A new subway vehicle-mounted communication device and a voice recording method thereof

Abstract

The present application relates to a kind of new subway vehicle communication device and its voice recording method, the device includes vehicle host computer and MMI, the vehicle host computer includes switching board, wireless access board and recording board, the MMI, wireless access board and recording board are connected with switching board by Ethernet bus, and the switching board completes the exchange of voice packet between relevant single board.Compared with prior art, the present application has high flexibility and other advantages.

Description

Technical Field

[0001] This invention relates to a subway vehicle-mounted communication device, and more particularly to a new subway vehicle-mounted communication device and its voice recording method. Background Technology

[0002] With the integration of wireless broadband communication technology with vertical industries, the subway industry is actively promoting the development and application of LTE-M / 5G technology. Subway onboard communication devices need to support new private network dispatch services such as LTE-M / 5G, in addition to supporting wireless private network dispatch services such as Tetra / GSM. The integrated development of multiple wireless standards is the main development direction of dispatch communication services in the subway industry.

[0003] The existing onboard equipment in subway systems primarily caters to the wireless dispatch and communication needs of services such as Tetra / GSM. In the existing voice recording scheme, voice transmission between the corresponding wireless access boards, control boards, recording boards, interface boards, and MMIs is all done in analog audio format. The merging of transmitted and received audio is achieved in the control board using a hardware adder, and the recording board converts the merged analog voice from the control board into digital voice for storage. The drawback of this scheme is that it uses pure hardware to transmit analog voice between various boards, resulting in poor scalability and flexibility, making it difficult to adapt to the development needs of broadband services such as LTE-M / 5G. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects of the prior art by providing a new subway vehicle-mounted communication device and its voice recording method.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] According to one aspect of the present invention, a new onboard communication device for subways is provided, comprising an onboard host and an MMI. The onboard host includes a switching board, a wireless access board, and a recording board. The MMI, the wireless access board, and the recording board are connected to the switching board via an Ethernet bus. The switching board performs the exchange of voice packets between relevant boards.

[0007] As a preferred technical solution, the wireless access board includes an external interface processing module, a service flow processing module, and an internal interface processing module connected in sequence.

[0008] As a preferred technical solution, the MMI includes a first interface processing module and a media information processing module that are interconnected.

[0009] As a preferred technical solution, the recording board includes a second interface processing module and a recording processing module that are interconnected.

[0010] As a preferred technical solution, the wireless access board enables voice access for different wireless dispatch communication services.

[0011] As a preferred technical solution, after receiving the audio stream from the MMI, the recording board writes the digital voice stream into the corresponding audio file to realize the voice recording and storage function. The user can export the audio recording to a USB flash drive through the USB interface of the recording board as needed.

[0012] According to another aspect of the present invention, a voice recording method for the new subway onboard communication device is provided, the method comprising:

[0013] (1) The wireless access board enables access to different wireless private network scheduling communication services;

[0014] (2) The switching board implements the Layer 2 Ethernet switching function to complete the transmission of audio media streams between the wireless access board, recording board and MMI inside the device;

[0015] (3) The MMI merges the audio media streams and forwards them to the recorder;

[0016] (4) The recording board enables the recording and storage of digital voice, and supports exporting voice recording files to a USB flash drive.

[0017] As a preferred technical solution, the wireless access board (1) enables access to different wireless private network scheduling communication services specifically as follows:

[0018] (101) Users configure different wireless access boards according to different wireless standards;

[0019] (102) The external interface processing module communicates with the corresponding external system and sends the audio media stream received from the external system's business flow to the business flow processing module.

[0020] (103) After receiving the audio media stream sent by the external interface processing module, if the media stream is analog audio, the business flow processing module converts it into PCM digital audio stream, encapsulates it into an RTP packet, and sends it to the internal interface processing module; if the media stream is digital audio stream, it forwards it directly to the internal interface processing module.

[0021] (104) The internal interface processing module sends the RTP media stream received from the business flow processing module to the MMI through the media stream UDP port.

[0022] As a preferred technical solution, the (3) MMI that merges the audio media streams and forwards them to the recorder specifically involves:

[0023] (301) After receiving the digital audio stream sent from the wireless access board through the media stream UDP port, the first interface processing module sends it to the media information processing module for processing;

[0024] (302) After receiving the audio stream from the service board from the first interface processing module, the media information processing module, under the control of the human-machine operation processing module, converts the audio stream into PCM format through software if it is an AMR or AMR-WB audio stream; under the control of the human-machine operation processing module, the media information processing module receives the input PCM audio stream from the audio input module; the MMI merges the PCM audio stream from the service board received from the first interface processing module and the PCM audio stream received from the audio input module, packages them into an RTP packet, and sends it to the recording board through the first interface processing module.

[0025] As a preferred technical solution, the (4) recording board realizes the recording and storage of digital voice, and supports exporting the voice recording file to a USB flash drive, specifically as follows:

[0026] (401) The second interface processing module of the recording board receives the RTP media stream sent by the MMI through the corresponding UDP port, and extracts the merged digital audio bitstream from the RTP packet and sends it to the recording processing module.

