CN114302347B - Coal mine broadcasting system with wireless talkback function and implementation method - Google Patents
Coal mine broadcasting system with wireless talkback function and implementation method Download PDFInfo
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Abstract
The invention relates to a coal mine broadcasting system with a wireless intercom function and an implementation method thereof, wherein the system comprises broadcasting node equipment and a handheld interphone, a power bus and a signal bus are respectively connected with a plurality of broadcasting node equipment, and the handheld interphone is communicated with the broadcasting node equipment through wireless signals; the implementation method comprises the following steps: the method comprises the steps of system wireless parameter configuration, handheld interphone wireless transmission, broadcast node equipment wireless receiving and baseband sending, broadcast node equipment baseband receiving and wireless transmission and handheld interphone wireless receiving. The wireless communication is added on the basis of the original all-wired system, so that the broadcasting can be initiated and received at any time and any place along the mine, and the timeliness and convenience of the system broadcasting call are improved.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a coal mine broadcasting system with a wireless talkback function and an implementation method thereof.
Background
The voice broadcasting system along the coal mine is a communication system for improving the mine safety management level and strengthening communication in the production process, and generally has the functions of task broadcasting, real-time broadcasting, scheduling management, emergency command and the like. The system generally consists of a power bus, a signal bus, broadcasting node equipment (including audio processing and amplifying circuits, a loudspeaker, a microphone and the like), and the like.
The length of a common mine is 2km to 4km, and the number of broadcasting nodes along the same line is usually 20-40. The distance between the broadcasting node devices is about 100m, and the broadcasting node devices in the current coal mine broadcasting system are provided with a loudspeaker and a microphone, wherein the loudspeaker can effectively cover the mine line through outputting with proper volume, but workers along the line must push a call key to initiate a call to the microphone to the nearest broadcasting node device if the workers along the line want to initiate the broadcast. The patent application 'digital transmission equipment of voice broadcast signals along coal mine and realization method' with patent number 202111397955.1 is characterized in that the technology is mature, the construction of line erection is relatively easy, the system cost is low, the anti-interference problem of the transmission of the broadcast signals along the coal mine is solved, the defect exists that the staff along the line can only initiate calling to the fixed position where the broadcast node equipment is erected, the broadcast calling can not be initiated anywhere at any time along the mine, and the timeliness and the convenience are poor. According to the general construction interval of the broadcast node equipment of 100m, workers can walk for 50m farthest in a mine tunnel to reach the broadcast node equipment and then send out a broadcast call, if the interval of the broadcast node equipment is increased, the walking distance is farther, and the response capability for the emergency broadcast call is poor.
Disclosure of Invention
The embodiment of the invention provides a coal mine broadcasting system with a wireless intercom function and an implementation method thereof, which are used for realizing the broadcasting initiation and receiving at any time and any place along a mine, particularly responding to the initiation of an emergency broadcast call in time and improving the emergency response performance of the system.
The invention adopts the following technical scheme for realizing the purpose: a coal mine broadcasting system with a wireless intercom function comprises broadcasting node equipment and a handheld interphone; the handheld interphone is characterized in that the plurality of broadcast node devices are respectively connected with a power bus and a signal bus, and the plurality of handheld interphone is communicated with the plurality of broadcast node devices through wireless signals;
the broadcast node equipment is used for wireless receiving and baseband sending, and baseband receiving and wireless transmitting, only one broadcast node equipment is in a wireless receiving and baseband sending state at the same time, and the other broadcast node equipment is in a baseband receiving and wireless transmitting state;
any one of the handheld interphone enters a wireless transmitting state and is in wireless communication with the plurality of nearby broadcast node devices through wireless signals, and the other handheld interphone is in a wireless receiving state and receives the wireless signals transmitted by the broadcast node devices in a baseband receiving and wireless transmitting state.
