G.723.1 is a dual rate speech coder standard from International Telecommunication Union–Telecommunication standardization sector (ITU-T), for compressing the toll quality speech (8000 samples/second). The typical applications of this speech coder are in telephony over packet networks, like Voice-over-Internet-Protocol (VoIP). This speech coder is extensively used for coding the speech component in the video conferencing applications and is a part of the overall H.324 family of standards.

This coder has two bit rates, 5.3 and 6.3 Kbps. Both bit rates share the same short-term analysis techniques for processing the speech. For long-term analysis of speech, the algorithms used are different. For 5.3 Kbps coder, Algebraic Code Excited Linear Prediction (ACELP) principles are used where as in 6.3 Kbps coder, Multi Pulse-Maximum Likelihood Quantization (MP-MLQ) techniques are used.

The coder works on a frame of 240 speech samples (30 msec). Besides, there is a look ahead of 60 samples (7.5 msec). So the total algorithmic delay for the coder is 37.5 msec.

Currently Encore’s G.711 is available on TI’s TMS320C64x (c64x), TMS320C62x (c62x), TMS320C54x (c54x), TMS320C55x (c55x), Coldfire (MCF52xx, MCF53xx, MCF522xx), PowerPC, ARM platforms.

G.723.1 Product Brief - Download PDF

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