Zero-Phase Filter Bank and Wavelet Code r Matrices: Properties, Triangular Decompositions, and a Fast Algorithm

1997 ◽  
pp. 71-88 ◽  
Author(s):  
T. G. Marshall
Keyword(s):  
Fast Algorithm ◽  
Filter Bank ◽  
Phase Filter ◽  
Zero Phase

Research on Digital Baseband Converting Methods in Interference Measurement System

2014 ◽  
Vol 716-717 ◽  
pp. 978-982
Author(s):  
Xiao Min Hou ◽  
Shao Jie Wei ◽  
Xin Lian
Keyword(s):  
Measurement System ◽  
Phase Structure ◽  
Filter Bank ◽  
Parallel Structure ◽  
Full Spectrum ◽  
Phase Filter ◽  
Interference Measurement ◽  
Mixing Method ◽  
Digital Baseband

Focused on DBBC(digital baseband converter) which is used in interferencemeasurement system, two typical digital baseband converting methods are introduced. Using parallel structure and poly-phase structure to improve the orthogonal mixing method, the method based on parallel conversion is proposed. Combining the efficient PFB(poly-phase filter bank) channelization with theflexible orthogonal mixing , the method combining PFB channelization with the orthogonal mixing is proposed. This method can realize full spectrum received.Considering the efficiency and power, the method combining PFB channelization with the orthogonal mixing is better.

Application of Zero-Phase Digital Filter in Magnetic Flux Leakage Testing for Tank Floor Inspection

2013 ◽  
Vol 333-335 ◽  
pp. 1644-1648
Author(s):  
Fu Jun Liu ◽  
Zhang Wei Ling ◽  
Shuai Kong ◽  
Mu Lin Zheng
Keyword(s):  
Magnetic Flux ◽  
Digital Filter ◽  
Signal To Noise Ratio ◽  
Phase Distortion ◽  
Magnetic Flux Leakage ◽  
Location Accuracy ◽  
Phase Filter ◽  
Testing Technology ◽  
Flux Leakage ◽  
Zero Phase

Magnetic flux leakage (MFL) testing, as a modern nondestructive testing technology, has significant application in tank floor corrosion defect inspection. In view of signal characteristics in the MFL testing of tank floor, an improved signal progressing method combining software and hardware was presented. Especially, in order to avoid phase distortion caused by applying common digital filter, zero-phase digital filter which could effectively eliminate the phase distortion was proposed to improve the location accuracy of defect. Experiment results showed that the signal progressing method could improve signal-to-noise ratio, and the peak-peak value of defect signal had a good linear relationship with the depth of defect which showed that the proposed method could meet the requirement of the MFL testing. Comparing results showed that, the maximal location error of zero-phase filter was 2 mm and that of common digital filter was 24 mm, which showed that zero-phase filter had better defect location accuracy.

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