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File extension.SPX
CategoryAudio File
DescriptionSPX (Speex) is an open-source CELP-based speech codec format intended for compressing speech at bitrates between 2 and 44 kbps. The .SPX extension has a number of advanced features, which ensure noise- and echo reduction, stereo encoding, integration of several sample rates within a particular bitstream, etc. Although SPX is patent-free, it is not widely supported by popular audio players. For this reason, most users prefer to convert SPX files to WAV or MP3.
Associated programsVLC media player
FFMpeg
Developed byXiph.Org Foundation, Jean-Marc Valin
MIME typeaudio/x-speex
audio/speex
Useful linksMore detailed information on SPX files

File extension.MP3
CategoryAudio File
DescriptionMP3 is the most popular audio file type based on MPEG-1 Layer III compression. Its lossy algorithm was developed in 1991. MP3 codes the sound almost with the same quality, as CD (16-bit stereo), providing compression in size 1 to 10 from the original WAF or AIFF tracks. The quality of MP3 seriously depends on the bitrate. It can be 128 - 256 kbps. Higher bitrates are also supported, but they seriously increase the file size. It is supported by all modern hard- and software players.
Associated programsRealOne
WinAmp
Windows Media Player
iTunes
Developed byFraunhofer Institute
MIME typeaudio/mpeg
audio/MPA
audio/mpa-robust
Useful linksMore detailed information on MP3 files

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