The circuit structure of the broadcast node equipment is that a digital signal processing circuit is respectively connected with a digital-to-analog conversion circuit, an analog-to-digital conversion circuit, an audio processing circuit I and a wireless transceiver circuit I in two directions, the wireless transceiver circuit I is respectively connected with the audio processing circuit I and an antenna I in two directions, the audio processing circuit I is respectively connected with a loudspeaker I and a microphone I in one direction, and the digital-to-analog conversion circuit and the analog-to-digital conversion circuit are respectively connected with a signal bus in one direction;
the antenna I is used for receiving wireless signals transmitted by the handheld interphone and transmitting the wireless signals to the wireless transceiving circuit I, the wireless transceiving circuit I demodulates audio signals and then transmits the audio signals to the audio processing circuit I and informs the digital signal processing circuit to enter a baseband transmitting state, the audio processing circuit I performs digital conversion on the audio signals and then transmits the audio signals to the digital signal processing circuit, and the digital signal processing circuit performs channel coding conversion on voice in the baseband transmitting state to generate transmitting modulation data and controls the digital-to-analog conversion circuit to generate digital baseband modulation signals;
the digital signal processing circuit is used for controlling the analog-to-digital conversion circuit to receive a digital baseband modulation signal in a baseband receiving state, decoding the received digital baseband modulation signal, outputting modulation audio to the wireless transceiver circuit I by controlling the audio processing circuit I, and controlling the wireless transceiver circuit I to wirelessly transmit through the antenna I;
the loudspeaker I and the microphone I are compatible with original broadcasting node equipment to initiate a broadcasting call and broadcast voice playing. The handheld interphone circuit structure is that a main control circuit is respectively connected with a wireless transceiver circuit II, an audio processing circuit II and a power circuit in a two-way mode, the wireless transceiver circuit II is respectively connected with the audio processing circuit II and an antenna II in a two-phase mode, the main control circuit is respectively connected with a wave channel knob, a calling key and a transceiver indicator lamp in a one-way mode, the audio processing circuit II is respectively connected with a loudspeaker II and a microphone II in a one-way mode, the power circuit is respectively connected with the audio processing circuit II, the wireless transceiver circuit II, a power switch and a battery in a one-way mode, and the battery is connected with the power switch in a one-way mode;
the main control circuit is used for calling key response, receiving and transmitting indicator light control, audio processing circuit II drive control, wireless receiving and transmitting circuit II drive control and power circuit control, the wireless receiving and transmitting circuit II is used for transmitting and receiving radio frequency wireless signals and transmitting modulation and receiving demodulation, the audio processing circuit II is used for picking up microphone II voice and modulating the microphone II voice to the wireless receiving and transmitting circuit II in a wireless transmitting state, the audio processing circuit II is used for receiving demodulated audio from the wireless receiving and transmitting circuit II and outputting the demodulated audio to a loudspeaker II in a wireless receiving state, the calling key is used for triggering the handheld interphone to enter a transmitting state, the receiving and transmitting indicator light realizes indication of receiving and transmitting two states through the control of the main control circuit, a wave channel knob is used for switching equipment working wave channels, the antenna II is used for receiving space radio frequency signals in a receiving state, and the antenna II is used for radiating the transmitting signals of the wireless receiving and transmitting circuit II to a space in a transmitting state, the power supply circuit carries out voltage stabilization conversion on the battery voltage and provides power supply output for the main control circuit, the audio processing circuit II and the wireless transceiver circuit II respectively, the power supply switch is used for controlling the power supply circuit to realize on-off control, and the battery realizes power supply to the handheld interphone.
