| 刘斌,汪源源,王威琪.利用改进的百分比法提取多普勒血流声谱图包络[J].声学技术,1998,(1):9~11,14 |
| 利用改进的百分比法提取多普勒血流声谱图包络 |
| Extracting the sonogram envelop using the improved percentile method |
| 投稿时间：1997-02-21 |
| DOI： |
| 中文关键词: 声谱图包络 信号 噪声 功率 百分比法 |
| 英文关键词: sonogram envelop signal noise power percentile method |
| 基金项目: |
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| 摘要点击次数: 1865 |
| 全文下载次数: 955 |
| 中文摘要: |
| 本文从最大频率的数字估计方法着手,提取声谱图的包络。通过分析以往4种最大频率的数字估计方法的不足,提出一种方法,称改进的百分比法。它选取信号加噪声的总功率φT=φ(fH)作为判据,对一个心动周期内不同阶段采取不同的最大频率估计。应用该方法对近20例临床数据提取声谱图包络,取得了较好效果。 |
| 英文摘要: |
| In this paper, the extraction of sonogram envelop by estimation of the maximum frequency is discussed. After analyzing the shortcomings of the former four digital estimation algorithms of maximum frcqucncy,an improved percentile method is put forward,which uses the total signal plus noise power as a threshold to choose different ways to estimate maximum frequency under different phases of a cardiac cycle,and gains quite well results of about 20 clinical cases. |
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