从实用的角度出发，概述了电化教学闭路电视系统前端部分的设计思路，从频道设置、线路设计、电平计算、设备选型等方面具体阐述了电化教学闭路电视系统前端设计的基本概念和方法。
This paper, by combining theory and practice, deals with the design of the front part of the dosed circuit TV system in the audio-visual teaching and some relative points for attention.
在教育行业专门从事多媒体闭路电视教学系统、多媒体教室设备的研制开发以及专业经销有线电视系统设备的高科技股份制公司。
The company also engages in research and development of multi-media closed-circuit-television teaching system, multimedia classroom equipment and cable TV system for education industry.
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