Vehicle-mounted voice communication method

Abstract

The invention discloses a vehicle-mounted voice communication method, which comprises the following steps of: a) arranging a wired talkback host and a microphone on at least two vehicles, arranging loudspeakers inside and outside the vehicles, and connecting the microphone and the loudspeakers with the wired talkback host; b) arranging a wireless host on at least one vehicle, connecting the wireless host with an antenna, and interconnecting the wireless host with wired talkback hosts on the vehicle and other vehicles through a first communication bus; and c) realizing data communication inside the vehicle, on / off the vehicle, vehicle marshalling and vehicle formation through the wired talkback host and the wireless host. The technical problems that equipment inside the vehicle and equipment outside the vehicle are not linked, the communication quality in the tunnel is poor, and the field operation and safety requirements cannot be met in the existing voice communication system can be solved.

Description

Technical Field

[0001] This application relates to the field of railway engineering electrical technology, and in particular to an onboard voice communication method for use with large railway maintenance machinery. Background Technology

[0002] After more than 20 years of development, large-scale track maintenance machinery has reached a considerable scale in China, and its maintenance level has also made significant progress. However, railway operation site management processes are strict and personnel are complex. Currently, the onboard voice communication methods for large-scale track maintenance machinery use wireless train dispatching for communication between platforms, wired communication between vehicles, and walkie-talkies for communication between inside and outside the vehicle. This method still has the following drawbacks: 1) The existing voice communication system lacks a wireless host and antenna, and the in-vehicle communication system lacks linkage with the external intercom equipment; 2) Existing voice communication systems suffer from poor communication quality and limited communication distance due to signal attenuation caused by tunnel walls. 3) The microphones of the existing voice communication system do not perform noise reduction processing on voice information. In the face of complex working environments, including engine noise and operating noise, the noise is large and the anti-interference and noise filtering performance is poor, making it difficult to meet the requirements of on-site operation and safety.

[0003] Among the existing technologies, the following documents are most similar to this application: Document 1 is a Chinese invention application filed by Tianjin Xilianteng Technology Development Co., Ltd. on March 27, 2017, and published on June 13, 2017, with publication number CN106850932A. This invention discloses a digital intelligent voice communication system, including an indoor main unit, several outdoor extension units, walkie-talkies, a router, and a multi-point monitoring and analysis computer. The indoor main unit and the outdoor extension units are connected by cables, the outdoor extension units are connected to the walkie-talkies via wireless signals, and the indoor main unit and the multi-point monitoring and analysis computer are respectively connected to the router. This invention is simple to install, convenient to use, provides seamless communication, clear sound, and enables mobile communication. Outdoor workers can monitor train operations at all times, avoiding safety hazards caused by poor communication. The digital intelligent voice communication system allows for real-time recording of the entire call, multi-point real-time monitoring, analysis, and communication at any station, and automatic uploading and long-term storage of recording files. However, this application is mainly for communication between indoor and outdoor areas of a station.

[0004] Document 2 is a Chinese invention application filed by Beijing Railway Communication & Signal Research & Design Institute Group Co., Ltd. on May 4, 2023, and published on June 6, 2023, with publication number CN116215615A. This invention discloses a method and system for remote dispatching and commanding railway shunting. At the first station where the dispatching and command center is located, key signals are collected via a first handheld intercom device; based on the key signals, remote control signals are sent to the second station via optical transmission equipment; and the communication status of the second station's section chief's station is set according to the remote control signals, enabling the dispatching and command center to remotely dispatch and command the work of the second station. This invention enables the dispatching and command center to monitor the dynamic voice communication content and shunting command sounds of on-site shunting operations at subordinate stations in real time, and achieves the effect of real-time dispatching and commanding through remote voice intercom. However, this application is intended for the dispatching and command center to monitor the dynamic voice communication content and shunting command sounds of on-site shunting operations at subordinate stations in real time, and achieve the effect of real-time dispatching and commanding through remote voice intercom.

[0005] Document 3 is a Chinese utility model patent applied for by Quanzhou Tietong Electronic Equipment Co., Ltd. on January 8, 2018, and published on August 7, 2018, with publication number CN207706173U. This utility model discloses a railway digital wireless train dispatching station radio, including a host computer with a wireless communication unit, a wired communication unit, a main control unit, a key display unit, a recording unit, and a power supply unit, as well as an operating terminal. The wireless communication unit, key display unit, recording unit, and power supply unit are connected to the main control unit via a CAN bus; the wired communication unit is connected to the main control unit via an RS422 interface; and the operating terminal is connected to the main control unit via a 2B+D interface. The wireless part of this utility model adopts TDMA digital wireless communication technology and dynamic channel allocation technology, enabling the station radio to simultaneously support multiple wireless terminal users' call functions; the wired part adopts E1 interface communication technology to meet the digital communication needs between station radios, dispatching radios, and monitoring switchboards; and based on 2B+D communication technology, it enables synchronous transmission of voice data communication and control signaling data communication, improving communication efficiency. However, this patent is mainly applicable to the digital communication needs between station radios, dispatch radios, and monitoring switchboards. Summary of the Invention

[0006] In view of this, the purpose of this application is to provide a vehicle-mounted voice communication method to solve the technical problems of existing voice communication methods, such as the lack of linkage between in-vehicle and external equipment, poor communication quality in tunnels, and inability to meet on-site operation and safety requirements.

