Title: No distortion digital differential filtering method
Application Number: 200610157096 Application Date: 2006.11.27
Publication Number: 1988309 Publication Date: 2007.06.27
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H02J3/01;H02M1/12;H03H11/04
Applicant(s) Name: Huawei Technology Co., Ltd. Address:
Inventor(s) Name: Yu Jianhua
Attorney & Agent:
Abstract:
    This invention provides a nondistorted digital filter method including setting a sampling frequency for sampling signals and difference step computing differences, which samples signals with the sample frequency, deducts a sample point signal value spaced in a difference step from each sample point signal value to recover the phase with the difference computed signal values, in which, the rario of the sample frequency and the signal frequency is the integral times of 6 and the difference step is the unit sample frequency of the number of the integral times, and amplitude after difference computation is unchanged and the phase change angle of the computed signal is pi/3=60deg., a special angle.
Time: 7