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MFCC: Mel频率倒谱系数计算感知频率和实际频率转换
2022-04-23 19:24:00 【ToneChip】
人的主观感知频率不一定是线性的,因此有一个实际频率和感知频率的对应关系.用上面的公式进行计算!
由于人耳基底膜对应不同的频率群(24个),对于同一个频率群中频率是会在大脑中叠加在一起进行评价
因此在频率群的临界带就可以分成一些的频率群组,组成一个滤波器组,就是Mel滤波器组
因为之前一直没搞懂书上写的1125*log(1 + f/700)
后面才发现matlab里面log默认就是以e为底进行计算
即log(x) = loge(x)
如果matlab里面要计算以2为底,则log2
下面验证一下上面的mel滤波器的计算公式
假设f = 1000
版权声明
本文为[ToneChip]所创，转载请带上原文链接，感谢
https://tonechip.blog.csdn.net/article/details/121838937
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