CN203399237U - Vehicle digital television based on MOST 150 network - Google Patents

Abstract

The utility model discloses a vehicle-mounted digital TV based on the MOST150 network, which adopts a ring structure network based on the MOST vehicle-mounted network, including a MOST150 video transmission source node and a MOST150 video transmission destination node; the MOST150 video transmission source node is received by the vehicle-mounted digital TV signal The processing module and the MOST video input module are composed, and the MOST150 video transmission destination node is composed of the MOST video output module and the vehicle host display; the vehicle digital TV signal receiving and processing module and the MOST video input module perform data transmission through the DVI-D interface, and the MOST video input module Data transmission is carried out with the MOST video output module through optical fiber, and the video signal output by the MOST video output module is transmitted to the vehicle-mounted host display through the DVI data line. The utility model can improve the flexibility and transmission bandwidth of the vehicle-mounted digital TV.

Description

A Car Digital TV Based on MOST150 Network

technical field

The utility model relates to an automobile automatic control technical equipment, in particular to a vehicle-mounted digital TV based on the MOST (Media Oriented Systems Transport) 150 network.

Background technique

Today, with the vigorous development of the automotive electronics industry, and with the continuous improvement of people's quality of life, the requirements for in-vehicle infotainment systems are also getting higher and higher. Vehicle-mounted TV is a TV system that is installed in the car and played mobile with the car. It broadcasts TV programs and advertising programs through wireless digital signal transmission and terrestrial digital equipment reception; the mobile digital signal adopts the most advanced digital TV in the world today. Single frequency network technology (DTTB, Digital Television Terrestrial Broadcasting), broadcasts TV programs through wireless digital signal transmission and terrestrial reception.

At present, in-vehicle digital TV set-top boxes are used to receive digital TV signals in China, and the received signals are directly transmitted to the on-board host, and digital TV programs are played through the driver of the host display screen. Such an on-board TV does not involve the on-board network. Only increase the function in the host part, generally use the AV cable to connect with the RGB port of the vehicle host. Although this kind of car digital TV is easy to install, because the display part is the composite analog video signal CVBS output, the host must contain a digital TV display driver module to support the playback of the composite analog video signal CVBS when the video is played, which makes the specificity of the car host Strong, but poor reusability. In addition, because the data transmitted by the traditional vehicle-mounted digital TV is analog data, the TV playback effect is average.

MOST network is an in-vehicle bus network for multimedia data transmission. It has been widely used in high-end models of automobile manufacturers such as Audi and BMW. It can transmit high-fidelity audio data, high-definition video data and navigation and other asynchronous packet data. Car multimedia entertainment system is the first choice. However, after consulting relevant literature, there is no car digital TV based on MOST network in the domestic market.

Contents of the invention

In order to solve the problems of low transmission bandwidth and poor reusability of the existing vehicle-mounted digital TV, the utility model provides a vehicle-mounted digital TV based on the MOST150 network, enabling the driver and passengers to watch digital TV programs in real time, with simple configuration and improved vehicle-mounted digital The flexibility and transmission bandwidth of TV can enhance the functionality, entertainment and comfort of the vehicle.

The purpose of the invention of the utility model is achieved through the following technical solutions:

Provide a vehicle-mounted digital TV based on the MOST150 network, which adopts a ring structure network based on the MOST vehicle network. The ring structure network mainly includes a MOST150 video transmission source node and a MOST150 video transmission destination node; wherein, the MOST150 video transmission source node is provided by the vehicle-mounted digital TV module and MOST video input module, the vehicle digital TV module includes vehicle digital TV signal receiving and processing module; MOST150 video transmission destination node is composed of MOST video output module and vehicle host display; vehicle digital TV module and MOST video input module through DVI-D Interface connection, MOST video input module and MOST video output module are connected through optical fiber, and MOST video output module is connected with vehicle host monitor through DVI data cable.

