Intercom fusion terminal

Abstract

The utility model discloses a talkback fusion terminal. The talkback fusion terminal comprises a circuit mainboard, a circuit daughter board and first input equipment, the circuit main board comprises a circuit main board and a first switch electrically connected with the circuit main board; the circuit daughter board comprises a circuit daughter board, a power supply end and a grounding end; the circuit mainboard is used for realizing a public network talkback function in the talkback fusion terminal; the circuit daughter board is used for realizing a digital mobile talkback function in the talkback fusion terminal; the first input device is a talkback microphone; if the current working mode of the talkback fusion terminal is a digital mobile talkback mode and the first input device detects a first audio signal, the first input device is disconnected with the circuit mainboard through the first switch and is connected with the power supply end and the grounding end of the circuit daughter board through the first switch; and sending the first audio signal through the circuit daughter board. The situation that after the user voice of the talkback fusion terminal is transmitted to the opposite side, the opposite side hears the sudden sound is avoided, and the user experience is improved.

Description

Technical Field

[0001] The present application relates to the field of intercom technology, and in particular to an intercom fusion terminal. Background Art

[0002] Intercom fusion terminal refers to an intercom device that integrates the public network (cellular network) and digital mobile intercom functions. The public network part uses a circuit main board, and the digital mobile intercom module part uses a circuit sub-board (also called DMR board). The two circuit boards are connected by a flexible circuit board.

[0003] In intercom fusion terminals, due to structural limitations, the intercom microphone is generally placed on the circuit board end, the intercom microphone is powered by the circuit board, and the ground signal is also connected to the ground signal of the circuit board. Since the power transmitted by the digital mobile intercom module is generally large, above 2W, the pulse peak current of the DMR board is above 2A when transmitting. In addition, the transmission mode of the power amplifier of the digital mobile intercom module is time division duplex mode, the period of the envelope pulse is 30ms, and the frequency is about 33HZ, which is within the audible range of the human ear. Therefore, this peak current of more than 2A causes a large fluctuation voltage on the power supply and ground wire between the circuit sub-board and the circuit board. This fluctuating voltage difference is received by the intercom microphone detection circuit of the digital mobile intercom module, causing the other party to hear a relatively loud "thump" sound, which seriously affects the user experience. Utility Model Content

[0004] An intercom fusion terminal is provided in an exemplary embodiment of the present application to avoid the situation where the other party hears a "thump" sound after the user's voice of the intercom fusion terminal is transmitted to the other party, thereby improving the user experience.

[0005] According to a first aspect of an exemplary embodiment, there is provided an intercom fusion terminal, the intercom fusion terminal comprising a circuit main board, a circuit sub-board and a first input device;

[0006] The circuit main board includes a circuit main board and a first switch electrically connected to the circuit main board, and the circuit sub-board includes a circuit sub-board, a power supply terminal, and a ground terminal; the circuit main board is used to realize the public network intercom function in the intercom fusion terminal; the circuit sub-board is used to realize the digital mobile intercom function in the intercom fusion terminal; the first input device is an intercom microphone;

[0007] If the current working mode of the intercom fusion terminal is the digital mobile intercom mode, and the first input device detects the first audio signal, the first input device is disconnected from the circuit main board through the first switch, and the first input device is connected to the power supply terminal and the ground terminal of the circuit sub-board through the first switch to send the first audio signal through the circuit sub-board.

[0008] In the embodiment of the present application, the intercom fusion terminal has a public network mode and a digital mobile intercom mode. In the digital mobile intercom mode, there is a situation where the other party hears a "thump" sound. Therefore, a first switch is added to control whether the intercom microphone is connected to the circuit main board or the circuit sub-board. If the current working mode of the intercom fusion terminal is the digital mobile intercom mode, at this time, when the intercom microphone detects the first audio signal, it is disconnected from the circuit main board through the first switch, and connected to the power supply terminal and the ground terminal of the circuit sub-board through the first switch. In this way, since the intercom microphone is not directly connected to the circuit main board, there is no "thump" sound after the other party hears the first audio signal sent through the circuit sub-board. Such a design improves the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0010] Figure 1 The following is a schematic diagram showing the connection relationship between a main circuit board and a sub-circuit board provided in an embodiment of the present application;

[0011] Figure 2 A schematic diagram of intercom microphone connection during DMR intercom in the related art is exemplarily shown;

