超声射频信号的产生（RF Signal）
摘要：
RF is short for Radio Frequency. In communication engineering, The term “RF-signals” isused to denote signals containing frequency information in the frequency bands used for radiocommunication. The term RF has been adopted by the ultrasound industry, where it is used asa standard notation for unpro 阅读全文
posted @ 2011-11-03 17:12 burellow 阅读(4018) 评论(0) 推荐(0) 编辑
