Underground audio broadcasting device and method

Abstract

The invention provides an underground audio broadcasting device and method. The underground audio broadcasting device comprises a plurality of voice slave stations which are connected in series through a current loop; each voice slave station comprises a left port for receiving a first audio current signal input by an upstream voice slave station and sending the first audio current signal to a left audio receiving module; the left audio receiving module is used for converting the first audio current signal into a first audio voltage signal and respectively sending the first audio voltage signal to the right audio sending module and the sound amplification circuit module; the right side audio sending module converts the received first audio voltage signal into a first audio current signal and sends the first audio current signal to a right side port; the right side port is used for sending the first audio current signal to a downstream voice slave station; the sound amplification circuit module outputs the received first audio voltage signal to the loudspeaker; the design of the current loop significantly improves the anti-interference capability of the system, thereby ensuring the stable transmission of audio signals.

Description

Technical Field

[0001] The present invention relates to the field of intelligent mining technology, and in particular to an underground audio broadcasting device and method. Background Art

[0002] The underground audio broadcasting system is an important part of the coal mine three-machine centralized control system, which is mainly used to realize long-distance voice communication along the coal mine working face or tunnel. These systems are usually composed of dozens of substations, one of which sends the voice, and other substations receive and amplify it through loudspeakers.

[0003] Traditional audio transmission systems mainly use analog voltage transmission technology, which is widely used due to its simple structure, low latency, high reliability and low power consumption. However, the traditional underground voice transmission system uses voltage transmission, which has a simple structure but poor anti-interference ability. In the complex electromagnetic environment of various large electric mechanical equipment underground, it is very easy to be interfered, resulting in poor audio transmission quality and the sound quality cannot be effectively guaranteed. Summary of the invention

[0004] The present invention provides an underground audio broadcasting device and method, which are used to solve the defects of the voltage transmission method in the prior art, which has a simple structure but poor anti-interference ability.

[0005] The present invention provides an underground audio broadcasting device, comprising a plurality of voice slave stations connected in series through a current loop; each voice slave station comprises: The left port is used to receive the first audio current signal input by the upstream voice slave station and send it to the left audio receiving module; the left audio receiving module is used to convert the first audio current signal into a first audio voltage signal, and send the first audio voltage signal to the right audio sending module and the sound amplification circuit module respectively; the right audio sending module is used to convert the received first audio voltage signal into a first audio current signal, and send it to the right port; the right port is used to send the first audio current signal to the downstream voice slave station; the sound amplification circuit module is used to output the received first audio voltage signal to the loudspeaker.

[0006] According to the underground audio broadcasting device provided by the present invention, the right side port receives the second audio current signal input by the downstream voice slave station, and sends the second audio current signal to the right side audio receiving module; the right side audio receiving module converts the second audio current signal into a second audio voltage signal, and sends the second audio voltage signal to the left side audio sending module and the sound amplification circuit module respectively; the sound amplification circuit module outputs the second audio voltage signal to the loudspeaker, and the left side audio sending module converts the second audio voltage signal into a second audio current signal, and sends it to the left side port; the left side port sends the second audio current signal to the upstream voice slave station.

[0007] The underground audio broadcasting device provided by the present invention further includes: a microphone amplification module; When the third audio voltage signal is input through the microphone, the third audio voltage signal is received through the microphone amplification module; the third audio voltage signal is converted into a third audio current signal via the left audio sending module, and the third audio current signal is sent to the upstream voice slave station via the left port; the third audio voltage signal is converted into a third audio current signal via the right audio sending module, and the third audio current signal is sent to the downstream voice slave station via the right port.

[0008] The underground audio broadcasting device provided by the present invention further includes: other sound source input modules; When the fourth audio voltage signal is input through other audio source input modules, the fourth audio voltage signal is sent to the sound amplification circuit module, the left audio sending module and the right audio sending module respectively; Outputting the fourth audio voltage signal to the loudspeaker through the loudspeaker circuit module; Convert the fourth audio voltage signal into a fourth audio current signal via the left audio sending module, and send the fourth audio current signal to the upstream voice slave station via the left port; The fourth audio voltage signal is converted into a fourth audio current signal via the right audio sending module, the fourth audio current signal is sent to the right port, and the fourth audio current signal is sent to the downstream voice slave station via the right port.

