使用Java将音频从44.1kHz下采样到16kHz [英] Downsampling audio from 44.1kHz to 16kHz in Java

问题描述

我有一个应用程序，它记录来自用户麦克风的语音样本并将其上传到服务器，然后服务器对其进行处理。看来我必须使用以下参数进行记录，以避免 IllegalArgumentException ：

I have an application that records a speech sample from the user's microphone and uploads it to a server which then does some stuff with it. It seems I must record with the following parameters to avoid an IllegalArgumentException:

Encoding encoding = AudioFormat.Encoding.PCM_SIGNED;
float sampleRate = 44100.0F;
int sampleSizeInBits = 16;
int channels = 2;
int frameSize = 4;
float frameRate = 44100.0F;
boolean bigEndian = false;

但是我需要记录16khz而不是44.1，（sampleRate和framerate都是，我假设）它必须是单声道（1声道）。 PCM签名也是强制性的，所以这很好。 （服务器非常挑剔，我不能对它进行任何更改。）如何使用Java转换它？

But I need to have it recorded at 16khz, not 44.1, (sampleRate and framerate both, I assume) and it must be in mono (1 channel). The PCM signed is also mandatory, so thats good. (The server is VERY picky and I cannot make any changes to it.) How can I convert this using Java?

我通过HttpClient作为Filebody提交音频文件到一个servlet，将它保存在服务器上，然后处理它。

I am submitting the audio file via HttpClient as a Filebody to a servlet, saving it on the server, and then processing it.

推荐答案

这里有一些很好的链接可以开始使用你自己的：

Here are a few good links to get started on your own:

• 使用文件和格式转换器


• Java声音教程

• Using Files and Format Converters
• Java Sound Tutorial

或者（对于快速使用）这个免费库就是你想要的：

Alternatively (for quick use) this FREE library here is what you'd want:

• SampleRateConverter.java

• SampleRateConverter.java

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