一种新型的调频同频信号插入器

调频同频信号插入器是有线调频、有线电视信号传输系统上的重要设备。让其实现低功耗、低成本并且接入方便维护简单是一个重要的课题。对此,提出了一种新型的调频同频信号插入器,适用于光纤与同轴电缆相结合的混合网络,可以广泛应用于现有广播电视系统。它主要采用了频率陷波技术,在滤除前端特定频率信号的同时,接入传输与前端同频的本地模拟与数字信号,有效地利用了本地区域内原有的有线广播电视设备。实验表明,该设备对原有线路没有任何干扰,并且能构建一种新颖简洁的调频播出系统模式,相比区域无线调频广播与区域有线共缆广播方式有很大的优势,具有很高的经济与实用价值。

A new signal inserter of frequency modulation and same-frequency

The signal inserter of frequency modulation (FM) and same-frequency is a vital equipment in the signal transmission system used for wired FM and cable television (CATV), so it is an important issue to make the power consumption and cost of it lower, and also more convenient to switch in and maintain. For the purpose, this paper designed a new signal inserter of FM and same-frequency for the hybrid network that combine of fiber and coaxial cable, and it can be widely used in the current broadcast systems. The inserter mainly used the technology of frequency trap, and it could access and transmit local analog or digital signal at the same frequency with the front-end when filter the specially designated frequency signal in the front-end, so this method made effective use of the current cable broadcast equipment in the local. Experimental results showed that there was no interference to the original circuit. It can structure a new and sample mode of FM broadcast system, and it has a greater relative advantage of the modes of regional FM radio and regional co-cable broadcast, in the general, it has a high economic and practical value.