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1) 噪声——是在电通信的传输途中,或由电的观测装置的输入端混入信号使它变成不能预测状态的干扰,或者说噪声是进入接收机的无用信号。这是模拟时代就有的定义。最近又出现了本质相同的定义:噪声是电路中可出现的必要信号以外的一切电信号,或者是:噪声是干扰信号,是妨害信号传输的杂波。在模拟时代,热噪声、散粒噪声等是主要的问题。在数字系统中,脉冲噪声(交流继电器,断路器,直流继电器等是噪声源),静电放电噪声,机架接地(FG)信号接地(SG)电平的波动也是主要的问题。2) 热噪声——随着真空管特性的稳定,可以将它做成放大器加以研究,由真空管产
1) Noise - Noise is the unwanted signal entering the receiver during the transmission of electrical communications, or by mixing the signal at the input of the electrical observer to an unpredictable state. This is the definition of the analog era. Recently there has been a definition of essentially the same: noise is all electrical signals other than the necessary signals that can appear in the circuit, or noise is an interfering signal that is a clutter that impedes signal transmission. In the analog era, thermal noise, shot noise and so on are the main problems. In digital systems, fluctuations in impulse noise (AC relays, circuit breakers, DC relays etc. as noise sources), ESD noise, and FG ground (SG) signal levels are also major issues. 2) Thermal noise - With the stability of the vacuum tube characteristics, it can be made into an amplifier to be studied by the vacuum tube