[0009] The underground audio broadcasting device provided by the present invention further includes: an analog channel switching module; In an initial state, the left port is connected to the left audio receiving module, and the right port is connected to the right audio receiving module; When a first audio current signal is received via the left port, the left audio receiving module is controlled by the analog channel switching module to communicate with the right audio sending module and the sound amplification circuit module respectively; In the case where the second audio current signal is received via the right port, the analog channel switching module controls the right audio receiving module to be connected to the left audio sending module and the sound amplification circuit module respectively.

[0010] According to the underground audio broadcasting device provided by the present invention, for adjacent upstream voice slave stations and downstream voice slave stations, their interconnected left ports and right ports are connected by a voice receiving line and a voice sending line, so as to simultaneously realize sending of a first audio current signal to a left audio receiving module of the downstream voice slave station through the voice sending line by the right audio sending module of the upstream voice slave station, and receiving of a second audio current signal sent by the left audio sending module of the downstream voice slave station through the voice receiving line by the right audio receiving module of the upstream voice slave station.

[0011] According to the underground audio broadcasting device provided by the present invention, the right audio sending module of the upstream voice slave station includes: a current control circuit, which receives a first audio voltage signal sent by the left audio sending module of the upstream voice slave station, generates a first audio current signal according to the first audio voltage signal, and sends the first audio current signal to the left audio receiving module of the downstream voice slave station via the voice sending line; The left audio receiving module of the downstream voice slave station includes: A sampling circuit receives the first audio current signal for sampling to obtain a sampling voltage, and sends the sampling voltage to a voltage follower amplifier circuit; The voltage follower amplifier circuit performs amplification processing according to the sampled voltage to generate an amplified first audio voltage signal, and sends the amplified first audio voltage signal to the right audio sending module of the downstream voice slave station.

[0012] According to the underground audio broadcasting device provided by the present invention, for each adjacent upstream voice slave station and downstream voice slave station, the interconnected left port and right port are connected through a positive power line, a common ground line, and a voice transceiver line; so as to realize that the second audio current signal sent by the left audio sending module of the downstream voice slave station is received from the right audio receiving module of the upstream voice slave station via the voice transceiver line; or the first audio current signal is sent from the right audio sending module of the upstream voice slave station to the left audio receiving module of the downstream voice slave station via the voice transceiver line.

[0013] According to the underground audio broadcasting device provided by the present invention, the right audio sending module of the upstream voice slave station includes: a current control circuit, which receives a first audio voltage signal sent by the left audio sending module of the upstream voice slave station, generates a first audio current signal according to the first audio voltage signal, and sends the first audio current signal to the left audio receiving module of the downstream voice slave station via the voice sending line; The left audio receiving module of the downstream voice slave station includes: A sampling circuit receives the first audio current signal for sampling to obtain a sampling voltage, and sends the sampling voltage to a voltage comparator and a voltage follower amplifier circuit respectively; a voltage comparator, generating a control signal according to the sampled voltage to switch the mode of sending the first audio current signal from the upstream voice slave station to the downstream voice slave station or sending the second audio current signal from the downstream voice slave station to the upstream voice slave station; The voltage follower amplifier circuit performs amplification processing according to the sampled voltage to generate an amplified first audio voltage signal, and sends the amplified first audio voltage signal to the right audio sending module of the downstream voice slave station.

[0014] The present invention also provides an underground audio broadcasting method, the method comprising: When the current voice slave station receives a first audio current signal input from an upstream voice slave station via the left port, the first audio current signal is sent to the left audio receiving module; Converting the first audio current signal into a first audio voltage signal through the left audio receiving module, and sending the first audio voltage signal to the right audio sending module and the sound amplification circuit module respectively; Outputting the first audio voltage signal to a loudspeaker through the loudspeaker circuit module; The first audio voltage signal is converted into a first audio current signal by the right audio sending module, and the first audio current signal is sent to a downstream voice slave station.

