音频特征提取和傅里叶变换
代码语言：javascript
复制#! /usr/bin/env python
# -*- coding: utf-8 -*-
# __author__ = "errrolyan"
# Date: 18-12-26
# Describe = "读取wav文件进行傅里叶变换获取频率值"
import wave as we
import numpy as np
import matplotlib.pyplot as plt
import sys
def wavread(path):
wavfile = we.open(path, "rb")
params = wavfile.getparams()
nchannels, sampwidth, framesra, frameswav = params[:4]
print("nchannels:%d" % nchannels)
print("sampwidth:%d" % sampwidth)
datawav = wavfile.readframes(frameswav)
wavfile.close()
datause = np.fromstring(datawav, dtype=np.short)
if nchannels == 2:
datause.shape = -1, 2
datause = datause.T
time = np.arange(0, frameswav) * (1.0 / framesra)
return datause, time, nchannels
def fft(path):
wavdata, wavtime, nchannels = wavread(path)
df = 1
freq = [df * n for n in range(0, len(wavdata))]
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