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===Windows Media Audio Voice=== '''Windows Media Audio Voice''' (WMA Voice) is a lossy audio codec that competes with [[Speex]] (used in Microsoft's own [[Xbox Live]] online service<ref>Ralph Giles of [[Xiph.org]] explained that Xbox Live uses Speex for voice compression in the June 6, 2005 interview on [[LugRadio]]: {{cite web |url=http://www.lugradio.org/episodes/29 |title=Linux radio show - LugRadio |access-date=2007-10-10 |url-status=live |archive-url=https://web.archive.org/web/20071014210527/http://lugradio.org/episodes/29 |archive-date=2007-10-14 }}</ref>), [[ACELP]], and other codecs. Designed for low-bandwidth, voice playback applications,<ref name="Windows Media Audio 9 Voice">{{cite web |url=http://www.microsoft.com/windows/windowsmedia/forpros/codecs/audio.aspx#WindowsMediaAudio9Voice |title=Windows Media Audio Codecs: Windows Media Audio 9 Voice |publisher=Microsoft |access-date=2007-08-16 |url-status=live |archive-url=https://web.archive.org/web/20070901193343/http://www.microsoft.com/windows/windowsmedia/forpros/codecs/audio.aspx#WindowsMediaAudio9Voice |archive-date=2007-09-01 }}</ref> 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.<ref name="wmav9series"/> WMA Voice supports up to 22.05 kHz for a single channel (mono) only.<ref name="Windows Media Audio 9 Voice"/> Encoding is limited to [[constant bit rate]] (CBR) and up to 20 kbit/s. The first and only version of the codec is WMA 9 Voice. Windows Mobile-powered devices with Windows Media Player 10 Mobile have native support for WMA 9 Voice playback.<ref name="winmobilefaq"/> In addition, [[BBC World Service]] has employed WMA Voice for its [[Internet radio]] streaming service.<ref name="roku">{{cite web|url=http://www.rokulabs.com/products_soundbridge_internet.php|title=Roku - SoundBridge Internet Radio|url-status=dead|archive-url=https://web.archive.org/web/20070816182910/http://www.rokulabs.com/products_soundbridge_internet.php|archive-date=2007-08-16|access-date=2007-08-08}}</ref>
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