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信息的传递和处理是通过电子电路来实现的,而在电子电路中,这些信息则用一系列电流或电压的波形、数值和能量来表示的。因此最直接的方法自然是使电路中的电流和电压的变化,“模仿”信息(如声音)的变化而变化。这样一来,对电子电路的要求就比较严格。因为电路元件容差的变化和外界的干扰都会扰乱这种“模仿”的真实性,从而妨碍准确传送信息的目的。这类电路叫做“模拟电路”,平常所说的线性电路就属于这类电路,而无线电收讯机则是它的典型应用。除此之外对于其他一些应用(如电子数
The transmission and processing of information is achieved through electronic circuits, which are represented by a series of current and voltage waveforms, values and energies. Therefore, the most direct method is naturally to make the circuit current and voltage changes, “imitation” information (such as sound) changes. As a result, the requirements of the electronic circuit is more stringent. Because changes in the tolerance of the circuit components and external interference will disrupt the authenticity of this “imitation”, thus impeding the purpose of accurate transmission of information. This kind of circuit is called “analog circuit”. Usually, the linear circuit belongs to this kind of circuit, while the radio receiver is its typical application. In addition to other applications (such as electronic number