17. The speech recognition system of claim 6 , wherein the Viterbi decoder of the pronunciation variation channel unit uses a pseudo code for determining whether or not a search space data corresponding to a following phoneme next to a current phoneme is dynamically loaded, depending on a state of the varied phoneme sequence received from the acoustic variation channel unit.
17. The speech recognition system of claim 6 , wherein the Viterbi decoder of the pronunciation variation channel unit uses a pseudo code for determining whether or not a search space data corresponding to a following phoneme next to a current phoneme is dynamically loaded, depending on a state of the varied phoneme sequence received from the acoustic variation channel unit. 18. The speech recognition system of claim 17 , wherein, if the current phoneme is both activated and probable to be an optimal path, the pseudo code loads the search space data corresponding to the following phoneme next to the current phoneme into a memory in the pronunciation variation channel unit with reference to the arc information of the current node, whereas if the current phoneme is far from the optimal path, the pseudo code deactivates the current phoneme and does not load the search space data corresponding to the following phoneme next to the current phoneme.