Underground coal mine voice broadcasting system

Abstract

The invention relates to a coal mine underground voice broadcasting system, and belongs to the technical field of mining communication. The system carries out voice signal transmission based on a laid cable. In the broadcast voice input process, the voice sampler obtains voice signals, the voice signals are converted into digital signals through the digital-to-analog converter AD, the digital signals are compressed through the main processor, and compressed data packets are transmitted to other broadcast terminals through the power line carrier communication module and the power transmission cable. In the broadcast voice output process, the power line carrier communication module receives broadcast voice packets from the power transmission cable and transmits the broadcast voice packets to the main processor for decompression processing, the main processor transmits decompressed digital signals to the digital-to-analog converter DA, the digital signals are converted into voice signals through the digital-to-analog converter DA, and then the voice signals are played through the loudspeaker. According to the system, the power line carrier communication technology is adopted, power supply and high-speed data transmission are achieved based on the laid cables, and the installation and maintenance cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of mine communication, and relates to a voice broadcasting system in a coal mine, and in particular to a power carrier voice broadcasting system based on existing power cables in a coal mine. Background Art

[0002] The underground broadcasting communication system of coal mines is of great significance for the safety management and production scheduling of mines. In the event of emergencies such as fire, gas explosion, water seepage, etc., the broadcasting system can quickly send out alarms to all underground workers and guide them to quickly evacuate the dangerous area. Safety knowledge and emergency measures are conveyed through broadcasting to improve employees' safety awareness and prevent accidents. In the production scheduling plan, managers can issue production instructions through the broadcasting system, coordinate the work progress of various departments, and improve production efficiency. By broadcasting the status of the underground working surface in real time, such as information on key links such as transportation, ventilation, and drainage, it ensures that the coordination between various links is correct. Underground broadcasting can also be used for daily communication of underground workers. In the case of limited underground network coverage, the broadcasting system can be used as a supplementary communication tool to ensure that important information can be delivered to every employee in a timely manner. In addition, by playing music, news or other entertainment programs on the radio, the pressure of workers working for long hours is relieved and work efficiency is improved.

[0003] The broadcasting system is an important part of the six major communication systems in coal mines, and is an emergency system that must be installed by every coal mining enterprise. However, the traditional broadcasting system uses analog transmission, which has weak anti-interference ability and low intelligent management level. The new generation of broadcasting systems uses all-IP mode to transmit data through optical or network cables. Optical fiber has the characteristics of large bandwidth, low latency, and high reliability, but it is more troublesome to install and maintain. The transmission distance of the network cable is too short to meet the requirements of the working face arrangement. RS485 bus communication is easy to install and maintain, but it has low bandwidth and large latency, and cannot meet the requirements of voice broadcasting. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a voice broadcasting system in a coal mine, which adopts power line carrier communication technology to realize power supply and high-speed data transmission, meet the requirements of voice broadcasting, and solve the problem of inconvenient installation and maintenance of broadcasting terminals.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A voice broadcasting system for underground coal mines, which transmits voice signals based on the laid cables for power transmission, comprises at least: a plurality of broadcasting terminals connected to the power transmission cables, wherein the broadcasting terminals comprise a power carrier communication module, a main processor, a digital-to-analog converter AD, a digital-to-analog converter DA, a sound sampler and a speaker;

[0007] During the process of inputting broadcast voice, the sound sampler obtains the voice signal and converts the voice signal into a digital signal through the digital-to-analog converter AD. The main processor compresses the digital signal and then transmits the compressed data packet to other broadcast terminals through the power transmission cable through the power carrier communication module;

[0008] During the broadcast voice output process, the power carrier communication module receives the broadcast voice packet from the power transmission cable and transmits it to the main processor for decompression. The main processor transmits the decompressed digital signal to the digital-to-analog converter DA, which converts the digital signal into a voice signal and then plays it through the speaker.

