论文部分内容阅读
实验四、观察高频信号的调幅人们从收音机中收听的广播,从电视机中观看的电视节目,都是利用电磁波进行传播的.电磁波是怎样把声音、图象等信号发射出去的呢?这就是把声音和图象变为电信号,再把这种电信号加到能发射电磁波的高频信号上面去.把要传递的信号加到高频信号上去的方法叫调制,被加上去需要传递的信号叫调制信号.最常用的调制方法是调幅,这是使高频信号的幅度随调制信号而改变.现在我们通过实验观察高频信号的调幅.
Experiment 4: Observing the Amplitude Modulation of High-Frequency Signals The broadcasts that people listen to from their radios and the television programs they watch from their televisions all use electromagnetic waves to transmit them. How does electromagnetic waves transmit signals such as sounds and images? Is the voice and image into electrical signals, and then add this electrical signal to the high-frequency electromagnetic signals can be transmitted to the signal to be transmitted to the high-frequency signal up the method called modulation, to be added to the need to pass Of the signal is called modulation signal.The most commonly used modulation method is amplitude modulation, which is to make the amplitude of the high-frequency signal changes with the modulation signal.Now we experimentally observe the high-frequency signal amplitude modulation.