According to the utility model, a vehicle-mounted digital TV based on the MOST150 network is provided. The vehicle-mounted digital TV signal receiving and processing module mainly includes a signal receiving part and a signal processing part, wherein the signal receiving part mainly consists of a signal transceiver device and a mobile digital TV signal receiving module. , the signal processing part is mainly composed of a signal conversion module and a main control unit module; the signal receiving part uses an external antenna to receive and receive mobile digital TV signals; the signal processing part is connected to the video input port of the MOST video input module through a DVI data line.

Provide a kind of vehicle-mounted digital TV based on MOST150 network according to the utility model, mobile digital TV signal receiving module selection model is the chip of SMS1184, signal conversion module selection model is the chip of GM7113C, main control unit module selection model is the chip of TCC9205.

According to the utility model, a vehicle-mounted digital TV based on the MOST150 network is provided. The MOST video input module includes a MOST video input board, and the MOST video output module includes a MOST video output board; D interface electrical connection, MOST video input board mainly includes input video processing module, video compression and decompression module, external host and INIC intelligent network controller; MOST video output board The output board mainly includes output video processing module, video compression and decompression module, external host and INIC intelligent network controller.

According to the utility model, a vehicle-mounted digital TV based on the MOST150 network is provided. The external host adopts a chip of the model AT32UC3B1256, and the INIC intelligent network controller selects the chip of the model OS81110. According to the vehicle-mounted digital TV based on the MOST150 network provided by the utility model, the external host adopts AT32UC3B1256 as the main control chip, and the INIC intelligent network controller selects the OS81110 chip.

Compared with the prior art, the utility model has the following advantages:

1. The utility model uses the MOST network for video transmission, which can transmit high-fidelity audio data, high-definition video data, etc., and improves the playback effect of the vehicle-mounted TV.

2. The utility model simplifies the set-top box part of the original vehicle-mounted digital TV and the display driving part of the vehicle-mounted host computer, combines the mobile digital signal receiving and signal processing modules, and directly converts it into a digital signal that can be recognized by the MOST network video input node , Comply with the network specification of MOST150 to transmit in the MOST network, and then improve the transmission bandwidth of digital TV.

3. This utility model designs the MOST ring network. According to the characteristics of the MOST ring network, digital TV nodes can be added flexibly, so as to meet the needs of different customers in the car, solve the shortcomings of the original car digital TV that cannot be reused, and improve the overall performance. The flexibility, comfort and functionality of the car.

Description of drawings

Fig. 1 is a MOST network structure diagram adopted by a vehicle-mounted digital TV based on the MOST150 network provided by the utility model.

Fig. 2 is a structural block diagram of a vehicle-mounted digital TV based on the MOST150 network provided by the utility model.

Fig. 3 is a structural block diagram of a vehicle-mounted digital TV signal receiving and processing module of a vehicle-mounted digital TV based on the MOST150 network provided by the utility model.

Fig. 4 is a schematic block diagram of the overall structure of the MOST150 video board of a vehicle-mounted digital TV based on the MOST150 network provided by the utility model.

Fig. 5 is a circuit diagram of a MOST150 video compression and decompression module of a vehicle-mounted digital TV based on the MOST150 network provided by the utility model.

Fig. 6 is a circuit diagram of an INIC intelligent network controller of a vehicle-mounted digital TV based on a MOST150 network provided by the utility model.

Figure 7 is a circuit diagram (1) of the main control part of the MOST150 video board of a vehicle-mounted digital TV based on the MOST150 network provided by the utility model.

Figure 8 is a circuit diagram (2) of the main control part of the MOST150 video board of a vehicle-mounted digital TV based on the MOST150 network provided by the utility model.

Fig. 9 is a circuit diagram of the I ² C interface between the AT32UC3B1256 microcontroller and the OS81110MOST intelligent network interface controller used in a vehicle-mounted digital TV based on the MOST150 network provided by the utility model.

Detailed ways

Below in conjunction with accompanying drawing, further illustrate the specific embodiment of the present utility model.

Referring to Fig. 1, a kind of vehicle-mounted digital TV based on MOST150 network adopts a ring structure network based on MOST vehicle network, and the ring structure network mainly includes MOST150 video transmission source node and MOST150 video transmission destination node; wherein MOST150 video transmission source node It is composed of a vehicle-mounted digital TV (DTV) module and a MOST video input module. The vehicle-mounted digital TV (DTV) module includes a vehicle-mounted digital TV signal receiving and processing part; the MOST150 video transmission destination node is composed of a MOST video output module and a vehicle-mounted host display.

