Special digital interphone with recording and broadcasting functions for railway

Abstract

The invention provides a special digital interphone with recording and broadcasting functions for a railway, which is characterized in that an emergency recording key is pressed down, a master control MCU controls an audio channel management module to communicate a microphone to a recording module and starts the recording module to record, a playback key is pressed down, the master control MCU controls the audio channel management module to communicate the recording module to an audio power amplifier, and the audio power amplifier is started to play the sound. The main control MCU is used for controlling the recording module to output recorded audio to the loudspeaker for playing through the audio power amplifier, and controlling the audio channel management module to communicate the recording module to the radio frequency transceiving and modulation-demodulation module by pressing the emergency broadcast key; and controlling the recording module to output the recorded audio to the radio frequency transceiving and modulation-demodulation module for modulation, and starting radio frequency periodic automatic emission, so as to realize emergency broadcast emission. According to the invention, the limitation that a traditional interphone depends on manual real-time broadcasting is solved, the dangerous case response speed is obviously improved, and the reliability of emergency communication is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of walkie - talkies, and more specifically, to a digital walkie - talkie with a dedicated railway recording and broadcasting function. Background Art

[0002] In railway construction operations, walkie - talkies are the core devices for operators to communicate and coordinate actions in real - time. Traditional railway walkie - talkies mainly rely on real - time manual voice transmission, with relatively single functions. However, in the event of an emergency (such as track failures, equipment anomalies, or sudden accidents), operators need to quickly transmit the emergency information. Due to the instantaneous nature of real - time calls, the information may not be fully conveyed due to environmental noise, operator nervousness, or insufficient equipment coverage. In addition, the emergency information needs to be repeated broadcast to alert all personnel within the coverage area. However, traditional walkie - talkies lack the functions of automatic recording and loop broadcasting, resulting in operators having to manually call multiple times, with low efficiency and potential delays in emergency response. In the prior art, although some walkie - talkies support the recording function, they lack an emergency broadcast mechanism for railway scenarios and cannot achieve automatic modulation and transmission of the recorded content and periodic broadcasting, making it difficult to meet the requirements of efficient and reliable emergency communication in railway construction. Summary of the Invention

[0003] In order to solve the above - mentioned deficiencies of the prior art, the purpose of the present invention is to provide a digital walkie - talkie with a dedicated railway recording and broadcasting function to overcome the defects in the prior art.

[0004] To achieve the above object, the present invention provides a digital interphone with a dedicated railway recording and broadcasting function, including an emergency recording button, a playback button, an emergency broadcast button, a main control MCU, an audio channel management module, a recording module, a microphone, an audio power amplifier, a speaker, and a radio frequency transceiver and modulation / demodulation module; wherein, the emergency recording button is electrically and signal-connected to the main control MCU, the main control MCU is electrically and signal-connected to the audio channel management module, and the audio channel management module is respectively electrically and signal-connected to the microphone and the recording module, so that by pressing the emergency recording button, the main control MCU controls the audio channel management module to connect the microphone to the recording module and start the recording module for recording; the playback button is electrically and signal-connected to the main control MCU, the audio channel management module is electrically and signal-connected to the audio power amplifier, and the audio power amplifier is electrically and signal-connected to the speaker, so that by pressing the playback button, the main control MCU controls the audio channel management module to connect the recording module to the audio power amplifier and control the recording module to output the recorded audio to the speaker through the audio power amplifier for playback; the emergency broadcast button is electrically and signal-connected to the main control MCU, and the audio channel management module is electrically and signal-connected to the radio frequency transceiver and modulation / demodulation module, so that by pressing the emergency broadcast button, the main control MCU controls the audio channel management module to connect the recording module to the radio frequency transceiver and modulation / demodulation module, and control the recording module to output the recorded audio to the radio frequency transceiver and modulation / demodulation module for modulation and start the radio frequency periodic automatic transmission to achieve emergency broadcast transmission.

[0005] Through the above technical solution, by triggering the emergency recording function with one key, the operator can quickly record the voice information of the dangerous situation and immediately broadcast it through the radio frequency transceiver and modulation / demodulation module when pressing the emergency broadcast button, solving the limitation of the traditional interphone relying on manual real-time broadcast and significantly improving the response speed of the dangerous situation. The recorded content can be automatically transmitted periodically through the radio frequency transceiver and modulation / demodulation module to ensure that all same-channel interphones within the coverage range continuously receive the dangerous situation information, avoiding information loss caused by single broadcast omission or signal interference and improving the reliability of emergency communication. The main control MCU and the audio channel management module work together to achieve rapid switching of the recording, playback, and broadcast functions, ensuring lossless transmission and priority control of audio signals in different modes, and optimizing the operation fluency of the device in emergency scenarios.

