Comprehensive recording unit applied to railway vehicle-mounted wireless communication equipment
By designing a comprehensive recording unit that includes a CIR interface and FPGA, the problem of incomplete recording of the locomotive driver's work process is solved, complete processing and storage of audio data is achieved, which facilitates subsequent data download and playback, and improves driving safety. and equipment management efficiency.
Patent Information
- Application Number
- CN202420287648.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-07
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-02-07
AI Technical Summary
The work process of the locomotive driver needs to be fully and truthfully recorded, including voice communication, operational behavior, equipment operation status and alarm information.
Design a comprehensive recording unit that includes a CIR interface and FPGA. The differential audio signal is collected through the CIR interface. The FPGA performs audio input processing, including rate conversion, filtering, level adjustment and audio data compression, and stores it in the NAND FLASH chip.
It achieves complete recording and storage of the locomotive driver's work process, facilitates subsequent data download and playback, and improves driving safety and equipment management efficiency.
Smart Images
Figure CN222380139U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mobile communications, in particular to a comprehensive recording unit applied to railway vehicle-mounted wireless communication equipment. Background Art
[0002] The integrated recording unit belongs to the field of mobile communication technology. It is applied to the locomotive onboard wireless communication equipment and can record the voice communication and operation behavior of the locomotive driver to ensure driving safety and record the operation status of the equipment.
[0003] During the operation of a railway locomotive, the locomotive driver needs to use the locomotive's onboard wireless communication equipment to communicate with the ground, receive data information, send alarm information, etc. The comprehensive recording unit must truthfully record the locomotive driver's work process, completely record all voice information, record the registration, deregistration, shutdown, startup, power failure, and reset process, record the carried business information, record dispatch communication operations, mode conversion, GSM-R signal strength in dispatch communication, and record alarm information during equipment operation. Utility Model Content
[0004] The purpose of the utility model is to provide a comprehensive recording unit applied to railway vehicle-mounted wireless communication equipment to solve the problem that the working process of the locomotive driver needs to be completely and truthfully recorded as mentioned in the above background technology.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an integrated recording unit applied to railway vehicle-mounted wireless communication equipment, comprising a CIR interface, wherein the CIR interface collects differential audio signals sent from an input interface, and further comprising an FPGA, wherein the FPGA is connected to a CPU system, and wherein the FPGA performs audio input processing on the audio signals passing through the CIR interface after fixed attenuation and AD sampling circuit conversion, wherein the audio input processing enables the audio data to enter the data storage system intactly.
[0006] Preferably, the audio input processing further includes rate conversion, the rate conversion is connected with filtering, the filtered signal is connected with level adjustment, the level adjustment is connected with audio data compression, and the audio data compression is connected with FIFO.
[0007] By adopting the above technical solution, the audio input processing rate is converted so that 64kSamp / s becomes 8kSamp / s.
[0008] Preferably, the data storage system is composed of a NAND FLASH chip.
[0009] The above technical solution is adopted to facilitate the storage and retrieval of data.
[0010] Preferably, the FPGA performs audio output processing by extracting the audio of the CPU system, and the audio output processing enables the audio data to be played through the USB interface, and the recorded voice information can be downloaded to a USB disk for inspection.
[0011] Using the above technical solution, the CPU system processes the audio.
[0012] Preferably, the audio output processing is sequentially through FIFO, audio data decompression, rate conversion, filtering and level adjustment.
[0013] By adopting the above technical solution, the audio is output through FPGA.
[0014] Preferably, the USB interface is a data download interface.
[0015] By adopting the above technical solution, the stored data can be downloaded and checked through the USB interface.
[0016] Compared with the prior art, the utility model has the following beneficial effects: the comprehensive recording unit applied to railway vehicle-mounted wireless communication equipment:
[0017] 1. The integrated recording unit used in railway onboard wireless communication equipment can perform complete audio input processing on audio data. The CIR interface collects the differential audio signal sent from the input interface, and after fixed attenuation by the audio isolation circuit, the AD sampling circuit digitizes it and then enters the FPGA;
[0018] 2. Further, inside the FPGA, the rate is converted from 64kSamp / s to 8kSamp / s, followed by 300~3400Hz digital filtering, and then the signal strength detection is performed on the filtered data stream, the signal level is automatically adjusted, and finally the audio data is compressed and stored;
[0019] 3. Furthermore, when data needs to be read, the CPU sends the compressed recording data to the sending FIFO, decompresses it, performs rate conversion, and finally sends it to DA conversion after output level adjustment. The stored information can also be automatically downloaded to a U disk through the USB interface. By inserting it into a computer, the recorded voice information can be played and checked. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic diagram of the structure of the comprehensive recording unit of the utility model;
[0021] Figure 2 This is a schematic diagram of the audio input processing structure of the utility model;
[0022] Figure 3 This is a schematic diagram of the audio output processing structure of the utility model; DETAILED DESCRIPTION
[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0024] See also Figure 1-3 The utility model provides a technical solution: a comprehensive recording unit applied to railway vehicle-mounted wireless communication equipment, including a CIR interface, a data storage system, a level adjustment, a CPU system, an FPGA, a filter, an audio data compression, a USB interface, a FIFO, and an AD sampling circuit.