[0027] (402) After receiving the merged digital audio stream, the recording processing module stores and records the voice in *.WAV file format according to the call start time + the file name of the caller and the called party;

[0028] (403) Users can export the corresponding voice recording files as needed by inserting a USB flash drive into the USB interface of the recording board.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] 1. The voice recording solution of this invention realizes the digitization and IP-based processing of voice between internal boards. It can flexibly implement internal voice encoding and decoding through software, which has high flexibility and facilitates the integration of various wireless private network dispatch communication services. It also facilitates the expansion of new wireless dispatch communication services in the future according to development needs.

[0031] 2. The voice recording scheme of this invention realizes centralized processing of internal media streams. The MMI completes the merging function of voice collected by the input device and voice received from the wireless access board. It does not require the participation of the control board, nor does it require the recording board to realize the analog-to-digital conversion function of audio, thus reducing the complexity of the voice recording scheme as a whole.

[0032] 3. The new subway vehicle-mounted communication device of the present invention overcomes the shortcomings of analog voice being easily interfered with by digitizing the voice, thereby improving the voice quality of the recorded voice. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the voice recording scheme of the new vehicle-mounted communication device of the present invention;

[0034] Figure 2 This is a schematic diagram of the voice recording scheme of the new vehicle-mounted communication device of the present invention.

[0035] Figure 3 This is a schematic diagram of the voice recording scheme of the new vehicle-mounted communication device of the present invention. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0037] The new subway onboard equipment is designed to meet the needs of various wireless converged dispatch and communication services. In its voice recording scheme, voice between the various boards is transmitted using digital audio, and the control board does not participate in audio processing. This provides high flexibility and makes it very easy to expand new services.

[0038] like Figure 1 As shown, a new subway vehicle-mounted communication device includes an onboard host and an MMI. The onboard host includes a switching board, a wireless access board, and a recording board. The MMI, the wireless access board, and the recording board are connected to the switching board via an Ethernet bus. The switching board completes the exchange of voice packets between relevant boards.

[0039] (1) In this scheme, the wireless access board, recording board, and MMI are connected to the switching board via an Ethernet bus. The switching board completes the exchange of voice packets between the relevant boards. Specifically, as follows... Figure 2 As shown.

[0040] (2) In this scheme, the wireless access board implements voice access functions for different wireless dispatch communication services. When there is an ongoing dispatch call, inside the new vehicle-mounted communication device, after the wireless access board receives the corresponding voice stream from the external system, it first converts the analog audio to digital audio if necessary, then performs RTP encapsulation, and internally sends the voice media stream to the MMI through the UDP port of the audio media stream. Specifically, as follows... Figure 3 As shown.

[0041] (3) In this scheme, when there is an ongoing dispatch call, the MMI acquires audio from the audio input device and completes audio PCM encoding. Simultaneously, the MMI receives the audio stream from the wireless access board via the UDP port of the audio media stream, and can convert the audio stream to PCM encoding via software if necessary. The MMI merges the digital voice acquired from the audio input device with the digital voice received from the wireless access board, and sends the merged voice to the recording board for voice recording via the UDP port of the audio media stream. Specifically... Figure 3 As shown.

[0042] (4) In this solution, after receiving the audio stream from the MMI, the recording board writes the digital voice stream to the corresponding audio file, realizing the voice recording and storage function. Users can export the audio recordings to a USB flash drive via the recording board's USB interface as needed. Specifically, as follows... Figure 3 As shown.

[0043] Figure 3 This is a schematic diagram of the voice recording scheme for the new vehicle-mounted communication device, and its implementation method is as follows:

[0044] (1) The wireless access board enables access to different wireless private network scheduling communication services.

[0045] Users can configure different wireless access boards according to different wireless standards (such as 5G, LTE-M, Tetra, GSM, etc.).

[0046] The external interface processing module of the wireless access board communicates with the corresponding external system via wireless or wired connection, and communicates with the service flow processing module through internal physical or logical channels, sending the audio media stream received from the service flow of the external system to the service flow processing module.

[0047] After receiving the audio media stream from the external interface processing module, the business flow processing module converts the media stream into a PCM digital audio stream if it is analog audio, encapsulates it into an RTP packet, and sends it to the internal interface processing module. If the media stream is a digital audio stream such as AMR / AMR-WB carried by an RTP packet, it is directly forwarded to the internal interface processing module.

[0048] The internal interface processing module sends the RTP media stream received from the business flow processing module to the MMI through the media stream UDP port.

[0049] (2) The switching board implements the Layer 2 Ethernet switching function to complete the transmission of audio media streams between the wireless access board, recording board and MMI inside the device.

[0050] (3) MMI merges audio media streams and forwards them to the recorder.

[0051] The first interface processing module receives the digital audio stream sent from the wireless access board through the media stream UDP port and then sends it to the media information processing module for processing.

