[问答题]什么是窗函数？描述窗函数的各项频域指标能说明什么问题？

参考答案：（1）窗函数就是时域有限宽的信号。其在时域有限区间内有值，频谱延伸至无限频率。
（2）描述窗函数的频域指标主要有最大旁瓣峰值与主瓣峰值之比、最大旁瓣10倍频程衰减率、主瓣宽度。
（3）主瓣宽度窄可以提高频率分辨力，小的旁瓣可以减少泄漏。

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