下采样WAV音频文件 [英] Downsampling wav audio file

问题描述

我必须在不使用任何外部Python库的情况下将wav文件从44100Hz下采样到16000Hz，因此最好使用wave和/或audioop.我尝试通过使用setframerate函数将wav文件的帧速率更改为16000，但这只会减慢整个记录的速度.如何将音频文件降采样为16kHz，并保持相同的音频长度?

I have to downsample a wav file from 44100Hz to 16000Hz without using any external Python libraries, so preferably wave and/or audioop. I tried just changing the wav files framerate to 16000 by using setframerate function but that just slows down the entire recording. How can I just downsample the audio file to 16kHz and maintain the same length of the audio?

推荐答案

您可以使用Librosa的load()函数，

You can use Librosa's load() function,

import librosa    
y, s = librosa.load('test.wav', sr=8000) # Downsample 44.1kHz to 8kHz

安装Librosa的额外工作可能值得安心.

The extra effort to install Librosa is probably worth the peace of mind.

提示:在Anaconda上安装Librosa时，还需要安装ffmpeg ，所以

Pro-tip: when installing Librosa on Anaconda, you need to install ffmpeg as well, so

pip install librosa
conda install -c conda-forge ffmpeg

这可以为您节省NoBackendError()错误.

This saves you the NoBackendError() error.

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