As shown in Figure 2, the vehicle-mounted digital TV based on MOST150 network mainly includes the following four modules: vehicle-mounted digital TV (DTV) module, MOST video input module, MOST video output module, host display module; vehicle-mounted digital TV (DTV) module and The MOST video input module transmits data through the DVI-D interface; the MOST video input module and the MOST video output module transmit data through optical fiber; the video signal transmitted by the MOST video output module is transmitted to the host display screen through the DVI data cable.

Referring to Fig. 3, the vehicle-mounted digital TV signal receiving and processing module mainly includes a signal receiving part and a signal processing part, wherein the signal receiving part mainly consists of a signal transceiver device and a mobile digital TV signal receiving module (SMS1184), and the signal processing part mainly consists of a signal It consists of a conversion module (GM7113C) and a main control unit (TCC9205). The signal receiving part uses an external antenna to receive mobile digital TV signals, uses the SMS1184 chip to support CMMB mobile TV, uses the SMS1184 chip to process the received mobile digital TV signals, and converts them into CVBS composite video signals; the signal processing part mainly Responsible for processing the CVBS composite video signal output by the signal receiving part, use the signal conversion module (GM7113C) to convert the analog CVBS composite video signal into a digital signal in DVI format, and transmit it to the video input port of the MOST video board through the DVI data cable; the main control unit The module is responsible for the control and coordination of each part in the vehicle digital TV signal receiving and processing module.

The working process of the vehicle-mounted digital TV signal receiving and processing module is as follows: first, the signal transceiver device receives the wireless signal through the antenna, and at the same time sends the received signal to the signal processing input terminal of the SMS1184, and the SMS1184 processes the received signal and then transforms it into a For the CVBS composite video signal, under the control of the TCC9205 main control chip, the composite video signal output by the SMS1184 is sent to the input terminal of the analog-to-digital conversion chip, and the analog-to-digital conversion chip converts the analog composite video signal into a digital signal in DVI format Connect the output port of the analog-to-digital conversion chip with the input port of the MOST video board through the DVI data line, and transmit the digital signal output by the analog-to-digital conversion chip to the DVI-D interface of the MOST video board through the DVI data line. Compared with the existing car digital TV, the part of the digital TV set-top box is omitted, and the digital TV signal reception and video signal transmission responsible for the set-top box are integrated into one module, and the original digital TV directly outputs the CVBS composite analog video signal. In the way of output and display, the signal is processed and converted into a form of digital signal and sent to the network for transmission. The proposal of this program closely links the vehicle digital TV with the vehicle network.

The MOST150 video board is an important part of the car digital TV based on the MOST network. The main function of the MOST150 video board is the compression and decompression of video data and the transmission of frames on the MOST network. It is divided into a MOST video input board and a MOST video output board. MOST The video input board is electrically connected with the vehicle digital TV signal receiving and processing module through the DVI-D interface, and the MOST video output board is electrically connected with the vehicle host display through the DVI data line. The overall structure of the MOST150 video board is shown in Figure 4. The MOST video input board mainly includes an input video processing module, a video compression and decompression module, an external host (AT32UC3B1256) and an INIC intelligent network controller (OS81110); the MOST video output board mainly includes Output video processing module, video compression and decompression module, external host (AT32UC3B1256) and INIC intelligent network controller (OS81110). As shown in Figure 5, the video compression and decompression module is mainly responsible for compressing the received DVI digital signal into an H.264 video stream that can be transmitted on the MOST network. The specific process is that the digital signal is transmitted to the DVI of the MOST video input board through the DVI data line -D interface, the MOST video input board receives the processed DVI digital signal, and the OS8561X chip compresses the video and transmits it to the INIC part. Referring to Figure 6, it is INIC intelligent network controller (OS81110), which is mainly responsible for MOST network management and transmission of MOST network frames. INIC is composed of multiple ports, peripheral devices and MOST network are connected through ports. Referring to Figure 7 and Figure 8, the external host is shown as the main control part. The main control part of the MOST150 video board uses AT32UC3B1256 produced by Atmel Company as the main control chip, and the AT32UC3B1256 microcontroller in the main control module of the AT32UC3B1256 microcontroller is OS81110MOST The configuration controller of the intelligent network interface controller, the AT32UC3B1256 microcontroller controls the receiving and sending of MOST frames. Refer to Figure 9 for the I2C interface circuit between the AT32UC3B1256 microcontroller and the OS81092MOST intelligent network interface controller. The AT32UC3B1256 microcontroller is a high-efficiency, low-power 32-bit RISC microcontroller with 32K Bytes RAM inside and no external memory required. The MOST150 video board mainly realizes the transmission of video streams through the MOST network through a simple operation platform, and allows two or more video boards to be connected easily. The MOST150 network transmission part mainly adopts optical fiber transmission, which has the characteristics of fast transmission speed and high bandwidth.