[0052] After receiving the audio stream from the service board from the first interface processing module, the media information processing module, under the control of the human-machine operation processing module, converts the audio stream into PCM format via software if it is an AMR / AMR-WB audio stream. Under the control of the human-machine operation processing module, the media information processing module receives the input PCM audio stream from the audio input module. The MMI merges the PCM stream from the service board received from the first interface processing module and the PCM stream received from the audio input module, packages them into an RTP packet, and sends it to the recording board through the first interface processing module.

[0053] (4) The recording board enables the recording and storage of digital voice, and supports exporting voice recording files to a USB flash drive.

[0054] The second interface processing module of the recording board receives the RTP media stream sent by the MMI through the corresponding UDP port, and extracts the merged digital audio bitstream from the RTP packet and sends it to the recording processing module.

[0055] After receiving the merged digital audio stream, the recording processing module stores and records the voice in *.WAV file format according to the call start time plus the file names of the calling and called parties.

[0056] Users can export the corresponding voice recording files as needed by inserting a USB flash drive into the recording board's USB port.

[0057] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A new onboard communication device for subways, characterized in that, It includes an in-vehicle host and an MMI. The in-vehicle host includes a switching board, a wireless access board, and a recording board. The MMI, the wireless access board, and the recording board are connected to the switching board via an Ethernet bus. The switching board completes the exchange of voice packets between relevant boards. The wireless access board is used to convert external audio media streams of different wireless dispatch communication services into digital audio streams, encapsulate them into RTP packets, and then send them to the MMI via the Ethernet bus. The MMI is used to receive RTP packets from the wireless access board via the Ethernet bus, and after merging multiple audio streams in software, repackage them into RTP packets and send them to the recording board via the Ethernet bus. The recording board is used to receive RTP packets via the Ethernet bus and extract digital audio streams for storage.

2. The new subway onboard communication device according to claim 1, characterized in that, The wireless access board includes an external interface processing module, a service flow processing module, and an internal interface processing module connected in sequence.

3. The new subway onboard communication device according to claim 1, characterized in that, The MMI includes a first interface processing module and a media information processing module that are interconnected.

4. A new onboard communication device for subways according to claim 1, characterized in that, The recording board includes a second interface processing module and a recording processing module that are interconnected.

5. A new onboard communication device for subways according to claim 1, characterized in that, The wireless access board enables voice access for different wireless dispatch communication services.

6. A new onboard communication device for subways according to claim 1, characterized in that, After receiving the audio stream from the MMI, the recording board writes the digital voice stream into the corresponding audio file, realizing the voice recording and storage function. Users can export the audio recording to a USB flash drive through the recording board's USB interface as needed.

7. A voice recording method for a new subway onboard communication device as described in claim 1, characterized in that, The method includes: (1) The wireless access board enables access to different wireless private network scheduling communication services; (2) The switching board implements the Layer 2 Ethernet switching function to complete the transmission of audio media streams between the wireless access board, recording board and MMI inside the device; (3) The MMI merges the audio media streams and forwards them to the recording board; (4) The recording board realizes the recording and storage of digital voice, and supports exporting the voice recording file to a USB flash drive.

8. The voice recording method according to claim 7, characterized in that, The wireless access board described in (1) enables access to different wireless private network scheduling communication services in the following ways: (101) Users configure different wireless access boards according to different wireless standards; (102) The external interface processing module communicates with the corresponding external system and sends the audio media stream received from the external system's business flow to the business flow processing module; (103) After receiving the audio media stream sent by the external interface processing module, if the media stream is analog audio, the business flow processing module converts it into PCM digital audio stream, encapsulates it into an RTP packet, and sends it to the internal interface processing module; if the media stream is digital audio stream, it forwards it directly to the internal interface processing module. (104) The internal interface processing module sends the RTP media stream received from the business flow processing module to the MMI through the media stream UDP port.

9. The voice recording method according to claim 7, characterized in that, The MMI (3) that merges the audio media streams and forwards them to the recorder specifically involves: (301) After receiving the digital audio stream sent from the wireless access board through the media stream UDP port, the first interface processing module sends it to the media information processing module for processing; (302) After receiving the audio stream from the service board from the first interface processing module, the media information processing module, under the control of the human-machine operation processing module, converts the audio stream into PCM format through software if it is an AMR or AMR-WB audio stream; under the control of the human-machine operation processing module, the media information processing module receives the input PCM audio stream from the audio input module; the MMI merges the PCM audio stream from the service board received from the first interface processing module and the PCM audio stream received from the audio input module, packages them into an RTP packet, and sends it to the recording board through the first interface processing module.

10. The voice recording method according to claim 7, characterized in that, The recording board described in (4) enables the recording and storage of digital voice, and supports exporting voice recording files to a USB flash drive. Specifically: (401) The second interface processing module of the recording board receives the RTP media stream sent by the MMI through the corresponding UDP port, and extracts the merged digital audio bitstream from the RTP packet and sends it to the recording processing module. (402) After receiving the merged digital audio stream, the recording processing module records it according to the call start time + the filenames of the calling and called parties, in order to... The .WAV file format stores and records audio. (403) Users can export the corresponding voice recording files as needed by inserting the USB flash drive into the USB interface of the recording board.

Images