scholarly journals Analysis of half-band approximately linear phase IIR filter realization structure in MATLAB

2015 ◽  
Vol 28 (4) ◽  
pp. 611-623 ◽  
Author(s):  
Aleksandar Radonjic ◽  
Jelena Certic
Keyword(s):  
Fixed Point ◽  
Detailed Analysis ◽  
Filter Design ◽  
Linear Phase ◽  
Parallel Connection ◽  
Iir Filter ◽  
Filter Structure ◽  
Band Filter ◽  
Design Algorithms

In this paper a detailed analysis of an atypical filter structure in MATLAB Filter Design and Analysis (FDA) Tool is presented. As an example of atypical filter structure, the IIR half-band filter with approximately linear phase realized as a parallel connection of two all-pass branches was examined. We compare two types of those filters obtained by two different design algorithms. FDA tool was used for the experiment because different effects of the fixed point implementation can be simulated easily. One of the goals of this paper was to compare results obtained by two different design algorithms. In addition, different realizations of the filter structure based on the parallel connection of two all-pass branches were examined.

Half-Band Filter Design Based on MATLAB and FPGA

2011 ◽  
Vol 130-134 ◽  
pp. 2027-2030
Author(s):  
Jun Wu ◽  
Chao Fan Zhang
Keyword(s):  
Signal Processing ◽  
Simple Structure ◽  
Filter Design ◽  
Digital Signal ◽  
Fir Filter ◽  
Linear Phase ◽  
Excellent Performance ◽  
Rate System ◽  
Simulation Process ◽  
Band Filter

Half-band filter is a linear phase FIR filter, which is symmetric-even and odd .Because the coefficient of half-band filter is symmetrical and nearly half of the coefficient are zero, it make the filters reduce the number of multiplication operations by almost 3 / 4, and the number of addition operations by nearly half . The memory used to store filter coefficients are also reduced by half, so it make the implementation of efficient real-time digital signal processing more conducive. The half-band filter has many characteristics: for instance, simple structure, easy to implement and excellent performance, it is widely used in multi-rate system. This paper first describes the principle of half-band FIR filter, the character and method for implementation, then puts forward the design and simulation process which is based on MATLAB and Xilinx's half-band filter, and at last analyses the result.

Fixed-point digital IIR filter design using two-stage ensemble evolutionary algorithm

2013 ◽  
Vol 13 (1) ◽  
pp. 329-338 ◽  
Author(s):  
Bin Li ◽  
Yu Wang ◽  
Thomas Weise ◽  
Long Long
Keyword(s):  
Fixed Point ◽  
Evolutionary Algorithm ◽  
Filter Design ◽  
Two Stage ◽  
Iir Filter ◽  
Digital Iir Filter

scholarly journals Efficient uniform digital filter bank with linear phase and FRM technique for hearing aids

2018 ◽  
Vol 7 (1.9) ◽  
pp. 69 ◽  
Author(s):  
G Parameshappa ◽  
D Jayadevapp
Keyword(s):  
Digital Filter ◽  
Hearing Aids ◽  
Filter Bank ◽  
Fir Filter ◽  
Linear Phase ◽  
Iir Filters ◽  
Iir Filter ◽  
Band Filter ◽  
Frequency Response Masking ◽  
Digital Filter Bank

This paper attempts to present an uniform digital filter bank based on linear phase FIR and IIR filters applied for Frequency Response Masking (FRM) technique in hearing aid applications.In the proposed filter bank, nine uniformly spaced sub-bands are formed with the help of half band filters and masking filters. These nine channel FIR filter bank is realized using an interpolated half band linear phase FIR filter and an appropriate number of masking FIR filters. The nine channel IIR filter bank is realized using an interpolated half band approximately linear phase IIR filter and an appropriate number of masking filters. The proposed approximately linear phase IIR half band filter bank is compared with filter bank based on linear phase FIR half band filters in terms of area, power, memory and number of gates needed for implementation. The experiment was carried on various hearing loss cases and the results obtained from these tests proves that, the proposed filter bank achieved the required matching between audiograms and magnitude response of the filter bank at very reasonable range with less computational complexity.

scholarly journals Simplified Modal-Cancellation Approach for Substrate-Integrated-Waveguide Narrow-Band Filter Design

