Development status and trend of automotive multimedia

Based on the development and current status of car audio, this paper summarizes the five major development characteristics, system concepts and system architecture of future automotive multimedia, and gives a brief introduction to the future development trend of automotive multimedia.

Keywords: car audio, car multimedia (Car MulTImedia), INFOTAINMENT, GPS navigation, TelemaTIcs, ITS intelligent transportation system.

1. Development status of automotive multimedia

Car audio equipment is the earliest electronic product used in cars. Although it is only an auxiliary device, it has no effect on the running performance of the car. The application is also becoming more and more important. After more than 80 years of development, it has evolved from the original car radio into a comprehensive multimedia in-vehicle electronic system that integrates multiple functions such as audio-visual entertainment, communication and navigation, and driving assistance. One of the basis for evaluating car comfort.

The history of the development of car audio is also the history of the development of electronic technology. Every major technological advancement in electronic technology is driving the development of car audio. As early as 1923, cars with radio radios appeared in the United States, and many cars followed suit, and radio radios were installed on the dashboard assembly. At that time, car radios used electron tubes. Until the semiconductor technology appeared in the 1950s, car radios saw a technological revolution. They replaced semiconductor tubes with semiconductor transistors and increased the life of car radios.

In the early 1970s, cassette recorders entered the market, and a dual-use car player that could play cassette tapes appeared on the car. At the same time, the movement began to use integrated circuits. Until the late 1980s, most car stereos were based on a card-type retractable dual-use machine and a pair of speakers. The speakers were divided into left and right channels, and some were placed on both sides of the dashboard assembly, and some were placed For the door, some are placed behind the rear seat, and the output power of the dual-purpose machine is mostly below 20 watts.

At the end of the 1990s, car audio entered a new milestone, developing towards high-power multi-output, multi-speaker surround sound, and multi-disc laser CD. The world's audio manufacturers have also opened up car audio as a specialized industrial department, taking full account of the car's sound effects for the special environment of the car, and using high and new technologies to manufacture car audio equipment.

Now, with the widespread application of multimedia storage media, NAND Flash-style virtual multi-disc CD Radio has been promoted, and plug-and-play car audio such as USB and SD cards have appeared in the market, and it is expected to replace the CD Radio with mechanical movement structure. . In order to improve the reception of car radios, the promotion of digital broadcasting (DAB, Word Space, XM Radio, Sirius Radio, etc.) has made car radios an epoch-making revolution. At the same time, the application of video is not far behind, since DVB has moved from home to vehicle in Europe, DMB has also started to get on track in Asia, especially the hosting of the Olympic Games has helped boost the application of DMB in China.

2. The development trend of automotive multimedia

In order to occupy market sales share, domestic and foreign car audio manufacturers continue to introduce various products with advanced performance and unique functions to attract users, such as: unique anti-theft system, optical fiber transmission, holographic laser head, electronic shockproof CD changer, edge Rotating anti-scratch movement, ultra-low intermediate frequency digital tuner, high-quality satellite tuner, sliding front operation panel, MASK new secret hiding mechanism, intelligent control turntable, dynamic subwoofer, dynamic road noise control, three-dimensional audio and video system , Voice recognition system, driver seat sound field simulation system, sound recording, etc. As the development of automotive multimedia, it has always been carried out around the following five characteristics, namely: 1) multi-function; 2) beautiful product design; 3) high-quality audio and video effects; 4) comprehensive information system and high security performance And 5) Ease of system operation, etc. Therefore, we can call car multimedia as an infotainment system (INFOTAINMENT = InformaTIon + Entertainment), and its concept can be integrated into Figure 1 and the car multimedia system architecture, as shown in Figure 2.

figure 1

figure 2

1) Multi-function: On the basis of the existing CD / DVD Radio, add a rear-seat display terminal, a roof display terminal, with dual-view or three-view display, Bluetooth phone hands-free, voice recognition, communication bus and system diagnosis And other functions, more and more diverse.

2) Beautiful product design: How to integrate car multimedia products with the entire instrument system of the car, this is the theme that car design continues to pursue, especially for the design of front-mounted car audio. In the design of the rear-mounted car audio products, the design of the panel is to pursue the perfect appearance. The wide display and the bright backlight system make people feel refreshed.

3) High-quality audio and video effects: The original car audio evolved from the original mono to two-channel output, from four-channel surround sound to the current Dolby Digital. Audio processors have evolved from the original linear potentiometer to analog audio processors and now digital processors. From the pursuit of the sound effect of the car audio itself to the setting of the spatial sound effect of a specific car system, various car noise collection and noise reduction processes are performed in order to achieve high-quality sound effects. Take Radio as an example, from the original AM radio to FM radio, from superheterodyne radio to FM / AM dual IF radio and now ultra-low IF radio, from analog circuit radio to current digital radio and satellite receiver ( SDAR). The application of each technology has greatly improved Radio's audio effects, and the receiving sensitivity and signal-to-noise ratio have been greatly improved. In this high-quality audio and video environment, the driver has a comfortable sensory enjoyment.