[0015] The underground audio broadcasting device and method provided by the present invention, when the current voice slave station receives the first audio current signal input by the upstream voice slave station via the left port, sends the first audio current signal to the left audio receiving module; converts the first audio current signal into a first audio voltage signal through the left audio receiving module, and sends the first audio voltage signal to the right audio sending module and the sound amplification circuit module respectively; outputs the first audio voltage signal to the loudspeaker through the sound amplification circuit module; converts the first audio voltage signal into a first audio current signal through the right audio sending module, and sends the first audio current signal to the downstream voice slave station. Compared with the traditional voltage transmission method, the current transmission method is less sensitive to electromagnetic interference. In a complex electromagnetic environment such as underground coal mines where there are a large number of electric mechanical equipment, the design of the current loop significantly improves the anti-interference ability of the system, thereby ensuring the stable transmission of audio signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is one of the working status diagrams of the underground audio broadcasting device provided in an embodiment of the present invention.

[0018] Figure 2 This is the second working status diagram of the underground audio broadcasting device provided in an embodiment of the present invention.

[0019] Figure 3 This is the third working status diagram of the underground audio broadcasting device provided in an embodiment of the present invention.

[0020] Figure 4 This is the fourth working status diagram of the underground audio broadcasting device provided in an embodiment of the present invention.

[0021] Figure 5 This is the fifth working status diagram of the underground audio broadcasting device provided in an embodiment of the present invention.

[0022] Figure 6 It is a schematic diagram of full-duplex audio communication provided by an embodiment of the present invention.

[0023] Figure 7 It is a schematic diagram of half-duplex audio communication provided by an embodiment of the present invention.

[0024] Figure 8 It is a schematic diagram of sending a first audio current signal provided by an embodiment of the present invention.

[0025] Fig. 9 It is a flowchart of the underground audio broadcasting method provided by an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 101—left port; 102—left audio receiving module; 103—left audio sending module; 104—right side port; 105—right side audio receiving module; 106—right side audio sending module; 107—sound amplification circuit module; 108—microphone amplification module; 109—other audio source input module; 110—power management module. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Combine the following Figure 1-Figure 8 The downhole audio broadcasting device according to the embodiment of the present invention is described. The downhole audio broadcasting device according to the embodiment of the present invention comprises a plurality of voice slave stations connected in series through a current loop.

[0029] See also Figure 1 Each voice slave station mainly includes: a left port 101 and a left audio receiving module 102 and a left audio sending module 103 respectively connected to the left port 101, a right port 104 and a right audio receiving module 105 and a right audio sending module 106 respectively connected to the right port 104, and a sound amplification circuit module 107.

[0030] For the voice slave station, the left port 101 is connected to the upstream voice slave station, and the right port 104 is connected to the downstream voice slave station.

[0031] In addition, the voice slave station also includes: Microphone amplifier module 108: used to receive audio signals input through the microphone. Since the signals output by the microphone are usually very weak, they need to be amplified before they can be further processed or transmitted by the system. The function of the microphone amplifier module is to enhance these weak audio signals to a level suitable for subsequent processing circuits.

[0032] Other audio source input module 109: allows other audio sources (such as music players, broadcasting systems, etc.) other than microphones to be connected to the audio broadcasting device. It allows the system to receive and process audio signals from these other audio sources, increasing the flexibility and applicability of the system.

[0033] Power management module 110: It ensures that all components can obtain appropriate voltage and current, and may also include power protection functions such as overload protection, short circuit protection, etc. to prevent power problems from causing damage to the system.

[0034] Analog channel switching module (not shown in the figure): switches the connection between different modules according to the input signals of different modules.

[0035] Specifically, for each voice slave station, it includes: The left port 101 is used to receive the first audio current signal inputted by the upstream voice slave station and send it to the left audio receiving module; The left audio receiving module 102 is used to convert the first audio current signal into a first audio voltage signal, and send the first audio voltage signal to the right audio sending module 106 and the sound amplification circuit module 107 respectively; The right audio sending module 106 is used to convert the received first audio voltage signal into a first audio current signal and send it to the right port 104; The right port 104 is used to send the first audio current signal to a downstream voice slave station; The loudspeaker circuit module 107 is configured to output the received first audio voltage signal to a loudspeaker. Figure 1 In an initial state, the left port 101 is connected to the left audio receiving module 102 , and the right port 104 is connected to the right audio receiving module 105 .