[0006] As a further description of the digital interphone with a dedicated railway recording and broadcasting function of the present invention, preferably, the main control MCU is electrically and signal-connected to the radio frequency transceiver and modulation / demodulation module. The main control MCU is used to immediately send an initialization instruction to the radio frequency transceiver and modulation / demodulation module when receiving the signal of pressing the emergency broadcast button, and at the same time start the built-in timer and set the transmission cycle parameter, so that the radio frequency transceiver and modulation / demodulation module loads the preset parameters required for transmission and automatically transmits the emergency broadcast according to the control of the main control MCU according to the set transmission cycle and preset parameters.

[0007] Through the above technical solution, after detecting the emergency broadcast key signal, the main control MCU immediately sends an initialization instruction to the RF module to ensure that the RF transceiver and modulation / demodulation module quickly loads preset parameters (such as frequency, power, modulation mode, etc.), significantly shortening the system startup delay and improving the response speed in emergency scenarios; by presetting the built-in timer and transmission cycle parameters, the main control MCU controls the RF transceiver and modulation / demodulation module to automatically repeat the broadcast signal at fixed intervals, avoiding omissions or delays that may be caused by manual repeated operations, ensuring continuous coverage of key information in the railway environment, especially enhancing communication reliability in signal interference or mobile scenarios, and realizing the efficiency, stability, and automation of emergency broadcasts.

[0008] As a further description of the digital intercom with railway-specific recording and broadcast functions of the present invention, preferably, the RF transceiver and modulation / demodulation module is configured to receive the RF signals of other intercoms on the same channel and perform demodulation processing. The main control MCU is used to control the RF transceiver and modulation / demodulation module to switch to the receiving mode during the idle time of the set transmission cycle, real-time monitor the RF received signal strength indication, and when a valid signal is detected, control the audio channel management module to establish a transmission path from the RF transceiver and modulation / demodulation module to the audio power amplifier to receive the emergency broadcast or normal intercom audio of other intercoms on the same channel; and when initiating a normal intercom during the idle time, control the audio channel management module to connect the microphone to the RF transceiver and modulation / demodulation module to transmit the normal intercom audio.

[0009] Through the above technical solution, by actively switching to the receiving mode during the idle period within the transmission cycle and monitoring the signal strength indication (RSSI), the device can timely respond to the emergency broadcast or normal communication requests of other devices on the same channel in the continuous broadcast state, breaking through the limitations of traditional broadcast devices with unidirectional transmission and improving the utilization rate of channel resources. Based on the real-time signal strength detection and valid signal recognition mechanism, the main control MCU preferentially establishes an emergency broadcast audio transmission path to ensure that the received high-priority signals (such as the emergency broadcasts of other devices) can be immediately played through the speaker, avoiding the coverage of emergency information by regular communications and strengthening the emergency response ability in the railway multi-terminal collaboration scenario. When initiating a normal intercom during the idle period, the main control MCU automatically routes the microphone audio to the RF module for transmission, realizing the dynamic interspersion of the emergency broadcast cycle and regular communication. This mechanism not only ensures the periodic coverage of emergency broadcasts but also meets the communication between dangerous situations, solving the pain point that traditional devices completely block normal communication in the emergency mode.

[0010] The main control MCU continuously detects the received signal strength indication (RSSI) of the radio frequency. It automatically triggers the audio channel switching only when a valid voice signal is recognized, avoiding interference from invalid noise and improving the accuracy and signal-to-noise ratio of voice reception. Through the linkage between the main control MCU and the audio channel management module, an automatic transmission path from the radio frequency received signal to the audio power amplifier is established, enabling the real-time playback of the voice content of other walkie-talkies without manual intervention, and significantly improving the response efficiency of multi-device collaborative operations.

[0011] As a further illustration of the digital walkie-talkie with railway-specific recording and broadcasting functions described in the present invention, preferably, the main control MCU is configured with a priority control module. The priority control module is used to automatically pause the ongoing recording operation or emergency broadcast transmission when the radio frequency transceiver and modulation / demodulation module receives the voice of other walkie-talkies on the same channel, and preferentially play the received voice content through the audio power amplifier and speaker.

[0012] Through the above technical solution, when the walkie-talkie is in the recording or emergency broadcast state, if the radio frequency transceiver and modulation / demodulation module receives the voice signal of other walkie-talkies on the same channel, the priority control module automatically pauses the current recording or broadcast task and preferentially plays the external voice content through the speaker. This not only prevents channel congestion but also ensures the efficient transmission of core warning information in railway operations, ensuring that operators can obtain external emergency instructions or danger reports in a timely manner and avoiding the omission of key information. By real-time judging the priority of the radio frequency received signal and the current operation state of the device, the main control MCU dynamically allocates audio channel resources, which not only guarantees the real-time broadcast of high-priority voices but also automatically resumes the original recording or broadcast process after the external voice playback is completed, significantly improving the system resource utilization efficiency and task continuity.

