The system with signal peak voltage holding, A/D converter, microprocessor, D/Aconverter and voltage adjustment was introduced to realize the ultrasonic signal AGC.

 
  • (3)采用自動(dòng)增益控制,即信號的峰值電壓經(jīng)A/D變?yōu)閿底中盘査徒o單片機,再通過(guò)D/A和電壓調節電路調節增益控制電壓,實(shí)現測量信號的自動(dòng)增益控制。
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