“signal-to-noise ratio”的概念、定义、习题解题方法及翻译-物理辞典

单词	signal-to-noise ratio
释义	signal-to-noise ratio A ratio of importance in electrical communication, especially in radio and television. Noise in this context refers to electrical disturbances that cause unwanted interference (crackling, hum, etc.) in radio and spoil the picture in television with ‘snow-storms’. Some electrical noise is caused by external electrical equipment, such as electric motors. In addition, fluctuations in electric current occur because the current consists of electrons, which have random movements. The signal-to-noise ratio of a signal is defined as the ratio of the amplitude of the signal to the mean amplitude of the noise
随便看	Schmidt camera Schottky defect Schottky effect Schrieffer, John Schrödinger equation Schrödinger's cat Schrödinger, Erwin Schwarzschild radius Schwinger effect scintillation camera scintillation counter sclerometer scotopic vision screen grid screw seaborgium search coil Searle's bar second secondary cell secondary colour secondary emission secondary winding secular magnetic variation sedimentation

物理辞典收录了3346条物理词条，基本涵盖了常用物理知识及物理英语单词词组的翻译及用法，是物理学习的有利工具。