A method for realizing a coal mine broadcasting system with a wireless talkback function comprises the following steps:
system radio parameter configuration
Setting wireless working frequency ranges of the broadcast node equipment and the handheld interphone, setting the transmitting frequencies of all the broadcast node equipment to be the same, carrying out transmitting coverage in a same-frequency simulcasting mode, setting the receiving frequencies of the handheld interphone to be the same as the transmitting frequencies of the broadcast node equipment, setting the receiving frequencies of all the broadcast node equipment to be the same as the transmitting frequencies of all the handheld interphone, setting the wireless transmitting powers of the broadcast node equipment and the handheld interphone and setting the wireless receiving thresholds of the broadcast node equipment and the handheld interphone;
wireless transmission of hand interphone
When the calling key is pressed down, the main control circuit controls the wireless transceiving circuit II to enter a transmitting state, controls the transceiving indicator lamp to be lightened to indicate the transmitting state, simultaneously controls the audio processing circuit II to pick up calling voice from the microphone II, amplifies and filters the calling voice through the audio processing circuit II and then transmits the calling voice to the wireless transceiving circuit II, and the audio signal is modulated to a transmitting radio frequency signal of the wireless transceiving circuit II and is radiated to a space through the antenna II;
broadcast node equipment wireless receiving and baseband transmitting
The broadcasting node equipment receives a wireless transmitting signal of the handheld interphone through the antenna I and transmits the wireless transmitting signal to the wireless transmitting and receiving circuit I, the wireless transmitting and receiving circuit I demodulates an audio signal, the audio signal is subjected to digital conversion through the audio processing circuit I and then transmitted to the digital signal processing circuit, the digital signal processing circuit performs channel coding conversion to generate transmitting modulation data and controls the digital-to-analog conversion circuit to generate a digital baseband modulation signal and transmit the digital baseband modulation signal to the signal bus, and the audio processing circuit I simultaneously outputs audio to the loudspeaker I to realize local voice playing;
baseband reception and wireless transmission of broadcast node equipment
The broadcasting node equipment receives a baseband modulation signal on a signal bus through an analog-to-digital conversion circuit, converts the baseband modulation signal into a digital signal and transmits the digital signal to a digital signal processing circuit, the digital signal processing circuit performs decoding processing, and outputs a modulation audio through a control audio processing circuit I to be modulated to a wireless receiving and transmitting circuit I, the wireless receiving and transmitting circuit I is controlled to perform wireless transmission, and a wireless transmission signal is radiated to a space through an antenna I;
the broadcasting node equipment picks up broadcasting voice through a microphone I, sends the broadcasting voice to an audio processing circuit I for amplification and filtering, and then carries out wireless transmission through an antenna I through a wireless transceiving circuit I;
wireless receiving of hand interphone
The handheld interphone receives a wireless transmitting signal of the broadcasting node equipment through the antenna II, transmits the wireless signal to the wireless transceiver circuit II, demodulates the audio signal and informs the master control circuit to start receiving the wireless signal, the master control circuit controls the transceiver indicator lamp to light and indicate the receiving of the wireless signal, the wireless transceiver circuit II sends the audio signal to the audio processing circuit II, and the audio processing circuit II amplifies and filters the audio signal and then sends the audio signal to the loudspeaker II to realize voice playing.
In the system wireless parameter configuration, the wireless working frequency range of the broadcast node equipment and the handheld interphone is 400 MHz-470 MHz, the minimum interval of channels is 12.5kHz, the broadcast node equipment adopts a working mode of transmitting and receiving different frequencies, the difference of the transmitting and receiving frequencies is more than or equal to 10MHz, the wireless transmitting power of the broadcast node equipment and the handheld interphone is set to be 0.1 w-1 w, the wireless receiving threshold of the broadcast node equipment and the handheld interphone is set to be 0.5 uV-5 uV, and the actual set values of the wireless transmitting power and the wireless receiving threshold are determined according to the specific shielding condition of wireless signals inside the mine line.
During handheld intercom wireless transmission, handheld intercom carries out wireless environment earlier and listens, then does not launch when detecting the channel and occupy the back to send the prompt tone through speaker II, thereby avoid the transmission collision between the handheld intercom, only one handheld intercom is in the transmitting state in the same time system, and other handheld intercom all are in wireless receiving state.
In the wireless receiving and baseband sending of the broadcast node equipment, when the handheld interphone is ensured to transmit through the wireless transmitting power of the handheld interphone and the wireless receiving threshold of the broadcast node equipment, only the broadcast node equipment within 3 nearest to the handheld interphone receives wireless signals transmitted by the handheld interphone, in order to avoid the collision of different broadcast node equipment modulating baseband signal transmission, a method of differential delay and signal bus interception is adopted, the broadcast node equipment receiving the wireless signals determines the time of delay transmission according to the strength of the received wireless signals, the stronger the wireless signal strength, the shorter the delay, 1-10 ms of delay is randomly added on the basis to avoid the signal collision when adjacent broadcast node equipment receives the same wireless signal strength, the signal bus interception operation is carried out before the transmission, and the baseband receiving state is switched after the occupation of the signal bus is detected, only one node device in the system is in a baseband sending state at the same time, and other broadcasting node devices are in a baseband receiving state.
