3. The speech recognition system according to claim 2 , wherein when the addition result is greater than the second multiplication result, the second feature vector of the preset voice frame is the addition result, and when the addition result is smaller than the second multiplication result, the second feature vector of the preset voice frame is the second multiplication result.
3. The speech recognition system according to claim 2 , wherein when the addition result is greater than the second multiplication result, the second feature vector of the preset voice frame is the addition result, and when the addition result is smaller than the second multiplication result, the second feature vector of the preset voice frame is the second multiplication result. 4. The speech recognition system according to claim 3 , wherein the first scalar coefficient is between 0.01 and 0.99, and the second scalar coefficient is between 0.01 and 0.99.