Encoding an uncompressed minute of absolute silence produces a file of the same size as encoding an uncompressed minute of music. Uncompressed audio formats encode both sound and silence with the same number of bits per unit of time. The original, uncompressed data can be recreated from the compressed version. Stand-alone, file based, multi-track recorders from AETA, Sound Devices, Zaxcom, HHB Communications Ltd, Fostex, Nagra, Aaton, and TASCAM all use BWF as their preferred format.Ī lossless compressed audio format stores data in less space without losing any information. BWF files include a standardized timestamp reference which allows for easy synchronization with a separate picture element. This is the primary recording format used in many professional audio workstations in the television and film industry. See European Broadcasting Union: Specification of the Broadcast Wave Format (EBU Technical document 3285, July 1997). Among other enhancements, BWF allows more robust metadata to be stored in the file. Since WAV and AIFF are widely supported and can store LPCM, they are suitable file formats for storing and archiving an original recording.īWF (Broadcast Wave Format) is a standard audio format created by the European Broadcasting Union as a successor to WAV. WAV and AIFF are designed to store a wide variety of audio formats, lossless and lossy they just add a small, metadata-containing header before the audio data to declare the format of the audio data, such as LPCM with a particular sample rate, bit depth, endianness and number of channels. The Audio Interchange File Format (AIFF) format is based on the Interchange File Format (IFF), and the WAV format is based on the similar Resource Interchange File Format (RIFF). Although LPCM can be stored on a computer as a raw audio format, it is usually stored in a. One major uncompressed audio format, LPCM, is the same variety of PCM as used in Compact Disc Digital Audio and is the format most commonly accepted by low level audio APIs and D/A converter hardware. See also: Raw audio format and Uncompressed video

m4a), MPEG-4 SLS, MPEG-4 ALS, MPEG-4 DST, Windows Media Audio Lossless (WMA Lossless), and Shorten (SHN).įormats with lossy compression, such as Opus, MP3, Vorbis, Musepack, AAC, ATRAC and Windows Media Audio Lossy (WMA lossy). wv), TTA, ATRAC Advanced Lossless, ALAC (filename extension. Uncompressed audio formats, such as WAV, AIFF, AU or raw header-less PCM įormats with lossless compression, such as FLAC, Monkey's Audio (filename extension. There are three major groups of audio file formats: Although most audio file formats support only one type of audio coding data (created with an audio coder), a multimedia container format (as Matroska or AVI) may support multiple types of audio and video data. A codec performs the encoding and decoding of the raw audio data while this encoded data is (usually) stored in a container file. It is important to distinguish between the audio coding format, the container containing the raw audio data, and an audio codec. The data can be a raw bitstream in an audio coding format, but it is usually embedded in a container format or an audio data format with defined storage layer.Format types The bit layout of the audio data (excluding metadata) is called the audio coding format and can be uncompressed, or compressed to reduce the file size, often using lossy compression.

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