The invention has the beneficial effects that: the wireless communication is added on the basis of the original all-wired system, so that the broadcasting call and the broadcasting signal receiving are realized at any time and any place along the mine, and the timeliness and the convenience of the system are greatly improved. The system meets the requirement that the staff timely initiates the broadcast call, and has emergency response capability.
Drawings
FIG. 1 is a system connection block diagram of the present invention;
FIG. 2 is a block circuit diagram of a broadcast node apparatus of the present invention;
FIG. 3 is a block diagram of the handheld interphone of the invention;
FIG. 4 is a software control flow diagram of a broadcast node apparatus of the present invention;
FIG. 5 is a flowchart illustrating software control of the handheld interphone according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention.
Fig. 1 shows a system link schematic diagram of a coal mine voice broadcasting system along a coal mine, and the coal mine broadcasting system with a wireless intercom function comprises a power bus, a signal bus, a plurality of broadcasting node devices and a plurality of handheld interphones. The number of the broadcasting node devices is determined by the length of the coal mine along the line, the length of the coal mine is 4km, and the number N of the broadcasting nodes is 40. The number of the handheld interphones in the system is not limited, and according to the general application condition, the number K of the handheld interphones is 3;
the power interfaces of all the broadcasting node devices are connected to the power bus in parallel, and the signal interfaces of all the broadcasting node devices are connected to the signal bus in parallel. All the handheld interphones and all the broadcasting node equipment realize wireless communication through antennas;
the power bus supplies power to the scheduling device and each broadcast node device, and considering the loss of the power bus to the transmitted power voltage, the power voltage is generally not lower than 18V, and the power voltage in this embodiment is 18V.
In order to take account of cost and power supply voltage transmission loss, a power supply bus adopts 2 copper core transmission cables with the sectional area of 1.5mm, and a signal bus adopts 2 copper core transmission cables with the sectional area of 1mm (the sectional area of the bus cable can be properly increased or decreased according to the length of a mine edge line and the number of broadcasting nodes in specific implementation).
Fig. 2 shows a circuit block diagram of a broadcasting node device, the broadcasting node device comprises an antenna I, a wireless transceiving circuit I, an audio processing circuit I, a digital signal processing circuit, a digital-to-analog conversion circuit, an analog-to-digital conversion circuit, a loudspeaker I and a microphone I;
the circuit structure of the broadcast node equipment is that an antenna I is used for receiving or transmitting wireless signals, the antenna I can adopt various forms according to specific requirements, and the external whip antenna is adopted in the embodiment and transmits the wireless signals received from the space to an antenna interface of a wireless transceiver circuit I or radiates the wireless signals sent by the wireless transceiver circuit I to the space;
the wireless transceiver circuit I is used for receiving and demodulating wireless signals in a wireless receiving state and outputting audio signals or modulating audio in a wireless transmitting state and then wirelessly transmitting, and a single-chip transceiver RDA1846 is adopted in the embodiment;
the audio processing circuit I is configured to process a voice signal picked up by the microphone I and convert a digital voice signal from the digital signal processing circuit I into an analog voice signal, and output the analog voice signal to the speaker I for playing.
The digital signal processing circuit is respectively connected with the digital-to-analog conversion circuit, the analog-to-digital conversion circuit, the audio processing circuit I and the wireless transceiving circuit I in a bidirectional way;
the core circuit of the digital signal processing circuit I in the embodiment of the invention is composed of an ultra-low power consumption MCU chip STM32L and a low power consumption DSP chip TMS320VC5509, and the peripheral circuit of the digital signal processing circuit I is not limited in the embodiment of the invention.
In the embodiment of the present invention, the core circuit of the digital-to-analog conversion circuit I is implemented by using the DAC chip TLV5616, the core circuit of the analog-to-digital conversion circuit I is implemented by using the ADC chip ADC121S021, and the embodiment of the present invention of the peripheral circuit is not limited.
The speaker I may be an active speaker device or a speaker with an audio power amplifier circuit, and the embodiment of the present invention is not limited.
The microphone I is used for picking up scheduling voice of the scheduling equipment end, the microphone I can adopt various implementation forms, and the embodiment of the invention adopts an electret microphone which converts voice signals into voltage signals and transmits the voltage signals to a microphone interface of the audio processing circuit I.
