It can automatically detect sections of an audio track containing both voice and music and use the standard WMA compression algorithm instead. The first and only version of the codec is WMA 9 Voice. Microsoft claims that audio encoded with WMA sounds better than MP3 at the same bit rate; Microsoft also claims that audio encoded with WMA at lower bit rates sound better than MP3 at higher bit rates.

Microsoft’s claims of WMA sound quality have frequently drawn complaints. Both MP3 and WMA encoders have undergone active development and improvement for many years, so their relative quality may change over time.

The Rockbox project further extended this codec to be suitable for embedded cores, allowing playback on portable MP3 players and cell phones running open source software. Not all Android devices have native support for WMA files because the core Android platform doesn’t support this format, but third-party software that supports it also exists.

Open source players like VLC media player can also do some encoding. Music Unlimited , and Virgin Digital. From Wikipedia, the free encyclopedia. Audio data compression technology. This article is about audio encoding and decoding software. For the container file format, see. Main article: Advanced Systems Format.

Microsoft PressPass. Archived from the original on Retrieved The Register. International Narcotics Control Board. Archived from the original DOC on Microsoft Research. Microsoft TechNet. Microsoft MSDN. Archived from the original on 17 April Retrieved 30 April Apple Lossless Audio Codec. MacOS Forge. October 27, Archived from the original on June 15, Retrieved October 29, Ars Technica.

Archived from the original on October 29, The H. Archived from the original on 15 May CBS Interactive. Archived from the original on 24 April Retrieved 5 April Multimedia compression and container formats. RTP Ogg. Comparison of audio coding formats Comparison of video codecs List of codecs. See Compression methods for techniques and Compression software for codecs. Authority control: National libraries France data.

Categories : Audio codecs Audio file formats Microsoft proprietary codecs Windows audio. Hidden categories: CS1 maint: url-status CS1 maint: archived copy as title Webarchive template wayback links All articles with dead external links Articles with dead external links from August Articles with permanently dead external links Articles with short description Short description matches Wikidata All articles with unsourced statements Articles with unsourced statements from April Articles with unsourced statements from May Articles with dead external links from August Articles with unsourced statements from January Articles with unsourced statements from March Articles with BNF identifiers.

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Windows Media Audio WMA is a series of audio codecs and their corresponding audio coding formats developed by Microsoft. It is a proprietary technology that forms part of the Windows Media framework. WMA consists of four distinct codecs. All versions of WMA released since version 9. Metadata may include song name, track number, artist name, and also audio normalization values. 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.

These formats are implemented differently from one another, such that they are technically distinct and mutually incompatible; that is to say, a device or software compatible with one sub-format does not therefore automatically support any of the other codecs.

Each codec is further explained below. The colloquial usage of the term WMA , especially in marketing materials and device specifications, usually refers to this codec only.

The first version of the codec released in is regarded as WMA 1. In the same year, the bit stream syntax, or compression algorithm , was altered in minor ways and became WMA 2. Audio signals that are deemed to be imperceptible to the human ear are encoded with reduced resolution during the compression process. WMA can encode audio signals sampled at up to 48 kHz with up to two discrete channels stereo.

The bit stream of WMA is composed of superframes, each containing 1 or more frames of samples. If the bit reservoir is not used, a frame is equal to a superframe. Each frame contains several blocks, which are , , , , or samples long after being transformed into the frequency domain via the MDCT. In the frequency domain, masking for the transformed samples is determined, and then used to requantize the samples.

Finally, the floating point samples are decomposed into coefficient and exponent parts and independently huffman coded. Given their common design goals, the three formats ended up making similar design choices. All three are pure transform codecs. However, quantization and stereo coding is handled differently in each codec. WMA Pro extends this by adding a 6th block size used at Certified PlaysForSure devices, as well as a large number of uncertified devices, ranging from portable hand-held music players to set-top DVD players , support the playback of WMA files.

Most PlaysForSure-certified online stores distribute content using this codec only. It retains most of the same general coding features, but also features improved entropy coding and quantization strategies as well as more efficient stereo coding. Notably, many of the WMA standard’s low bitrate features have been removed, as the core codec is designed for efficient coding at most bitrates.

