29-语音识别与图像识别的基础

-- coding: utf-8 --

from future import unicode_literals

import numpy as np

import numpy.fft as nf

import scipy.io.wavfile as wf

import matplotlib.pyplot as mp

读取音频文件

sample_rate, sigs = wf.read('../data/freq.wav')

sigs = sigs / 2 ** 15

times = np.arange(len(sigs)) / sample_rate

计算频率

freqs = nf.fftfreq(sigs.size, 1 / sample_rate)

ffts = nf.fft(sigs)

pows = np.abs(ffts)

绘图展示

mp.figure('Audio', facecolor='lightgray')

mp.subplot(121)

mp.title('时间域')

mp.subplot(122)

mp.title('频率域')