[0007] To achieve the aforementioned objectives, this application specifically provides a technical implementation scheme for an in-vehicle voice call method, comprising the following steps: a) A wired intercom main unit and microphone are installed on at least two vehicles, and loudspeakers are installed inside and outside the vehicles, and the microphone and loudspeakers are connected to the wired intercom main unit; b) Install a wireless host on at least one vehicle, connect the wireless host to an antenna, and interconnect the wireless host with wired intercom hosts on the same vehicle and other vehicles via a first communication bus. c) Data communication between the inside of the vehicle, on / off the vehicle, in vehicle groups, and in vehicle platoons is realized through the wired intercom host and the wireless host.

[0008] Furthermore, in step c), the wireless intercom is connected to the wired intercom host via the second communication bus to realize data communication on / off the vehicle. The second communication bus uses high-frequency carrier communication.

[0009] Furthermore, the antenna is installed on the roof of the vehicle, enabling communication between the under-vehicle wireless intercom and the wired intercom host inside the vehicle. The antenna is in the same channel range as the high-frequency carrier.

[0010] Furthermore, the antenna is connected to the wireless host via a coaxial cable. In step c), the received high-frequency carrier signal is input to the wireless host for decoding and signal processing, restoring it to a normal voice signal, and then transmitted to the vehicle interior via the first communication bus, realizing voice communication between the under-vehicle wireless intercom and the in-vehicle wired intercom host. Simultaneously, the wired intercom host transmits the voice signal to the wireless host, which processes and encodes it, modulates it into a high-frequency carrier signal, and then broadcasts it via the antenna. Wireless intercoms on the same channel can all play the voice information, realizing voice communication between the in-vehicle wired intercom host and the under-vehicle wireless intercom.

[0011] Furthermore, the wired intercom host includes a central processing unit, a network port unit, a signal processing unit, a storage module, a signal amplification unit, and a first bus transceiver unit. In step c), the audio input from the microphone is processed by the signal processing unit and then converted into internal voice information by the central processing unit after logical operations. This voice information is then processed as follows: c1) One path of the voice information is transmitted to the signal amplification unit and output as an audio signal to the indoor and outdoor speakers connected to the wired intercom host of this vehicle to play the voice information; c2) The voice information is transmitted to the first bus transceiver unit, which transmits the voice information to other vehicles through the first communication bus. After signal processing and logic operation by the wired intercom host inside the other vehicles, the voice information is converted into voice information inside the other vehicles and played through the speakers inside and outside the other vehicles. c3) The third channel of the voice information is saved to the storage module, and the network port unit is used to debug the central processing unit or read the stored information from the outside.

[0012] Furthermore, in step c), the audio input from the microphone is acquired by the signal processing unit, compressed and encoded by the central processing unit, and converted into internal voice information. This voice information is then output to the speaker in the vehicle interior and / or via the signal amplification unit for D / A conversion and amplification to play the voice information, and is also sent to the first communication bus by the first bus transceiver unit.

[0013] Furthermore, in step c), voice information from other vehicles on the first communication bus enters the central processing unit from the first bus transceiver unit, is decoded by the central processing unit, undergoes D / A conversion and amplification by the signal processing unit, and is finally output to the indoor and / or outdoor speakers of the vehicle in this section for voice information playback.

[0014] Furthermore, the wireless host includes a main control unit, a signal modulation unit, an output matching unit, a power amplification unit, an antenna transceiver unit, an input matching unit, and a second bus transceiver unit. In step c), the antenna transceiver unit receives the wireless signal from the antenna. This wireless signal is matched with a set frequency band by the input matching unit. The matched wireless signal is then output to the signal modulation unit for signal modulation processing, compressed and encoded by the main control unit, and finally transmitted to the first communication bus via the second bus transceiver unit. The voice information to be played on the first communication bus enters the main control unit via the second bus transceiver unit. The main control unit first decodes the voice signal, then the signal modulation unit modulates the signal before sending it to the output matching unit for matching with a set frequency band. The power amplification unit amplifies the matched wireless signal before sending it to the antenna transceiver unit, which transmits a high-frequency carrier signal externally at a certain frequency through the antenna.

[0015] Furthermore, a power amplifier host is installed on the vehicle. The voice information output from the wired intercom host is amplified by the power amplifier host before being output to the outdoor speaker of the vehicle for playback. The voice information output from the wired intercom host is directly played by the indoor speaker of the vehicle.

