1.  sound intensity level
2.  acoustic intensity level

• 1. 声强级: sound intensity level | sound-energy flux density level | acoustic intensity level
• 2. 二．声强级: SIL
• 3. 声强度级: sound intensity level

更多释义

• 1.系统硬件电路包括音频数字信号源实现声音信号产生、数字声强级控制、多机数据通信、液晶显示和电源等模块单元。
  System hardware circuit audio digital signal source achieve this functions: sound signals, sound intensity level control, data communications, liquid crystal display, alarm and power.
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