4) Comprehensive information system and high security performance: Car multimedia is no longer limited to audio and video systems, but a mobile multimedia terminal, a mobile car PC (AutoPC). It transcends the boundaries of time and space, can be in the car entertainment and network communication, and maintain close contact with the outside world, especially in the application of ITS, automotive multimedia system will become a comprehensive mobile information terminal, security performance is guaranteed in real time.

5) Ease of system operation: The functions of car multimedia are more and more, and the operation becomes more and more complicated. The operation mode ranges from traditional keys to the current touch screen, and from SWC and phone to speech recognition. Just as bank ATMs are accepted by the majority of users, how to enable end users to carry out easy operations without studying the instruction manual has become the focus of automotive multimedia products in HMI development.

In view of the above description of the development trend of automotive multimedia functions, a brief introduction to its market application prospects is as follows:

2.1. Vehicle-mounted system integrating audiovisual entertainment, communication, GPS navigation and positioning

As GPS has entered consumer applications, many manufacturers have actively entered the car navigation market, and various navigation products have emerged, especially the perfect combination of mobile communication technology (GSM, GPRS, 3G, etc.) and GPS positioning systems, making car entertainment The system has entered the ranks of the information society.

In terms of navigation products, the main focus is now on autonomous navigation and navigation. The map is mainly a two-dimensional map. With the improvement of GIS data and market demand, three-dimensional maps have gradually become the mainstream of the market. In terms of operational services, it is still mainly used in traffic scheduling, public security, taxi monitoring and management, and logistics distribution. In the future navigation products, their functions will be further expanded, and operation services will be the mainstream of the market. The in-vehicle part will be a mobile terminal, and a variety of different service providers will provide users with a more convenient, information-rich, and entertaining service carrier.

2.2. TelemaTIcs

Telematics is an important function of current high-end navigation products, and it is relatively mature in the North American and Japanese markets. OnStar and Wingcast are two companies that have developed rapidly in automotive mobile e-commerce. The former is a car service system introduced by General Motors in the mid-1990s, and the latter is a car mobile information service company established by Ford and Qualcomm in the United States. Other car manufacturers such as Mercedes-Benz, BMW, Toyota, etc. have also announced the investment in the development of automotive mobile service equipment. Its main functions and services are focused on road rescue, road condition navigation, mobile voice communication, etc. With the improvement of the transmission capacity of mobile communication systems and the maturity of e-commerce transactions and security mechanisms, more types of mobile commerce will emerge, such as wireless Internet access, online transactions, and mobile positioning services, with broad market prospects.

2.3. High application of network technology and ITS (Intelligent Transportation System) in automobiles

ITS (Intelligent Transportation System) collects all kinds of road traffic and service information collected by the traffic management center and transmits them to various users on the road transportation system, including drivers, residents, police stations, parking lots, transportation companies, Hospitals, ambulances and troubleshooting departments. Travelers can choose the traffic mode and traffic route in real time and charge without stopping; the traffic management department can automatically conduct traffic guidance, control and accident handling; the transportation department can keep track of the operation of the vehicle at any time and make reasonable dispatches to make the traffic on the road network operate At its best, improve traffic congestion and eliminate congestion, and maximize the capacity of the road network. Obviously, mobile target monitoring, scheduling and information services are one of the important components of the future intelligent transportation system (ITS). ITS is a large-scale network management technology. It must be supported by GPS and RFID technology. It has the functions of dynamic identification, real-time location tracking, wireless data transmission, and remote supervision and management. During the driving process, the driver can make full use of the global satellite positioning system to receive real-time road conditions and service data information around the location of the car, and then the computer selects the best driving route according to the traffic density, and transmits the driving route instructions The guidance system for the vehicle. In this way, not only can the overall performance of the car be greatly improved, the driving quality is improved, and the burden on the driver is reduced, but also the driver can always maintain close contact with the outside world. At the same time, the all-encompassing network will greatly alleviate the loneliness and loneliness of people in road congestion or long-distance driving.

3. Conclusion

In the future intelligent highway system, the driver can not only watch digital TV programs in the network car, but also obtain various traffic information (road conditions, traffic conditions, service facility locations, and tour guide information through the on-board computer and wireless communication, send and receive electronic Mail, etc.), choose the travel method, time and route reasonably. The driver can also use the on-board GPS to give the starting point and destination on the electronic map, and the computer can automatically select the best driving route based on real-time traffic information to avoid traffic congestion and congestion. It can be said that from Telematics system to ITS, it indicates that mobile target monitoring and service system has huge development prospects in the automotive application market. With the maturity of technology and the awakening of users' market awareness, Telematics and ITS will become the future mobile target monitoring and service One of the important development directions. It can be predicted that with the advancement of ITS in the future, automotive networking as a new starting point for automobiles will become an irresistible trend and trend in the development of automobiles in the 21st century.

references:

[1] The development status and trend of the world's automotive electronics industry network article

[2] Feng Qi Application and Development of Car Audio Products at Home and Abroad 2000.05 New Century Automobile Related Product Development and Exchange Seminar Organized by China Association of Automobile Manufacturers

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