eleventh capacitor, the second end of the twelfth capacitor and the second end of the thirteenth capacitor are connected to ground in common;

a second end of the fifth resistor, a second end of the ninth capacitor and a first end of the tenth capacitor are connected to a first end of the eighth capacitor in common, and a second end of the tenth capacitor is grounded;

the second end of the eighth capacitor is connected with the second end of the seventh capacitor, the second end of the sixth capacitor, the anode of the second diode and the second end of the third resistor are connected to the electric energy input pin of the electric energy transmission chip in a sharing mode, and the electric energy output pin of the electric energy transmission chip is connected with the microphone.

In one embodiment thereof, the output circuit comprises:

an audio amplification circuit connected with the microphone and configured to amplify the audio signal; and

and the audio following circuit is connected between the audio amplifying circuit and the multiplexing port and is configured to follow and output the audio signal after signal amplification.

In one embodiment thereof, the audio follower circuit comprises:

the second switch tube, the fourteenth capacitor, the sixth resistor and the seventh resistor;

a control end of the second switch tube, a first end of the sixth resistor, a first end of the seventh resistor, and a first end of the fourteenth capacitor are all connected to the multiplexing port, and a second end of the sixth resistor, a second end of the seventh resistor, and a second end of the fourteenth capacitor are all connected to ground;

the first conduction end of the second switch tube is connected with the audio amplifying circuit, and the second conduction end of the second switch tube is grounded.

In one embodiment, the method further comprises:

and the voltage detection circuit is connected with the bias amplification circuit and is configured to detect the voltage of the direct current power supply after voltage amplification.

In one embodiment, the method further comprises:

and the voltage display circuit is connected with the voltage detection circuit and is configured to display the voltage of the direct current power supply after the voltage amplification.

In one embodiment, the method further comprises:

the first signal receiving circuit is connected with the bias amplifying circuit and is configured to generate a control signal according to a first key signal;

and the bias amplifying circuit amplifies the voltage of the direct current power supply according to the control signal and supplies power to the microphone.

A second aspect of an embodiment of the present application provides an in-vehicle system, including: a control circuit and microphone as described above, wherein the control circuit and the microphone are connected.

The control circuit of the vehicle-mounted microphone can compatibly realize the functions of electric energy transmission and communication transmission through the multiplexing port, simplifies the driving wiring structure of the microphone, supplies power to the microphone through direct current electric energy output by the multiplexing port, can output audio signals output by the microphone through the multiplexing port, can realize the sensitive audio input and output functions, has a simplified circuit module structure, and reduces the cost of audio transmission and transmission control steps.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a control circuit of an in-vehicle microphone according to an embodiment of the present disclosure;

fig. 2 is a schematic circuit diagram of a dc power extracting circuit according to an embodiment of the present disclosure;

fig. 3 is a schematic circuit structure diagram of a bias amplifier circuit according to an embodiment of the present disclosure;

fig. 4 is a schematic circuit diagram of an audio follower circuit according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a control circuit of an in-vehicle microphone according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of an on-board system according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It should be noted first that, because the communication signal and the power signal belong to two completely different signal types, in order to ensure high-precision transmission of the two signals, the conventional technology uses a communication line to transmit the communication signal, a power line to transmit the power signal, and a ground line to provide a reference voltage, a "three-wire system" is required to implement complete transmission of data, which results in an extremely complex circuit wiring structure of the audio driver and brings great inconvenience to users; based on the embodiment of the application, the complete data transmission is realized by adopting a two-wire system, and the power supply signal and the communication signal are transmitted by multiplexing one wire, so that the circuit wiring structure for audio control of the vehicle-mounted microphone is simplified, and the circuit design and application cost is reduced; specifically, referring to fig. 1, a schematic structural diagram of a control circuit 10 of an on-vehicle microphone provided in the embodiment of the present application only shows a portion related to the embodiment for convenience of description, and the detailed description is as follows:

the control circuit 10 includes: a multiplexed port 101, a ground port 102, a power circuit 103, a microphone 104, and an output circuit 105.