[0036] See also Figure 2 When the first audio current signal is received via the left port 101 , the left audio receiving module 102 is controlled by the analog channel switching module to be connected to the right audio sending module 106 and the sound amplification circuit module 107 .

[0037] See also Figure 3 When the second audio current signal is received via the right port 104 , the right audio receiving module 105 is controlled by the analog channel switching module to be connected to the left audio sending module 103 and the sound amplification circuit module 107 .

[0038] Receive a second audio current signal input from a downstream voice slave station through the right port 104, and send the second audio current signal to the right audio receiving module 105; The right audio receiving module 105 converts the second audio current signal into a second audio voltage signal, and sends the second audio voltage signal to the left audio sending module 103 and the sound amplifying circuit module 107 respectively. The sound amplifying circuit module 107 outputs the second audio voltage signal to the loudspeaker.

[0039] The left audio sending module 103 converts the second audio voltage signal into a second audio current signal and sends it to the left port 101 ; the left port 101 sends the second audio current signal to the upstream voice slave station.

[0040] The underground audio broadcasting device provided by the embodiment of the present invention sends the first audio current signal to the left audio receiving module when the current voice slave station receives the first audio current signal input by the upstream voice slave station via the left port; converts the first audio current signal into a first audio voltage signal through the left audio receiving module, and sends the first audio voltage signal to the right audio sending module and the sound amplification circuit module respectively; outputs the first audio voltage signal to the loudspeaker through the sound amplification circuit module; converts the first audio voltage signal into a first audio current signal through the right audio sending module, and sends the first audio current signal to the downstream voice slave station. Compared with the traditional voltage transmission method, the current transmission method is less sensitive to electromagnetic interference. In a complex electromagnetic environment such as underground coal mines where there are a large number of electric mechanical equipment, the design of the current loop significantly improves the anti-interference ability of the system, thereby ensuring the stable transmission of audio signals.

[0041] See also Figure 4 When the third audio voltage signal is input through the microphone, the microphone amplification module 108 is controlled by the analog channel switching module to be connected to the left audio sending module 103 and the right audio sending module 106 respectively.

[0042] When the third audio voltage signal is input through the microphone, the third audio voltage signal is received by the microphone amplification module 108; the third audio voltage signal is converted into a third audio current signal via the left audio sending module 103, and the third audio current signal is sent to the upstream voice slave station via the left port 101; the third audio voltage signal is converted into a third audio current signal via the right audio sending module 106, and the third audio current signal is sent to the downstream voice slave station via the right port.

[0043] See also Figure 5 When the fourth audio voltage signal is input through the other audio source input module, the other audio source input module 109 is controlled by the analog channel switching module to be connected to the sound amplification circuit module 107, the left audio sending module 103 and the right audio sending module 106 respectively.

[0044] When the fourth audio voltage signal is input through the other audio source input module 109, the fourth audio voltage signal is sent to the sound amplification circuit module 107, the left audio sending module 103 and the right audio sending module 106 respectively; the fourth audio voltage signal is output to the loudspeaker through the sound amplification circuit module 107; the fourth audio voltage signal is converted into a fourth audio current signal via the left audio sending module 103, and the fourth audio current signal is sent to the upstream voice slave station via the left port 101; the fourth audio voltage signal is converted into a fourth audio current signal via the right audio sending module 106, the fourth audio current signal is sent to the right port 104, and the fourth audio current signal is sent to the downstream voice slave station via the right port 104.

[0045] The underground audio broadcasting device proposed in the embodiment of the present invention may include two audio transmission modes: using two audio transmission lines (voice receiving line and voice transmitting line) to realize two-way full-duplex analog audio communication, or using one audio transmission line (voice transmitting and receiving line) to realize two-way half-duplex analog audio communication, and the quality of the transmitted audio can be effectively guaranteed.

[0046] See also Figure 6 For the adjacent upstream voice slave station and the downstream voice slave station, the left port and the right port connected to each other are connected through the voice receiving line and the voice sending line. In addition, the power management module 110 of the adjacent upstream voice slave station and the power management module 110 of the downstream voice slave station are connected through the positive power line and the common ground line. In the underground audio broadcasting device formed in this way, the adjacent voice slave stations are composed of four lines, namely the positive power line, the common ground line, the voice receiving line and the voice sending line, so that full-duplex audio communication can be realized.

