CAJ | 학술논문

文中首先通过单位圆相位影射的方式推导出任意正交变换下全相位信号处理的数学表达式，并画出系统实现原理图和带双窗的全相位正交变换域处理图。基于全相位数字滤波器，本文设计并实现了频域自适应滤波器，对加噪信号进行N次全相位频谱归一化处理，并递归设置幅值为1的频点而形成完整的传输特性，噪声的判断通过单次谱分析和全相位谱分析的均值和方差特性来进行。实验中，对于淹没在强噪声中的信号进行了全相位自适应滤波，结果表明，对于整倍频率分辨率信号可以无失真恢复。全相位自适应滤波恢复得到的信号信噪比提高0．8 dB左右，而且通过提高滤波器阶数N或进行频谱校正可以进一步提高恢复信号质量。
문중수선통과단위원상위영사적방식추도출임의정교변환하전상위신호처리적수학표체식，병화출계통실현원리도화대쌍창적전상위정교변환역처리도。기우전상위수자려파기，본문설계병실현료빈역자괄응려파기，대가조신호진행N차전상위빈보귀일화처리，병체귀설치폭치위1적빈점이형성완정적전수특성，조성적판단통과단차보분석화전상위보분석적균치화방차특성래진행。실험중，대우엄몰재강조성중적신호진행료전상위자괄응려파，결과표명，대우정배빈솔분변솔신호가이무실진회복。전상위자괄응려파회복득도적신호신조비제고0．8 dB좌우，이차통과제고려파기계수N혹진행빈보교정가이진일보제고회복신호질량。
In this paper all-phase signal processing mathematical expression is firstly deduced by means of mapping the phase in unit circle to all-phase outputs and the implementation system is also given.The reason of improving all-phase pro-cessing effect by adding windows is pointed out.Accordingly the architecture of all-phase with dual-window in orthogonal transform is drawn out.Secondly,adaptive filter based on all-phase is designed,in which signals adding noise are pro-cessed N times in the all-phase spectrum normalization way.It is recursively to set frequency point to amplitude 1 so to form the whole transmission property H.Noise is judged by the mean value and variance of single and all-phase spectrum analy-sis.In the test,the drowned signals by noise are processed using all-phase adaptive filter.The result verifies that signals which frequency is n times of spectrum resolution can be totally recovered without lost.Signal quality is improved by 0.8dB,which can be further improved by means of increasing N or correcting spectrum.