[0016] Furthermore, a first rail engineering vehicle comprises several car sections, and the wired intercom unit of each car section is connected to the wireless unit of one of the other car sections via a wired bus. In step c), indoor communication within each car section is conducted through a microphone and indoor speakers, while the voice information from the microphones is simultaneously played outside the car through outdoor speakers. By setting the channel of the wireless unit to the same first frequency as the wireless intercom unit under the car, voice communication between the inside and outside of the car is achieved. A second rail engineering vehicle of the same model and configuration also comprises several car sections. The first and second rail engineering vehicles form a trainset. By setting the channels of the wireless units of the first and second rail engineering vehicles to the same second frequency, voice communication between the car trainsets is achieved. Another third rail engineering vehicle, of a different model but with the same configuration, also includes several vehicles. The first rail engineering vehicle, the second rail engineering vehicle, and the third rail engineering vehicle form a convoy. By setting the channels of the wireless host of the first rail engineering vehicle, the wireless host of the second rail engineering vehicle, and the wireless host of the third rail engineering vehicle to the same third frequency, voice communication between the convoy can be realized.

[0017] By implementing the technical solution of the in-vehicle voice call method provided in this application, the following beneficial effects are achieved: (1) The vehicle-mounted voice communication method of this application can realize communication between the inside of railway engineering vehicles, between vehicles and between vehicles, and between vehicles. Through the wired intercom host + vehicle-mounted wireless host + antenna, it can solve the problem of linkage between the in-vehicle voice communication system and the external intercom equipment. (2) The vehicle-mounted voice communication method of this application can solve the problems of poor communication quality and limited communication distance in tunnels by using vehicle-mounted wireless host + roof antenna. By using vehicle-mounted wireless host + antenna for signal relay and amplification, the communication quality of intercom devices in tunnels is improved. (3) The vehicle voice call method of this application can enhance and denoise the audio data collected by the vehicle microphone or Bluetooth headset, and can adapt to complex working environments including engine noise and operating noise, and solve the problem of poor anti-interference and noise filtering performance. (4) The vehicle-mounted voice communication method of this application is equipped with a storage module for the wired intercom host, which can record the call audio data, as well as the data transmitted between the handheld terminal, the wireless intercom and the CAN bus, so as to realize the traceability of important information and greatly improve the availability of the equipment. (5) The vehicle-mounted voice communication method of this application forms a portable smart wearable by configuring a Bluetooth headset for the handheld terminal, which can free the hands of on-site workers, improve work efficiency, and enhance the intelligence and informatization level of the communication system at the construction site. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a system structure block diagram of a specific embodiment of the in-vehicle voice call system on which the method of this application is based; Figure 2 This is a structural block diagram of a wired intercom host in a specific embodiment of the vehicle-mounted voice communication system upon which the method of this application is based; Figure 3 This is a block diagram illustrating the principle of audio input signal processing in a specific embodiment of the in-vehicle voice call system upon which the method of this application is based; Figure 4 This is a block diagram illustrating the principle of audio output signal processing in a specific embodiment of the in-vehicle voice communication system upon which the method of this application is based; Figure 5 This is a block diagram of the structure of the wireless host in a specific embodiment of the in-vehicle voice communication system on which the method of this application is based; Figure 6 This is a schematic block diagram of the structural composition of a specific embodiment of the in-vehicle voice call system on which the method of this application is based; Figure 7 This is a schematic block diagram of the structural composition of another specific embodiment of the in-vehicle voice call system on which the method of this application is based; Figure 8 This is a schematic diagram of the communication network structure of a specific embodiment of the in-vehicle voice call system on which the method of this application is based.

[0020] In the diagram: 1-Microphone, 2-Speaker, 3-Antenna, 4-Power Amplifier Main Unit, 5-Wired Intercom Main Unit, 6-Wireless Main Unit, 7-Wireless Intercom, 51-Central Processing Unit, 52-Network Port Unit, 53-Signal Processing Unit, 54-First Power Supply Module, 55-Storage Module, 56-Signal Amplification Unit, 57-First Bus Transceiver Unit, 61-Main Control Unit, 62-Signal Modulation Unit, 63-Output Matching Unit, 64-Power Amplification Unit, 65-Antenna Transceiver Unit, 66-Input Matching Unit, 67-Second Bus Transceiver Unit, 68-Second Power Supply Module. Detailed Implementation

[0021] For the sake of clarity and reference, the technical terms, abbreviations, or acronyms used below will be recorded as follows: CAN: Short for Control Area Network, used for communication in low-level control subnetworks; DMR: Digital Mobile Radio, short for the professional digital radio standard; MIC: Short for Microphone; SPK: Abbreviation for Speaker; UHF: Abbreviation for Ultra High Frequency; D / A conversion: short for Digital-to-Analog conversion.

