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通常一个正弦波可以用下式表示:??其中A(t)是正弦波的振幅、ω(t)是角频率、ф(t)是相位,这三个参量改变其中任意一个,都将产生一个新的正弦波.我们可以利用固定其中两个参量,改变另一个参量的办法来传递信息.这些办法分别叫做调幅、调频、调相.在数字传输技术中又分别叫做振幅键控、频率键控、相位键控.这三种传递信息的办法广泛地应用于遥控、遥测及通信设备中.一般地说:振幅键控最易
Usually a sine wave can be expressed as: where A (t) is the amplitude of the sine wave, ω (t) is the angular frequency and ф (t) is the phase. Changing any of these three parameters will produce A new sine wave.We can use the fixed two of them to change the other parameters of the way to transfer information.These methods are called AM, FM, phase modulation.In the digital transmission technology are also called amplitude keying, frequency key Control, phase keying. These three methods of transmitting information are widely used in remote control, telemetry and communications equipment. In general: the easiest amplitude keying