VAD紀錄

       THU_energy=mag_max*0.05;                                                // 能量門檻值的上限 *0.05是設定的
        THL_energy=mag_max*0.01;                                                // 能量門檻值的下限 *0.01
        TH_zerocross=max_zer_cross_rate*0.5;