Fig. 3 shows a circuit block diagram of the handheld interphone, which includes an antenna II, a wireless transceiver circuit II, an audio processing circuit II, a main control circuit, a battery, a power switch, a channel knob, a power circuit, a call button, a transceiver indicator, a speaker II, and a microphone II.
The implementation schemes of the antenna II, the wireless transceiver circuit II, the audio processing circuit II, the microphone II in the handheld interphone and the antenna I, the wireless transceiver circuit I, the audio processing circuit I and the microphone I in the broadcasting node device are the same.
The main control circuit is respectively in one-way connection with the channel knob, the call key and the receiving and sending indicator lamp and is used for responding to call initiation, channel switching, controlling the receiving and sending indicator lamp to be green and the like to indicate that a wireless signal is received so as to realize man-machine interaction. The master control circuit is respectively connected with the wireless transceiver circuit II and the audio circuit in two directions to realize the drive and control of the wireless transceiver circuit II and the audio circuit and the state acquisition. In the embodiment of the invention, the main control circuit adopts an ultra-low power consumption MCU chip STM 32L.
In the embodiment, the battery is a lithium ion battery pack, the power switch adopts RP08110SNJX-V02-0780, the power circuit adopts a DC/DC chip LTC3607 and an LDO chip SPX3819, the wave channel knob adopts RE08120JX-V02-0510, the loudspeaker II adopts ND03662M.169P-C, the receiving and transmitting indicator lamp adopts a double-color light-emitting diode 19-123/R6GHC-D01/2T, and the call key adopts a tact switch.
Fig. 4 shows a software control flow chart of the broadcast node device, the broadcast node device starts to work after being powered on, the digital signal processing circuit respectively performs initialization drive control on the digital-to-analog conversion circuit, the analog-to-digital conversion circuit, the audio processing circuit I and the wireless transceiver circuit I, and then sequentially judges whether a wireless signal is received, whether a mike I call is enabled, and whether a baseband receiving signal exists.
And when the wireless signal is received, performing receiving demodulation, controlling an audio processing circuit to perform audio digital conversion, then performing transmission modulation signal coding, controlling a digital-to-analog conversion circuit, controlling the digital-to-analog conversion circuit to generate a baseband modulation signal and outputting the baseband modulation signal to a signal bus, returning when the transmission is finished, and otherwise, repeating the transmission process.
When the response microphone I call is enabled, firstly, the audio processing circuit I is controlled to collect the microphone I audio signal, then, the transmission modulation signal coding, the digital-to-analog conversion circuit control and the digital-to-analog conversion circuit are carried out to generate a baseband modulation signal and output the baseband modulation signal to the signal bus, and if the transmission is finished, the return is carried out, otherwise, the transmission process is repeated.
After receiving the baseband receiving signal, the receiving signal is decoded, processed by signaling and processed by data, then the audio processing circuit I is controlled to realize audio digital-to-analog conversion, and the audio output loudspeaker I realizes voice broadcast output, if the receiving is finished, the process is returned, otherwise, the receiving process is repeated.
Fig. 5 shows a software control flow chart of the handheld interphone, the handheld interphone starts to work after being powered on, the main control circuit respectively performs initialization drive control on the wireless transceiver circuit II and the audio processing circuit II, and then sequentially judges whether to call enable or receive a wireless signal.
After the response call is enabled, firstly, the main control circuit controls the transmitting state of the wireless transmitting and receiving circuit II, controls the red light of the transmitting and receiving indicating lamp to be lightened, controls the audio processing circuit II, acquires an audio signal through a microphone II signal, performs audio modulation and wireless transmission, stops transmitting, extinguishes the red light and returns after the wireless transmission is completed, and otherwise, continues the wireless transmission process.
After receiving the wireless signal, firstly controlling the wireless transceiver circuit II to receive and demodulate, and then controlling the audio processing circuit II to output the audio, namely amplifying and filtering the demodulated audio and outputting the audio to the loudspeaker II to play and output, controlling the transceiver indicator lamp to light up, turning off the green lamp and returning after the wireless signal reception is finished, otherwise, continuously receiving the flow.
