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数字音频广播现状 1、DAB-T地面数字音频广播 DAB-T需要解决多径干扰,移动接收问题,必须采用COFDM进行信道编码,必须采用时间交织和频率交织双重措施,以提高抗多径干扰的能力。这就造成了接收机价格昂贵,不为听众所接受。此外,DAB-T占用I-V频段(47～790MHz),与调频、电视所用频段相重叠,而且覆盖范围小,难于推广。
The current status of digital audio broadcasting 1, DAB-T terrestrial digital audio broadcasting DAB-T need to address the multipath interference, mobile reception problems, the use of COFDM channel coding must be time interleaving and frequency interleaving double measures to improve anti-multipath interference ability. This causes the receiver to be expensive and not acceptable to the listeners. In addition, the DAB-T occupies the I-V band (47 ~ 790MHz), which overlaps with the frequency bands used by FM and TV and has a small coverage and is difficult to popularize.