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
A frequency selector in L Band developed is a new microwave device,which the state of ON and OFF of filters is controlled by 2-bit TTL logic level.
该文研制的L波段选频器就是这种新型微波器件,由2位TTL逻辑电平控制4个滤波器的通断。
This paper describes that through extracting harmonic components of periodic signals of frequency selective circuit,computer simulation and measurement of cycle of fundamental triangle wave,3rd harmonic,5th harmonic,showes that results consistent with the theoretical analysis and validates the Fourier decomposition of the periodic signals.
通过选频电路对周期信号的谐波分量进行提取,并进行计算机仿真,测量了周期三角波的基波、3次谐波、5次谐波,结果与理论分析一致,验证了周期信号的傅里叶分解。