The multiplex port 101 is connected to the communication port of the vehicle.

The ground port 102 is connected to the ground of the vehicle.

Optionally, the multiplexing port 101 is connected to a dc power supply; the communication end of the vehicle realizes the transceiving operation of communication signals through the multiplexing port 101; optionally, the dc power supply is a vehicle-mounted power supply, and then the dc power supply outputs a first power signal, and outputs the first power signal through the multiplexing port 101, so that the embodiment implements compatible transmission of the communication signal and the power signal through the multiplexing port, and different types of signal transmission in the circuit have a more integrated form.

The ground port 102 is used for transmitting a reference voltage to ensure the safety and stability of the electronic components, for example, the potential of the ground port 102 is set as a zero potential.

Power supply circuit 103 is coupled to multiplexed port 101 and draws dc power from multiplexed port 101 for powering.

The power circuit 103 is connected to the multiplexing pause port 101 and the ground port 102, and when the multiplexing port 101 obtains a dc power supply, the dc power supply can directly power on the electronic component, so as to ensure the working stability of the electronic component.

A microphone 104 is connected to the power circuit 103 and to the ground port 102, and is configured to pick up ambient sound and to output a corresponding audio signal.

The power circuit 103 outputs a direct current power supply to nominally power on the microphone 104, so that the microphone 104 can keep a good audio acquisition function; the microphone 104 can collect the environmental sound of the preset environmental region and output corresponding audio and signal signals, so that the audio signals are sensitively and efficiently converted, and the audio collection sensitivity and precision of the microphone 104 are guaranteed.

The output circuit 105 is connected to the microphone 104 and the multiplexing port 101, and configured to process and output an audio signal.

Wherein output circuit 105 can ensure audio signal's compatibility, complete output function, after output circuit 105 handled audio signal to through multiplexing port 101 with the audio signal output after handling to the communication end of vehicle, so that the vehicle can receive the sound of environment in real time, control circuit 10 has higher audio acquisition precision and sensitivity, has satisfied user's actual sense of hearing demand.

As an alternative embodiment, as shown in fig. 1, the power supply circuit 103 includes: a direct current extraction circuit 1031 and a bias amplification circuit 1032; dc extraction circuit 1031 is coupled to multiplexed port 101 and draws dc power from multiplexed port 101 for powering.

Optionally, the direct current extraction circuit 1031 steps down or steps up the direct current power supply to supply power, so that the direct current extraction circuit 1031 has high power transmission accuracy and efficiency; the direct current extraction circuit 1031 can directly get electricity through the multiplexing port 101, compatible output is realized, power supply efficiency and power supply precision of the microphone are guaranteed, and stability of electric energy access of electronic components in the control circuit 10 can be guaranteed through direct current electric energy output by the direct current extraction circuit 1031.

The bias amplification circuit 1032 is connected to the dc current extraction circuit 1031 and the microphone 104, and is configured to amplify the voltage of the dc power supply and supply power to the microphone 104.

Optionally, the bias amplifier circuit 1032 amplifies the voltage of the dc power according to a preset voltage amplification ratio, so as to implement a rated power-on function of the microphone 104.

The bias amplification circuit 1032 can adjust the voltage of the direct current power supply, so that the direct current power supply after voltage amplification can completely meet the working voltage requirement of the microphone 104; in this embodiment, the microphone 104 can be directly powered after the dc electric energy output by the multiplexing port 101 is converted and amplified, so that the power supply efficiency of the microphone 104 is further ensured; when the microphone 104 is successfully powered on, the audio information of the preset environment area can be collected in real time.

As an alternative embodiment, as shown in fig. 1, the output circuit 105 includes: an audio amplifying circuit 1051 and an audio follower circuit 1052, wherein the audio amplifying circuit 1051 is connected with the microphone 104 and is configured to amplify the audio signal.

The audio signal is amplified by the audio amplifying circuit 1051, so that the signal transmission power of the audio signal can be kept, and the phenomenon of signal distortion of the audio signal in the transmission process is avoided; the inside of the control circuit 10 has high audio signal transmission efficiency.

