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在进行有线电视系统前端载噪比指标的验算时 ,往往将单台调制器的载噪比指标参与前端载噪比的叠加 ,但所得的结果与实际的前端载噪比指标有一定的差异 ,这是因为忽视了有线电视前端多个频道组合之后载噪比指标降低这一因素。前端的载噪比通常是由调制器和前端宽带放大器两部分
When carrying out the verification of CATV system front-end carrier-to-interference ratio index, the carrier-to-interference ratio index of a single modulator is often involved in the superposition of front-end carrier to noise ratio, but the obtained result is different from the actual front- This is due to the neglect of the factor that the C / N ratio is reduced after the combination of multiple channels at the front of the cable TV. The front-end carrier-to-noise ratio is usually from the modulator and front-end broadband amplifier in two parts