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有线电视信号由微波网切换进入光电缆网传送电视节目。使频道数量增加,收视效果改善。但使用普通电视机(早期生产的电视机)用户,收视的频道数量不但没有增加,反而减少了,这是什么原因造成的呢?我国用于广播电视的频道为68个,其频率范围:1～5频道为48.5～92 MHz;6～1 2频道为1 6
Cable television signals are switched from the microwave network into the optical cable network to transmit television programs. Increase the number of channels, viewing results improved. However, the use of ordinary television (early production of TV) users, not only did not increase the number of channels did not increase, but decreased, what is the reason for this? China’s radio and television channels for 68, the frequency range: 1 ~ 5 channels are 48.5 ~ 92 MHz; 6 ~ 12 channels are 1 6