[0009] Furthermore, a number of broadcast terminals use a preemptive method to perform broadcasting, and all authorized broadcast terminals can perform voice broadcasting.

[0010] Furthermore, several broadcast terminals operate in half-duplex mode, and authorized broadcast terminals switch to a listening state after completing broadcasting.

[0011] Furthermore, the main processor uses the Codec2 encoding algorithm to compress the PCM voice data converted by the digital-to-analog converter AD; the main processor uses the Codec2 decoding algorithm to decompress the data packet transmitted by the power carrier communication module.

[0012] Further, the main processor compresses the data into a data packet with a unified data format, wherein the data format of the data packet is sequentially set to: data start frame, source device address, destination device address, data length, data content, data verification code, and end character.

[0013] Furthermore, the SPI interface is used for data packet transmission between the main processor and the power carrier communication module.

[0014] Furthermore, all broadcast terminals are connected by bus communication.

[0015] The beneficial effects of the present invention are:

[0016] All broadcast terminals in the present invention adopt a fully intrinsically safe design and are suitable for underground coal mines.

[0017] The voice broadcasting system of the present invention adopts cable bus transmission, which is simple to deploy and convenient to install and maintain.

[0018] The voice broadcasting system of the present invention adopts power carrier technology, and power supply and voice data are transmitted simultaneously, thus saving cable costs and utilizing existing power supply lines.

[0019] The voice broadcasting system of the present invention adopts narrowband voice coding technology and is suitable for cable narrowband transmission.

[0020] The voice broadcasting system of the present invention adopts bus technology and has strong anti-interference performance, and all terminal devices can receive the voice broadcasting.

[0021] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0023] Figure 1 is a connection diagram of a broadcast terminal of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the broadcast terminal of the present invention;

[0025] Figure 3 A schematic diagram of the data compression and decompression process of the present invention;

[0026] Figure 4 It is a schematic diagram of the data format of the data packet of the present invention. DETAILED DESCRIPTION

[0027] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and the features in the embodiments can be combined with each other without conflict.

[0028] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0029] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] See also Figure 1 to Figure 4 , which is a voice broadcasting system in coal mines.

[0031] Example

[0032] A voice broadcasting system for underground coal mines, which transmits voice signals based on the cables laid out for power transmission, at least comprises: Figure 1 Several broadcast terminals connected to power transmission cables are shown, wherein Figure 2 As shown, the broadcast terminal includes a power carrier communication module, a main processor, a digital-to-analog converter AD, a digital-to-analog converter DA, a sound sampler and a speaker; in the process of inputting broadcast voice, the sound sampler obtains the voice signal, and converts the voice signal into a digital signal through the digital-to-analog converter AD, the main processor compresses the digital signal, and then transmits the compressed data packet to other broadcast terminals through the power transmission cable through the power carrier communication module; in the process of outputting broadcast voice, the power carrier communication module receives the broadcast voice packet from the power transmission cable, and transmits it to the main processor for decompression processing, the main processor transmits the decompressed digital signal to the digital-to-analog converter DA, the digital-to-analog converter DA converts the digital signal into a voice signal, and then plays it through the speaker.

[0033] The voice broadcasting system of the present invention adopts power line carrier communication technology and uses mining communication cables to transmit voice data while supplying power, mainly solving the problem of installing and using broadcasting terminals in working faces, return air lanes and other places.

[0034] The voice broadcasting system of the present invention adopts narrowband voice communication technology and compresses the standard PCM voice sampled by the sound sampler through the main processor to be suitable for power line carrier transmission.

[0035] The voice broadcasting system of the present invention adopts broadcasting communication technology. All broadcasting terminals on the power line can receive voice data through the power line carrier communication module and decode it through the digital-to-analog converter DA to restore the voice.

[0036] A high-speed SPI interface is used between the main processor and the power line carrier communication module in the broadcast terminal, which reduces development difficulty, reduces power consumption of the broadcast terminal, and supports bus communication and addressing access.

