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1 引言 现在,模拟同轴电缆系统运营商们可以在不需为额外的转发器而增加投资的前提下享受各种各样的新型电视节目。随着边带技术的发展,一套或者多套数字电视节目可以与模拟电视节目共享现存的转发器。同时,伴随着基于现存转发器的数字边带技术的发展,那些过去被认为需要推迟或者遭受模拟传输技术所排斥的电视业务的实施将成为可能,并且极具吸引力。
1 Introduction Analog cable operators are now able to enjoy a wide range of new TV shows without having to invest in additional transponders. With the development of sideband technology, one or more sets of digital TV programs can share existing transponders with analog TV programs. At the same time, with the development of digital sideband technology based on existing transponders, the implementation of television services that were previously considered to be deferred or excluded from analogue transmission technologies will be possible and attractive.