The Internet Low bit rate codec, or iLBC, is royalty-free language codec, which is used mainly with VoIP. The codec is appropriate for narrow band speech transmission and works with 30-ms or 20-ms-Datenframes. The bit rate amounts to 13.3 kbit/s at 30-ms-Frames (400 bits per block) or 15.2 kbit/s with 20-ms-Frames (304 bits per block). The iLBC codec makes relatively good language quality possible with lost gone Datenframes, what can be caused by lost or retarded IP packages. Skype uses a variation of iLBC.

iLBC is specified in RFC 3951.

The iLBC signal is processed by a scanning rate by 8 kHz/16 bits and uses an block-independent linear Predictive Coding (LPC) - algorithm with controlled reaction to package loss similarly the pulse-code modulation (PCM) with pack Loss Concealment, as for example ITU-T G.711 (which with a firm bit rate of 64 kbit/s works).

Characteristics

• Bit rate 13.33 kbit/s (, packages 399 bits in 50 bytes) for Frames of the size of 30 ms and 15.2 kbit/s (, packages 303 bits in 38 bytes) for Frames of the size of 20 ms
• Basic quality more highly than G.729A, high robustness in relation to package loss
• Computation complexity within the range of G.729A
• royalty-free

Web left

• iLBC homepage
• voip-info.org: iLBC codecs

Articles in category "ILBC"

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Related Websites

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• iLBC - voip-info.org
  iLBC (internet Low Bitrate Codec) is a FREE speech codec suitable for robust ... The iLBC codec enables graceful speech quality degradation in the case of ...


• iLBCfreeware.org Project Homepage
  iLBC freeware Project. ... iLBC (internet Low Bitrate Codec) is a FREE speech codec suitable for robust voice communication over IP. ...


• iLBCfreeware.org Software
  The iLBC ANSI C Source code is available through IETF RFC page, ... The following package can be used to verify that your compiled iLBC code works correctly ...