[0013] As a further illustration of the digital walkie-talkie with railway-specific recording and broadcasting functions described in the present invention, preferably, the audio channel management module includes a digital switching controller and a multi-channel analog audio switch array. The main control MCU is electrically and signal-connected to the digital switching controller, and the digital switching controller is electrically and signal-connected to the multi-channel analog audio switch array. The multi-channel analog audio switch array includes at least three independent channels and is respectively connected to the input end of the microphone and the recording module, the output end of the recording module and the audio power amplifier, and the output end of the recording module and the radio frequency transceiver and modulation / demodulation module, so that the digital switching controller receives the GPIO control signal of the main control MCU and controls the conduction and switching of the three independent channels.

[0014] Through the above technical solution, by designing at least three independent channels of the multi-channel analog audio switch array, the microphone input, audio power amplifier output, and RF modulation output paths are physically isolated, avoiding signal crosstalk and cross distortion, and ensuring the audio quality and fidelity in recording, playback, and broadcast scenarios. The digital switching controller directly drives the multi-channel analog audio switch array based on the GPIO control signal of the main control MCU, realizing millisecond-level switching response of the audio channel, significantly reducing the mode conversion delay, and meeting the real-time requirements of recording, broadcasting, and external voice reception in railway emergency scenarios. The coordinated work of the multi-channel analog audio switch array and the digital switching controller replaces the traditional discrete relays or complex logic circuits, reduces the system power consumption and hardware cost, and at the same time improves the overall integration of the device through modular packaging, adapting to the miniaturization and portability requirements of railway intercoms.

[0015] As a further illustration of the digital intercom with dedicated railway recording and broadcasting functions described in the present invention, preferably, the audio channel management module includes an audio buffer unit and a DMA controller. The recording module is electrically and signal-connected to the audio buffer unit through the DMA controller. The audio buffer unit is electrically and signal-connected to the main control MCU. The audio buffer unit is a three-buffer structure connected end to end. The DMA controller is used to control the continuous writing and storage of the audio recorded by the recording module into the audio buffer unit. The main control MCU is used to control the read and write operations of the audio buffer unit to achieve seamless connection of audio data in the loop playback mode.

[0016] Through the above technical solution, by adopting a three-buffer structure connected end to end and combining the continuous writing mechanism of the DMA controller, the circular storage and reading of recording data are realized. In the loop playback mode, the main control MCU dynamically schedules the read and write pointers of the buffer to ensure that there are no gaps or repetitions when switching audio data blocks, eliminating the playback jitter or data overwrite problems of the traditional single / double buffer structure, and ensuring the smoothness and integrity of emergency broadcast voices.

[0017] As a further illustration of the digital intercom with dedicated railway recording and broadcasting functions described in the present invention, preferably, it further includes a noise detection module. The noise detection module is electrically and signal-connected to the main control MCU. The main control MCU is electrically connected to the audio power amplifier. The noise detection module is used to send a high-level signal to the main control MCU when it detects that the ambient noise exceeds a preset threshold, so that the main control MCU automatically increases the output power of the audio power amplifier and performs volume compensation through the speaker.

[0018] Through the above technical solution, the noise detection module monitors the ambient noise intensity in real time. When the noise exceeds the preset threshold, the main control MCU automatically increases the output power of the audio power amplifier, and enhances the voice broadcast volume through the speaker, ensuring that the operating personnel can still clearly receive the danger broadcast or coordination instructions in the noisy construction environment, and enhancing the voice clarity and communication reliability of the railway intercom in the complex noise environment.

[0019] As a further illustration of the digital intercom with railway-specific recording and broadcast functions described in the present invention, preferably, it further includes a Beidou positioning module. The Beidou positioning module is electrically connected and signal-connected to the main control MCU. The Beidou positioning module is used to output NMEA protocol data, and the main control MCU is used to extract the UTC timestamp, longitude and latitude coordinates, and positioning status from the NMEA protocol data, so that the main control MCU controls the Beidou positioning module to output the current NMEA protocol data during the emergency recording or broadcast process and writes the extracted UTC timestamp, longitude and latitude coordinates, and positioning status data into the recorded audio of the recording module.

[0020] Through the above technical solution, during the emergency recording or broadcast process, the main control MCU extracts the UTC timestamp, longitude and latitude coordinates, and positioning status data of the Beidou positioning module in real time and embeds them in the recorded audio, realizing the automatic association of the voice content with the time and geographical location of the event occurrence, providing a key spatio-temporal evidence chain for subsequent danger tracing, liability determination, and emergency disposal, and avoiding the problems of low efficiency or information errors caused by manual location recording in the traditional method, significantly improving the integrity and credibility of the emergency data.

