将频率与音乐分开 [英] separate frequencies from music

问题描述

我想打印音乐文件中存在的单独频率.如果频率放大器 比阈值要好.然后会发亮.

i want to print separate frequency present in a music file. if freq amp is grater than threshold. then it will brinted.

import pyaudio
import wave
import numpy as np

chunk = 2048
wf = wave.open('/home/pi/music.wav', 'rb')
swidth = wf.getsampwidth()
RATE = wf.getframerate()
window = np.blackman(chunk)
p = pyaudio.PyAudio()
stream = p.open(format =
        p.get_format_from_width(wf.getsampwidth()),
        channels = wf.getnchannels(),
        rate = RATE,
        output = True)
data = wf.readframes(chunk)
while len(data) != '':
   stream.write(data)
   indata = np.array(wave.struct.unpack("%dh"%(len(data)/swidth),\
                                 data))
   fftdata=abs(np.fft.rfft(indata))**2
   freq1=np.fft.fftfreq(len(indata))
   for i in range(len(freq1)):
       freq = freq1[i]
       print freq
  data = wf.readframes(chunk)

打印频率为0.没有得到实际的频率

it is printing frequencies 0.something. not getting actual frequiencies

推荐答案

您在freq1上的循环是错误的.要将i用作freq1的索引，请尝试以下操作:

Your loop over freq1 is wrong. To use i as the index for freq1, try this:

for i in range(len(freq1):
    freq = freq1[i]
    print freq

或者，

for i in freq1:
    print i

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