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随着广播电视数字化时代的到来,广播电视信号将以数字压缩的形式传输,首先根据信道的带宽和载噪比来选择适当的传输容量和调制方式,再通过对前端调制部分进行适当的技术改造,用正弦载波数字调制系统来产生受基带数字信号调制的模拟载波,以频带传输的方式,利用原模拟信道传输MPEG-2数字压缩电视信号,提高信道频带利用率,扩大节目容量,达到经济、可靠、有效的目的。
With the advent of the digital era of radio and television, the broadcast and television signals will be transmitted in the form of digital compression. First, the appropriate transmission capacity and modulation mode are selected according to the channel bandwidth and the carrier-to-noise ratio, and then the appropriate technical transformation of the front- , Using the sine carrier digital modulation system to generate the analog carrier modulated by the baseband digital signal, using the original analog channel to transmit the MPEG-2 digital compressed television signal in the way of frequency band transmission so as to improve the utilization of the channel frequency band and expand the capacity of the program to achieve economic, Reliable and effective purpose.