[0012] Figure 3 A schematic diagram of an intercom microphone connection during a DMR intercom provided in an embodiment of the present application is exemplarily shown;

[0013] Figure 4a A schematic diagram of an intercom fusion terminal provided in an embodiment of the present application is exemplarily shown;

[0014] Figure 4b The circuit diagram of an intercom fusion terminal provided in an embodiment of the present application is exemplarily shown;

[0015] Figure 5 The following is an exemplary block diagram of a circuit for detecting a 3.5mm headphone in the related art;

[0016] Figure 6 The following is an exemplary block diagram of a circuit for detecting a 3.5mm headset and an M6 interface microphone provided in an embodiment of the present application;

[0017] Figure 7 The present invention exemplarily shows a flow chart of a method for public network call and DMR voice control provided in an embodiment of the present application. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0019] For ease of understanding, the terms involved in the embodiments of the present application are explained below:

[0020] (1) The digital trunking communication standard in Digital Mobile Radio (DMR) is an open standard designed and formulated by the European Telecommunications Standards Institute to meet the needs of low-end professional and commercial users in European countries for mobile communications. Therefore, in the embodiment of the present application, the digital mobile radio mode can become the DMR mode, and the signal at the DMR board end can also become the DRM signal.

[0021] (2) Flexible Printed Circuit (FPC) is a highly reliable and extremely flexible printed circuit board made of polyimide or polyester film as the substrate. It has the characteristics of high wiring density, light weight, thin thickness and good bendability.

[0022] (3) GND is the abbreviation of the ground terminal of the wire. This ground is not a real ground, but a ground assumed for application. For the power supply, it is the negative pole of the power supply.

[0023] In the related art, in order to solve the problem of the other party hearing the "thumping" sound in intercom fusion terminals, artificial welding wires are added between the circuit main board and the DMR board to reduce the impedance between the ground wires between the two. This method affects the reliability of the mobile terminal due to the artificial welding wires added internally, increases the difficulty of production operation, and cannot fundamentally solve the problem. That is, even if the power supply and GND lines on the FPC are widened to the maximum extent, due to the contact impedance of the connector on the FPC, there will still be a voltage difference of more than tens of millivolts on the power supply and GND lines between the circuit main board and the circuit sub-board when the DMR transmits at high power.

[0024] To this end, an embodiment of the present application provides an intercom fusion terminal, which includes a circuit main board, a circuit sub-board, a first switch and a first input device. The circuit main board here is used to implement the public network intercom function in the intercom fusion terminal; the circuit sub-board is used to implement the digital mobile intercom function in the intercom fusion terminal; and the first input device is an intercom microphone. If the current working mode of the intercom fusion terminal is the DMR mode, when the intercom microphone detects the first audio signal, the first input device can be disconnected from the circuit main board through the first switch, and then connected to the power supply terminal and the ground terminal of the circuit sub-board to send the first audio signal through the circuit sub-board. Since the signal of the intercom microphone is not directly connected to the circuit main board, that is, it does not depend on the size of the ground impedance between the circuit main board and the DMR board, therefore, when the intercom microphone is used to implement the DMR voice transmission, the other party hears a clean sound without a "thump" sound.

[0025] Figure 1 A schematic diagram of the connection relationship between a circuit main board and a circuit sub-board provided in an embodiment of the present application, wherein the circuit sub-board can also be called a DMR board. The circuit main board and the DRM board are connected via an FPC, and the signals between the circuit main board and the DMR board mainly include the power signal VBAT, the ground signal GND, the microphone input signal MIC-IN, and the DMR voice output signal LINE-OUT. In order to overcome the above problems, two signals MIC-GND and M6-MIC-BIAS are added in the embodiment of the present application,

[0026] In order to better illustrate the problems existing in the related technology, Figure 2 and Figure 3 Provide explanation.

[0027] Figure 2 FIG. 1 is a schematic diagram of a DMR intercom microphone connection in the related art. Figure 2 The problem in Figure 3 A schematic diagram of the intercom microphone connection during DMR intercom provided in an embodiment of the present application. When using DMR intercom, the power supply and GND of the intercom microphone are connected to the DMR board, and the intercom microphone and the circuit main board are not electrically connected. In this way, when the intercom microphone sends voice, the fluctuating voltage between the power supply and GND of the circuit main board and the DMR board will not be superimposed on the intercom microphone path, and the microphone detection circuit of the DMR module receives a relatively clean audio signal, so the other party cannot hear the "thumping" transmission noise.

