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通信系统的基本问题是它的有效性及可靠性。围绕着这两项基本的要求促进了通信技术的不断发展。调制解调技术、最佳接收技术和信道编码等领域的发展,目的均在于提高通信系统的可靠性。而多路复用技术则是为了在有限的信道容量中传送更多的信息。在数字通信中,还采用信源压缩编码技术和话音插空技术来提高通信系统的效率。它们两者的结合则往往能带来更好的效果。话音编码技术的目的在于寻求占用最小的信道容量来传输一路话音信号,以较低的比特
The basic problem with a communication system is its effectiveness and reliability. Around these two basic requirements to promote the continuous development of communications technology. Modulation and demodulation technology, the best receiver technology and channel coding and other areas of development, the purpose is to improve the reliability of the communication system. The multiplexing technique is to transmit more information in a limited channel capacity. In digital communication, it also uses source compression coding and voice insertion technology to improve the efficiency of communication systems. The combination of the two can often lead to better results. The purpose of speech coding technology is to seek to occupy the minimum channel capacity to transmit a voice signal, with a lower bit