Sunday, July 20, 2014

Audacity®

Audacity is a free, easy-to-use, multi-track audio editor and recorder for Windows, Mac OS X, GNU/Linux and other operating systems. The interface is translated into many languages.

Audacity running on Linux

Audacity running on Mac OS

Audacity running on Windows



Change Pitch effect

Change Tempo effect

Noise Removal effect

Recording with Audacity


Features
This is a list of features in Audacity, the free, open source, cross-platform audio editor. For full information on how to use these features, go to the help pages.

Recording

Audacity can record live audio through a microphone or mixer, or digitize recordings from cassette tapes, records or minidiscs. With some sound cards, and on any Windows Vista, Windows 7 or Windows 8 machine, Audacity can also capture streaming audio.
  • Device Toolbar manages multiple input and output devices.
  • Level meters can monitor volume levels before, during and after recording. Clipping can be displayed in the waveform or in a label track.
  • Record from microphone, line input, USB/Firewire devices and others.
  • Record computer playback on Windows Vista and later by choosing "Windows WASAPI" host in Device Toolbar then a "loopback" input.
  • Timer Record and Sound Activated Recording features.
  • Dub over existing tracks to create multi-track recordings.
  • Record at very low latencies on supported devices on Linux by using Audacity with JACK.
  • Record at sample rates up to 192,000 Hz (subject to appropriate hardware and host selection). Up to 384,000 Hz is supported for appropriate high-resolution devices on Mac OS X and Linux.
  • Record at 24-bit depth on Windows (using Windows WASAPI host), Mac OS X or Linux (using ALSA or JACK host).
  • Record multiple channels at once (subject to appropriate hardware).

Import and Export

Import sound files, edit them, and combine them with other files or new recordings. Export your recordings in many different file formats, including multiple files at once.
  • Import and export WAV, AIFF, AU, FLAC and Ogg Vorbis files.
  • Fast "On-Demand" import of WAV or AIFF files (letting you start work with the files almost immediately) if read directly from source.
  • Import and export all formats supported by libsndfile such as GSM 6.10, 32-bit and 64-bit float WAV and U/A-Law.
  • Import MPEG audio (including MP2 and MP3 files) using libmad.
  • Import raw (headerless) audio files using the "Import Raw" command.
  • Create WAV or AIFF files suitable for burning to audio CD.
  • Export MP3 files with the optional LAME encoder library.
  • Import and export AC3, M4A/M4R (AAC) and WMA with the optional FFmpeg library (this also supports import of audio from video files).

Sound Quality

  • Supports 16-bit, 24-bit and 32-bit (floating point) samples (the latter preserves samples in excess of full scale).
  • Sample rates and formats are converted using high-quality resampling and dithering.
  • Tracks with different sample rates or formats are converted automatically in real time.

Editing

  • Easy editing with Cut, Copy, Paste and Delete.
  • Unlimited sequential Undo (and Redo) to go back any number of steps.
  • Edit and mix large numbers of tracks.
  • Multiple clips are allowed per track.
  • Label tracks with selectable Sync-Lock Tracks feature for keeping tracks and labels synchronized.
  • Draw Tool to alter individual sample points.
  • Envelope Tool to fade the volume up or down smoothly.
  • Automatic Crash Recovery in the event of abnormal program termination.

Accessibility

Effects

  • Change the pitch without altering the tempo (or vice-versa).
  • Remove static, hiss, hum or other constant background noises.
  • Alter frequencies with Equalization, Bass and Treble, High/Low Pass and Notch Filter effects.
  • Adjust volume with Compressor, Amplify, Normalize, Fade In/Fade Out and Adjustable Fade effects.
  • Remove Vocals from suitable stereo tracks.
  • Create voice-overs for podcasts or DJ sets using Auto Duck effect.
  • Other built-in effects include:
    • Echo
    • Paulstretch (extreme stretch)
    • Phaser
    • Reverb
    • Reverse
    • Truncate Silence
    • Wahwah
  • Run "Chains" of effects on a project or multiple files in Batch Processing mode.

Plug-ins

Analysis

  • Spectrogram view modes for visualizing frequencies.
  • "Plot Spectrum" command for detailed frequency analysis.
  • "Sample Data Export" for exporting a file containing amplitude values for each sample in the selection.
  • Contrast Analysis for analyzing average rms volume differences between foreground speech and background music.
  • Support for adding VAMP analysis plug-ins.

Free and Cross-Platform

Download

Audacity® for Windows®

(Windows 2000/XP/Vista/Windows 7/Windows 8)

Recommended Downloads - Latest Version of Audacity

  • Audacity 2.0.5 installer (.exe file, 21.2 MB, including help files) for Windows 2000/XP/Vista/Windows 7/Windows 8
  • Audacity 2.0.5 zip file (8.2 MB) for Windows 2000/XP/Vista/Windows 7/Windows 8 - Use this if you want a smaller download (without help files), or cannot run the installer because of restricted permissions.
Known Issue: On a very few machines, launching Audacity may give a configuration error. This is a Microsoft issue which can be solved by installing the appropriate 32-bit or 64-bit Microsoft Redistributable Package.

