A New Method for Least-Squares and Minimax Group-Delay Error Design of Allpass Variable Fractional-Delay Digital Filters
نویسندگان
چکیده
A double-loop iterative method is proposed to design allpass variable fractional-delay (VFD) digital filters basing on the minimization of root-mean-squared group-delay error. In the inner loop, an iterative quadratic optimization is proposed to replace the original nonlinear optimization for the minimization of root-mean-squared group-delay error, while an iterative weighting-updated technique is applied in the outer loop to further reduce the maximum group-delay error. Several examples will be presented to demonstrate the effectiveness and good convergence of the proposed method.
منابع مشابه
Weighted Least-Squares Method for Designing Variable Fractional Delay 2-D FIR Digital Filters
This paper proposes a closed-form weighted least-squares solution for designing variable two-dimensional (2-D) finite-impulse response (FIR) digital filters with continuously variable 2-D fractional delay responses. First, the coefficients of the variable 2-D transfer function are represented by using the polynomials of a pair of fractional delays ( 1 2). Then the weighted squared-error functio...
متن کاملAn Improved Weighted Least-Squares Design for Variable Fractional Delay FIR Filters
Digital filters capable of changing their frequency response characteristics are often referred to as variable digital filters (VDF’s) and have been found useful in a number of digital signal processing applications. An important class of VDF’s is the class of digital filters with variable fractional delay. This paper describes an enhanced weighted least-squares design for variable-fractional-d...
متن کاملA New Structure and Design Method for Variable Fractional - Delay 2 - D FIR Digital Filters
In this paper, a new structure is proposed for the computational design of variable fractional-delay (VFD) 2-D FIR digital filters. Based on the Taylor series expansion of the desired frequency response, a prefilter-subfilter cascaded structure can be derived. For the 1-D differentiating prefilters and the 2-D quadrantally symmetric subfilters, they can be designed simply by the least-squares m...
متن کاملA weighted least square algorithm for low-delay FIR filters with piecewise variable stopbands
Variable digital filters are useful for various signal processing and communication applications where the frequency characteristics, such as fractional delays and cutoff frequencies, can be varied. In this paper, we propose a design method of variable FIR digital filters with an approximate linear phase characteristic in the passband. The proposed variable FIR filters have some large attenuati...
متن کاملVariable Fractional Delay Filter Design Using a Symmetric Window
In this paper a numerically efficient method for designing a nearly optimal variable fractional delay (VFD) filter based on a simple and well-known window method is presented. In the proposed method a single window extracted from the optimal filter with fixed fractional delay (FD) is divided into even and odd part. Subsequently, the odd part is discarded and symmetric even part of the extracted...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- EURASIP J. Adv. Sig. Proc.
دوره 2010 شماره
صفحات -
تاریخ انتشار 2010