[0025] Example 1
[0026] The integrated recording unit applied to railway onboard wireless communication equipment is provided with an audio input processing structure, which enables the audio data to enter the data storage system completely, specifically:
[0027] The CIR interface collects the differential audio signal sent from the input interface, and also includes an FPGA, which is connected to the CPU system. The FPGA can process the audio signal passing through the CIR interface after fixed attenuation and AD sampling circuit conversion. The audio input processing also includes rate conversion, which is connected to filtering, and the signal after filtering is connected to level adjustment, and the level adjustment is connected to audio data compression, which is connected to FIFO, and the data storage system is composed of a NAND FLASH chip;
[0028] First, the differential audio signal collected through the CIR interface is fixedly attenuated by the audio isolation circuit and then enters the AD sampling circuit for digitization. The sampling circuit has a 16-bit resolution, a sampling rate of 64kSamp / s, and an SNR of 76dB. The sampled digital audio signal is sent to the FPGA for processing. Inside the FPGA, the rate is first converted from 64kSamp / s to 8kSamp / s, followed by a 300-3400Hz digital filter. The signal strength of the filtered data stream is then detected, and the signal level is automatically adjusted according to the signal strength. A digital signal with a specified signal strength is output, and then the audio data is compressed. The ADPCM algorithm is used to ensure that the distortion is ≤5%, and the ECC algorithm is used for data error detection and correction. Finally, the audio data enters the data storage system composed of NANDFLASH chips. The NANDFLASH chip is used for information storage. A special algorithm is used to realize the identification and management of bad blocks in the storage space, and a lookup table (LUT) is used to complete the continuous reading and writing of data. According to the information type of the input interface, the corresponding lookup table is set respectively.
[0029] Example 2
[0030] On the basis of Example 1, the audio data can be played through the USB interface through the audio output processing, and the recorded voice information can be downloaded to the USB disk, specifically:
[0031] FPGA can process audio output by extracting audio from the CPU system. Audio output processing can play and check the recorded voice information and download it to the USB disk through the USB interface. The audio output processing is sequentially processed by FIFO, audio data decompression, rate conversion, filtering and level adjustment. The USB interface is the data download interface.
[0032] The stored audio data can be output (played) on the vehicle-mounted wireless communication device. At this time, the CPU system sends the compressed recording data to the sending FIFO, and the FPGA reads the data from the FIFO. After the audio data is compressed and decompressed, the rate is converted, and then filtered to restore it to 64kSamp / s digital audio. Finally, after the output level is adjusted, it is sent to DA conversion and restored to an analog signal (i.e. the recorded sound). At the same time, the stored information can also be automatically downloaded to a U disk through the USB interface. By inserting it into a computer, you can play and check the recorded voice information.
[0033] Working principle: When using the integrated recording unit applied to railway vehicle-mounted wireless communication equipment, all voice information can be completely recorded through audio input processing, and the compressed recording data can be sent to FIFO through the CPU system through audio output processing. The information can be extracted through the USB interface for easy inspection, which increases the overall practicality.
[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A comprehensive recording unit for railway onboard wireless communication equipment, comprising a CIR interface, wherein the CIR interface collects differential audio signals sent from an input interface, and is characterized in that: It also includes an FPGA, which is connected to the CPU system. The FPGA performs audio input processing on the audio signal passing through the CIR interface after fixed attenuation and AD sampling circuit conversion. The audio input processing allows the audio data to enter the data storage system completely.
2. The integrated recording unit for railway vehicle-mounted wireless communication equipment according to claim 1, characterized in that: The audio input processing also includes rate conversion, the rate conversion is connected to filtering, the filtered signal is connected to level adjustment, and the level adjustment is connected to audio data compression, and the audio data compression is connected to FIFO.
3. The integrated recording unit for railway vehicle-mounted wireless communication equipment according to claim 2, characterized in that: The data storage system is composed of NAND FLASH chips.
4. The integrated recording unit for railway vehicle-mounted wireless communication equipment according to claim 1, characterized in that: The FPGA extracts the audio from the CPU system and performs audio output processing, and the audio output processing enables the audio data to be played through the USB interface, and the recorded voice information can be downloaded to a USB disk.
5. The integrated recording unit for railway vehicle-mounted wireless communication equipment according to claim 4, characterized in that: The audio output process includes sequentially going through FIFO, audio data decompression, rate conversion, filtering and level adjustment.
6. The integrated recording unit for railway vehicle-mounted wireless communication equipment according to claim 4, characterized in that: The USB interface is a data download interface.