今天我给大家介绍一款自称是音频处理界的瑞士军刀的一款开源软件，SoX – Sound eXchange。引用主页上介绍的原话：
SoX是一个跨平台(Windows, Linux, MacOS X, etc.)命令行程序，用于各种格式的转换，播放和各种音频格式，以及给音频加入特效。 下图是一个运行的实例。
Raw files in various binary formats
Raw textual data
Amiga 8svx files
Apple/SGI AIFF files
SUN .au files
- PCM, u-law, A-law
- G7xx ADPCM files (read only)
- mutant DEC .au files
- NeXT .snd files
AVR files
CDDA (Compact Disc Digital Audio format)
CVS and VMS files (continuous variable slope)
Grandstream ring-tone files
GSM files
HTK files
LPC-10 files
Macintosh HCOM files
Amiga MAUD files
AMR-WB & AMR-NB (with optional libamrwb & libamrnb libraries)
MP2/MP3 (with optional libmad, libtwolame and libmp3lame libraries)
MP4, AAC, AC3, WAVPACK, AMR-NB files (with optional ffmpeg library)
AVI, WMV, Ogg Theora, MPEG video files (with optional ffmpeg library)
- Ogg Vorbis files (with optional Ogg Vorbis libraries)
- FLAC files (with optional libFLAC)
- IRCAM SoundFile files
- NIST SPHERE files
- Turtle beach SampleVision files
- Sounder & Soundtool (DOS) files
- Yamaha TX-16W sampler files
- SoundBlaster .VOC files
- Dialogic/OKI ADPCM files (.VOX)
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Microsoft .WAV files
- PCM, floating point
- u-law, A-law, MS ADPCM, IMA (DMI) ADPCM
- GSM
- RIFX (big endian)
- WavPack files (with optional libwavpack library)
- Psion (palmtop) A-law WVE files and Record voice notes
-
Maxis XA Audio files
- EA ADPCM (read support only, for now)
- Pseudo formats that allow direct playing/recording from most audio devices
- The “null” pseudo-file that reads and writes from/to nowhere
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- 全通: RBJ all-pass biquad IIR filter
- 带通: RBJ band-pass biquad IIR filter
- 带阻: RBJ band-reject biquad IIR filter
- 通带: SPKit resonator band-pass IIR filter
- 低音: Tone control: RBJ shelving biquad IIR filter
- 高音: Tone control: RBJ shelving biquad IIR filter
- 均衡: RBJ peaking equalisation biquad IIR filter
- FFTFIR滤波: FFT convolution FIR filter using given freq. response (W.I.P.)
- 高通: High-pass filter: Single pole or RBJ biquad IIR
- 希尔伯特滤波器: Hilbert transform filter (90 degrees phase shift)
- 低通: Low-pass filter: single pole or RBJ biquad IIR
- sinc滤波器: Sinc-windowed low/high-pass/band-pass/reject FIR
幅度变化: Signal level compression/expansion/limiting
对比化: Phase contrast volume enhancement
去直流: Apply or remove DC offset
淡入淡出: Apply a fade-in and/or fade-out to the audio
增益变化: Apply gain or attenuation; normalise/equalise/balance/headroom
响度控制: Gain control with ISO 226 loudness compensation
多带幅度变化: Multi-band compression/expansion/limiting
归一化: Normalise to 0dB (or other)
音量调节: Adjust audio volume
拉长: Pad (usually) the ends of the audio with silence
去除静音: Remove portions of silence from the audio
结合: Perform the equivalent of a cross-faded tape splice
裁剪: Cuts portions out of the audio
VAD: Voice activity detector
声道混音: Auto mix or duplicate to change number of channels
分声道: Divide sample values by those in the 1st channel (W.I.P.)
任意输出混音: Produce arbitrarily mixed output channels
翻转声道: Swap stereo channels
弯曲声调: Bend pitch at given times without changing tempo
变调: Adjust pitch (= key) without changing tempo
变速: Adjust pitch & tempo together
拉伸压缩: Adjust tempo without changing pitch (simple alg.)
变节拍: Adjust tempo without changing pitch (WSOLA alg.)
加入噪声: Add dither noise to increase quantisation SNR
重采样: Change audio sampling rate
去加重: ISO 908 CD de-emphasis (shelving) IIR filter
耳机增强: Process CD audio to best effect for headphone use
去噪声: Filter out noise from the audio
卡拉ok效应: Out Of Phase Stereo (or `Karaoke’) effect
RIAA: RIAA vinyl playback equalisation
噪声分析: Produce a DFT profile of the audio (use with noisered)
频谱分析: graph signal level vs. frequency & time (needs `libpng’)
状态分析: Enumerate audio peak & RMS levels, approx. freq., etc.
多声道状态: Multichannel aware `stat’
LADSPA : Apply LADSPA plug-in effects e.g. CMT (Computer Music Toolkit)
合成声音: Synthesise/modulate audio tones or noise signals
新文件: Create a new output file when an effects chain ends.
重试: Restart 1st effects chain when multiple chains exist.
滤波: 2nd-order IIR filter using externally provided coefficients
降采样: Reduce sample rate by discarding samples
fir滤波: FFT convolution FIR filter using externally provided coefficients
升采样: Increase sample rate by zero stuffing
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