[0021] As a further illustration of the digital intercom with railway-specific recording and broadcast functions described in the present invention, preferably, it further includes a key linkage module. The key linkage module is electrically connected and signal-connected to the main control MCU, and the key linkage module is connected between the playback key and the emergency broadcast key. The key linkage module is used to send a trigger signal to the main control MCU when no valid signal of the emergency broadcast key is received within 60 seconds after the playback key is triggered, so that the main control MCU controls the recording module to automatically clear the current recorded audio and reset the path connection of the audio channel management module when receiving the trigger signal.

[0022] Through the above technical solution, the path connection of the audio channel management module is reset by triggering the key linkage module, forcibly restoring the default communication link, eliminating the problems of channel occupation or logical deadlock caused by abnormal operations or signal interference, and improving the system stability and fault tolerance.

[0023] The beneficial effects of the present invention are as follows: By triggering the emergency recording function with one key, the operator can quickly record voice information about dangerous situations and immediately broadcast it through the radio frequency transceiver and modulation and demodulation module when pressing the emergency broadcast button, solving the limitation of traditional walkie-talkies relying on manual real-time reporting and significantly improving the response speed to dangerous situations. The recorded content can be automatically cyclically transmitted through the radio frequency transceiver and modulation and demodulation module to ensure that all walkie-talkies on the same channel within the coverage area continuously receive the dangerous situation information, avoiding information loss caused by single broadcast omission or signal interference and improving the reliability of emergency communication. The main control MCU and the audio channel management module work together to achieve rapid switching of the recording, playback, and broadcast functions, ensuring lossless transmission and priority control of audio signals in different modes and optimizing the operation fluency of the device in emergency scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the core structural block diagram of the digital walkie-talkie with railway-specific recording and broadcast functions of the present invention;

[0025] Figure 2 is the structural block diagram of the audio channel management module of the present invention;

[0026] Figure 3 are other structural block diagrams of the digital walkie-talkie with railway-specific recording and broadcast functions of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to further understand the structure, features, and other purposes of the present invention, the following is a detailed description with reference to the attached preferred embodiments and accompanying drawings. The embodiments described by these drawings are only used to illustrate the technical solutions of the present invention and do not limit the present invention.

[0028] As the first embodiment of the present invention, as Figure 1 shown, the present invention provides a digital walkie-talkie with railway-specific recording and broadcast functions, including an emergency recording button 1, a playback button 2, an emergency broadcast button 3, a main control MCU 4, an audio channel management module 5, a recording module 6, a microphone 7, an audio power amplifier 8, a speaker 9, and a radio frequency transceiver and modulation and demodulation module 10.

[0029] The emergency recording button 1 is electrically and signal-connected to the main control MCU 4, the main control MCU 4 is electrically and signal-connected to the audio channel management module 5, and the audio channel management module 5 is respectively electrically and signal-connected to the microphone 7 and the recording module 6, so that by pressing the emergency recording button 1, the main control MCU 4 controls the audio channel management module 5 to connect the microphone 7 to the recording module 6 and start the recording module 6 for recording.

[0030] The playback button 2 is electrically and signal-connected to the main control MCU 4. The audio channel management module 5 is electrically and signal-connected to the audio power amplifier 8. The audio power amplifier 8 is electrically and signal-connected to the speaker 9. So that by pressing the playback button 2, the main control MCU 4 controls the audio channel management module 5 to connect the recording module 6 to the audio power amplifier 8, and controls the recording module 6 to output the recorded audio to the speaker 9 through the audio power amplifier 8 for playback.

[0031] The emergency broadcast button 3 is electrically and signal-connected to the main control MCU 4. The audio channel management module 5 is electrically and signal-connected to the radio frequency transceiver and modulation / demodulation module 10. So that by pressing the emergency broadcast button 3, the main control MCU 4 controls the audio channel management module 5 to connect the recording module 6 to the radio frequency transceiver and modulation / demodulation module 10, and controls the recording module 6 to output the recorded audio to the radio frequency transceiver and modulation / demodulation module 10 for modulation and start the radio frequency periodic automatic transmission to realize the emergency broadcast transmission. The emergency broadcast is recorded by the emergency operation personnel with a walkie-talkie having this function and the emergency voice content is started, and the emergency broadcast priority is set to the highest. The main control MCU 4 can be implemented by a Cortex-M4 chip such as AT32F435.