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] As attached Figure 1 To be continued Figure 8 As shown, a specific embodiment of the in-vehicle voice call method of this application is given. The application will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1 As attached Figure 1 As shown, an embodiment of an in-vehicle voice communication system based on the method of this application specifically includes: a wired intercom host 5 and a microphone 1 installed on at least two vehicles; speakers 2 installed both inside and outside the vehicles; and microphones 1 and speakers 2 connected to the wired intercom host 5. At least one vehicle also has a wireless host 6 installed, connected to an antenna 3, and interconnected with the wired intercom hosts 5 on the same vehicle and other vehicles via a first communication bus. Unified data communication is achieved between the wired intercom host 5 and the wireless host 6, within the vehicle, between vehicles on / off the vehicle, in vehicle groups, and in vehicle platoons. The in-vehicle voice communication system also includes a wireless intercom 7, which is connected to the wired intercom host 5 via a second communication bus. The first communication bus uses CAN, Ethernet, or RS-485 bus communication. The second communication bus uses high-frequency carrier communication.

[0025] Antenna 3 is installed on the vehicle roof and enables communication between the under-vehicle wireless intercom 7 and the in-vehicle wired intercom host 5. Antenna 3 operates on the same high-frequency carrier frequency (UHF 400-470MHz). Antenna 3 is connected to the wireless host 6 via a coaxial cable. The received high-frequency carrier signal is input to the wireless host 6 for decoding and signal processing, restoring it to a normal voice signal, which is then transmitted to the vehicle interior via the first communication bus, enabling voice communication between the under-vehicle wireless intercom 7 and the in-vehicle wired intercom host 5. Simultaneously, the wired intercom host 5 transmits the voice signal to the wireless host 6, where it is processed, encoded, and modulated into a high-frequency carrier signal. This signal is then broadcast via antenna 3, allowing all wireless intercoms 7 operating on the same frequency to play the voice information, thus enabling voice communication between the in-vehicle wired intercom host 5 and the under-vehicle wireless intercom 7.

[0026] As attached Figure 2 As shown, the wired intercom host 5 further includes a central processing unit 51, a network port unit 52, a signal processing unit 53, a first power supply module 54, a storage module 55, a signal amplification unit 56, and a first bus transceiver unit 57. Audio input from the microphone 1 is processed by the signal processing unit 53 and then converted into internal voice information by the central processing unit 51 after logical operations. One path of the voice information is transmitted to the signal amplification unit 56 and output as an audio signal to the indoor and outdoor speakers 2 connected to the wired intercom host 5 of this vehicle for playback. The other path of the voice information is transmitted to the first bus transceiver unit 57, which transmits the voice information to other vehicles via the first communication bus. The wired intercom host 5 inside these other vehicles performs signal processing and logical operations, converting the information into internal voice information for those vehicles, which is then played back through the indoor and outdoor speakers 2 of those vehicles. The third channel of voice information is saved to the storage module 55. The external RJ45 interface is used to debug or read the stored information of the central processing unit 51 through the network port unit 52. The external 24V power input is processed by the first power module 54 to power the central processing unit 51.

[0027] As attached Figure 3 As shown, the audio input from microphone (MIC) 1 is acquired by signal processing unit 53, then compressed and encoded by central processing unit 51 and converted into internal voice information. This voice information is then converted and amplified by signal amplification unit 56 before being output to the speaker 2 inside the vehicle for playback. Alternatively, it is sent to the first communication bus by first bus transceiver unit 57. Microphone 1 is connected to wired intercom host 5. Microphone 1 is matched according to the on-site usage requirements, converting analog voice into digital signal, compressing it, and transmitting it to the bus data acquisition according to the protocol. Priority switching can be achieved via a switch (whoever presses the switch speaks).

[0028] As attached Figure 4 As shown, voice information from other vehicles on the first communication bus enters the central processing unit 51 via the first bus transceiver unit 57. The central processing unit 51 decodes the voice information, then the signal processing unit 53 performs D / A conversion and amplification, finally outputting the audio to the indoor and / or outdoor speakers (SPK) 2 of the vehicle in this section for playback. The indoor or outdoor speakers 2, according to system configuration requirements, retrieve signals from the CAN bus, decode them, convert the digital signals into analog signals, and amplify them to drive the speakers. Different vehicle models may have different microphones corresponding to different speakers, which is implemented through system configuration.

[0029] The wireless host 6 is compatible with both traditional analog and DMR standards. Its main function is to decode and process high-frequency carrier signals (such as UHF 400-470MHz). (See attached image) Figure 5 As shown, the internal structure of the wireless host 6 further includes a main control unit 61, a signal modulation unit 62, an output matching unit 63, a power amplification unit 64, an antenna transceiver unit 65, an input matching unit 66, a second bus transceiver unit 67, and a second power supply module 68. The antenna transceiver unit 65 receives wireless signals from the antenna 3. These signals are then matched with a set frequency band by the input matching unit 66. The matched wireless signal is output to the signal modulation unit 62 for signal modulation processing, then compressed and encoded by the main control unit 61, and finally transmitted to the first communication bus via the second bus transceiver unit 67. Voice information to be played on the first communication bus enters the main control unit 61 via the second bus transceiver unit 67. The main control unit 61 decodes the voice information, then the signal modulation unit 62 modulates the signal before sending it to the output matching unit 63 for matching with a set frequency band. The power amplification unit 64 amplifies the matched wireless signal before sending it to the antenna transceiver unit 65, which transmits a high-frequency carrier signal externally through the antenna 3 at a certain frequency. The external power input supplies power to the main control unit 61 through the second power module 68.