[0047] Since there are both voice receiving lines and voice transmitting lines, it is possible to simultaneously send the first audio current signal to the left audio receiving module 102 of the downstream voice slave station through the voice transmitting line through the right audio sending module 106 of the upstream voice slave station, and receive the second audio current signal sent by the left audio sending module 103 of the downstream voice slave station through the voice receiving line through the right audio receiving module 105 of the upstream voice slave station.

[0048] In this architecture, the process of sending the first audio current signal to the left audio receiving module 102 of the downstream voice slave station via the voice transmission line by the right audio sending module 106 of the upstream voice slave station is implemented as follows: The right audio sending module 106 of the upstream voice slave station includes: a current control circuit, which receives the first audio voltage signal sent by the left audio sending module 103 of the upstream voice slave station, generates a first audio current signal according to the first audio voltage signal, and sends the first audio current signal to the left audio receiving module 102 of the downstream voice slave station via the voice transmission line.

[0049] The left audio receiving module 102 of the downstream voice slave station includes: A sampling circuit receives the first audio current signal for sampling, obtains a sampling voltage, and sends the sampling voltage to a voltage follower amplifier circuit; The voltage follower amplifier circuit performs amplification processing according to the sampled voltage to generate an amplified first audio voltage signal, and sends it to the right audio sending module 106 of the downstream voice slave station.

[0050] In this embodiment, the current control circuit in the right audio transmission module 106 of the upstream voice slave station may include one or more operational amplifiers for converting the received audio voltage signal into a corresponding current signal. The design of this circuit can ensure that the amplitude of the current signal is proportional to the input audio voltage signal, thereby maintaining the fidelity of the audio signal.

[0051] In this embodiment, the current control circuit and the voltage follower amplifier circuit work together to effectively transmit the audio signal from the upstream voice slave station to the downstream voice slave station, thereby improving the efficiency of signal transmission.

[0052] In addition, relatively speaking, the process of receiving the second audio current signal sent by the left audio sending module 103 of the downstream voice slave station through the voice receiving line by the right audio receiving module 105 of the upstream voice slave station specifically includes: The left audio sending module 103 of the downstream voice slave station includes: a current control circuit, which receives a second audio voltage signal sent by the right audio receiving module 105 of the downstream voice slave station, generates a second audio current signal according to the second audio voltage signal, and sends the second audio current signal to the right audio receiving module 105 of the upstream voice slave station via the voice receiving line.

[0053] The right audio receiving module 105 of the upstream voice slave station includes: A sampling circuit receives the second audio current signal for sampling to obtain a sampling voltage, and sends the sampling voltage to a voltage follower amplifier circuit; The voltage follower amplifier circuit performs amplification processing according to the sampled voltage to generate an amplified second audio voltage signal, and sends it to the right audio sending module 106 of the upstream voice slave station.

[0054] In another architecture, see Figure 7 For each adjacent upstream voice slave station and downstream voice slave station, the left port and the right port connected to each other are connected through the positive power line, the common ground line, and the voice transceiver line. In the underground audio broadcasting device formed in this way, the adjacent voice slave stations are composed of three lines through the positive power line, the common ground line, and the voice transceiver line, which can realize half-duplex audio communication.

[0055] Since there is only one voice transceiver line connected, this line needs to switch between sending and receiving according to the system status, so only half-duplex audio communication can be achieved, that is, only sending or receiving audio current signals can be performed at the same time, not at the same time. Specifically, it can be achieved that the right audio receiving module 105 of the upstream voice slave station receives the second audio current signal sent by the left audio sending module 103 of the downstream voice slave station via the voice transceiver line; or the right audio sending module 106 of the upstream voice slave station sends the first audio current signal to the left audio receiving module 102 of the downstream voice slave station via the voice transceiver line.

[0056] See also Figure 8 , Figure 8 It is a schematic diagram showing that a first audio current signal is sent from the right audio transmitting module 106 of the upstream voice slave station to the left audio receiving module 102 of the downstream voice slave station via the voice transceiver line.