The MOST150 video board is electrically connected with the vehicle-mounted digital TV signal receiving and processing module, and is responsible for MOST150 network startup, switching of video sources and transmission of video streams. The most important part of the MOST150 video board network communication is the MOST network frame transceiver module, which is connected to the MOST network through the MOST network interface, sends and receives data from the MOST network, and performs embedded MOST network management, network protection mode settings, hardware Apply watchdog timer settings and smart device management. The MOST150 video board mainly adopts the network controller for the MOST150 network specification. The MOST network interface selects the connector that complies with the MOST150 network specification to physically connect with the MOST network. The MOST network that complies with the MOST150 network specification uses optical fiber for signal transmission.

Claims (5)

1. the vehicle-mounted digital television based on MOST150 network, is characterized in that, it adopts the annular structural network based on MOST In-vehicle networking, and described annular structural network mainly comprises MOST150 transmission of video source node and MOST150 transmission of video destination node; Wherein, MOST150 transmission of video source node is comprised of vehicle-mounted digital television module and MOST video input module, and vehicle-mounted digital television module comprises vehicle-mounted digital television signal receiving processing module; MOST150 transmission of video destination node is comprised of MOST video output module and on-vehicle host display; Described vehicle-mounted digital television module is connected by DVI-Digital with MOST video input module, and MOST video input module is connected by optical fiber with MOST video output module, and MOST video output module is connected with on-vehicle host display by DVI data wire.

2. a kind of vehicle-mounted digital television based on MOST150 network as claimed in claim 1, it is characterized in that, described vehicle-mounted digital television signal receiving processing module mainly comprises signal receive section and signal processing, wherein, described signal receive section is mainly comprised of signal receiving/transmission device and mobile digital TV signals receiver module, and described signal processing is mainly comprised of signal conversion module and main control unit module; Signal receive section adopts the mode of external antenna transmitting-receiving to receive mobile digital TV signals; Signal processing connects the video input mouth of MOST video input module by DVI data wire.

3. a kind of vehicle-mounted digital television based on MOST150 network as claimed in claim 2, it is characterized in that, described mobile digital TV signals receiver module is selected the chip that model is SMS1184, signal conversion module is selected the chip that model is GM7113C, and main control unit module is selected the chip that model is TCC9205.

4. a kind of vehicle-mounted digital television based on MOST150 network as claimed in claim 1, is characterized in that, described MOST video input module comprises MOST video input plate, and MOST video output module comprises MOST video output board; MOST video input plate and vehicle-mounted digital television signal receiving processing module are electrically connected by DVI-Digital, and MOST video input plate mainly comprises input video processing module, video compression decompression module, external host and INIC intelligent network controller; MOST video output board is electrically connected by DVI data wire and on-vehicle host display, and MOST video output board mainly comprises output video processing module, video compression decompression module, external host and INIC intelligent network controller.

5. a kind of vehicle-mounted digital television based on MOST150 network as claimed in claim 4, is characterized in that, described external host adopts the chip that model is AT32UC3B1256, and INIC intelligent network controller is selected the chip that model is OS81110.

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