The audio follower circuit 1052 is connected between the audio amplification circuit 1051 and the multiplexing port 101, and is configured to perform following output on the audio signal after signal amplification.

The audio follower circuit 1052 can ensure that the audio signal can be transmitted at constant power, thereby ensuring the transmission quality of the audio signal; the audio follower circuit 1052 outputs the audio signal to the communication terminal of the vehicle through the multiplexing port 101, so that other electronic components on the vehicle can directly acquire the voice information of the surrounding environment, the control circuit 10 can realize the bidirectional transmission of the audio information, and the application range of the control circuit 10 is improved.

Fig. 1 shows a structural schematic diagram of a control circuit 10, a multiplexing port 101 can be used for multiplexing functions of signal transmission to save an audio wiring structure in an audio driving process, a microphone 104 can access electric energy, and after the microphone 104 collects voice information of the surrounding environment of a vehicle, the voice information can be output to a communication end of the vehicle, the control circuit 10 has high audio signal transmission sensitivity and stability, the control circuit 10 has a relatively simplified audio driving wiring structure, the circuit design cost and the application cost of the control circuit 10 are reduced, and the practical value is high; the problems that in the prior art, the circuit wiring structure of the audio playing device of the vehicle is complex, and the audio transmission sensitivity is low are solved.

As an optional implementation manner, fig. 2 shows a schematic circuit structure of the direct current extraction circuit 1031 provided in this embodiment, please refer to fig. 2, the direct current extraction circuit 1031 includes: the inductor comprises a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first inductor L1, a second inductor L2 and a first diode D1.

The first terminal of the first capacitor C1, the first terminal of the second capacitor C2, and the first terminal of the first inductor L1 are all connected to the multiplexing port 101, and the second terminal of the first capacitor C1, the second terminal of the second capacitor C2, and the first terminal of the second inductor L2 are all connected to the ground port 102.

The second terminal of the first inductor L1, the anode of the first diode D1, the first terminal of the third capacitor C3, and the first terminal of the fourth capacitor C4 are commonly connected to the bias amplifier circuit 1032, and the second terminal of the third capacitor C3 and the second terminal of the fourth capacitor C4 are commonly connected to the ground GND.

The second end of the second inductor L2 and the cathode of the first diode D2 are connected to the ground GND.

Therefore, the dc extraction circuit 1031 in this embodiment, in combination with the first capacitor C1 and the second capacitor C2, can implement a filtering transmission function for the dc power supply, and can implement a voltage stabilizing function for the dc power supply through the first diode D1, and can implement an accurate conversion function for the dc power supply by using electronic components inside the dc extraction circuit 1031.

As an alternative implementation, fig. 3 shows a schematic circuit structure of the bias amplifier circuit 1032 provided in this embodiment, and referring to fig. 3, the bias amplifier circuit 1032 includes: the circuit comprises a first switch tube M1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a second diode D2 and an electric energy transmission chip U1.

The first conducting terminal of the first switch tube M1 is connected to the dc extracting circuit 1031, the second conducting terminal of the first switch tube M1, the first terminal of the fifth capacitor C5, the first terminal of the fifth resistor R5 and the first terminal of the ninth capacitor C9 are commonly connected to the first terminal of the fourth resistor R4, the second terminal of the fifth capacitor C5, the control terminal of the first switch tube M1, the first terminal of the first resistor R1, the first terminal of the second resistor R2 and the first terminal of the sixth capacitor C6 are commonly connected to the first terminal of the seventh capacitor C7, and the second terminal of the first resistor R1 is grounded GND.

The second end of the second resistor R2, the second end of the fourth resistor R4, the first end of the eleventh capacitor C11, the first end of the twelfth capacitor C12 and the first end of the thirteenth capacitor C13 are all connected to the first end of the third resistor R3, and the second end of the eleventh capacitor C11, the second end of the twelfth capacitor C12 and the second end of the thirteenth capacitor C13 are all connected to the ground GND.