[0028] To further illustrate the technical solution provided by the embodiment of the present application, this is described in detail below in conjunction with the accompanying drawings and specific implementation methods. Although the embodiment of the present application provides the method operation steps shown in the following embodiments or drawings, more or fewer operation steps may be included in the method based on routine or no creative labor. In the steps where there is no necessary causal relationship logically, the execution order of these steps is not limited to the execution order provided in the embodiment of the present application.

[0029] Combine the following Figure 1-3 The application scenario shown is shown in Figure 4a A schematic diagram of an intercom fusion terminal is shown to illustrate the technical solution provided in an embodiment of the present application.

[0030] Among them, the public network part and the DMR part share an intercom microphone and an intercom hand microphone (hereinafter referred to as hand microphone), that is, the intercom microphone and hand microphone can be connected to both the circuit main board and the DMR board, and switched through analog switches (first switch S1, second switch S2, third switch S3 and fourth switch S4). Usually, the main microphone and the headset are only connected to the circuit main board and used in the public network. The handset mode uses the main microphone to send, and the headset mode uses 3.5mm headset to send. R1-R4 are the bias resistors of the microphone, and the resistance value can be 2.2K.

[0031] For the intercom fusion terminal, it can be divided into data mobile intercom mode (DMR mode) or public network mode. An APP for turning on the DMR mode is built into the intercom fusion terminal. If the APP is detected to be turned on, it can be determined that the current working mode of the intercom fusion terminal is DMR mode. Otherwise, it can be determined that the current working mode of the intercom fusion terminal is in public network mode. In each mode, it can be divided into hands-free mode and peripheral insertion mode, and in each mode, it includes the sending process of audio signals and the receiving process of audio signals. In the signal sending process of the DMR mode, the method of the embodiment of the present application is applied to overcome the sound heard by the other party.

[0032] Figure 4b A circuit diagram of an intercom fusion terminal provided in an embodiment of the present application, combined with Figure 4b , the technical solution of the embodiment of the present application is explained.

[0033] The first mode: digital mobile intercom mode.

[0034] Case 1: Hands-free DMR intercom.

[0035] Here, a first switch, a second switch, a first input device (intercom microphone), and a first output device (speaker) are used.

[0036] For the audio signal sending process:

[0037] When the first input device detects the first audio signal, the first input device is disconnected from the main circuit board through the first switch, and the first input device is connected to the power supply terminal and the ground terminal of the circuit sub-board through the first switch to send the first audio signal through the circuit sub-board.

[0038] The first input device detects that the first audio signal may be a local user saying "Hello, hello, hello" to the intercom microphone. The AUX_MIC_P and AUX_MIC_N of the intercom microphone are connected to NO1 and NO2 of the first switch S1. In this way, the signal of the intercom microphone is connected to the DMR board, and the bias voltage is provided by the power conversion module LDO on the DMR board through the resistor R4. The GND signal (AUX_MIC_N) of the intercom microphone is also connected to the DMR board. In this way, the signal of the intercom microphone is not directly connected to the main board, and the DMR voice (first audio signal) is sent through the intercom microphone. With this design, the other party will not hear the "thump" sound.

[0039] The process of receiving audio signals:

[0040] The second switch and the first output device (speaker) are used here.

[0041] The first output device is disconnected from the main circuit board through the second switch; the first output device is connected to the signal output end of the circuit sub-board through the second switch to play the audio signal output through the signal output end of the circuit sub-board.

[0042] The second switch is controlled to connect COM1 and COM2 of the second switch to NO1 and NO2. At this time, the speaker path is connected to the DMR board to receive DMR voice (that is, the audio signal output by the signal output end of the circuit board).

[0043] Case 2: Use a handheld microphone for DMR intercom.

[0044] For the audio signal sending process:

[0045] The third switch and the fourth switch are used here, the third switch and the fourth switch are connected, the second input device is a hand microphone, and the intercom fusion terminal is in a connected state with the second input device.

[0046] The second input device is disconnected from the circuit main board through the fourth switch, the second input device is connected to the power supply terminal of the circuit sub-board through the fourth switch, and the second input device is connected to the ground terminal of the circuit sub-board through the third switch to send the second audio signal input through the second input device through the circuit sub-board.

