Solution of Vehicle Communication Video and Audio System

Mobile video application

Recently, mobile video has developed into a feasible and even necessary accessory of car entertainment system. The selling point of several new recreational vehicles and small business vehicles is to take mobile video as an option. More and more people have considered installing video entertainment system on their vehicles.

Fig. 1 car audio-visual system using LCD display

There are many reasons for the rise of mobile video:

Entertainment application - car is an entertainment environment where you can play video games, watch movies, cartoons, regional TV and even satellite TV. Because of the progress of mobile video technology, all these can now be realized in cars, trucks, business cars and recreational vehicles.

Safety - when video is connected to the navigation system, it can send image and sound commands, which can increase travel efficiency and accuracy.

From the development trend, car entertainment has evolved from the traditional pure audio mode, such as MP3, to a display integrated system integrating user manual and navigation functions. The in car entertainment system now also provides all-round entertainment functions, and the size of the display ranges from 3-inch medium size to high-end 7-inch mode. The display content usually includes analog information (such as DVD player output or digital radio and television) and digital information (such as multimedia interface or interesting wallpaper). The image processing chip ssd1921 of Jingmen Technology Co., Ltd. has these characteristics that can meet this new market demand.

Ssd1921 image processor overview

Jingmen technology ssd1921 is an image processing chip with image capture and processing functions. The image content can be processed by ssd1921 and displayed on various types of LCD panels, such as STN, CSTN, low-cost delta panel, and high-definition strip TFT.

Figure 2 shows the application solution for car audio and video. Video decoding first converts CVBS (composite video signal) or S-Video signal into YCrCb (bt656 / bt601 digital format) and transmits it to the video input port of image processing chip ssd1921. If the video signal source meets the bt656 / bt601 standard, the design can be simplified, that is, there is no need to connect the video decoder. In most cases, the video input may not always correspond to the display panel at the ratio of 1:1, and ssd1921 has the function of "size adjustment", that is, the image data can be cropped and scaled before being written to the embedded SRAM. Therefore, NTSC / PAL video sources with various resolutions can be adjusted through this built-in scaling engine to be suitable for display on LCD panels with different resolutions.

Figure 2 ssd1921 solution for automotive audio and video applications

When the frame buffer in the 256Kb built-in memory is configured, the DVD image will be displayed on the LCD screen. This image processor can support up to 640x480 triangle arrangement (200KB) and 480xrgbx272 stripe arrangement (255kb). Color depth can be supported to 1, 2, 4, 5, 16 and 32 bits.

The built-in 2D image processing engine provides flexible screen display effects, including screen display, translucency, multilingual font acceleration, dynamic JPEG animation, image scaling, virtual display, portrait display mode, coverage function, hardware cursor function, line drawing, raster operation bit block transmission, color filling and expansion. The internal JPEG engine can provide a highly customized user interface. For example, the user can capture his / her favorite and interested DVD images as a screensaver, or take personal photos as wallpaper. To achieve this function, users need to store JPEG images on SD / MMC card in advance, and ssd1921 can obtain the pre stored images from SD / MMC, decode and display them on LCD.

Single chip integration solution for simplified application system

Jingmen technology ssd1921 image processing chip integrates these main characteristics for vehicle audio-visual applications: video input interface, JPEG codec, 2D image engine, SD card interface, MCU interface and display interface. The single chip solution plays an important role in reducing cost and simplifying the system in this application system.

Figure 3 structural block diagram of ssd1921

The video input port on the chip can accept the general 8-bit digital video signal format YUV422, ccir601 or ccir656. Because CMOS and CCD sensors also use these two interface standards, designers can directly connect the image source of the sensor to the video input port of ssd1921. In addition, the video image can also be transmitted to the video input port of the image processor at a maximum frame rate of 15 frames / second. In today's car audio-visual products, in addition to the function of DVD recording and playback, static picture display (such as operation menu display and photo display) is also a very important feature. The ssd1921 can support CMOS image capture with a maximum resolution of 1280x1024 (equivalent to 1.3m pixels). If the video source is too large to display, the chip's built-in extraction and clipping engine can scale or trim the input video with a fixed size (1, 2, 4, 8, 16) to match the display output. Images up to QVGA (320x240) 16bpp color depth can also be previewed by cutting and extraction engine. In addition, the chip can also realize color conversion, that is, color change from fixed YUV format to RGB format, including YUV422 to rgb565 and YUV422 to rgb888 format (32bit color depth with 8bit color mixing). The user can adjust the Y, u and V components according to the requirements of brightness and contrast.

JPEG encoding and decoding is pure hardware encoding and decoding. JPEG encoding and decoding can be completely separated from the operation of MCU (microcontroller unit). JPEG encoder compresses the video source into JPEG format and stores it in embedded memory, and supports JPEG encoding of various sizes up to 1280x1024. However, when the JPEG decoder receives a JPEG image from MCU or MMC / SD card and decodes the display, the size of the decoded image is limited by the display size or the size of the embedded memory. Extraction and clipping are two algorithms to reduce image size and memory requirements. Bus width and power consumption can also be saved accordingly. Cut and decompress the selected area of the whole picture, and non integer extraction can be realized by StretchBlt function in 2D image processing engine. Because the maximum resolution of the video input port is 1280x1024 and the embedded memory on the chip is only 256Kb, it is impossible to start JPEG compression after complete frame capture. The only way is to start compression while the image is captured.

A 2D image processing engine is built in the image processor. Its design is based on GDI (graphics device interface) of Microsoft Windows. It supports the following seven main functions:

Screen panning and scrolling;

Image rotation, including: 0, 90180270 degree rotation;

Cursor with three colors and transparency, the cursor can flash;

Line drawing;

Rectangle drawing;

Ellipse drawing;

Bit block transfer (BitBlt) - the purpose of bit block transfer engine is to transfer pixel data between CPU and video memory without the control of MCU. It can also be used to move pixel data from one specified position to another in video memory, so users can easily move a pixel pattern in video memory. The processing of larger images can be realized by repeating the transfer of hatch bit blocks several times. In addition, the color expansion function of the bit block transfer engine has the advantage of bit storage, so it can save memory. Allows users to apply Boolean logic functions to source and destination data, reflecting a high degree of flexibility in data management.

Similar to other controller chips of Jingmen technology, ssd1921 also integrates MCU interface and display interface. The wide range compatibility of these interfaces reduces the complexity of design. The display interface supports most panel types, including monochrome and color STN (4 / 8 / 12 / 16bit interface), TFT (9 / 12 / 18bit interface), hr-tft (18bit interface) and 8bit serial TFT interface. For STN and CSTN panels, spatial and dynamic jitter can increase color depth. In addition, ssd1921 provides direct interfaces to various MCU, including low-end 8bit and high-end 32bit MCU. These MCUs include Freescale 68K, Dragonball series, Renesas SH3 and SH4 series, and Intel StrongArm / Xscale series.

epilogue

Vehicle audio-visual system has become popular and has a very large potential market. Car entertainment will eventually become an important part of every car in the future. The monolithic integrated image processor such as ssd1921 is very suitable for various vehicle audio-visual applications. Its remarkable characteristics and simple system design help manufacturers speed up the introduction of products.

Solution of Vehicle Communication Video and Audio System 1

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