[0037] The multiple broadcasting terminals of the voice broadcasting system of the present invention do not distinguish between master and slave devices, all broadcasting terminals adopt a preemptive working mode, and all broadcasting terminals that have obtained the authority can perform voice broadcasting.

[0038] The multiple broadcasting terminals of the voice broadcasting system of the present invention work in half-duplex mode. After the authorized broadcasting terminal completes the broadcasting, it is in a monitoring state. Other devices can perform voice broadcasting after obtaining the authorization, so that all broadcasting terminals on a communication cable can perform voice broadcasting and intercom.

[0039] like Figure 3 As shown, the main processor uses the Codec2 algorithm to compress the PCM data so that the data transmission rate on the power transmission cable is less than 5000 bit / s to meet the power line carrier transmission requirements.

[0040] In addition, the main processor encapsulates the voice data into a fixed format for transmission on the bus. Figure 4 As shown, a complete data packet includes a data start frame, a source device address, a destination device address, a data length, a data content, a data check code, and a terminator.

[0041] All broadcast terminals in the present invention adopt a fully intrinsically safe design and are suitable for underground coal mines.

[0042] The voice broadcasting system of the present invention adopts cable bus transmission, is simple to deploy, and is convenient to install and maintain.

[0043] The voice broadcasting system of the present invention adopts power carrier technology, and power supply and voice data are transmitted simultaneously, thus saving cable costs and utilizing existing power supply lines.

[0044] The voice broadcasting system of the present invention adopts narrowband voice coding technology and is suitable for cable narrowband transmission.

[0045] The voice broadcasting system of the present invention adopts bus technology and has strong anti-interference performance, and all terminal devices can receive the voice broadcasting.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A coal mine underground voice broadcasting system, characterized in that: It transmits voice signals based on the cables that have been laid out for power transmission, and at least includes: a number of broadcast terminals connected to the power transmission cables, wherein the broadcast terminals include a power carrier communication module, a main processor, a digital-to-analog converter AD, a digital-to-analog converter DA, a sound sampler, and a speaker; During the process of inputting broadcast voice, the sound sampler obtains the voice signal and converts the voice signal into a digital signal through the digital-to-analog converter AD. The main processor compresses the digital signal and then transmits the compressed data packet to other broadcast terminals through the power transmission cable through the power carrier communication module; During the broadcast voice output process, the power carrier communication module receives the broadcast voice packet from the power transmission cable and transmits it to the main processor for decompression. The main processor transmits the decompressed digital signal to the digital-to-analog converter DA, which converts the digital signal into a voice signal and then plays it through the speaker.

2. A coal mine underground voice broadcasting system according to claim 1, characterized in that: Several broadcast terminals use a preemptive method to carry out broadcasting, and all authorized broadcast terminals can carry out voice broadcasting.

3. A coal mine underground voice broadcasting system according to claim 1, characterized in that: Several broadcast terminals operate in half-duplex mode, and authorized broadcast terminals switch to monitoring mode after completing broadcasting.

4. A coal mine underground voice broadcasting system according to claim 1, characterized in that: The main processor uses the Codec2 encoding algorithm to compress the PCM voice data converted by the digital-to-analog converter AD; the main processor uses the Codec2 decoding algorithm to decompress the data packet transmitted by the power carrier communication module.

5. A coal mine underground voice broadcasting system according to claim 1, characterized in that: The main processor compresses the data into a data packet with a unified data format, wherein the data format of the data packet is sequentially set to: data start frame, source device address, destination device address, data length, data content, data verification code, and end character.

6. A coal mine underground voice broadcasting system according to claim 1, characterized in that: The SPI interface is used for data packet transmission between the main processor and the power carrier communication module.

7. The coal mine underground voice broadcasting system according to claim 1, characterized in that: All broadcast terminals are connected by bus communication.

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