With reference to the embodiment of the system technical solution, the specific scenario application embodiment of the present invention is as follows:
the receiving frequency of 40 broadcasting node devices is set to 401.0125MHz, the transmitting frequency is set to 411.0125MHz, the transmitting frequency of 3 handheld interphones is set to 401.0125MHz, the receiving frequency is set to 411.0125MHz, the wireless transmitting power of the broadcasting node devices and the handheld interphones is set to 0.5w, and the wireless receiving threshold of the broadcasting node devices and the handheld interphones is set to 1 uV.
Patrolling personnel along the mine carry the handheld interphone 1 to patrol the running condition of the coal mining and conveying equipment in the mine, the equipment maintenance group carries the handheld interphone 2 to watch for at the beginning of the mine, and the coal mining group carries the handheld interphone 3 to work at the end of the mine.
When an inspector walks to the middle position along the mine, the inspector discovers that the coal conveying equipment is abnormal, a calling key of the handheld interphone 1 is immediately pressed, a wireless broadcast call is initiated to inform the abnormal condition of the equipment, the handheld interphone 1 transmits a wireless signal TXM of 401.0125MHz, 3 broadcasting node equipment which is positioned at the middle position along the mine and close to the handheld interphone 1 receives the wireless signal TXM and starts a receiving threshold, the 3 broadcasting node equipment realizes wireless signal receiving and baseband transmission through a baseband signal transmitting and collision avoiding mechanism, except the broadcasting node equipment which is finally positioned in the wireless receiving and baseband transmitting states, the other broadcasting node equipment enters the baseband receiving and wireless transmitting states, and a wireless transmitting signal TXB with the wireless transmitting frequency of 411.0125MHz is adopted, so that the whole mine is covered by wireless signals of 411.0125MHz along the same frequency in a simulcasting mode, and the handheld interphone 2 of the equipment maintenance group and the handheld coal interphone 3 of the mining group receive the wireless signal TXB of the broadcasting node equipment Then demodulation is carried out, voice playing is carried out through a loudspeaker II of the handheld interphone 2 and the handheld interphone 3, personnel in an equipment maintenance group can arrive at a corresponding place to carry out equipment maintenance after hearing the abnormal condition broadcast, and a coal mining group stops mining operation and further communicates through a wide system after hearing the abnormal condition broadcast.
Claims (7)
1. The utility model provides a take colliery mine broadcasting system of wireless function of talkbacking which characterized in that: the system comprises broadcast node equipment and a handheld interphone; the handheld interphone is characterized in that the plurality of broadcast node devices are respectively connected with a power bus and a signal bus, and the plurality of handheld interphone is communicated with the plurality of broadcast node devices through wireless signals;
the broadcast node equipment is used for wireless receiving and baseband sending, and baseband receiving and wireless transmitting, only one broadcast node equipment is in a wireless receiving and baseband sending state at the same time, and the other broadcast node equipment is in a baseband receiving and wireless transmitting state;
in order to avoid the collision of different broadcast node devices in modulating baseband signal transmission, the broadcast node device receiving the wireless signal determines the time for delaying transmission according to the intensity of the received wireless signal, the stronger the intensity of the wireless signal is, the shorter the delay is, and on the basis, the delay of 1-10 ms is randomly increased, so that the signal collision generated when the adjacent broadcast node devices receive the same wireless signal intensity is avoided;
any one of the handheld interphone enters a wireless transmitting state and is in wireless communication with the plurality of nearby broadcast node devices through wireless signals, and the other handheld interphone is in a wireless receiving state and receives the wireless signals transmitted by the broadcast node devices in a baseband receiving and wireless transmitting state.
2. The coal mine broadcasting system with the wireless intercom function according to claim 1, characterized in that:
the circuit structure of the broadcast node equipment is that a digital signal processing circuit is respectively connected with a digital-to-analog conversion circuit, an analog-to-digital conversion circuit, an audio processing circuit I and a wireless transceiver circuit I in two directions, the wireless transceiver circuit I is respectively connected with the audio processing circuit I and an antenna I in two directions, the audio processing circuit I is respectively connected with a loudspeaker I and a microphone I in one direction, and the digital-to-analog conversion circuit and the analog-to-digital conversion circuit are respectively connected with a signal bus in one direction;
the antenna I is used for receiving wireless signals transmitted by the handheld interphone and transmitting the wireless signals to the wireless transceiving circuit I, the wireless transceiving circuit I demodulates audio signals and then transmits the audio signals to the audio processing circuit I and informs the digital signal processing circuit to enter a baseband transmitting state, the audio processing circuit I performs digital conversion on the audio signals and then transmits the audio signals to the digital signal processing circuit, and the digital signal processing circuit performs channel coding conversion on voice in the baseband transmitting state to generate transmitting modulation data and controls the digital-to-analog conversion circuit to generate digital baseband modulation signals;
the digital signal processing circuit is used for controlling the analog-to-digital conversion circuit to receive a digital baseband modulation signal in a baseband receiving state, decoding the received digital baseband modulation signal, outputting modulation audio to the wireless transceiver circuit I by controlling the audio processing circuit I, and controlling the wireless transceiver circuit I to wirelessly transmit through the antenna I;
the loudspeaker I and the microphone I are compatible with original broadcasting node equipment to initiate a broadcasting call and broadcast voice playing.
