The Windows Media Audio 9 codec (WMA 9) supports variable bit rate encoding (VBR), which enables even higher quality audio at smaller file sizes by automatically varying the encoding bit rate according to the complexity of the audio data. The resulting sound quality is 20 percent better than audio sampled with Windows Media Audio 8 at equivalent data rates. This codec samples audio at 44.1 or 48 kilohertz (kHz) using 16 bits, similar to the current CD standard, offering CD quality at data rates from 64 to 192 kilobits per second (Kbps). See Windows Media DRM for further information. This container can optionally support digital rights management (DRM) using a combination of elliptic curve cryptography key exchange, DES block cipher, a custom block cipher, RC4 stream cipher and the SHA-1 hashing function. Metadata may include song name, track number, artist name, and also audio normalization values. The ASF container format specifies how metadata about the file is to be encoded, similar to the ID3 tags used by MP3 files. These codecs are technically distinct and mutually incompatible. WMA Voice, targeted at voice content, applies compression using a range of low bit rates.Ī WMA file is in most circumstances encapsulated, or contained, in the Advanced Systems Format (ASF) container format, featuring a single audio track in one of following codecs: WMA, WMA Pro, WMA Lossless, or WMA Voice. A lossless codec, WMA Lossless, compresses audio data without loss of audio fidelity. WMA Pro, a newer and more advanced codec, supports multichannel and high resolution audio. The original WMA codec, known simply as WMA, was conceived as a competitor to the popular MP3 and RealAudio codecs. It is a proprietary technology that forms part of the Windows Media framework. The name can be used to refer to its audio file format or its audio codecs. Windows Media Audio (WMA) is an audio data compression technology developed by Microsoft.
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