[0032] In this embodiment, by triggering the emergency recording function with one key, the operator can quickly record the voice information of the danger situation, and immediately broadcast it through the radio frequency transceiver and modulation / demodulation module when pressing the emergency broadcast button, which solves the limitation of the traditional walkie-talkie relying on manual real-time broadcast, and significantly improves the response speed of the danger situation. The recorded content can be periodically and automatically transmitted by the radio frequency transceiver and modulation / demodulation module to ensure that all the same-channel walkie-talkies within the coverage area continuously receive the danger situation information, avoid information loss caused by single broadcast omission or signal interference, and improve the reliability of emergency communication. The main control MCU and the audio channel management module work together to realize the quick switching of the recording, playback, and broadcast functions, ensure the lossless transmission and priority control of the audio signal in different modes, and optimize the operation fluency of the device in the emergency scenario.

[0033] As the second embodiment of the present invention, as Figure 1 shown, the main control MCU 4 is electrically and signal-connected to the radio frequency transceiver and modulation / demodulation module 10. The main control MCU 4 is used to immediately send an initialization instruction to the radio frequency transceiver and modulation / demodulation module 10 when receiving the signal of pressing the emergency broadcast button 3, and at the same time start the built-in timer and set the transmission cycle parameter, so that the radio frequency transceiver and modulation / demodulation module 10 loads the preset parameters required for transmission, and automatically transmits the emergency broadcast according to the control of the main control MCU 4 according to the set transmission cycle and preset parameters.

[0034] In this embodiment, after detecting the emergency broadcast key signal, the main control MCU immediately sends an initialization instruction to the RF module to ensure that the RF transceiver and modulation / demodulation module quickly loads preset parameters (such as frequency, power, modulation mode, etc.), significantly shortening the system startup delay and improving the response speed in emergency scenarios. By presetting the built-in timer and transmission cycle parameters, for example, the transmission cycle is preset to 60 seconds, and the emergency broadcast voice content is 20 seconds, that is, the broadcast transmission time is 20 seconds and the idle time is 40 seconds. The main control MCU controls the RF transceiver and modulation / demodulation module to automatically repeat transmitting the broadcast signal according to the above transmission cycle (within the 20-second broadcast transmission time of each transmission cycle), avoiding omissions or delays that may be caused by manual repeated operations, ensuring continuous coverage of key information in the railway environment, especially enhancing communication reliability in signal interference or mobile scenarios, and achieving the efficiency, stability, and automation of emergency broadcasts. To manually cancel the emergency broadcast, the hardware interrupt controller (AT32 EXTI module) is used to implement the real-time interrupt response function of the emergency broadcast key 3 and manual cancellation, ensuring that the transmission can be forcibly terminated at any time through the physical key during the emergency broadcast process, while meeting the requirements of the railway communication equipment for operation real-time and reliability.

[0035] As the third embodiment of the present invention, the RF transceiver and modulation / demodulation module 10 is configured to receive the RF signals of other walkie-talkies on the same channel and perform demodulation processing. The main control MCU 4 is used to control the RF transceiver and modulation / demodulation module 10 to switch to the receiving mode during the idle time of the set transmission cycle, real-time monitor the RF received signal strength indication, and when an effective signal is detected, control the audio channel management module 5 to establish a transmission path from the RF transceiver and modulation / demodulation module 10 to the audio power amplifier 8 to receive the emergency broadcast or normal intercom audio of other walkie-talkies on the same channel; and when initiating a normal intercom during the idle time, control the audio channel management module 5 to connect the microphone 7 to the RF transceiver and modulation / demodulation module 10 to transmit the normal intercom audio.

[0036] In this embodiment, during the idle period within the transmission cycle (such as within the set idle time of 40 seconds), it actively switches to the receiving mode and monitors the Received Signal Strength Indication (RSSI), enabling the device to promptly respond to the emergency broadcasts or normal communication requests of other devices on the same channel under the continuous broadcast state, breaking through the limitations of the one-way transmission of traditional broadcast devices and improving the utilization rate of channel resources. Based on the real-time signal strength detection and effective signal recognition mechanism, the main control MCU preferentially establishes an emergency broadcast audio transmission path to ensure that the received high-priority signals (such as the emergency broadcasts of other devices) can be immediately played through the speaker, avoiding the coverage of emergency information by regular communications and strengthening the emergency response ability in the multi-terminal collaborative scenario of railways. The walkie-talkie operates in a half-duplex mode. When initiating a normal intercom during the idle period (such as within the set idle time of 40 seconds), the main control MCU connects the microphone 7 to the radio frequency transceiver and modulation and demodulation module 10. This mechanism not only ensures the periodic coverage of emergency broadcasts but also satisfies the communication during emergencies, solving the pain point that traditional devices completely block normal communications in the emergency mode.