[0057] The right audio sending module 106 of the upstream voice slave station includes: a current control circuit, which receives the first audio voltage signal sent by the left audio sending module 103 of the upstream voice slave station, generates a first audio current signal according to the first audio voltage signal, and sends the first audio current signal to the left audio receiving module 102 of the downstream voice slave station via the voice transmission line.

[0058] The left audio receiving module 102 of the downstream voice slave station includes: The sampling circuit receives the first audio current signal and samples it to obtain a sampling voltage, and sends the sampling voltage to the voltage comparator and the voltage follower amplifier circuit respectively.

[0059] The voltage comparator generates a control signal according to the sampled voltage to switch the mode of sending the first audio current signal from the upstream voice slave station to the downstream voice slave station or sending the second audio current signal from the downstream voice slave station to the upstream voice slave station. Specifically, the control signal can be sent to the analog channel management module. In the half-duplex audio communication mode, by controlling the mode change of each end: when the left port needs to send the first audio voltage signal, the left receiving module works and the left sending module does not work; correspondingly, when the right port needs to receive the first audio voltage signal, the right receiving module does not work and the right sending module works.

[0060] The voltage follower amplifier circuit performs amplification processing according to the sampled voltage to generate an amplified first audio voltage signal, and sends the amplified first audio voltage signal to the right audio sending module 106 of the downstream voice slave station.

[0061] In summary, the technical effects that can be achieved by the embodiments of the present invention are as follows: Improve anti-interference ability: By adopting a current loop to transmit audio signals, the underground audio broadcasting device of the present application can significantly improve the ability to resist electromagnetic interference, ensuring the stable transmission of audio signals in complex electromagnetic environments such as underground coal mines.

[0062] Improve audio transmission quality: The current loop design helps reduce signal attenuation and distortion, thereby improving the quality of audio transmission, making voice clearer and effectively ensuring sound quality.

[0063] Realize two-way audio communication: Each voice slave station in the device is equipped with audio receiving and sending modules, supporting two-way audio communication, so that underground workers can conduct effective two-way communication.

[0064] Simplified system structure: The current loop transmission method is adopted to reduce the need for complex wiring, simplify the system structure, and reduce the difficulty of installation and maintenance.

[0065] Enhanced system reliability: The stability and anti-interference ability of the current loop improves the reliability of the entire audio broadcasting system and reduces the problem of communication interruption or sound quality degradation caused by interference.

[0066] Low power consumption design: Compared with the traditional voltage transmission method, the current loop transmission method can control power consumption more effectively and is suitable for energy-constrained environments such as underground.

[0067] The downhole audio broadcasting method provided by an embodiment of the present invention is described below. The downhole audio broadcasting method described below and the downhole audio broadcasting device described above can be referenced to each other.

[0068] The embodiment of the present invention provides an underground audio broadcasting method, see Fig. 9 ,include: 901. When the current voice slave station receives a first audio current signal input from an upstream voice slave station via a left port, the first audio current signal is sent to a left audio receiving module.

[0069] In the initial state, the left port is connected to the left audio receiving module, and the right port is connected to the right audio receiving module; when the first audio current signal is received via the left port, the left audio receiving module is controlled by the analog channel switching module to be connected to the right audio sending module and the sound amplification circuit module respectively.

[0070] 902. Convert the first audio current signal into a first audio voltage signal through the left audio receiving module, and send the first audio voltage signal to the right audio sending module and the sound amplification circuit module respectively.

[0071] 903. Output the first audio voltage signal to a loudspeaker through the loudspeaker circuit module.

[0072] 904. Convert the first audio voltage signal into a first audio current signal through the right audio sending module, and send the first audio current signal to the downstream voice slave station. The underground audio broadcasting method provided by the embodiment of the present invention sends the first audio current signal to the left audio receiving module when the current voice slave station receives the first audio current signal input by the upstream voice slave station via the left port; convert the first audio current signal into a first audio voltage signal through the left audio receiving module, and send the first audio voltage signal to the right audio sending module and the sound amplification circuit module respectively; output the first audio voltage signal to the loudspeaker through the sound amplification circuit module; convert the first audio voltage signal into a first audio current signal through the right audio sending module, and send the first audio current signal to the downstream voice slave station. Compared with the traditional voltage transmission method, the current transmission method is less sensitive to electromagnetic interference. In a complex electromagnetic environment such as underground coal mines where there are a large number of electric mechanical equipment, the design of the current loop significantly improves the anti-interference ability of the system, thereby ensuring the stable transmission of audio signals.

