【求助】两个滤波器函数~。。

rcosfir rcosflt 这两个函数就是升余弦滤波器啊，用法和其他滤波器没有什么不同喽。。。 对于数字信号的过采样 我印象里有这样一个用处：过采样的信号处理起来对低通滤波器的要求相对较低，如果不过采样，滤波的时候滤波器需要很陡峭，指标会很严格

ADC is the device to value the continue signal in digital way. So, the first step is to do the sampling. In ADC, the accuracy of the ADC is mainly limited by the quantization error, the quantization error is depending on the sampling rate. It is easy to understand, if you sample the signal more frequently, you get more detail, right? So if you do the oversampling, of course will make ADC more accurate, but the cost will rise also. What QuestionMark said is also correct. But that is another issue of oversampling. His explanation is more suitable in the Communication system design, why the transmission is always running on high rate.

re！ 【 在 kidd 的大作中提到: 】 : ADC is the device to value the continue signal in digital way. So, the first step is to do the sampling. In ADC, the accuracy of the ADC is mainly limited by the quantization error, the quantization error is depending on the sampling rate. It is easy to understand, if you sample the signal more frequently, you get more detail, right? So if you do the oversampling, of course will make ADC more accurate, but the cost will rise also. : What QuestionMark said is also correct. But that is another issue of oversampling. His explanation is more suitable in the Communication system design, why the transmission is always running on high rate.