[0030] The voice information output by the wired intercom host 5 is played back to the speaker 2 inside the vehicle. The vehicle is also equipped with a power amplifier host 4. The voice information output by the wired intercom host 5 is amplified by the power amplifier host 4 before being played back to the speaker 2 outside the vehicle.

[0031] As attached Figure 6As shown, taking a three-car train as an example, each car is equipped with a wired intercom host 5. One wired intercom host 5 drives one indoor speaker 2, and simultaneously amplifies the signal through a power amplifier host 4 to drive two outdoor speakers 2; it receives voice signals through an indoor microphone 1; the wired intercom host 5 is connected via a CAN bus to transmit voice signals from other vehicles and to other vehicles; one of the cars (as shown in the attached diagram) Figure 6 In the second vehicle (of the three-section vehicles), the wireless host 6 is also connected in series to the CAN bus, and the vehicle-mounted antenna 3 is connected to the wireless host 6 via a coaxial cable. This wired + wireless vehicle-mounted voice communication system, designed for the specific vehicle model, effectively solves the communication problem between the inside and outside of the vehicle. Traditional walkie-talkies, when communicating inside or outside tunnels, suffer from poor communication quality and limited communication distance due to the shielding effect of the tunnel walls. The antenna 3 in this embodiment is specifically designed to solve this problem; it acts as a repeater. The high-frequency signal broadcast by the walkie-talkie is first relayed through the antenna 3, enabling communication with the inside of the vehicle while simultaneously transmitting signals from inside the tunnel to a greater distance.

[0032] In addition to CAN bus, the vehicle's internal bus can also use Ethernet or RS485 bus for communication, as shown in the attached diagram. Figure 7 As shown. In addition to the CAN bus, the wired intercom host 5 and the wireless host 6 can also be connected via a dedicated Ethernet or RS485 bus. Furthermore, the mapping between different microphones 1 and speakers 2 can be configured to meet the specific requirements of different vehicle models.

[0033] As attached Figure 8As shown, in a typical application scenario, a first-stage track engineering vehicle (such as a grinding vehicle A1) comprises several carriages (e.g., carriages 1, 2, and 3). The wired intercom unit 5 of each carriage is connected to the wireless unit 6 of one of the carriages via a wired bus. Indoor communication within each carriage is conducted through a microphone 1 and an indoor speaker 2. Simultaneously, the voice information from the microphone 1 is played outside the carriage through the outdoor speaker 2 (a power amplifier is needed between the wired intercom unit 5 and the outdoor speaker 2 to amplify the signal). The channel of the wireless unit 6 is set to the same first frequency (e.g., 401kHz, channel 1) as the wireless intercom unit 7 located outside the carriage, enabling voice communication between those inside and outside the carriage via this frequency. Another second rail engineering vehicle (grinding vehicle A2) of the same model and configuration also includes several cars (e.g., cars 1, 2, and 3). The first and second rail engineering vehicles form a trainset. If the two vehicles need to communicate, the radio host 6 of the first and second rail engineering vehicles are set to the same second frequency (e.g., 402kHz, channel 2) to enable voice communication between the trainsets (including onboard and offboard). Another third rail engineering vehicle of a different model and the same configuration (e.g., tamping vehicle B1) also includes several cars. The first, second, and third rail engineering vehicles form a convoy. If the person in charge of B1 communicates with the persons in charge of A1 and A2 (vehicle-to-vehicle communication), the radio host 6 of the first, second, and third rail engineering vehicles are set to the same third frequency (e.g., 403kHz, channel 3) to enable voice communication between the persons in charge of the convoy. If the other two grinding machines and one tamping machine also form a fleet, then the fleet leaders can communicate via voice through the same fourth frequency (e.g., 404kHz, channel 4).

[0034] Example 2 An embodiment of the in-vehicle voice call method of this application based on the system described in Embodiment 1, the method specifically includes the following steps: a) Install a wired intercom host 5 and a microphone 1 on at least two vehicles, install speakers 2 inside and outside the vehicles, and connect the microphone 1 and the speakers 2 to the wired intercom host 5. b) Install a wireless host 6 on at least one vehicle, connect the wireless host 6 to the antenna 3, and interconnect the wireless host 6 with the wired intercom host 5 on the same vehicle and other vehicles through the first communication bus. c) Data communication between the inside of the vehicle, on / off the vehicle, in vehicle groups, and between vehicle platoons is achieved through the wired intercom host 5 and the wireless host 6.

[0035] In step c), the wireless intercom 7 is connected to the wired intercom host 5 through the second communication bus to realize data communication on / off the vehicle. The second communication bus uses high-frequency carrier communication.

[0036] Antenna 3 is installed on the roof of the vehicle. It enables communication between the under-vehicle wireless intercom 7 and the wired intercom host 5 inside the vehicle. Antenna 3 is in the same channel range as the high-frequency carrier.