3. The coal mine broadcasting system with the wireless intercom function according to claim 1, characterized in that:
the handheld interphone circuit structure is that a main control circuit is respectively connected with a wireless transceiver circuit II, an audio processing circuit II and a power circuit in a two-way mode, the wireless transceiver circuit II is respectively connected with the audio processing circuit II and an antenna II in a two-phase mode, the main control circuit is respectively connected with a wave channel knob, a calling key and a transceiver indicator lamp in a one-way mode, the audio processing circuit II is respectively connected with a loudspeaker II and a microphone II in a one-way mode, the power circuit is respectively connected with the audio processing circuit II, the wireless transceiver circuit II, a power switch and a battery in a one-way mode, and the battery is connected with the power switch in a one-way mode;
the main control circuit is used for calling key response, receiving and transmitting indicator light control, audio processing circuit II drive control, wireless receiving and transmitting circuit II drive control and power circuit control, the wireless receiving and transmitting circuit II is used for transmitting and receiving radio frequency wireless signals and transmitting modulation and receiving demodulation, the audio processing circuit II is used for picking up microphone II voice and modulating the microphone II voice to the wireless receiving and transmitting circuit II in a wireless transmitting state, the audio processing circuit II is used for receiving demodulated audio from the wireless receiving and transmitting circuit II and outputting the demodulated audio to a loudspeaker II in a wireless receiving state, the calling key is used for triggering the handheld interphone to enter a transmitting state, the receiving and transmitting indicator light realizes indication of receiving and transmitting two states through the control of the main control circuit, a wave channel knob is used for switching equipment working wave channels, the antenna II is used for receiving space radio frequency signals in a receiving state, and the antenna II is used for radiating the transmitting signals of the wireless receiving and transmitting circuit II to a space in a transmitting state, the power supply circuit carries out voltage stabilization conversion on the battery voltage and provides power supply output for the main control circuit, the audio processing circuit II and the wireless transceiver circuit II respectively, the power supply switch is used for controlling the power supply circuit to realize on-off control, and the battery realizes power supply to the handheld interphone.
4. A method for realizing the coal mine broadcasting system with the wireless talkback function in the claim 1 is characterized by comprising the following steps:
system radio parameter configuration
Setting wireless working frequency ranges of the broadcast node equipment and the handheld interphone, setting the transmitting frequencies of all the broadcast node equipment to be the same, carrying out transmitting coverage in a same-frequency simulcasting mode, setting the receiving frequencies of the handheld interphone to be the same as the transmitting frequencies of the broadcast node equipment, setting the receiving frequencies of all the broadcast node equipment to be the same as the transmitting frequencies of all the handheld interphone, setting the wireless transmitting powers of the broadcast node equipment and the handheld interphone and setting the wireless receiving thresholds of the broadcast node equipment and the handheld interphone;
wireless transmission of hand interphone
When the calling key is pressed down, the main control circuit controls the wireless transceiving circuit II to enter a transmitting state, controls the transceiving indicator lamp to be lightened to indicate the transmitting state, simultaneously controls the audio processing circuit II to pick up calling voice from the microphone II, amplifies and filters the calling voice through the audio processing circuit II and then transmits the calling voice to the wireless transceiving circuit II, and the audio signal is modulated to a transmitting radio frequency signal of the wireless transceiving circuit II and is radiated to a space through the antenna II;
broadcast node equipment wireless receiving and baseband transmitting
The broadcasting node equipment receives a wireless transmitting signal of the handheld interphone through an antenna I, transmits the wireless transmitting signal to a wireless transmitting and receiving circuit I, demodulates an audio signal through the wireless transmitting and receiving circuit I, performs digital conversion on the audio signal through an audio processing circuit I and then transmits the audio signal to a digital signal processing circuit, the digital signal processing circuit performs channel coding conversion to generate transmitting modulation data and controls a digital-to-analog conversion circuit to generate a digital baseband modulation signal and transmit the digital baseband modulation signal to a signal bus, and the audio processing circuit I simultaneously outputs audio to a loudspeaker I to realize local voice playing;