[0047] The hand microphone may be an M6 interface. The fourth switch is controlled to connect the M6_HEADMIC_P and M6_HEADMIC_N signals of the hand microphone to NO1 and NO2 of the fourth switch; the third switch is controlled to connect COM1 and COM2 of the third switch to NC1 and NC2 of the third switch, so that the signal of the hand microphone is connected to the DMR board, and the bias voltage is also provided by the LDO on the DMR board through the bias resistor R3, so that the hand microphone realizes the transmission of DMR voice (second audio signal).

[0048] For the audio signal receiving process:

[0049] The second output device is used here, which is a handheld microphone speaker, and the intercom fusion terminal is connected to the second output device.

[0050] The second output device is connected to the signal output terminal of the circuit sub-board through the power amplifier to play the audio signal output through the signal output terminal of the circuit sub-board.

[0051] Among them, the voice receiving signal LINE_OUT of the DMR board is directly connected to the input end of the audio power amplifier of the M6 ​​interface, and the received voice signal of the DMR is amplified and then drives the handheld microphone speaker.

[0052] The second mode: public network intercom mode

[0053] Case 1: Hands-free public network intercom.

[0054] For the audio signal sending process:

[0055] Here, the first input device is used. When the first input device detects the first audio signal, the first input device is disconnected from the circuit sub-board through the first switch, and the first input device is connected to the power supply terminal and the ground terminal of the circuit main board through the first switch to send the first audio signal through the circuit main board.

[0056] Among them, the first input device is an intercom microphone. The first input device detects the first audio signal, which can be the voice of the current intercom fusion terminal user. The first switch is controlled to connect the AUX_MIC_P and AUX_MIC_N signals of the intercom microphone to NC1 and NC2 of the first switch respectively. In this way, the signal of the intercom microphone is connected to the circuit main board, and the bias voltage is also provided by the circuit main board. The intercom microphone realizes the sending of public network voice.

[0057] For the audio signal receiving process:

[0058] The second switch and the first output device are used here, and the first output device is a speaker.

[0059] The first output device is disconnected from the circuit sub-board through the second switch; the first output device is connected to the signal output end of the circuit main board through the second switch to play the audio signal output through the signal output end of the circuit main board.

[0060] The second switch is controlled to connect COM1 and COM2 of the second switch to the second switches NC1 and NC2. At this time, the speaker path is connected to the circuit main board for receiving public network voice.

[0061] Case 2: Use a microphone or headset for public network intercom.

[0062] For the audio signal sending process:

[0063] What are used here are the third switch, the fourth switch and the second input device, and the second input device here can be a hand microphone or a headphone microphone.

[0064] The second input device is disconnected from the circuit sub-board through the fourth switch, and the second input device is connected to the power supply terminal and the ground terminal of the circuit main board through the fourth switch, so as to send the second audio signal input through the second input device through the circuit main board

[0065] Among them, the fourth switch is controlled to connect the M6_HEADMIC_P and M6_HEADMIC_N signals of the hand microphone to NC1 and NC2 of the fourth switch, so that the signal of the hand microphone is connected to the circuit main board, and the bias voltage is also provided by the circuit main board, so that the M6 ​​interface hand microphone realizes the transmission of public network voice.

[0066] For the audio signal receiving process:

[0067] The third output device is an earphone; the third output device is connected to the signal output terminal of the circuit main board to play the audio signal output through the signal output terminal of the circuit main board

[0068] The fourth output device is a hand microphone speaker; the fourth output device is connected to the signal output end of the circuit main board through the power amplifier to play the audio signal output through the signal output end of the circuit main board

[0069] Among them, in order to save costs, the speaker signal of the M6 ​​interface microphone and the 3.5mm headphone receiver share the headphone left channel signal on the circuit motherboard. The voice signal is amplified by an audio power amplifier to drive the microphone speaker for receiving public network voice.

[0070] The intercom fusion terminal in the embodiment of the present application can achieve low noise or no noise for the intercom fusion terminal, realize intercom voice in voice scenarios such as intercom microphones, headphones and hands-free, and freely switch with the call voice on the public network, and can set the priority, completely solving the problem of TDD noise sent by DMR intercom.