[0037] The wired intercom host 5 further includes a central processing unit 51, a network port unit 52, a signal processing unit 53, a storage module 55, a signal amplification unit 56, and a first bus transceiver unit 57. In step c), the audio input from the microphone 1 is processed by the signal processing unit 53 and then converted into internal voice information by the central processing unit 51 after logical operations. The voice information is then processed as follows: c1) The voice information is transmitted to the signal amplification unit 56 and output as an audio signal to the indoor and outdoor speakers 2 connected to the wired intercom host 5 of this vehicle to play the voice information. c2) The voice information is transmitted to the first bus transceiver unit 57, and the voice information is transmitted to other vehicles through the first communication bus. After signal processing and logic operation by the wired intercom host 5 inside the other vehicles, it is converted into voice information inside the other vehicles and played through the speakers 2 inside and outside the other vehicles. c3) The third channel of voice information is saved to the storage module 55, and the network port unit 52 is used to debug the central processing unit 51 or read the stored information from the outside.

[0038] In step c), the audio input from microphone 1 is acquired by signal processing unit 53, and then compressed and encoded by central processing unit 51 and converted into internal voice information. This voice information is output to the speaker 2 in the vehicle interior and / or via signal amplification unit 56 after D / A conversion and amplification. The other route is sent to the first communication bus by first bus transceiver unit 57.

[0039] In step c), voice information from other vehicles on the first communication bus enters the central processing unit 51 from the first bus transceiver unit 57. The central processing unit 51 performs voice decoding, and then the signal processing unit 53 performs D / A conversion and amplification processing. Finally, the voice information is output to the indoor and / or outdoor speakers 2 of the vehicle in this section for playback.

[0040] The wireless host 6 further includes a main control unit 61, a signal modulation unit 62, an output matching unit 63, a power amplification unit 64, an antenna transceiver unit 65, an input matching unit 66, and a second bus transceiver unit 67. In step c), the antenna transceiver unit 65 receives the wireless signal from the antenna 3. This wireless signal is matched with a set frequency band by the input matching unit 66. The matched wireless signal is then output to the signal modulation unit 62 for signal modulation processing, and then compressed and encoded by the main control unit 61. Finally, it is sent to the first communication bus through the second bus transceiver unit 67. The voice information to be played on the first communication bus enters the main control unit 61 through the second bus transceiver unit 67. The main control unit 61 first decodes the voice information, and then the signal modulation unit 62 modulates the voice information before sending it to the output matching unit 63 for matching with a set frequency band. The power amplification unit 64 amplifies the matched wireless signal before sending it to the antenna transceiver unit 65, which then transmits a high-frequency carrier signal to the outside through the antenna 3 at a certain frequency.

[0041] A power amplifier host 4 is installed in the vehicle. The voice information output from the wired intercom host 5 is amplified by the power amplifier host 4 and then output to the outdoor speaker 2 of the vehicle for voice information playback. The voice information output from the wired intercom host 5 is directly played by the indoor speaker 2 of the vehicle.

[0042] Antenna 3 is connected to the wireless host 6 via a coaxial cable. In step c), the received high-frequency carrier signal is input to the wireless host 6 for decoding and signal processing, restoring it to a normal voice signal, and then transmitted to the interior of the vehicle via the first communication bus, realizing voice communication between the under-vehicle wireless intercom 7 and the in-vehicle wired intercom host 5. Simultaneously, the wired intercom host 5 transmits the voice signal to the wireless host 6, which processes and encodes it, modulates it into a high-frequency carrier signal, and then broadcasts it via antenna 3. Wireless intercoms 7 on the same channel can all play the voice information, realizing voice communication between the in-vehicle wired intercom host 5 and the under-vehicle wireless intercom 7.

[0043] A first rail engineering vehicle comprises several carriages, each carriage's wired intercom host 5 connected to the wireless host 6 of one of its carriages via a wired bus. In step c), indoor communication within each carriage is conducted through a microphone 1 and an indoor speaker 2, while the voice information from the microphone 1 is simultaneously played outside the carriage through the outdoor speaker 2. Voice communication between the inside and outside of the carriage is achieved by setting the channel of the wireless host 6 to the same first frequency as the wireless intercom 7 under the carriage. A second rail engineering vehicle of the same model and configuration also comprises several carriages. The first and second rail engineering vehicles form a trainset. Voice communication between the trainsets is achieved by setting the channels of the wireless host 6 of the first and second rail engineering vehicles to the same second frequency. Another third rail engineering vehicle of different model but with the same configuration also includes several vehicles. The first rail engineering vehicle, the second rail engineering vehicle and the third rail engineering vehicle form a fleet. By setting the channels of the wireless host 6 of the first rail engineering vehicle, the wireless host 6 of the second rail engineering vehicle and the wireless host 6 of the third rail engineering vehicle to the same third frequency, voice communication between the fleet can be realized.

