AGC(automatic gain control) is used, namely, peak voltage of back wave signal after sampled is input to microprocessor, then A/D converter, D/A converter, gain control adjusting circuit to realize back wave signal AGC.
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美
- 采用自動(dòng)增益控制,即回波信號的峰值電壓經(jīng)過(guò)采樣后進(jìn)入單片機進(jìn)行 A/D 轉換,再經(jīng)過(guò) D/A 轉換和增益控制電路,形成回波增益的自動(dòng)控制;
