band-pass amplifier

The fluxgate signal processing circuit is formed by fluxgate exciting circuit, band -pass amplifier, phase -sensitive detector, integrals tache, feedback tache.

电路系统采用闭环控制,磁通门信号处理电路由磁通门激磁电源电路、选频放大器、相敏检波器、积分环节、反馈环节组成,实现了将环境磁场强度信号与电压信号转换。

This paper is involved in the analysis of oscillation starting condition, output voltage amplitude adjustment, and frequency selection network composition of sinu soidal coave oscillation circuit.

分析了用运算放大器组成正弦波振荡电路的起振条件和输出电压幅值的调节及选频网络的构成。

An interesting point is that the anomalous attenuation.

在强负跃层浅海的爆炸声实验中，发现当声源和接收器都位于跃层之上时，平均混响强度和某一航向的声传播损失在频率１０００－２０００Ｈｚ之间出现强烈的异常衰减现象，而且很有意思的是发射和接收均无指向性的平均混响强度的异常衰减与该航向声传播损失的异常衰减具有中心频率相同、带宽一致、附加衰减值相近的窄带共振或选频衰减特权。

Designing and realization of automatic changing step in selective lever meters based on single chip;

基于单片机的选频表自动变步长的设计实现