[0037] As the fourth embodiment of the present invention, as Figure 2 shown, the audio channel management module 5 includes a digital switching controller 51 and a multi-channel analog audio switch array 52. The main control MCU 4 is electrically connected and signal-connected to the digital switching controller 51, and the digital switching controller 51 is electrically connected and signal-connected to the multi-channel analog audio switch array 52. The multi-channel analog audio switch array 52 includes at least three independent channels and is respectively connected to the input ends of the microphone 7 and the recording module 6, the output end of the recording module 6 and the audio power amplifier 8, and the output end of the recording module 6 and the radio frequency transceiver and modulation and demodulation module 10, so that the digital switching controller 51 receives the GPIO control signal of the main control MCU 4 and controls the conduction and switching of the three independent channels. Through the design of at least three independent channels of the multi-channel analog audio switch array 52, the microphone input, audio power amplifier output, and radio frequency modulation output paths are physically isolated to avoid signal crosstalk and cross distortion, ensuring the audio quality and fidelity in the recording, playback, and broadcast scenarios.

[0038] In this embodiment, the digital switching controller 51 directly drives the multi-channel analog audio switch array 52 based on the GPIO control signal of the main control MCU 4 to achieve a millisecond-level switching response of the audio channel, significantly reducing the mode conversion delay and meeting the real-time requirements of recording, broadcasting, and external voice reception in the railway emergency scenario. The collaborative work of the multi-channel analog audio switch array 52 and the digital switching controller 51 replaces the traditional discrete relays or complex logic circuits, reduces the system power consumption and hardware costs, and at the same time improves the overall integration of the device through modular packaging, adapting to the requirements of miniaturization and portability of railway walkie-talkies.

[0039] As the fifth embodiment of the present invention, as Figure 2As shown in the figure, the audio channel management module 5 includes an audio buffer unit 53 and a DMA controller 54. The recording module 6 is electrically and signal-connected to the audio buffer unit 53 through the DMA controller 54. The audio buffer unit 53 is electrically and signal-connected to the main control MCU 4. The audio buffer unit 53 has a three-buffer structure connected end to end. The DMA controller 54 is used to control the continuous writing and storage of the audio recorded by the recording module 6 into the audio buffer unit 53. The main control MCU 4 is used to control the reading and writing operations of the audio buffer unit 53 to achieve seamless connection of audio data in the loop playback mode.

[0040] In this embodiment, a three-buffer structure connected end to end is adopted, combined with the continuous writing mechanism of the DMA controller 54, to realize the circular storage and reading of recording data. In the loop playback mode, the main control MCU 4 dynamically schedules the read and write pointers of the buffer to ensure that there is no gap or repetition when switching audio data blocks, eliminating the playback jitter or data overwrite problems of the traditional single / double buffer structure, and ensuring the fluency and integrity of the emergency broadcast voice.

[0041] As the sixth embodiment of the present invention, a noise detection module 11 is added compared with the first embodiment. As Figure 3 shown, the noise detection module 11 is electrically and signal-connected to the main control MCU 4. The main control MCU 4 is electrically and signal-connected to the audio power amplifier 8. The noise detection module 11 is used to send a high-level signal to the main control MCU 4 when it detects that the ambient noise exceeds a preset threshold, so that the main control MCU 4 automatically increases the output power of the audio power amplifier 8 and performs volume compensation through the speaker 9.

[0042] As the seventh embodiment of the present invention, a Beidou positioning module 12 is added compared with the first embodiment or the sixth embodiment. As Figure 3 shown, the Beidou positioning module 12 is electrically and signal-connected to the main control MCU 4. The Beidou positioning module 12 is used to output NMEA protocol data. The main control MCU 4 is used to extract the UTC timestamp, longitude and latitude coordinates, and positioning status from the NMEA protocol data. The main control MCU 4 controls the Beidou positioning module 12 to output the current NMEA protocol data during the emergency recording or broadcast process and writes the extracted UTC timestamp, longitude and latitude coordinates, and positioning status data into the recorded audio of the recording module 6.

[0043] In this embodiment, during the emergency recording or broadcast process, the main control MCU 4 extracts the UTC timestamp, longitude and latitude coordinates, and positioning status data of the Beidou positioning module 12 in real time and embeds them into the recorded audio, realizing the automatic association of the voice content with the time and geographical location of the event occurrence, providing a key spatio-temporal evidence chain for subsequent danger tracing, responsibility determination, and emergency disposal, avoiding the problems of low efficiency or information errors caused by manual location recording in the traditional method, and significantly improving the integrity and credibility of the emergency data.

