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SPEEXSpeech Codec
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Finally, a wider range of audio file formats, including WAV, OPUS, and Speex, are supported.
Supports almost all industry standard codec types - G.711 (mu-Law and A-Law), G.722, G.729, G.726, GSM, AMR, EVRC, SMV, iLBC, SPEEX, and more.
- Supports G.711[micro]/a, G.722 (HD-audio), G.726-32, GSM, iLBC, Opus (HD-audio), and Speex codecs
Kanthamanon, Perceptual evaluation of speech quality measurement on speex codec VoIP with tonal language Thai", in Advances in Information Technology, Springer Berlin Heidelberg, 2012, pp.
present a TDMA- (time division multiple access-) based MAC protocol LiT [10] and implement the MAC on an 802.15.4 platform Tmote; the evaluation of LiT shows quick flow setup, low packet delay, and essentiality for real-time applications; however, the speech coder chosen is G.723.1, and the coding bit is 6.3 kbps, but the speech codec power consumption is not considered; in 2012, a Lo3 system based on LiT was reported [15], and it showed that such system bodes well with cost and power constraints in rural regions; the audio codec is SPEEX [16] with data rate of 5.9 Kbps, and the expected lifetime is 5 days.
If you have a Premium account, you even can upload your own audio tracks in several formats, including AAC, FLAC, MP3, MPEG4 audio, WAV, Speex, and Ogg.
Some of the leading codecs right now are G.722, G.722.2 (also called Advanced Multirate-Wideband, or AMR-WB), RT Audio, Speex, EVRC, MPEG-AAC, and SILK (which is used by Skype).
Both Adobe's Speex audio and H.264 video codec implementations offer error recovery, according to the company, rendering the need for TCP in real-time communications mostly irrelevant.