Ishaq Rizwan, Zapirain Begoña García
Technol Health Care. 2016;24(2):201-13. doi: 10.3233/THC-161129.
This paper proposes an Oesophageal Speech (OES) enhancement method, based on Kalman filtering. The Kalman filter is applied to modulators of OES frequency subbands instead of the fullband signal. The OES frequency subbands are decomposed into modulators and carriers components using coherent demodulation. In comparison with fullband Kalman filtering and pole stabilization, the proposed technique shows better results. The system performance is evaluated objectively and subjectively using the Harmonic to Noise Ratio (HNR) and Mean Opinion Score (MOS) respectively. Results have shown that Kalman filter in subband modulators processing is robust and efficient, improving the HNR by 4 to 5 dB for all Spanish vowels.
本文提出了一种基于卡尔曼滤波的食管语音（OES）增强方法。卡尔曼滤波器应用于食管语音频率子带的调制器，而非全频带信号。利用相干解调将食管语音频率子带分解为调制器和载波分量。与全频带卡尔曼滤波和极点稳定化相比，该技术表现出更好的效果。分别使用谐波噪声比（HNR）和平均意见得分（MOS）对系统性能进行客观和主观评估。结果表明，子带调制器处理中的卡尔曼滤波器稳健且高效，所有西班牙语元音的HNR提高了4至5分贝。