[0044] As the eighth embodiment of the present invention, a key linkage module 13 is added compared with the first, sixth or seventh embodiment. As shown in Figure 3 , the key linkage module 13 is electrically connected and signal-connected to the main control MCU4, and the key linkage module 13 is connected between the playback key 2 and the emergency broadcast key 3. The key linkage module 13 is used to send a trigger signal to the main control MCU4 when no valid signal from the emergency broadcast key 3 is received within 60 seconds after the playback key 2 is triggered. When receiving this trigger signal, the main control MCU4 controls the recording module 6 to automatically clear the current recorded audio and reset the path connection of the audio channel management module 5. After the playback operation is completed, if the emergency broadcast is not triggered within 60 seconds, the main control MCU4 automatically clears the current recorded audio, releases the storage space and avoids residual data occupying resources, ensuring that the device is always in a standby state and providing sufficient recording capacity guarantee for subsequent emergency events. The key linkage module 13 detects the key state through a pull-up resistor or a pull-down resistor, and uses the internal timer of the main control MCU4 (such as the TIM module of AT32F435) to implement the 60-second timing function.

[0045] In this embodiment, the path connection of the audio channel management module 5 is reset by the key linkage module, forcibly restoring the default communication link, eliminating the problems of channel occupation or logical deadlock caused by abnormal operations or signal interference, and improving the system stability and fault tolerance.

[0046] The emergency broadcast working process of the above-mentioned digital intercom with railway-specific recording and broadcasting functions is as follows: The user using the intercom presses the dedicated emergency recording key 1, and the main control MCU4 controls the audio channel management module 5 to connect the audio of the microphone 7 to the recording module 6, and starts the recording module 6 for recording. After the recording is completed, the playback key 2 can be pressed, and the main control MCU4 controls the audio channel management module 5. The audio output from the recording module 6 is connected to the audio power amplifier 8, and the recording module 6 is controlled to play the recording, and the speaker 9 plays to check the recording content. After confirming that it is correct, the emergency broadcast key 3 is pressed, and the main control MCU4 controls the audio channel management module 5. The audio output from the recording module 6 is connected to the radio frequency transceiver and modulation and demodulation module 10 for voice modulation. The main control MCU4 starts radio frequency transmission and controls the recording module 6 to play the recorded content, and this voice content is modulated onto the carrier signal and transmitted. This intercom can also receive voice or danger voice sent by other users.

[0047] The emergency broadcast function of the digital interphone with dedicated railway recording and broadcast functions of the present invention can be applied to railway construction operations. In case of an emergency, by recording a voice message about the danger and then periodically transmitting the broadcast voice, other interphones on the same channel within the coverage area can receive the voice message about the danger, solving the limitation of traditional interphones relying on manual real-time broadcasting, significantly improving the danger response speed, and enhancing the reliability of emergency communication.

[0048] It should be noted that the above-mentioned invention content and specific implementation manners are intended to prove the practical application of the technical solutions provided by the present invention, and should not be construed as limiting the protection scope of the present invention. Those skilled in the art can make various modifications, equivalent replacements or improvements within the spirit and principle of the present invention. The protection scope of the present invention shall be subject to the appended claims.

Claims

1. A digital walkie-talkie with dedicated railway recording and broadcasting functions, characterized in that, Emergency recording button (1), playback button (2), emergency broadcast button (3), main control MCU (4), audio channel management module (5), recording module (6), microphone (7), audio power amplifier (8), speaker (9) and radio frequency transceiver and modulation and demodulation module (10); among them, The emergency recording button (1) is electrically connected and signal-connected to the main control MCU (4), the main control MCU (4) is electrically connected and signal-connected to the audio channel management module (5), and the audio channel management module (5) is electrically connected and signal-connected to the microphone (7) and the recording module (6) respectively, so that by pressing the emergency recording button (1), the main control MCU (4) controls the audio channel management module (5) to connect the microphone (7) to the recording module (6) and start the recording module (6) for recording; The playback button (2) is electrically connected and signal-connected to the main control MCU (4), the audio channel management module (5) is electrically connected and signal-connected to the audio power amplifier (8), and the audio power amplifier (8) is electrically connected and signal-connected to the speaker (9), so that by pressing the playback button (2), the main control MCU (4) controls the audio channel management module (5) to connect the recording module (6) to the audio power amplifier (8) and controls the recording module (6) to output the recorded audio to the speaker (9) for playback through the audio power amplifier (8); The emergency broadcast button (3) is electrically connected and signal-connected to the main control MCU (4), the audio channel management module (5) is electrically connected and signal-connected to the radio frequency transceiver and modulation and demodulation module (10), so that by pressing the emergency broadcast button (3), the main control MCU (4) controls the audio channel management module (5) to connect the recording module (6) to the radio frequency transceiver and modulation and demodulation module (10) and controls the recording module (6) to output the recorded audio to the radio frequency transceiver and modulation and demodulation module (10) for modulation and start periodic automatic transmission of the radio frequency to achieve emergency broadcast transmission.

