公开(公告)号：US09923551B2

公开(公告)日：2018-03-20

申请号：US15292323

申请日：2016-10-13

Applicant: ROLLS-ROYCE plc

Inventor： Lily Rachmawati ,  Eng Yeow Cheu ,  Anna Swider ,  Martijn De Jongh ,  Eivind Vinje

IPC: H03H21/00 ,  B63J99/00

CPC classification number: H03H21/0027 ,  B63J2099/006 ,  G06F17/10 ,  H03H21/002

Abstract: The invention is a method that combines the following components: a high pass filter designed to have sufficiently small phase delay and roll-off value in transition band as well as sufficiently good attenuation; a distortion detection and reconstruction introduced by the application of the high pass filter by extraction the significant frequency components in relevant frequency band; a signal compensation that reshapes the output of the high pass filter by matching the filter's phase delay and attenuation characteristics so as to approximate low frequency component extraction that would be produced by an ideal filter (very sharp frequency transition and no delay); a time-domain detection and correction method that addresses special circumstances under which the compensation would be inaccurate to achieve real-time estimate in normal circumstances, and a time-domain correction method during and immediately after sudden changes in composite signal (spike) is detected.