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Welcome to the home of SoX, the Swiss Army knife of sound processing programs.SoX is a cross-platform (Windows, Linux, MacOS X, etc.) command line utility that can convert various formats of computer audio files in to other formats. It can also apply various effects to these sound files, and, as an added bonus, SoX can play and record audio files on most platforms. DownloadSoX downloads for Source code, Win32 binaries in ZIP archive, Win32 Installer, and Mac OS X binaries can be found on Sourceforge's File Release System.Some third-party pre-built (usually older) versions of SoX are available via the links page.The current release handles the following audio file formats: 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) 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 The audio effects/tools included in this release are as follows: Tone/filter effects allpass: RBJ all-pass biquad IIR filter bandpass: RBJ band-pass biquad IIR filter bandreject: RBJ band-reject biquad IIR filter band: SPKit resonator band-pass IIR filter bass: Tone control: RBJ shelving biquad IIR filter equalizer: RBJ peaking equalisation biquad IIR filter firfit+: FFT convolution FIR filter using given freq. response (W.I.P.) highpass: High-pass filter: Single pole or RBJ biquad IIR hilbert: Hilbert transform filter (90 degrees phase shift) lowpass: Low-pass filter: single pole or RBJ biquad IIR sinc: Sinc-windowed low/high-pass/band-pass/reject FIR treble: Tone control: RBJ shelving biquad IIR filter Production effects chorus: Make a single instrument sound like many delay: Delay one or more channels echo: Add an echo echos: Add a sequence of echos flanger: Stereo flanger overdrive: Non-linear distortion phaser: Phase shifter repeat: Loop the audio a number of times reverb: Add reverberation reverse: Reverse the audio (to search for Satanic messages ;-) tremolo: Sinusoidal volume modulation Volume/level effects compand: Signal level compression/expansion/limiting contrast: Phase contrast volume enhancement dcshift: Apply or remove DC offset fade: Apply a fade-in and/or fade-out to the audio gain: Apply gain or attenuation; normalise/equalise/balance/headroom loudness: Gain control with ISO 226 loudness compensation mcompand: Multi-band compression/expansion/limiting norm: Normalise to 0dB (or other) vol: Adjust audio volume Editing effects pad: Pad (usually) the ends of the audio with silence silence: Remove portions of silence from the audio splice: Perform the equivalent of a cross-faded tape splice trim: Cuts portions out of the audio vad: Voice activity detector Mixing effects channels: Auto mix or duplicate to change number of channels divide+: Divide sample values by those in the 1st channel (W.I.P.) remix: Produce arbitrarily mixed output channels swap: Swap stereo channels Pitch/tempo effects bend: Bend pitch at given times without changing tempo pitch: Adjust pitch (= key) without changing tempo speed: Adjust pitch & tempo together stretch: Adjust tempo without changing pitch (simple alg.) tempo: Adjust tempo without changing pitch (WSOLA alg.) Mastering effects dither: Add dither noise to increase quantisation SNR rate: Change audio sampling rate Specialised filters/mixers deemph: ISO 908 CD de-emphasis (shelving) IIR filter earwax: Process CD audio to best effect for headphone use noisered: Filter out noise from the audio oops: Out Of Phase Stereo (or `Karaoke') effect riaa: RIAA vinyl playback equalisation Analysis `effects' noiseprof: Produce a DFT profile of the audio (use with noisered) spectrogram: graph signal level vs. frequency & time (needs `libpng') stat: Enumerate audio peak & RMS levels, approx. freq., etc. stats: Multichannel aware `stat' Miscellaneous effects ladspa: Apply LADSPA plug-in effects e.g. CMT (Computer Music Toolkit) synth: Synthesise/modulate audio tones or noise signals newfile: Create a new output file when an effects chain ends. restart: Restart 1st effects chain when multiple chains exist. Low-level signal processing effects biquad: 2nd-order IIR filter using externally provided coefficients downsample: Reduce sample rate by discarding samples fir: FFT convolution FIR filter using externally provided coefficients upsample: Increase sample rate by zero stuffing + Experimental or incomplete effect; may change in future. Multiple audio files can be combined (and then further processed with effects) using any one of the following combiner methods: concatenate mix merge: E.g. two mono files to one stereo file sequence: For playing multiple audio files/streams
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