汽车多媒体系统面临着严峻的技术挑战:如何在漫长的整个产品寿命周期中实现系统的可升级性?轿车和卡车的寿命通常都在十年以上。这就使汽车多媒体系统难以跟上消费电子产品和移动通信标准迅速变化的步伐。在大多数情况下,只更新多媒体软件是不够的,甚至是不可能的。许多应用,尤其是多媒体编解码器,还需要提高计算性能。然而,为将来的使用而设计具有“后备”计算能力的系统,既不经济, Automotive multimedia systems face tough technical challenges: How to achieve system scalability over a long, long product life cycle? Cars and trucks typically last for more than a decade. This makes car multimedia systems difficult to keep up with the rapid changes in consumer electronics and mobile communications standards. In most cases, it is not enough or even impossible to update only the multimedia software. Many applications, especially multimedia codecs, also need to improve computational performance. However, designing systems with “back-up” computing power for future use is neither economical nor,