计算机工程与设计
計算機工程與設計
계산궤공정여설계
COMPUTER ENGINEERING AND DESIGN
2014年
8期
2965-2968,2975
,共5页
交替投影法%模极大值%三次样条函数%小波系数%重构信号
交替投影法%模極大值%三次樣條函數%小波繫數%重構信號
교체투영법%모겁대치%삼차양조함수%소파계수%중구신호
AP algorithm%modulus maximum%cubic spline function%wavelet coefficients%reconstruct signal
为解决交替投影法计算量大、收敛速度慢的问题，提出一种基于三次样条插值的改进去噪算法。利用Adhoc算法来搜索模极大值线，求出信号的模极大值点，通过三次样条函数对信号模极大值点进行插值，得到信号的估计小波系数进而重构信号。M atlab仿真结果表明，该算法能在很大程度上去除噪声，提高信噪比，将仿真结果和其它算法进行比较，比较结果表明了该算法的收敛速度和信号优化质量明显优于其它算法。
為解決交替投影法計算量大、收斂速度慢的問題，提齣一種基于三次樣條插值的改進去譟算法。利用Adhoc算法來搜索模極大值線，求齣信號的模極大值點，通過三次樣條函數對信號模極大值點進行插值，得到信號的估計小波繫數進而重構信號。M atlab倣真結果錶明，該算法能在很大程度上去除譟聲，提高信譟比，將倣真結果和其它算法進行比較，比較結果錶明瞭該算法的收斂速度和信號優化質量明顯優于其它算法。
위해결교체투영법계산량대、수렴속도만적문제，제출일충기우삼차양조삽치적개진거조산법。이용Adhoc산법래수색모겁대치선，구출신호적모겁대치점，통과삼차양조함수대신호모겁대치점진행삽치，득도신호적고계소파계수진이중구신호。M atlab방진결과표명，해산법능재흔대정도상거제조성，제고신조비，장방진결과화기타산법진행비교，비교결과표명료해산법적수렴속도화신호우화질량명현우우기타산법。
To solve the problems of the large computation and the slow convergence speed of the alternating projection (AP) method ,an improved denoising algorithm based on cubic spline interpolation was put forward .The modulus maximum line was searched and the modulus maximum points of the signal were found by using the Adhoc algorithm ,the signal estimated wavelet coefficients were obtained from using the cubic spline interpolation function between the points of modulus maximum and the sig-nal was reconstructed .The Matlab simulation results prove that the improved denoising algorithm can improve the SNR and re-move the noise to a great degree .The convergence speed and the optimal signal quality are superior to other algorithms by com-paring with the simulation results .