[0073] Optionally, when the current voice slave station receives the second audio current signal input by the downstream voice slave station via the right-side port, the second audio current signal is sent to the right-side audio receiving module; the right-side audio receiving module converts the second audio current signal into a second audio voltage signal, and sends the second audio voltage signal to the left-side audio sending module and the sound amplification circuit module respectively; the sound amplification circuit module outputs the second audio voltage signal to the loudspeaker, and the left-side audio sending module converts the second audio voltage signal into a second audio current signal, and sends it to the left-side port; the left-side port sends the second audio current signal to the upstream voice slave station.

[0074] In the case where the second audio current signal is received via the right port, the analog channel switching module controls the right audio receiving module to be connected to the left audio sending module and the sound amplification circuit module respectively.

[0075] Optionally, when a third audio voltage signal is input through a microphone, the third audio voltage signal is received through a microphone amplification module; the third audio voltage signal is converted into a third audio current signal via a left audio sending module, and the third audio current signal is sent to an upstream voice slave station via a left port; the third audio voltage signal is converted into a third audio current signal via a right audio sending module, and the third audio current signal is sent to a downstream voice slave station via a right port.

[0076] Optionally, when the fourth audio voltage signal is input through other audio source input modules, the fourth audio voltage signal is sent to the sound amplification circuit module, the left audio sending module and the right audio sending module respectively; the fourth audio voltage signal is output to the loudspeaker through the sound amplification circuit module; the fourth audio voltage signal is converted into a fourth audio current signal via the left audio sending module, and the fourth audio current signal is sent to the upstream voice slave station via the left port; the fourth audio voltage signal is converted into a fourth audio current signal via the right audio sending module, the fourth audio current signal is sent to the right port, and the fourth audio current signal is sent to the downstream voice slave station via the right port.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An underground audio broadcasting device, characterized in that: It includes a plurality of voice slave stations connected in series through a current loop; each voice slave station includes: The left port is used to receive the first audio current signal inputted by the upstream voice slave station and send it to the left audio receiving module; The left audio receiving module is used to convert the first audio current signal into a first audio voltage signal, and send the first audio voltage signal to the right audio sending module and the sound amplification circuit module respectively; A right audio sending module, used for converting the received first audio voltage signal into a first audio current signal, and sending the first audio current signal to a right port; a right port, for sending the first audio current signal to a downstream voice slave station; The loudspeaker circuit module is used to output the received first audio voltage signal to a loudspeaker.

2. The underground audio broadcasting device according to claim 1, characterized in that: The right port receives a second audio current signal input from a downstream voice slave station, and sends the second audio current signal to a right audio receiving module; The right audio receiving module converts the second audio current signal into a second audio voltage signal, and sends the second audio voltage signal to the left audio sending module and the sound amplification circuit module respectively; The amplifying circuit module outputs the second audio voltage signal to the loudspeaker. The left audio sending module converts the second audio voltage signal into a second audio current signal and sends it to the left port; The left port sends the second audio current signal to an upstream voice slave station.

3. The underground audio broadcasting device according to claim 1, characterized in that: Also includes: Microphone amplifier module; When the third audio voltage signal is input through the microphone, the third audio voltage signal is received through the microphone amplification module; the third audio voltage signal is converted into a third audio current signal via the left audio sending module, and the third audio current signal is sent to the upstream voice slave station via the left port; the third audio voltage signal is converted into a third audio current signal via the right audio sending module, and the third audio current signal is sent to the downstream voice slave station via the right port.

4. The underground audio broadcasting device according to claim 1, characterized in that: Also includes: Other audio source input modules; When the fourth audio voltage signal is input through other audio source input modules, the fourth audio voltage signal is sent to the sound amplification circuit module, the left audio sending module and the right audio sending module respectively; Outputting the fourth audio voltage signal to the loudspeaker through the loudspeaker circuit module; Convert the fourth audio voltage signal into a fourth audio current signal via the left audio sending module, and send the fourth audio current signal to the upstream voice slave station via the left port; The fourth audio voltage signal is converted into a fourth audio current signal via the right audio sending module, the fourth audio current signal is sent to the right port, and the fourth audio current signal is sent to the downstream voice slave station via the right port.

