协调语音能量区域的正则化优化算法

Regularization optimization algorithm for coordinating speech energy region

为有效解决语音识别模型过拟合问题,提出一种协调语音能量区域的正则化优化算法。根据语音的共振峰特性,对语音信号高能量区域进行集体失活处理,增加模型对语音信号低能量区域的关注度;为进一步提升声学模型性能,采用堆叠8层的门控卷积神经网络提取语音时序特征,并对其中的门控机制进行优化,缓解梯度衰减现象;采用联结时序分类算法以汉字为建模单元对语音识别模型进行训练和解码。在公开中文语音数据集Aishell-1上的实验结果表明,该语音识别模型字错率降低至11.27%,与基线模型相比,字错率下降了7.93%,验证了该方法的有效性。

To effectively solve the overfitting problem of the speech recognition model,a regularized optimization algorithm for coordinating speech energy regions was proposed.The high-energy areas of the speech signal were collectively dropped according to the resonance peak characteristics,increasing the model’s focus on the low-energy areas of the speech signal.To further improve the acoustic model performance,a gated convolutional neural network(GCNN)with stacked eight layers was used to extract speech timing features,and the gating mechanism in it was optimized to alleviate the gradient fading phenomenon effectively.The connectionist temporal classification(CTC)algorithm was used to train and decode the speech recognition model with Chinese characters as the modeling unit.Experimental results on Aishell-1,an open Chinese speech dataset,show that the word error rate of the speech recognition model is reduced to 11.27%,and the word error rate is reduced by 7.93%compared with the baseline model,which verifies the effectiveness of the method.