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Internet Low Bitrate Codec

Internet Low Bitrate Codec (iLBC) is a royalty-free narrowband speech audio coding format and an open-source reference implementation (codec), developed by Global IP Solutions (GIPS) formerly Global IP Sound. It was formerly freeware with limitations on commercial use, but since 2011 it is available under a free software/open source license as a part of the open source WebRTC project. It is suitable for VoIP applications, streaming audio, archival and messaging. The algorithm is a version of block-independent linear predictive coding, with the choice of data frame lengths of 20 and 30 milliseconds. The encoded blocks have to be encapsulated in a suitable protocol for transport, usually the Real-time Transport Protocol (RTP).

Parameters and features
• Sampling frequency 8 kHz/16 bit (160 samples for 20 ms frames, 240 samples for 30 ms frames) • Controlled response to packet loss, delay and jitter • Fixed bitrate (15.2 kbit/s for 20 ms frames, 13.33 kbit/s for 30 ms frames) • Fixed frame size (304 bits per block for 20 ms frames, 400 bits per block for 30 ms frames) • Robustness similar to pulse-code modulation (PCM) with packet loss concealment, like the ITU-T G.711 • CPU load similar to G.729A, with higher basic quality and better response to packet loss • Royalty-free • Since 2011 it is available under an open source (3-clause BSD license) license as a part of the open source WebRTC project.) • PSQM testing under ideal conditions yields mean opinion scores of 4.14 for iLBC (15.2 kbit/s), compared to 4.3 for G.711 (μ-law) ==See also==
Source: Wikipedia ↗
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