应用ResNet和CatBoost检测重放语声*

针对短语声指令声频信息少、不适用句子级重放语声检测的问题以及近距离录声后用高质量重放设备重放的语声难以检测的问题，提出了一种适用于词级重放语声检测的模型。首先，利用短时傅里叶变换、低频平均能量计算和帧排序等方法选择声频帧，然后提取这些帧的伽马通频率倒谱系数。其次，用基于自注意机制的残差网络模型进一步提取伽马通频率倒谱系数中的信息，并转化为特征向量。最后，将提取后的特征向量用CatBoost分类，从而提高检测性能。在POCO数据集上的实验结果表明，提出的方法可以以87.54%的准确率和12.53%的等错误率检测重放语声，优于基线和现有的方法。该文提出的方法在ASVspoof2019 PA数据集上的等错误率与串联检测代价函数分别为4.92%和0.1418，证明该文方法也适用于多种设置的重放语声检测。

Detection of replay voice by ResNet and CatBoost

To deal with the problem that short voice commands have little audio information and are not suitable for sentence-level replay voice detection as well as the problem that voice replayed with high quality device after short distance recording is difficult to detect, a model for word-level replay voice detection is proposed. Firstly, short time Fourier transform, low frequency average energy computation and frame sorting are used to select audio frames reasonably, followed by the acoustic feature extraction of these frames based on Gammatone frequency cepstral coefficient (GFCC). Then, the information in the GFCC is further extracted with a self-attentional residual network (ResNet) model and converted into feature vectors. Finally, the extracted feature vectors are classified by CatBoost to improve detection performance. The experimental results on the POCO dataset show that our proposal can achieve replay voice detection with the accuracy of 87.54% and the equal error rate of 12.53%, outperforming the baseline and existing methods. The equal error rate and concatenation detection cost function of the method proposed in this paper on the ASVspoof2019 PA dataset are 4.92% and 0.1418 respectively, which demonstrates that our proposal is also suitable for replay voice detection in various settings.