[英]Audio Frequency in Python
我制作了一个脚本,用于检查波形文件中的声音频率。 但是我一直在第 24 行出现错误,即while len(data) == chunk*swidth:
。 谁能帮我 ?? 我正在使用 PyAudio、wave 和 Numpy 来做到这一点。
# Read in a WAV and find the freq's
import pyaudio
import wave
import numpy as np
chunk = 2048
# open up a wave
wf = wave.open('output.wav', 'rb')
swidth = wf.getsampwidth()
RATE = wf.getframerate()
# use a Blackman window
window = np.blackman(chunk)
# open stream
p = pyaudio.PyAudio()
stream = p.open(format =
p.get_format_from_width(wf.getsampwidth()),
channels = wf.getnchannels(),
rate = RATE,
output = True)
# read some data data = wf.readframes(chunk)
# play stream and find the frequency of each chunk
while len(data) == chunk*swidth:
# write data out to the audio stream
stream.write(data)
# unpack the data and times by the hamming window
indata = np.array(wave.struct.unpack("%dh"%(len(data)/swidth),\
data))*window
# Take the fft and square each value
fftData=abs(np.fft.rfft(indata))**2
# find the maximum
which = fftData[1:].argmax() + 1
# use quadratic interpolation around the max
if which != len(fftData)-1:
y0,y1,y2 = np.log(fftData[which-1:which+2:])
x1 = (y2 - y0) * .5 / (2 * y1 - y2 - y0)
# find the frequency and output it
thefreq = (which+x1)*RATE/chunk
print ("The freq is %f Hz." % (thefreq))
else:
thefreq = which*RATE/chunk
print ("The freq is %f Hz." % (thefreq))
# read some more data
data = wf.readframes(chunk)
if data:
stream.write(data)
stream.close()
p.terminate()
这是错误消息Traceback (most recent call last): File "C:\\Users\\Admin\\Desktop\\Ishan\\Python\\Sublime Text Projects\\Sound Frequencies second.py", line 23, in <module> while len(data) == chunk*swidth: NameError: name 'data' is not defined
您在 while 中使用数据,稍后定义。 在进行后期检查时使用标志,减少预设为 True 以在第一轮开始:
# Read in a WAV and find the freq's
import pyaudio
import wave
import numpy as np
chunk = 2048
# open up a wave
wf = wave.open('output.wav', 'rb')
swidth = wf.getsampwidth()
RATE = wf.getframerate()
# use a Blackman window
window = np.blackman(chunk)
# open stream
p = pyaudio.PyAudio()
stream = p.open(format =
p.get_format_from_width(wf.getsampwidth()),
channels = wf.getnchannels(),
rate = RATE,
output = True)
# play stream and find the frequency of each chunk
flag = True # << define flag and set to True to make while 1st stap
while flag:
# read some data << move under while to this plase
data = wf.readframes(chunk)
# write data out to the audio stream
stream.write(data)
# unpack the data and times by the hamming window
indata = np.array(wave.struct.unpack("%dh"%(len(data)/swidth),\
data))*window
# Take the fft and square each value
fftData=abs(np.fft.rfft(indata))**2
# find the maximum
which = fftData[1:].argmax() + 1
# use quadratic interpolation around the max
if which != len(fftData)-1:
y0,y1,y2 = np.log(fftData[which-1:which+2:])
x1 = (y2 - y0) * .5 / (2 * y1 - y2 - y0)
# find the frequency and output it
thefreq = (which+x1)*RATE/chunk
print ("The freq is %f Hz." % (thefreq))
else:
thefreq = which*RATE/chunk
print ("The freq is %f Hz." % (thefreq))
# read some more data
# data = wf.readframes(chunk) << comment this line
if (len(data) != chunk*swidth): # << put check while condition
flag=False
if data:
stream.write(data)
# ^^^ I think you need to put in to the while loop upper
stream.close()
p.terminate()
我没有从整体上看工作能力,只有这个阶段的逻辑错误,循环时间和进入条件。
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