讯号对通道杂讯比 noise generator for signal channel: 信道噪声发生器signal plus noise to noise ratio: 信噪和对噪声比apparent signal to noise ratio: 视在质量噪声比available signal-to-noise ratio: 可用信号噪声比; 可用讯号对杂音比carrier signal to noise ratio: 载波信噪比下载手机词典可随时随地查词查翻译