基于两级阈值判断结合的摩尔斯电码自动识别方法  

An Automatic Recognition Method of Morse Code Based on Two-stage Threshold Judgment

作　　者：王荔 葛珊[1] 陈骁 汤跃忠 WANG Li;GE Shan;CHEN Xiao;TANG Yuezhong(The 3rd Research Institute of China Electronics Technology Group Corporation,Beijing 100015,China)

机构地区：[1]中国电子科技集团公司第三研究所,北京100015

出　　处：《电声技术》2024年第5期137-142,共6页Audio Engineering

摘　　要：针对摩尔斯电码自动识别易出现错误的问题,提出一种基于两级阈值判断结合的摩尔斯电码自动识别方法。首先,通过带通滤波器滤除摩尔斯电码的大量背景噪声;其次,通过基于幅值的一级阈值判断实现摩尔斯电码的初步分割,通过基于时长的二级阈值判断消除摩尔斯电码的无效码;再次,通过对信号进行连码检测,进一步纠错,提升识别准确率;最后,通过比较字符串得到识别结果。实验结果表明,所提方法具有较高的识别准确率,具有一定的工程应用价值。Aiming at the problem of errors in automatic recognition of morse codes,a method for automatic recognition of morse codes based on a combination of two-level threshold judgment is proposed.Firstly,a large amount of background noise in morse code is filtered out through a bandpass filter.Secondly,preliminary segmentation of morse code is achieved through amplitude based first level threshold judgment,and invalid morse code is eliminated through duration based second level threshold judgment.Thirdly,by performing concatenated code detection on the signal,further error correction can be achieved to improve recognition accuracy.Finally,the recognition result is obtained by comparing the strings.The experimental results show that the proposed method has high recognition accuracy and certain engineering application value.

关 键 词：摩尔斯电码 两级阈值判断 带通滤波 自动识别 

分 类 号：TN919.3[电子电信—通信与信息系统]