python - 用python检测并记录声音

Question

我正在使用这个程序在 python 中录制声音:

Detect & Record Audio in Python

我想更改程序以在声卡输入检测到声音时开始录音。可能应该以 block 为单位比较输入声级，但如何做到这一点？

Answer 1

你可以尝试这样的事情:

基于 this question/answer

# this is the threshold that determines whether or not sound is detected
THRESHOLD = 0

#open your audio stream    

# wait until the sound data breaks some level threshold
while True:
    data = stream.read(chunk)
    # check level against threshold, you'll have to write getLevel()
    if getLevel(data) > THRESHOLD:
        break

# record for however long you want
# close the stream

您可能想要调整 block 大小和阈值，直到获得所需的行为。

编辑:

您可以使用内置的 audioop用于查找样本均方根 (rms) 的软件包，这通常是您获得电平的方式。

import audioop
import pyaudio

chunk = 1024

p = pyaudio.PyAudio()

stream = p.open(format=pyaudio.paInt16,
                channels=1,
                rate=44100,
                input=True,
                frames_per_buffer=chunk)

data = stream.read(chunk)

rms = audioop.rms(data, 2)  #width=2 for format=paInt16