提高多媒体教室视听信噪比的措施

Measures to Enhance the Signal-to-Noise of Multimedia Classrooms

多媒体教室噪声问题常常影响整个系统放声效果和图象质量 ,不能体现教学过程的最优化。确保较“干净”的电源向音视频系统供电 ;隔绝由外界噪声产生的干扰噪声 ;音视频系统的信号传输正确配接是提高线路抗干扰能力的前提 ;

The noise issue often impacts the whole effect of audio amplification and the images' quality of multimedia classroom, which can't reflect the most optimization of instructional process. In order to restraint electromagnetic noise, some steps should be taken. The most fundamentally effective method is to establish shielding system and earth connection network.. Other measurements include: isolate the interference noise produced by outside noise; ensure relatively 'clean' power supply which can provide power-up to the audio and video system and guarantee the signals of the audio and video system to be transferred and attached correctly to improve the wiring's ability against interference.