The second terminal of the fifth resistor R5, the second terminal of the ninth capacitor C9, and the first terminal of the tenth capacitor C10 are all connected to the first terminal of the eighth capacitor C8, and the second terminal of the tenth capacitor C10 is connected to GND.

The second end of the eighth capacitor C8 is connected to the second end of the seventh capacitor C7, the second end of the sixth capacitor C6, the anode of the second diode D2 and the second end of the third resistor R3 are commonly connected to the power input pin of the power transmitting chip U1, and the power output pin of the power transmitting chip U1 is connected to the microphone 104.

Optionally, the first switching tube M1 is an MOS tube or a triode; illustratively, the first switch transistor M1 is a PNP transistor.

Optionally, the type of the power transmission chip U1 is: CRY3225 MIC; therefore, in this embodiment, the electronic components in the bias amplifier circuit 104 can be used to implement a high-precision and real-time voltage amplification function on the second power supply signal, and the power supply circuit 103 has a relatively flexible and simple circuit structure.

As an alternative implementation, fig. 4 shows a schematic circuit structure of the audio follower circuit 107 provided in this embodiment, please refer to fig. 4, where the audio follower circuit 1051 includes: a second switch tube M2, a fourteenth capacitor C14, a sixth resistor R6 and a seventh resistor R7.

The control terminal of the second switch tube M2, the first terminal of the sixth resistor R6, the first terminal of the seventh resistor R7, and the first terminal of the fourteenth capacitor C14 are all connected to the multiplexing port 101, and the second terminal of the sixth resistor R6, the second terminal of the seventh resistor R7, and the second terminal of the fourteenth capacitor C14 are all connected to the ground GND.

The first conducting terminal of the second switch tube M2 is connected to the audio amplifier circuit 1051, and the second conducting terminal of the second switch tube M2 is connected to the ground GND.

Optionally, the second switch tube M2 is an MOS transistor or an audion, for example, the second switch tube M2 is an NPN type audion, a base of the NPN type audion is a control end of the second switch tube M2, a collector of the NPN type audion is a first conducting end of the second switch tube M2, and an emitter of the NPN type audion is a second conducting end of the second switch tube M2.

In this embodiment, each electronic component in the audio follower circuit 1051 is used to maintain the transmission accuracy of the audio signal after signal amplification, thereby avoiding the occurrence of audio signal transmission distortion.

As an alternative implementation, fig. 5 shows another structural schematic of the control circuit 10 provided in this embodiment, and compared with the structural schematic of the control circuit 10 in fig. 1, the control circuit 10 in fig. 5 further includes: a voltage detection circuit 106, a voltage display circuit 107, a first signal receiving circuit 108, and a second signal receiving circuit 109; the voltage detection circuit 108 is connected to the bias amplification circuit 1032, and is configured to detect the voltage of the dc power supply after voltage amplification.

The voltage detection circuit 106 has a voltage detection function, so that when the microphone 104 is connected to the dc power with amplified voltage to realize an audio output function, the voltage detection circuit 106 can detect the magnitude of the power connected to the microphone 104 in real time, and can monitor the voltage amplification state of the bias amplification circuit 1032 in real time according to the voltage detection result of the voltage detection circuit 106, thereby ensuring the power supply stability of the microphone 104.

The voltage display circuit 107 is connected to the voltage detection circuit 106, and is configured to display the voltage of the dc power supply after voltage amplification.

After the voltage detection circuit 106 performs voltage detection on the amplified direct current electric energy and obtains a voltage detection result, the voltage detection result can be displayed in real time through the voltage display circuit 107, so that a user can intuitively learn the voltage accessed by the microphone 104, and good use experience is brought to the user.

The first signal receiving circuit 108 is connected to the bias amplifying circuit 1032 and configured to generate a control signal according to the first key signal.

The bias amplification circuit 1032 amplifies the voltage of the dc power supply according to the control signal, and supplies power to the microphone 104.

