SoX(Sound eXchange)是命令行下的一套音频处理组件,号称“音频处理领域内的瑞士军刀。

它有windows、linux、MacOS X等平台下的多个版本。

NAME

SoX − Sound eXchange, the Swiss Army knife of audio manipulation

SYNOPSIS

sox [global-options] [format-options] infile1

[[format-options] infile2] ... [format-options] outfile

[effect [effect-options]] ...

play [global-options] [format-options] infile1

[[format-options] infile2] ... [format-options]

[effect [effect-options]] ...

rec [global-options] [format-options] outfile

[effect [effect-options]] ...

DESCRIPTIONIntroduction

SoX reads and writes audio files in most popular formats and can optionally apply effects to them; it can

combine multiple input sources, synthesise audio, and, on many systems, act as a general purpose audio

player or a multi-track audio recorder. It also has limited ability to split the input in to multiple output files.

All SoX functionality is available using just the sox command, however, to simplify playing and recording

audio, if SoX is invoked as play the output file is automatically set to be the default sound device and if

invoked as rec the default sound device is used as an input source. Additionally, the soxi(1) command provides

a convenient way to just query audio file header information.

The heart of SoX is a library called libSoX. Those interested in extending SoX or using it in other programs

should refer to the libSoX manual page: libsox(3).

SoX is a command-line audio processing tool, particularly suited to making quick, simple edits and to batch

processing. If you need an interactive, graphical audio editor, use audacity(1).

* * *

The overall SoX processing chain can be summarised as follows:

Input(s) ® Combiner ® Effects ® Output(s)

Note however, that on the SoX command line, the positions of the Output(s) and the Effects are swapped

w.r.t. the logical flow just shown. Note also that whilst options pertaining to files are placed before their

respective file name, the opposite is true for effects. To show how this works in practice, here is a selection

of examples of how SoX might be used. The simple

sox recital.au recital.wav

translates an audio file in Sun AU format to a Microsoft WAV file, whilst

sox recital.au -b 16 recital.wav channels 1 rate 16k fade 3 norm

performs the same format translation, but also applies four effects (down-mix to one channel, sample rate

change, fade-in, nomalize), and stores the result at a bit-depth of 16.

sox -r 16k -e signed -b 8 -c 1 voice-memo.raw voice-memo.wav

converts ‘raw’ (a.k.a. ‘headerless’) audio to a self-describing file format,

sox slow.aiff fixed.aiff speed 1.027

adjusts audio speed,

sox short.wav long.wav longer.wav

concatenates two audio files, and

sox -m music.mp3 voice.wav mixed.flac

......