Electronics ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 962 ◽  
Author(s):  
Sebastian Celis ◽  
Mohamed Farhat ◽  
Abdullah S. Almansouri ◽  
Hakan Bagci ◽  
Khaled N. Salama
Keyword(s):  
Filter Design ◽  
Narrow Band ◽  
Substrate Integrated Waveguide ◽  
New Approach ◽  
Frequency Bands ◽  
Order Filter ◽  
Filter Structure ◽  
Band Filter ◽  
Narrow Band Filter ◽  
Periodic Number

Current substrate-integrated-waveguide (SIW) filter design methodologies can be extremely computational and time-inefficient when a narrow-band filter is required. A new approach to designing compact, highly selective narrow-band filters based on smartly positioned obstacles is thus presented here. The proposed modal-cancellation approach is achieved by translating or eliminating undesired modes within the frequency of interest. This is performed by introducing smartly located obstacles in the maxima and nulls of the modes of interest. This approach is different from the traditional inverter technique, where a periodic number of inductive irises are coupled in a ladder configuration to implement the desired response of an nth-order filter, and significantly reduces the complexity of the resulting filter structure. Indeed, the proposed method may be used to design different filters for several frequency bands and various applications. The methodology was experimentally verified through fabricated prototypes.

A Procedure for Quasi-Equiripple Linear-Phase IIR Filters Design

2010 ◽  
Vol 56 (4) ◽  
pp. 393-398 ◽  
Author(s):  
Jacek Konopacki ◽  
Katarzyna Mościńska
Keyword(s):  
Arbitrary Number ◽  
Group Delay ◽  
Filter Design ◽  
Linear Phase ◽  
Iir Filters ◽  
Iir Filter ◽  
Filter Order ◽  
Number Of Zeros

A Procedure for Quasi-Equiripple Linear-Phase IIR Filters DesignThe linear-phase IIR filters are described in many cases, mainly due to distortion-free transmission of signals. One of the major problems of IIR filter design is stability, which can be obtained with suitable value of group delay τ. This paper concerns calculation of filter orderNand group delay τ in case of quasi-equiripple design of IIR filters. We propose a novel procedure for determiningNand τ values; the procedure is valid for all types of filters with arbitrary number of zeros and a few non-zero poles. Evaluation of the proposed approach as well as examples illustrating its application are provided in the paper.

Low computation digital down converter using polyphase IIR filter

Circuit World ◽  
2019 ◽  
Vol 45 (3) ◽  
pp. 169-178 ◽  
Author(s):  
Hiren K. Mewada ◽  
Jitendra Chaudhari
Keyword(s):  
Group Delay ◽  
Filter Design ◽  
Fir Filter ◽  
Linear Phase ◽  
Content Type ◽  
Iir Filters ◽  
Iir Filter ◽  
Alternative Option ◽  
Digital Down Converter ◽  
Sample Rate

Purpose The digital down converter (DDC) is a principal component in modern communication systems. The DDC process traditionally entails quadrature down conversion, bandwidth reducing filters and commensurate sample rate reduction. To avoid group delay, distortion linear phase FIR filters are used in the DDC. The filter performance specifications related to deep stopband attenuation, small in-band ripple and narrow transition bandwidth lead to filters with a large number of coefficients. To reduce the computational workload of the filtering process, filtering is often performed as a two-stage process, the first stage being a down sampling Hoegenauer (or cascade-integrated comb) filter and a reduced sample rate FIR filter. An alternative option is an M-Path polyphase partition of a band cantered FIR filter. Even though IIR filters offer reduced workload to implement a specific filtering task, the authors avoid using them because of their poor group delay characteristics. This paper aims to propose the design of M-path, approximately linear phase IIR filters as an alternative option to the M-path FIR filter. Design/methodology/approach Two filter designs are presented in the paper. The first approach uses linear phase IIR low pass structure to reduce the filter’s coefficient. Whereas the second approach uses multipath polyphase structure to design approximately linear phase IIR filter in DDC. Findings The authors have compared the performance and workload of the proposed polyphase structured IIR filters with state-of-the-art filter design used in DDC. The proposed design is seen to satisfy tight design specification with a significant reduction in arithmetic operations and required power consumption. Originality/value The proposed design is an alternate solution to the M-path polyphase FIR filter offering very less number of coefficients in the filter design. Proposed DDC using polyphase structured IIR filter satisfies the requirement of linear phase with the least number of computation cost in comparison with other DDC structure.

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