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模拟信号是传输模拟话音(图像)的电信号。模拟通信发展较早,而且是比较成熟的通信体制,性能比较稳定,但有以下缺点: 1.抗干扰能力差由于传输的是模拟电信号,容易受到各种杂波干扰,如果这些干扰信号在话音频带内,就很难完全排除,长途通信时,干扰会积累,严重地影响信噪比,这
An analog signal is an electrical signal that carries analog voice (image). Analog communications developed earlier, and is more mature communication system, the performance is relatively stable, but has the following disadvantages: 1. Anti-interference ability is poor because of the transmission of analog electrical signals, susceptible to various clutter interference, if these interference signals in the In the voice band, it is difficult to completely rule out interference. When long-distance communication is carried out, the interference will accumulate, seriously affecting the signal-to-noise ratio, which