背景灯光 meaning in English

light bias lamp

The system consists of an at89c51 single - chip microprocessor and interface circuits . when visitors or audience come near , the sensor will detects them and the system plays the commentary what is recorded in advance and in the same time , a special chip controls the lights from dark to light changing slowly . when no visitor there the lights become dark automatically , the energy - saving is achieved
该系统以89c51单片机为控制核心，利用热释电传感器自动探测是否有观众走近观看，通过软件模拟spi通讯协议控制单片语音录/放芯片播放录制好的解说词，同时控制灯光控制芯片控制展台的背景灯光的暗、亮，达到节能效果。