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随着 生产技术 的不断发 展,尤其是频率合成技术和滤波技术的日趋完善,集成数字电路的普及提高使得在无线电波段通信开始广泛采用单边带调制制式。目前带有微处理装置的各种功率的单边带发信机已大量生产使用。 那么何为单边带通信呢?从调幅波的分析可知,调幅发射机送出的电波包括载波和上下两个边带,它不仅功率利用率低,而且占有的频带宽,在当前短波信道十分拥挤的情况下,这是个很大的缺点。我们知道,语
With the continuous development of production technology, especially the frequency synthesis technology and filtering technology are becoming more and more perfect, the popularization and improvement of integrated digital circuit makes the use of single-sideband modulation system widely in radio band communication. At present, single-sideband transmitters of various powers with microprocessors have been mass produced and used. So what is the single sideband communication? From the analysis of amplitude modulation wave, we can see that the radio waves sent by the AM transmitter include the carrier and the two sidebands, which not only have low power utilization, but also occupy the frequency bandwidth. In the current shortwave channel is very crowded This is a big disadvantage. We know, language