[0044] This embodiment describes a technical solution based on the existing technical problems of vehicle-mounted communication for large-scale road maintenance machinery in China. It proposes a vehicle-mounted voice communication method to address the issues of lack of linkage between existing communication systems and external intercom devices, poor communication quality and limited communication distance in tunnels, and poor anti-interference and noise filtering performance in complex operating environments, including engine noise and operational noise. This embodiment integrates internal and external communication within the same system, enabling linkage between in-vehicle communication and external intercom devices. By relying on a 6-wire wireless host and 3-antenna configuration for signal relay within tunnels, the problem of poor communication quality in tunnels is effectively solved. High-power transmission effectively achieves long-distance signal transmission, extending the communication distance. This embodiment can also perform voice enhancement and noise reduction processing on audio data collected at the construction site, and collect environmental noise and operational noise from the construction site in real time for noise cancellation. Meanwhile, the wired intercom host 5 in this embodiment is equipped with a storage module 55, which can record call audio data, as well as data transmitted between the handheld terminal (i.e., the wireless intercom 7), the wireless host 6, and the CAN bus, enabling traceability of important information and greatly improving the availability of the equipment. This embodiment can also form a portable smart wearable by equipping the handheld terminal with a Bluetooth headset, which can free the hands of on-site workers, improve work efficiency, and enhance the intelligence level of the construction site communication system.

[0045] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] In the description of this application, it should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly set on the other element or indirectly set on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0047] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0049] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this application can produce, should still fall within the scope of the technical content disclosed in this application.

[0050] By implementing the technical solution of the in-vehicle voice call method described in the specific embodiments of this application, the following technical effects can be achieved: (1) The vehicle-mounted voice communication method described in the specific embodiments of this application can realize communication inside railway engineering vehicles, between vehicles and under vehicles, and between vehicles. Through wired intercom host + vehicle-mounted wireless host + antenna, it can solve the problem of linkage between the in-vehicle voice communication system and the external intercom equipment. (2) The vehicle-mounted voice communication method described in the specific embodiments of this application can solve the problems of poor communication quality and limited communication distance in tunnels by using a vehicle-mounted wireless host and a roof antenna. By using a vehicle-mounted wireless host and an antenna for signal relay and amplification, the communication quality of intercom devices in tunnels is improved. (3) The in-vehicle voice call method described in the specific embodiments of this application can adapt to complex working environments including engine noise, operating noise, etc. by performing voice enhancement and noise reduction processing on the audio data collected by the in-vehicle microphone or Bluetooth headset, and solve the problem of poor anti-interference and noise filtering performance. (4) The vehicle-mounted voice call method described in the specific embodiments of this application is equipped with a storage module for the wired intercom host, which can record call audio data and data transmitted between the handheld terminal, the wireless intercom and the CAN bus, so as to realize the traceability of important information and greatly improve the availability of the equipment. (5) The vehicle-mounted voice communication method described in the specific embodiments of this application can form a portable smart wearable by configuring a Bluetooth headset for the handheld terminal, which can free the hands of on-site workers, improve work efficiency, and at the same time enhance the intelligence and informatization level of the communication system at the construction site.

[0051] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0052] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any way. Although this application has been disclosed above with reference to preferred embodiments, it is not intended to limit this application. Any person skilled in the art can make many possible variations and modifications to the technical solutions of this application using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the spirit and technical essence of this application. Therefore, any simple modifications, equivalent substitutions, equivalent changes, and modifications made to the above embodiments based on the technical essence of this application without departing from the content of the technical solutions of this application shall still fall within the protection scope of the technical solutions of this application.

Claims

1. A method for in-vehicle voice communication, characterized in that, Includes the following steps: a) Install a wired intercom host (5) and a microphone (1) on at least two vehicles, install a speaker (2) inside and outside the vehicles, and connect the microphone (1) and the speaker (2) to the wired intercom host (5); b) Install a wireless host (6) on at least one vehicle, connect the wireless host (6) to the antenna (3), and interconnect the wireless host (6) with the wired intercom host (5) on the same vehicle and other vehicles through the first communication bus. c) Data communication between the inside of the vehicle, on / off the vehicle, in vehicle groups, and between vehicle formations is realized through the wired intercom host (5) and the wireless host (6).

2. The in-vehicle voice call method according to claim 1, characterized in that: In step c), the wireless intercom (7) is connected to the wired intercom host (5) through the second communication bus to realize data communication on / off the vehicle. The second communication bus adopts high-frequency carrier communication.

3. The in-vehicle voice call method according to claim 2, characterized in that: The antenna (3) is installed on the roof of the vehicle. The wireless intercom (7) under the vehicle and the wired intercom host (5) inside the vehicle are communicated through the antenna (3). The antenna (3) is in the same channel range as the high frequency carrier.

