• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>1995 Fourth IEEE international conference on universal personal communications record : Gateway to the 21st century >A Kalman Filtering Noise Canceler for PDC Speech Enhancement
【24h】

A Kalman Filtering Noise Canceler for PDC Speech Enhancement

机译：用于PDC语音增强的卡尔曼滤波噪声消除器

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Speech enhancement techniques suitable for digital mobile communication systems are proposed. The proposed methods improve the speech quality and enlarge the continuous conversation time of any mobile radio system. The enhancement techniques, whose complexity is about 1/10th that of the speech codec, are easily implemented in the same chip as the speech CODEC. The core of the proposed techniques is a noise canceler based on a Kalman filter and signal-state estimation. We employ the Kalman filtering algorithm for its optimum filtering performance for time varying signals. In order to achieve effective noise cancelation with the filter, the filtering parameters are controlled according to the estimated signal-state. The speech enhancement performance of the proposed noise canceler is evaluated in terms of mean opinion score (MOS). The proposed techniques improve noisy speech quality by half a point in MOS at the noise level of 50 dBA. Improvements in transmission time ratio by employing the proposed noise canceler in the Japanese PDC (Personal Digital Cellular) system are evaluated. The combination of voice operated transmission (VOX) in PDC and the noise canceling techniques save the battery life. The transmission period ratio is improved by 20% at the noise level of 60 dBA. We describe a speech detection scheme and processing method for reducing the speech degradation due to VOX operation.
机译：提出了适用于数字移动通信系统的语音增强技术。所提出的方法提高了语音质量，并延长了任何移动无线电系统的连续通话时间。增强技术的复杂度约为语音编解码器的1/10，可以很容易地在与语音编解码器相同的芯片中实现。所提出技术的核心是基于卡尔曼滤波器和信号状态估计的噪声消除器。我们采用Kalman滤波算法来实现对时变信号的最佳滤波性能。为了利用滤波器​​实现有效的噪声消除，根据估计的信号状态来控制滤波参数。提出的噪声消除器的语音增强性能是根据平均意见得分（MOS）进行评估的。所提出的技术在50 dBA的噪声水平下将MOS的有声语音质量提高了一半。通过在日本PDC（个人数字蜂窝）系统中采用建议的噪声消除器，可以评估传输时间比率的改进。 PDC中的语音操作传输（VOX）和噪音消除技术相结合，可以节省电池寿命。在60 dBA的噪声水平下，传输周期比率提高了20％。我们描述了一种语音检测方案和处理方法，用于减少由于VOX操作而引起的语音质量下降。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号