Optionally, the first key signal is from a user or an electronic device, where the first key signal includes key information of the user, and the voltage amplification ratio of the bias amplifier circuit 1032 can be changed according to the first key signal, so that the dc power that can be output by the bias amplifier circuit 1032 can meet the working voltage requirement of the microphone 104, and the flexibility of power supply control and the simplicity of operation of the microphone 104 are improved.

The second signal receiving circuit 109 is connected to the microphone 104, and configured to generate a sound pickup control signal according to the second key signal.

The microphone 104 is used for collecting the environmental sound according to the pickup control signal and outputting a corresponding audio signal.

The second key signal contains the key information of the user, and after the second key signal is subjected to signal conversion through the second signal receiving circuit 109, a pickup control signal can be output, the pickup process of the microphone 104 can be controlled based on the pickup control signal, the microphone 104 can efficiently collect the voice information of the surrounding environment of the vehicle under the driving of the pickup control signal, and the voice collection sensitivity and the voice collection efficiency of the microphone 104 are improved.

Fig. 6 shows a structural schematic diagram of the vehicle-mounted system 60 provided in the present embodiment, please refer to fig. 6, the vehicle-mounted system 60 includes the control circuit 10 as described above, wherein the control circuit 10 can supply power to the microphone, and the control circuit 10 can implement an audio information transmission function, so that an internal circuit structure of the vehicle-mounted system 60 is simplified, and cost and steps of audio driving are saved; the problem of vehicle-mounted system internal wiring structure complicated among the conventional art is solved.

Various embodiments are described herein for various devices, circuits, apparatuses, systems, and/or methods. Numerous specific details are set forth in order to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. However, it will be understood by those skilled in the art that the embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have been described in detail so as not to obscure the embodiments in the description. It will be appreciated by those of ordinary skill in the art that the embodiments herein and shown are non-limiting examples, and thus, it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.

Reference throughout the specification to "various embodiments," "in an embodiment," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment," or the like, in places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, a particular feature, structure, or characteristic illustrated or described in connection with one embodiment may be combined, in whole or in part, with features, structures, or characteristics of one or more other embodiments without presuming that such combination is not an illogical or functional limitation. Any directional references (e.g., plus, minus, upper, lower, upward, downward, left, right, leftward, rightward, top, bottom, above …, below …, vertical, horizontal, clockwise, and counterclockwise) are used for identification purposes to aid the reader's understanding of the present disclosure, and do not create limitations, particularly as to the position, orientation, or use of the embodiments.

Although certain embodiments have been described above with a certain degree of particularity, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of this disclosure. Joinder references (e.g., attached, coupled, connected, and the like) are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements. Thus, connection references do not necessarily imply that two elements are directly connected/coupled and in a fixed relationship to each other. The use of "for example" throughout this specification should be interpreted broadly and used to provide non-limiting examples of embodiments of the disclosure, and the disclosure is not limited to such examples. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not limiting. Changes in detail or structure may be made without departing from the disclosure.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.

Claims

1. A control circuit for an in-vehicle microphone, comprising:

a multiplex port connected to the communication port of the vehicle;

a ground port connected to a ground of the vehicle;

2. The control circuit of claim 1, wherein the power circuit comprises:

a DC extraction circuit coupled to the multiplexing port and configured to obtain a DC power supply from the multiplexing port for powering; and

and the bias amplifying circuit is connected with the direct current extracting circuit and the microphone and is configured to amplify the voltage of the direct current power supply and supply power to the microphone.

3. The control circuit of claim 2, wherein the direct current extraction circuit comprises:

the circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first inductor, a second inductor and a first diode;

4. The control circuit of claim 2, wherein the bias amplification circuit comprises:

5. The control circuit of claim 1, wherein the output circuit comprises:

6. The control circuit of claim 5, wherein the audio follower circuit comprises:

7. The control circuit of claim 2, further comprising:

8. The control circuit of claim 7, further comprising:

9. The control circuit of claim 2, further comprising:

10. An in-vehicle system, comprising: the control circuit of claim 1.