播放器控制，充电，视频输出，和音频输出。
HT1625具有低功耗选择，接线简单和音频输出等特点。
HT1625 has the characteristics of low power dissipation choice, simple connection and audio output.
介绍了由GPS接收器、工控机和音频输出设备组成的公交车自动报站系统的功能、组成原理和关键技术，阐述了系统主要的硬件和软件设计方法。
The thesis analyses the function, the principles of composing and the key technology of GPS based buses'auto-announce system, also the hardware design and the software design are presented.
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