4. The in-vehicle voice call method according to claim 3, characterized in that: The antenna (3) is connected to the wireless host (6) via a coaxial cable. In step c), the received high-frequency carrier signal is input to the wireless host (6) for decoding and signal processing, and restored to a normal voice signal. It is then transmitted to the interior of the vehicle via the first communication bus to realize voice communication between the undercarriage wireless intercom (7) and the in-vehicle wired intercom host (5). At the same time, the wired intercom host (5) transmits the voice signal to the wireless host (6). After signal processing and encoding by the wireless host (6), it is modulated into a high-frequency carrier signal and then broadcast through the antenna (3). Wireless intercoms (7) on the same channel can play voice information, thus realizing voice communication between the in-vehicle wired intercom host (5) and the undercarriage wireless intercom (7).

5. The in-vehicle voice call method according to any one of claims 2 to 4, characterized in that: The wired intercom host (5) includes a central processing unit (51), a network port unit (52), a signal processing unit (53), a storage module (55), a signal amplification unit (56), and a first bus transceiver unit (57); in step c), the audio input from the microphone (1) is processed by the signal processing unit (53) and then converted into internal voice information by the central processing unit (51) after logical operation; the voice information is processed as follows: c1) The voice information is transmitted to the signal amplification unit (56) and output as an audio signal to the indoor and outdoor speakers (2) connected to the wired intercom host (5) of this vehicle to play the voice information. c2) The voice information is transmitted to the first bus transceiver unit (57) through the first communication bus. The voice information is transmitted to other vehicles and converted into voice information inside other vehicles after signal processing and logic operation by the wired intercom host (5) inside the other vehicles. The voice information is played through the speakers (2) inside and outside the other vehicles. c3) The third channel of the voice information is saved to the storage module (55), and the network port unit (52) is used to debug or read the stored information of the central processing unit (51) from the outside.

6. The in-vehicle voice call method according to claim 5, characterized in that: In step c), the audio input from the microphone (1) is collected by the signal processing unit (53), and then compressed and encoded by the central processing unit (51) and converted into internal voice information. The voice information is output to the speaker (2) in the vehicle interior and / or the speaker (2) for voice information playback after D / A conversion and amplification by the signal amplification unit (56). The other route is sent to the first communication bus by the first bus transceiver unit (57).

7. The in-vehicle voice call method according to claim 6, characterized in that: In step c), voice information from other vehicles on the first communication bus enters the central processing unit (51) from the first bus transceiver unit (57), is decoded by the central processing unit (51), and then undergoes D / A conversion and amplification by the signal processing unit (53), and is finally output to the indoor and / or outdoor speakers (2) of the vehicle in this section for voice information playback.

8. The in-vehicle voice call method according to claim 2, 3, 4, 6 or 7, characterized in that: The wireless host (6) includes a main control unit (61), a signal modulation unit (62), an output matching unit (63), a power amplification unit (64), an antenna transceiver unit (65), an input matching unit (66), and a second bus transceiver unit (67). In step c), the antenna transceiver unit (65) receives the wireless signal from the antenna (3). The wireless signal is matched with a set frequency band by the input matching unit (66). The matched wireless signal is output to the signal modulation unit (62) for signal modulation processing and then compressed and encoded by the main control unit (61). And finally sent to the first communication bus through the second bus transceiver unit (67); the voice information to be played on the first communication bus enters the main control unit (61) through the second bus transceiver unit (67), is first decoded by the main control unit (61), and then the signal modulation unit (62) performs signal modulation processing before sending it to the output matching unit (63) to match with the set frequency band. The matching wireless signal is amplified by the power amplification unit (64) and then sent to the antenna transceiver unit (65) to send high-frequency carrier signals to the outside through the antenna (3) at a certain frequency.

9. The in-vehicle voice call method according to claim 8, characterized in that: A power amplifier host (4) is installed on the vehicle. The voice information output from the wired intercom host (5) is amplified by the power amplifier host (4) and then output to the outdoor speaker (2) of the vehicle for voice information playback. The voice information output by the wired intercom host (5) is directly played by the indoor speaker (2) of the vehicle.

10. The in-vehicle voice call method according to claim 2, 3, 4, 6, 7 or 9, characterized in that: A first rail engineering vehicle comprises several car sections, and the wired intercom host (5) of each car section is connected to the wireless host (6) of one of the car sections via a wired bus; in step c), indoor communication in each car section is conducted through a microphone (1) and an indoor speaker (2), while the voice information from the microphone (1) is played outside the car through the outdoor speaker (2); by setting the channel of the wireless host (6) and the wireless intercom (7) under the car to the same first frequency, voice communication between the inside and outside of the car is realized; another second rail engineering vehicle of the same model and configuration also comprises several car sections, and the first rail engineering vehicle... The first track engineering vehicle and the second track engineering vehicle form a train. By setting the channels of the wireless host (6) of the first track engineering vehicle and the wireless host (6) of the second track engineering vehicle to the same second frequency, voice communication between the trains can be realized. Another third track engineering vehicle of different models and the same configuration also includes several cars. The first track engineering vehicle, the second track engineering vehicle and the third track engineering vehicle form a convoy. By setting the channels of the wireless host (6) of the first track engineering vehicle, the wireless host (6) of the second track engineering vehicle and the wireless host (6) of the third track engineering vehicle to the same third frequency, voice communication between the convoy can be realized.

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