COMPARISON

GENERAL COMPARISON
Of G.729, G.723 and G.729A and there implementation in applications.

Comparing the overall performance of G.723.1 at 6.3kbit/s and G.729 there is no great deal of difference. The real differences are in bit rate and delay. So if we add one additional frame for the transmission delay the one-way total coder delay become 97.5ms for G.723.1 versus 35ms for G.729. Both share the distinction of being the first ITU speech coder recommendations to be specified in bit-exact fixed-point ANSI C code (…There exist different defined bit-input vectors producing determined bit-output vectors which can be proofed during simulation…).

The quality judgement is based on their relative scores compared to 32kbit/s G.726. No marked differences have been observed for tandems, noisy backgrounds, input level, or speaker dependency. G.729 is marginally better in several of these cases. Therefore their selection is only based on the decision of bit rate, complexity and delay.

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