in order to avoid the collision of different broadcast node devices in modulating baseband signal transmission, the broadcast node device receiving the wireless signal determines the time for delaying transmission according to the intensity of the received wireless signal, the stronger the intensity of the wireless signal is, the shorter the delay is, and on the basis, the delay of 1-10 ms is randomly increased so as to avoid the signal collision when the adjacent broadcast node devices receive the same intensity of the wireless signal;
baseband reception and wireless transmission of broadcast node equipment
The broadcasting node equipment receives a baseband modulation signal on a signal bus through an analog-to-digital conversion circuit, converts the baseband modulation signal into a digital signal and transmits the digital signal to a digital signal processing circuit, the digital signal processing circuit performs decoding processing, and outputs a modulation audio through a control audio processing circuit I to be modulated to a wireless receiving and transmitting circuit I, the wireless receiving and transmitting circuit I is controlled to perform wireless transmission, and a wireless transmission signal is radiated to a space through an antenna I;
the broadcasting node equipment picks up broadcasting voice through a microphone I, sends the broadcasting voice to an audio processing circuit I for amplification and filtering, and then carries out wireless transmission through an antenna I through a wireless transceiving circuit I;
wireless receiving of hand interphone
The handheld interphone receives a wireless transmitting signal of the broadcasting node equipment through the antenna II, transmits the wireless signal to the wireless transceiver circuit II, demodulates the audio signal and informs the master control circuit to start receiving the wireless signal, the master control circuit controls the transceiver indicator lamp to light and indicate the receiving of the wireless signal, the wireless transceiver circuit II sends the audio signal to the audio processing circuit II, and the audio processing circuit II amplifies and filters the audio signal and then sends the audio signal to the loudspeaker II to realize voice playing.
5. The method for realizing the coal mine broadcasting system with the wireless intercom function according to claim 4, is characterized in that: in the system wireless parameter configuration, the wireless working frequency range of the broadcast node equipment and the handheld interphone is 400 MHz-470 MHz, the minimum interval of channels is 12.5kHz, the broadcast node equipment adopts a working mode of transmitting and receiving different frequencies, the difference of the transmitting and receiving frequencies is more than or equal to 10MHz, the wireless transmitting power of the broadcast node equipment and the handheld interphone is set to be 0.1 w-1 w, the wireless receiving threshold of the broadcast node equipment and the handheld interphone is set to be 0.5 uV-5 uV, and the actual set values of the wireless transmitting power and the wireless receiving threshold are determined according to the shielding condition of specific wireless signals inside the mine line.
6. The method for implementing the coal mine broadcasting system with the wireless intercom function according to claim 4, is characterized in that: during handheld intercom wireless transmission, handheld intercom carries out wireless environment earlier and listens, then does not launch when detecting the channel and occupy the back to send the prompt tone through speaker II, thereby avoid the transmission collision between the handheld intercom, only one handheld intercom is in the transmitting state in the same time system, and other handheld intercom all are in wireless receiving state.
7. The method for implementing the coal mine broadcasting system with the wireless intercom function according to claim 4, is characterized in that: during the wireless receiving and baseband sending of the broadcast node equipment, when the handheld interphone is ensured to transmit through the wireless transmitting power of the handheld interphone and the wireless receiving threshold of the broadcast node equipment, only the broadcast node equipment within 3 nearest to the handheld interphone receives wireless signals transmitted by the handheld interphone, signal bus monitoring operation is carried out before transmission, the broadcast node equipment is switched to a baseband receiving state after the signal bus is detected to be occupied, only one node equipment in the same time system is in a baseband transmitting state, and other broadcast node equipment are in a baseband receiving state.
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