[0071] Normally, an intercom fusion terminal will have both a 3.5mm headset and an M6 interface hand microphone. However, in the current circuit main board and software system, from the perspective of the software process, there can generally only be one headphone peripheral. If a set of M6 interface hand microphones or headset detection scenarios is added, the software process will be very troublesome. Therefore, in order to reduce the complexity, in the embodiment of the present application, the circuit structure of the intercom fusion terminal is improved, and the insertion detection mechanism of the 3.5mm headset and the M6 ​​interface hand microphone is optimized.

[0072] Figure 5 This is a circuit block diagram of 3.5mm headphone detection in the related technology, wherein the headphone detection is achieved through the DET pin of the circuit mainboard audio CODEC. When a 3.5mm headphone is inserted, the DET pin is at a low level and an interrupt is generated. After the circuit mainboard detects this interrupt, it starts the setting of the headphone scene call parameters.

[0073] Figure 6 This is a circuit block diagram for detecting a 3.5mm headset and an M6 interface microphone provided in an embodiment of the present application. Compared with the related art, a switch tube is added, and the switch tube can be a MOS tube. Here is just an example, and it can play a switch role. The connection method of the MOS tube is as follows:

[0074] The first end of the switch tube is connected to the first pin of the circuit main board; the first pin is the earphone insertion detection pin; the second end of the switch tube is connected to the first general input and output pin of the circuit main board; the third end of the switch tube is connected to the ground terminal of the circuit main board. The second general input and output pin of the circuit main board is the microphone insertion detection pin; wherein, the first general input and output pin is high level, and the second general input and output pin is low level; the first general input and output pin is low level, and the second general input and output pin is high level.

[0075] Specifically, when a microphone or 3.5mm headphone with M6 interface is inserted, GPIO1 of the circuit main board will be pulled low. After receiving the low-level terminal of GPIO1, GPIO2 will be set to output high-level state. At this time, the switch tube Q1 is turned on, the DET pin of CODEC is set low, and the circuit main board starts the 3.5mm headphone parameter setting process. In this way, the microphone or headphone with M6 interface will be recognized as 3.5mm headphone, sharing a set of voice scenes and audio parameters. At the same time, because GPIO1 is used to detect the intervention of the microphone with M6 interface, the circuit main board will also set the parameters of the audio amplifier with M6 interface to adjust the volume. In this way, through this combined detection logic, the convenience of the software is realized, and the volume of 3.5mm headphone and M6 interface microphone or headphone can be set independently.

[0076] In the embodiment of the present application, without changing the software architecture, a simple combination detection method is adopted to implement the recognition process of the M6 ​​interface microphone or earphone and the 3.5mm.

[0077] In the embodiment of the present application, the intercom fusion terminal has a public network mode and a digital mobile intercom mode. In the digital mobile intercom mode, there is a situation where the other party hears a "thump" sound. Therefore, a first switch is added to control whether the intercom microphone is connected to the circuit main board or the circuit sub-board. If the current working mode of the intercom fusion terminal is the digital mobile intercom mode, at this time, when the intercom microphone detects the first audio signal, it is disconnected from the circuit main board through the first switch, and connected to the power supply terminal and the ground terminal of the circuit sub-board through the first switch. In this way, since the intercom microphone is not directly connected to the circuit main board, there is no "thump" sound after the other party hears the first audio signal sent through the circuit sub-board. Such a design improves the user experience.

[0078] Figure 7 A flowchart of a method for public network call and DMR voice control provided in an embodiment of the present application includes at least the following steps:

[0079] S701: The intercom fusion terminal responds to the user's intercom operation.

[0080] S702: The intercom fusion terminal determines whether the user has enabled the DMR intercom function APP. If so, S703 is executed; otherwise, S704 is executed.

[0081] S703: The intercom fusion terminal detects whether a microphone or earphone is connected. If so, execute S705; otherwise, execute S706.

[0082] S704: The intercom fusion terminal switches the path to the public network call channel.

[0083] S705: The intercom fusion terminal controls the analog switch to switch the DMR intercom voice to the hand microphone or earphone channel, and uses the hand microphone or earphone to realize the intercom voice.

[0084] S706: The intercom fusion terminal controls the analog switch to switch the DMR intercom voice to the speaker and intercom microphone channel, and uses the speaker and intercom microphone to implement intercom voice.

[0085] In the embodiment of the present application, the switching of the public network channel and the DMR channel is realized by controlling the module switch, and then when the DMR channel is working, the analog switch is controlled to be disconnected from the circuit main board, thereby preventing the other party from hearing the "thumping" noise.

