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MSP430FR6043: 关于余弦插值处理互相关波形得到dtof

Part Number: MSP430FR6043

 为什么我的两个波形图不是图5 a、b这样对称的抛物线状,因此我无法得出信号的表达式。 ,该文档里也没有余弦插值的代码,能否提供?