Evidently, there is another motion to be concerned with and that is the propagation of the modulation envelope . 顯然,還應(yīng)當(dāng)考慮另外一種運動,那就是調(diào)制包絡(luò)的傳播。
Time delay of the modulation envelope of a signal in passing through a channel or network 信號通過某個通道或網(wǎng)絡(luò)的過程中,經(jīng)調(diào)制的包絡(luò)線發(fā)生的時間上的延遲。