iLBC

iLBC

C54x , C55x , C64x , C64+

LOW BIT-RATE VOCODER

iLBC is a royalty-free codec for Voice over IP (VoIP) networks. iLBC delivers speech quality better than G.729A and equal to G.729E, while offering significantly better quality over congested networks with packet loss.

iLBC is the first codec ever to be standardized by the IETF (RFC3951 and RFC3952) and is designated by CableLabs as a mandatory component of PacketCable voice-over-cable telephony systems.

Other standard low bit rate codecs make use of dependencies between speech frames, resulting in error proliferation when packets are lost or delayed. In contrast, iLBC encoded speech frames are independent. This unique technology gives iLBC robustness against packet loss and delay.

Data sheet: .pdf

FEATURES

The only codec ever to be standardized by the IETF
Royalty-free with speech quality better than G.729A and G.723.1.
Better packet loss robustness compared to other low-bit rate codecs, including G.729A, G.729E, G.723.1 and G.728
iLBC supports multiple frame sizes giving increased flexibility to meet the needs of different applications and/or VoIP equipment
iLBC delivers the same basic quality as G.729E and exceeds G.729E under packet loss conditions

AVAILABILITY

iLBC is available on Texas Instruments’ TMS320C5000™ and C6000™DSP Platforms

C54x™DSP, C55x™DSP, C64x™DSP, and C64x+™DSP Generations

SPECIFICATIONS

iLBC C54x

All Memory usage is given in units of 16-bit word.

Codec mode	MIPS	Program Memory	Data Memory	Per-Channel Data Memory
20 ms	15.65	15446	4560	1357
30 ms	17.95	15446	4560	1357

iLBC C55x

All Memory usage is given in units of byte.

Codec mode	MIPS	Program Memory	Data Memory	Per-Channel Data Memory
20 ms	11.12	29350	6848	1359
30 ms	12.65	29350	6848	1359

iLBC C64x

All Memory usage is given in units of byte.

Codec mode	MIPS	Program Memory	Data Memory	Per-Channel Data Memory
20 ms	7.49	67168	9188	2736
30 ms	8.538	67168	9188	2736

iLBC C64x +

All Memory usage is given in units of 16-bit word.

Codec mode	MIPS	Program Memory	Data Memory	Per-Channel Data Memory
20 ms	7.218	55031	9188	2736
30 ms	8.172	55031	9188	2736

FUNCTION

iLBCFIX_GIPS_encoderinit(): initialize an iLBC encode channel
iLBCFIX_GIPS_decoderinit(): initialize an iLBC decode channel
iLBCFIX_GIPS_encode(): perform iLBC encode

iLBCFIX_GIPS_decode(): perform iLBC decode

APPLICATIONS

iLBC is an excellent choice for providers/applications with restricted bandwidth requirements. It is suitable for VOIP applications, streaming audio, and messaging.