scholarly journals Effects of non-ideal group delay and reflection characteristics of chirped fibre grating dispersion compensators

1997 ◽  
Author(s):  
K. Ennser
Keyword(s):  
Group Delay ◽  
Reflection Characteristics ◽  
Ideal Group

Near-Perfect Reconstruction Oversampled Nonuniform Cosine-Modulated Filter Banks Based on Frequency Warping and Subband Merging

2012 ◽  
Vol 58 (2) ◽  
pp. 177-192 ◽  
Author(s):  
Marek Parfieniuk ◽  
Alexander Petrovsky
Keyword(s):  
Group Delay ◽  
Filter Banks ◽  
Main Idea ◽  
Perceptual Processing ◽  
Perfect Reconstruction ◽  
Frequency Warping ◽  
Small Loss ◽  
Novel Method ◽  
The One ◽  
Near Perfect Reconstruction

Near-Perfect Reconstruction Oversampled Nonuniform Cosine-Modulated Filter Banks Based on Frequency Warping and Subband MergingA novel method for designing near-perfect reconstruction oversampled nonuniform cosine-modulated filter banks is proposed, which combines frequency warping and subband merging, and thus offers more flexibility than known techniques. On the one hand, desirable frequency partitionings can be better approximated. On the other hand, at the price of only a small loss in partitioning accuracy, both warping strength and number of channels before merging can be adjusted so as to minimize the computational complexity of a system. In particular, the coefficient of the function behind warping can be constrained to be a negative integer power of two, so that multiplications related to allpass filtering can be replaced with more efficient binary shifts. The main idea is accompanied by some contributions to the theory of warped filter banks. Namely, group delay equalization is thoroughly investigated, and it is shown how to avoid significant aliasing by channel oversampling. Our research revolves around filter banks for perceptual processing of sound, which are required to approximate the psychoacoustic scales well and need not guarantee perfect reconstruction.

A Correlation-peak Fining Algorithm for Group Delay Measurement of Radio Frequency System

2014 ◽  
Vol 35 (12) ◽  
pp. 2921-2926
Author(s):  
Chen-xi Lu ◽  
Hong-yu Li ◽  
Feng Nian ◽  
Ke-ming Feng
Keyword(s):  
Radio Frequency ◽  
Group Delay ◽  
Correlation Peak ◽  
Delay Measurement
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