Discriminator: a device that converts a property of an input signal such as frequency or phase into an amplitude variation depending on how the signal differs from a standard or reference signal.
Standard four periodical rectangular patterns with typical spatial frequency and radiometric temperature were generated according to signal transfer equation.
该方法从红外成像系统信号传递方程出发，模拟生成不同空间频率、辐射温度的标准四周期矩形样条；
3
The design method of normal frequencystandardsignal source, which utilizes program control digital wave synthesis technology and achieved by microcontroller was given.