• 作者： 林銀議; 葉俊麟
• 作者服務機構： 中央大學電機系; 中原大學電子系
• 中文摘要： 本文針對數值磁記錄部分反應／最佳估計通道中，PR-IV等化器之最佳化設計，提出利用模擬退火法則與一傳統下坡方法混合應用於PR-IV等化器的最佳化設計，此法證明能較容易找到最佳等化器的參數。此法應用於勞倫玆記錄通道中，並證明由6零點6極點之振幅等化器及相位等化器所構成之PR-IV等化器已經足夠將記錄密度介於1與3問之勞倫玆通道·等化成所需的格式．
• 英文摘要： A variable metric descent method developed by Davidon, Fletcher and Powell（the DFP method)is widely used to optimize (minimize) objective functions. Like other descent methods, it suffers frompoor convergence if the objective function has multiple minima if an initial guess is not carefully chosen,it reaches a local minimum. We present a combinatorial optimization technique that uses the simulatedannealing (SA) algorithm in conjunction with the DFP method. The combinatorial optimization techniqueavoids local minima and ultimately reaches the global minimum This technique is applied to optimizationof the PR-IV equalizer using analog filters and is shown to be superior to the DFP method. Finally, thiscombinatorial technique is used in optimization of a PR-IV equalizer for a Lorentzian recording channel,and it is found that the PR-IV equalizer composed of a 6-pole, 6-zero amplitude equalizer and a 6-pole,6-zero phase equalizer is adequate to shape the playback signal to the desired PR-IV format at densitiesof interest (between 1 and 3).
• 中文關鍵字： PR-IV equalizer; decent method; simulated annealing; Lorentzian recording channel
• 英文關鍵字： --