5. The underground audio broadcasting device according to claim 2, characterized in that: Also includes: Analog channel switching module; In an initial state, the left port is connected to the left audio receiving module, and the right port is connected to the right audio receiving module; When a first audio current signal is received via the left port, the left audio receiving module is controlled by the analog channel switching module to communicate with the right audio sending module and the sound amplification circuit module respectively; In the case where the second audio current signal is received via the right port, the analog channel switching module controls the right audio receiving module to be connected to the left audio sending module and the sound amplification circuit module respectively.

6. The underground audio broadcasting device according to any one of claim 2, characterized in that: For the adjacent upstream voice slave stations and downstream voice slave stations, their interconnected left ports and right ports are connected through a voice receiving line and a voice transmitting line, so as to simultaneously realize sending of a first audio current signal to a left audio receiving module of the downstream voice slave station through the voice transmitting line by the right audio transmitting module of the upstream voice slave station, and receiving of a second audio current signal sent by the left audio transmitting module of the downstream voice slave station through the voice receiving line by the right audio receiving module of the upstream voice slave station.

7. The underground audio broadcasting device according to claim 6, characterized in that: The right audio transmission module of the upstream voice slave station includes: A current control circuit receives a first audio voltage signal sent by the left audio sending module of the upstream voice slave station, generates a first audio current signal according to the first audio voltage signal, and sends the first audio current signal to the left audio receiving module of the downstream voice slave station via a voice sending line; The left audio receiving module of the downstream voice slave station includes: A sampling circuit receives the first audio current signal for sampling to obtain a sampling voltage, and sends the sampling voltage to a voltage follower amplifier circuit; The voltage follower amplifier circuit performs amplification processing according to the sampled voltage to generate an amplified first audio voltage signal, and sends the amplified first audio voltage signal to the right audio sending module of the downstream voice slave station.

8. The underground audio broadcasting device according to any one of claim 2, characterized in that: For each adjacent upstream voice slave station and downstream voice slave station, the interconnected left port and right port are connected through the positive power line, the common ground line, and the voice transceiver line; so as to realize that the second audio current signal sent by the left audio sending module of the downstream voice slave station is received from the right audio receiving module of the upstream voice slave station via the voice transceiver line; or the first audio current signal is sent from the right audio sending module of the upstream voice slave station to the left audio receiving module of the downstream voice slave station via the voice transceiver line.

9. The underground audio broadcasting device according to claim 8, characterized in that: The right audio transmission module of the upstream voice slave station includes: A current control circuit receives a first audio voltage signal sent by the left audio sending module of the upstream voice slave station, generates a first audio current signal according to the first audio voltage signal, and sends the first audio current signal to the left audio receiving module of the downstream voice slave station via a voice sending line; The left audio receiving module of the downstream voice slave station includes: A sampling circuit receives the first audio current signal for sampling to obtain a sampling voltage, and sends the sampling voltage to a voltage comparator and a voltage follower amplifier circuit respectively; a voltage comparator, generating a control signal according to the sampled voltage to switch the mode of sending the first audio current signal from the upstream voice slave station to the downstream voice slave station or sending the second audio current signal from the downstream voice slave station to the upstream voice slave station; The voltage follower amplifier circuit performs amplification processing according to the sampled voltage to generate an amplified first audio voltage signal, and sends the amplified first audio voltage signal to the right audio sending module of the downstream voice slave station.

10. An underground audio broadcasting method, characterized in that: Used for the underground audio broadcasting device as described in any one of claims 1 to 9; The method comprises: When the current voice slave station receives a first audio current signal input from an upstream voice slave station via the left port, the first audio current signal is sent to the left audio receiving module; Converting the first audio current signal into a first audio voltage signal through the left audio receiving module, and sending the first audio voltage signal to the right audio sending module and the sound amplification circuit module respectively; Outputting the first audio voltage signal to a loudspeaker through the loudspeaker circuit module; The first audio voltage signal is converted into a first audio current signal by the right audio sending module, and the first audio current signal is sent to a downstream voice slave station.

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