[0086] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. An intercom fusion terminal, characterized in that: It includes a main circuit board, a sub-circuit board, a first switch and a first input device; The circuit main board is used to implement the public network intercom function in the intercom fusion terminal; the circuit sub-board is used to implement the digital mobile intercom function in the intercom fusion terminal; the first input device is an intercom microphone; If the current working mode of the intercom fusion terminal is the digital mobile intercom mode, and the first input device detects a first audio signal, the first input device is disconnected from the circuit main board through the first switch, and the first input device is connected to the power supply terminal and the ground terminal of the circuit sub-board through the first switch to send the first audio signal through the circuit sub-board.

2. The intercom fusion terminal according to claim 1, characterized in that: The intercom fusion terminal further includes a second switch and a first output device, wherein the first output device is a speaker; The first output device is disconnected from the circuit main board through the second switch; the first output device is connected to the signal output end of the circuit sub-board through the second switch to play the audio signal output through the signal output end of the circuit sub-board.

3. The intercom fusion terminal according to claim 1, characterized in that: The intercom fusion terminal further includes a third switch and a fourth switch electrically connected to the third switch; the intercom fusion terminal is in a connected state with a second input device, and the second input device is a hand microphone; If the current working mode of the intercom fusion terminal is the digital mobile intercom mode, the second input device is disconnected from the circuit main board through the fourth switch, the second input device is connected to the power supply terminal of the circuit sub-board through the fourth switch, and the second input device is connected to the ground terminal of the circuit sub-board through the third switch to send the second audio signal input through the second input device through the circuit sub-board.

4. The intercom fusion terminal according to claim 3, characterized in that: The intercom fusion terminal is in a connected state with a second output device; the second output device is a handheld microphone speaker; The second output device is connected to the signal output end of the circuit sub-board through a power amplifier to play the audio signal output through the signal output end of the circuit sub-board.

5. The intercom fusion terminal according to claim 1, characterized in that: If the current working mode of the intercom fusion terminal is the public network intercom mode, and the first input device detects a first audio signal, the first input device is disconnected from the circuit sub-board through the first switch, and the first input device is connected to the power supply terminal and the ground terminal of the circuit main board through the first switch to send the first audio signal through the circuit main board.

6. The intercom fusion terminal according to claim 5, characterized in that: The intercom fusion terminal further includes a second switch and a first output device, wherein the first output device is a speaker; The first output device is disconnected from the circuit sub-board through the second switch; the first output device is connected to the signal output end of the circuit main board through the second switch to play the audio signal output through the signal output end of the circuit main board.

7. The intercom fusion terminal according to claim 1, characterized in that: The intercom fusion terminal further includes a third switch and a fourth switch electrically connected to the third switch; the intercom fusion terminal is in a connected state with a second input device, and the second input device is a handheld microphone or a headphone microphone; If the current working mode of the intercom fusion terminal is the public network intercom mode, the second input device is disconnected from the circuit sub-board through the fourth switch, and the second input device is connected to the power supply terminal and the ground terminal of the circuit main board through the fourth switch to send the second audio signal input through the second input device through the circuit main board.

8. The intercom fusion terminal according to claim 7, characterized in that: The intercom fusion terminal is in a connected state with a third output device, and the third output device is an earphone receiver; The third output device is connected to the signal output end of the circuit main board to play the audio signal output through the signal output end of the circuit main board.

9. The intercom fusion terminal according to claim 7, characterized in that: The intercom fusion terminal is in a connected state with a fourth output device, and the fourth output device is a handheld microphone speaker; The fourth output device is connected to the signal output end of the circuit main board through the power amplifier to play the audio signal output through the signal output end of the circuit main board.

10. The intercom fusion terminal according to any one of claims 1 to 9, characterized in that: The intercom fusion terminal also includes a switch tube; The first end of the switch tube is connected to the first pin of the circuit main board; the first pin is a headphone insertion detection pin; The second end of the switch tube is connected to the first general input / output pin of the circuit main board; The third end of the switch tube is connected to the ground end of the circuit main board; The second general input and output pin of the circuit main board is a microphone insertion detection pin; Among them, the first general input and output pin is at a high level, and the second general input and output pin is at a low level; the first general input and output pin is at a low level, and the second general input and output pin is at a high level.

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