It supports bit and bit sample bit depth, sampling rates up to 96 kHz, and up to eight discrete channels 7. The codec’s bit stream syntax was frozen at the first version, WMA 9 Pro.

A WMA 10 Pro file compressed with frequency interpolation mode comprises a WMA 9 Pro track encoded at half the original sampling rate, which is then restored using a new compression algorithm. Some notable exceptions to this are the Microsoft Zune limited to stereo , [28] Xbox , [29] Windows Mobile -powered devices with Windows Media Player 10 Mobile, [30] newer Toshiba Gigabeat and Motorola devices, [31] [32] and devices running recent versions of the Rockbox alternative firmware. In the absence of the appropriate audio hardware, WMA Pro can automatically downmix multichannel audio to stereo or mono , and bit resolution to bit during playback.

The result is a bit-for-bit duplicate of the original audio file; in other words, the audio quality on the CD will be the same as the file when played back. WMA Lossless uses the same. The format has never been publicly documented, although an open-source decoder has been reverse-engineered for non-Microsoft platforms by the libav and ffmpeg projects. Designed for archival purposes, [40] it compresses audio signals without loss of quality from the original using VBR. When decompressed, the audio signal is an exact replica of the original.

The first version of the codec, WMA 9 Lossless, and its revisions support up to 96 kHz, bit audio for up to 6 discrete channels 5. The typical compression ratio for music varies between 1.

The Logitech Squeezebox Touch now supports the format natively despite previously only supporting it via transcoding. Only bit WMA files can be successfully decoded by ffmpeg as of June 20, Designed for low-bandwidth, voice playback applications, [48] it employs low-pass and high-pass filtering of sound outside the human speech frequency range to achieve higher compression efficiency than WMA.

It can automatically detect sections of an audio track containing both voice and music and use the standard WMA compression algorithm instead. The first and only version of the codec is WMA 9 Voice. Microsoft claims that audio encoded with WMA sounds better than MP3 at the same bit rate; Microsoft also claims that audio encoded with WMA at lower bit rates sound better than MP3 at higher bit rates. Microsoft’s claims of WMA sound quality have frequently drawn complaints.

Both MP3 and WMA encoders have undergone active development and improvement for many years, so their relative quality may change over time. The Rockbox project further extended this codec to be suitable for embedded cores, allowing playback on portable MP3 players and cell phones running open source software.

Not all Android devices have native support for WMA files because the core Android platform doesn’t support this format, but third-party software that supports it also exists.

Open source players like VLC media player can also do some encoding. Music Unlimited , and Virgin Digital. From Wikipedia, the free encyclopedia. Audio data compression technology. This article is about audio encoding and decoding software. For the container file format, see. Main article: Advanced Systems Format. Microsoft PressPass. Archived from the original on Retrieved The Register. International Narcotics Control Board. Archived from the original DOC on Microsoft Research.

Microsoft TechNet. Microsoft MSDN. Archived from the original on 17 April Retrieved 30 April Apple Lossless Audio Codec. MacOS Forge. October 27, Archived from the original on June 15, Retrieved October 29, Ars Technica. Archived from the original on October 29, The H. Archived from the original on 15 May CBS Interactive. Archived from the original on 24 April Retrieved 5 April Multimedia compression and container formats.

RTP Ogg. Comparison of audio coding formats Comparison of video codecs List of codecs. See Compression methods for techniques and Compression software for codecs. Authority control: National libraries France data. Categories : Audio codecs Audio file formats Microsoft proprietary codecs Windows audio.

Hidden categories: CS1 maint: url-status CS1 maint: archived copy as title Webarchive template wayback links All articles with dead external links Articles with dead external links from August Articles with permanently dead external links Articles with short description Short description matches Wikidata All articles with unsourced statements Articles with unsourced statements from April Articles with unsourced statements from May Articles with dead external links from August Articles with unsourced statements from January Articles with unsourced statements from March Articles with BNF identifiers.

Namespaces Article Talk. Views Read Edit View history. Help Learn to edit Community portal Recent changes Upload file. Download as PDF Printable version. August 17, ; 22 years ago [1]. France data.