2. The digital interphone with dedicated railway recording and broadcasting functions according to claim 1, characterized in that, The main control MCU (4) is electrically connected and signal-connected to the radio frequency transceiver and modulation and demodulation module (10). The main control MCU (4) is used to immediately send an initialization instruction to the radio frequency transceiver and modulation and demodulation module (10) when receiving the signal of pressing the emergency broadcast button (3), and at the same time start the built-in timer and set the transmission period parameter, so that the radio frequency transceiver and modulation and demodulation module (10) loads the preset parameters required for transmission and automatically transmits the emergency broadcast according to the control of the main control MCU (4) according to the set transmission period and preset parameters.

3. The digital walkie-talkie with railway-specific recording and broadcasting functions as claimed in claim 2, wherein, The radio frequency transceiver and modulation / demodulation module (10) is configured to receive radio frequency signals of other walkie-talkies on the same channel and perform demodulation processing. The main control MCU (4) is used to control the radio frequency transceiver and modulation / demodulation module (10) to switch to the receiving mode during the idle time of the set transmission cycle, monitor the radio frequency received signal strength indication in real time, and when a valid signal is detected, control the audio channel management module (5) to establish a transmission path from the radio frequency transceiver and modulation / demodulation module (10) to the audio power amplifier (8) to receive the emergency broadcast or normal intercom audio of other walkie-talkies on the same channel; and when initiating a normal intercom during the idle time, control the audio channel management module (5) to connect the microphone (7) to the radio frequency transceiver and modulation / demodulation module (10) to transmit normal intercom audio.

4. The digital walkie-talkie with railway-specific recording and broadcasting functions according to claim 1, characterized in that, The audio channel management module (5) includes a digital switching controller (51) and a multi-channel analog audio switch array (52). The main control MCU (4) is electrically connected and signal-connected to the digital switching controller (51). The digital switching controller (51) is electrically connected and signal-connected to the multi-channel analog audio switch array (52). The multi-channel analog audio switch array (52) includes at least three independent channels and is respectively connected to the input end of the microphone (7) and the recording module (6), the output end of the recording module (6) and the audio power amplifier (8), and the output end of the recording module (6) and the radio frequency transceiver and modulation / demodulation module (10), so that the digital switching controller (51) receives the GPIO control signal of the main control MCU (4) and controls the conduction switching of the three independent channels.

5. The digital walkie-talkie with dedicated railway recording and broadcasting functions according to claim 1, characterized in that The audio channel management module (5) includes an audio buffer unit (53) and a DMA controller (54). The recording module (6) is electrically connected and signal-connected to the audio buffer unit (53) through the DMA controller (54). The audio buffer unit (53) is electrically connected and signal-connected to the main control MCU (4). The audio buffer unit (53) is a three-buffer structure connected end to end. The DMA controller (54) is used to control the continuous writing and storage of the audio recorded by the recording module (6) into the audio buffer unit (53). The main control MCU (4) is used to control the read and write operations of the audio buffer unit (53) to achieve seamless connection of audio data in the loop playback mode.

6. The digital walkie-talkie with dedicated railway recording and broadcasting functions according to claim 1, characterized in that, It also includes a noise detection module (11). The noise detection module (11) is electrically connected and signal-connected to the main control MCU (4). The main control MCU (4) is electrically connected and signal-connected to the audio power amplifier (8). The noise detection module (11) is used to send a high-level signal to the main control MCU (4) when it detects that the ambient noise exceeds a preset threshold, so that the main control MCU (4) automatically increases the output power of the audio power amplifier (8) and performs volume compensation through the speaker (9).

7. The digital walkie-talkie with dedicated railway recording and broadcasting functions according to claim 1, characterized in that, It further includes a Beidou positioning module (12). The Beidou positioning module (12) is electrically connected and signal-connected to the main control MCU (4). The Beidou positioning module (12) is used to output NMEA protocol data. The main control MCU (4) is used to extract the UTC timestamp, longitude and latitude coordinates, and positioning status from the NMEA protocol data, so that the main control MCU (4) controls the Beidou positioning module (12) to output the current NMEA protocol data during emergency recording or broadcasting, and writes the extracted UTC timestamp, longitude and latitude coordinates, and positioning status data into the recorded audio of the recording module (6).

8. The digital walkie-talkie with dedicated railway recording and broadcasting functions according to claim 1, characterized in that, It further includes a key linkage module (13). The key linkage module (13) is electrically connected and signal-connected to the main control MCU (4), and the key linkage module (13) is connected between the playback key (2) and the emergency broadcast key (3). The key linkage module (13) is used to send a trigger signal to the main control MCU (4) when no valid signal of the emergency broadcast key (3) is received within 60 seconds after the playback key (2) is triggered, so that the main control MCU (4) controls the recording module (6) to automatically clear the current recorded audio and reset the path connection of the audio channel management module (5) when receiving the trigger signal.

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