Optional Downloads

Plug-ins and Libraries

Alternative Download Links

  • If you have trouble with your download, or need an older version of Audacity, try:
    • SourceForge: View older versions by clicking to enter the required folder under "Name".
    • Google Code: Click on the headings to sort the list.

Audacity Nightly Builds

  • For advanced users, Nightly Builds for Windows 2000/XP/Vista/Windows 7/Windows 8 are available for testing purposes. "Nightly Builds" are Alpha builds from latest development code. Your help in testing and reporting bugs in these builds is invaluable. Note: These builds will definitely be less reliable than official releases. They should not be used as your production version of Audacity.

System Requirements

Read about Audacity on Windows Vista, Windows 7 and Windows 8. Windows 95 and NT are not supported.
The values in the "Recommended RAM/processor speed" column below are for tasks like recording for an hour, or editing three 20-minute tracks simultaneously. The values in the "Minimum RAM/processor speed" column will be fine for smaller/shorter tasks, especially if unnecessary programs are closed.
Windows versionRecommended RAM/
processor speed		Minimum RAM/
processor speed
Windows 7 (64-bit)/ Windows 8 (64-bit)4 GB / 2 GHz2 GB / 1 GHz
Windows Vista (Home Premium/Business/Ultimate) (32- or 64-bit)/
Windows 7 32-bit (except Windows 7 Starter) / Windows 8 (32-bit)		4 GB / 2 GHz1 GB / 1 GHz
Windows Vista (Home Basic) (32- or 64-bit)/Windows 7 Starter2 GB / 1 GHz512 MB / 1 GHz
Windows 2000/ XP (32- or 64-bit)512 MB/1 GHz128 MB/300 MHz

Generally, Audacity works best on computers meeting more than the minimum requirements in the table above. Where Audacity is to be used for lengthy multi-track projects, we recommend using Windows XP, Vista, Windows 7 or Windows 8 running on machines of substantially higher specification than the minimum stated above.

Audacity® for Mac®

(Universal Binary for Mac OS X 10.4 or later)

Recommended Downloads - Latest Version of Audacity

  • Audacity 2.0.5 (.dmg file, 29.3 MB, including help files) for OS X 10.4 or later (Universal Binary)
  • Audacity 2.0.5 zip file (13.3 MB) for OS X 10.4 or later (Universal Binary) - Use this if you want a smaller download (without help files).
Installation instructions (.dmg files):
  1. Double-click the downloaded .dmg to mount it.
  2. Copy the "Audacity" folder from the newly mounted .dmg to /Applications (or any other location of your choosing).
  3. Eject the .dmg at bottom left of Finder, then launch Audacity.app from the "Audacity" folder that you copied.

Optional Downloads

Plug-ins and Libraries

Alternative Download Links

  • If you have trouble with your download, or need an older version of Audacity, try:
    • SourceForge: View older versions by clicking to enter the required folder under "Name".
    • Google Code: Click on the headings to sort the list.

Audacity Nightly Builds

  • For advanced users, Nightly Builds for OS X 10.4 or later (Universal Binary) are available for testing purposes. "Nightly Builds" are Alpha builds from latest development code. Your help in testing and reporting bugs in these builds is invaluable. Note: These builds will definitely be less reliable than official releases. They should not be used as your production version of Audacity.

System Requirements


Audacity runs best with at least 1 GB RAM and a 1 GHz processor (2 GB RAM/2 GHz on OS X 10.7 or later).
Where Audacity is to be used for lengthy multi-track projects, we recommend a minimum of 2 GB RAM and 2 GHz processor (4 GB RAM on OS X 10.7 or later).

Audacity® for GNU/Linux®

(source code)
Installation packages for Audacity on GNU/Linux and other Unix-like systems are provided by individual distributions. The following distributions maintain regularly updated Audacity packages:
Otherwise, we recommend either searching the web pages of your distribution for the latest information, or compiling Audacity yourself from source code.

System Requirements

We recommend using the latest version of GNU/Linux from your distribution that is compatible with your hardware specifications. Audacity will run best with at least 64 MB RAM and a 300 MHz processor.

Legacy Downloads

Further Information

  • You can also obtain Audacity as a CD image file or purchasable CD. Note that these are often not the latest version of Audacity.
  • To build Audacity yourself, download the source code.
  • You may copy, distribute, modify and/or resell Audacity, under the terms of the GNU GPL.

source: http://audacity.sourceforge.net




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