The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Masayuki Kawamata - One of the best experts on this subject based on the ideXlab platform.
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high performance variable Band Pass Band stop state space digital filters using gramian preserving frequency transformation
Digital Signal Processing, 2014Co-Authors: Shunsuke Koshita, Keita Miyoshi, Masahide Abe, Masayuki KawamataAbstract:This paper presents a simple state-space-based method for design and realization of variable Band-Pass/Band-stop IIR digital filters. Our proposed variable filters not only allow us to tune the frequency characteristics, but also ensure high-performance with respect to finite wordlength effects such as L"2-norm dynamic range scaling, limit cycles, roundoff noise, and coefficient sensitivity. We achieve this property using the Gramian-preserving frequency transformation, which is implemented by replacing each delay element in a given prototype filter with a second-order all-Pass function that has the four-multiplier-lattice structure. It is shown that our proposed variable filters are described in a rather simple form without the need of the inverse matrix that appeared in the conventional Gramian-preserving frequency transformation. Moreover, we show the high-performance of our proposed method in comparison with other possible types of frequency transformations that are implemented by the typical one-multiplier/two-multiplier-lattice forms and the direct form.
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High-performance variable Band-Pass/Band-stop state-space digital filters using Gramian-preserving frequency transformation
Digital Signal Processing, 2014Co-Authors: Shunsuke Koshita, Keita Miyoshi, Masahide Abe, Masayuki KawamataAbstract:This paper presents a simple state-space-based method for design and realization of variable Band-Pass/Band-stop IIR digital filters. Our proposed variable filters not only allow us to tune the frequency characteristics, but also ensure high-performance with respect to finite wordlength effects such as L"2-norm dynamic range scaling, limit cycles, roundoff noise, and coefficient sensitivity. We achieve this property using the Gramian-preserving frequency transformation, which is implemented by replacing each delay element in a given prototype filter with a second-order all-Pass function that has the four-multiplier-lattice structure. It is shown that our proposed variable filters are described in a rather simple form without the need of the inverse matrix that appeared in the conventional Gramian-preserving frequency transformation. Moreover, we show the high-performance of our proposed method in comparison with other possible types of frequency transformations that are implemented by the typical one-multiplier/two-multiplier-lattice forms and the direct form.
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adaptive iir Band Pass Band stop filtering using high order transfer function and frequency transformation
Interdisciplinary Information Sciences, 2013Co-Authors: Shunsuke Koshita, Masahide Abe, Yuki Kumamoto, Masayuki KawamataAbstract:Received April 24, 2013; final version accepted October 22, 2013This paper proposes a new unified framework for the adaptive IIR Band-Pass/Band-stop filtering for detectionand enhancement/suppression of an unknown narrowBand signal immersed in a broadBand signal. In most of theconventional methods, which are well-known as the adaptive notch filtering, the adaptive Band-Pass/Band-stopfilter is restricted to a low-order transfer function. On the other hand, our proposed method can be applied toarbitrary high-order Band-Pass/Band-stop transfer functions in a simple manner. We derive this simple adaptivemechanism with the help of the frequency transformation and its block diagram representation. In addition, weprove that this result includes the conventional all-Pass-based adaptive notch filters as special cases. Moreover, wedemonstrate a significant property that the use of high-order adaptive Band-Pass/Band-stop filters yields muchbetter signal-to-noise ratio (SNR) improvement than the conventional low-order filters.KEYWORDS: signal processing, adaptive digital filtering, narrowBand signal, high-order transferfunction, frequency transformation
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Adaptive IIR Band-Pass/Band-Stop Filtering Using High-Order Transfer Function and Frequency Transformation
Interdisciplinary Information Sciences, 2013Co-Authors: Shunsuke Koshita, Masahide Abe, Yuki Kumamoto, Masayuki KawamataAbstract:Received April 24, 2013; final version accepted October 22, 2013This paper proposes a new unified framework for the adaptive IIR Band-Pass/Band-stop filtering for detectionand enhancement/suppression of an unknown narrowBand signal immersed in a broadBand signal. In most of theconventional methods, which are well-known as the adaptive notch filtering, the adaptive Band-Pass/Band-stopfilter is restricted to a low-order transfer function. On the other hand, our proposed method can be applied toarbitrary high-order Band-Pass/Band-stop transfer functions in a simple manner. We derive this simple adaptivemechanism with the help of the frequency transformation and its block diagram representation. In addition, weprove that this result includes the conventional all-Pass-based adaptive notch filters as special cases. Moreover, wedemonstrate a significant property that the use of high-order adaptive Band-Pass/Band-stop filters yields muchbetter signal-to-noise ratio (SNR) improvement than the conventional low-order filters.KEYWORDS: signal processing, adaptive digital filtering, narrowBand signal, high-order transferfunction, frequency transformation
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realization of variable Band Pass Band stop iir digital filters using gramian preserving frequency transformation
International Symposium on Circuits and Systems, 2010Co-Authors: Shunsuke Koshita, Keita Miyoshi, Masahide Abe, Masayuki KawamataAbstract:This paper proposes variable Band-Pass/Band-stop infinite impulse response (IIR) state-space digital filters with high tuning accuracy and reduced computational complexity. We derive our proposed variable filters from the Gramian-preserving frequency transformation based on the normalized lattice structure of second-order all-Pass functions. This approach gives a simple algorithm for control of the frequency characteristics of our proposed variable filters. In addition, we show that our proposed variable filters have smaller number of additions and multiplications than general state-space filters. Furthermore, it is shown that our proposed variable filters have the same controllability/observability Gramians as those of the prototype filters, regardless of the value of the tuning parameter. This property shows the high accuracy of our proposed filters with respect to quantization effects for all tunable frequency characteristics.
Lin-chuan Tsai - One of the best experts on this subject based on the ideXlab platform.
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Spurious Pass-Band Suppression in Coupled-Serial-Shunted Lines WideBand Band-Pass Filters
Progress In Electromagnetics Research C, 2012Co-Authors: Lin-chuan TsaiAbstract:In this paper, a synthesis method is presented for Chebyshev type II Band-Pass fllters in the microwave frequency range. We investigate the cause of the second harmonic PassBand of coupled-serial-shunted lines BandPass fllters. Filters are employed substrate suspension, wavy-edge coupling, ring resonators, defect ground structure (DGS), and a combination of the wavy-edge coupling and ring resonators may be used and were investigated to suppress the harmonic Pass-Band. With a combination of the wavy-edge coupled- lines and ring resonators, the harmonic Pass-Band of the parallel- coupled line fllter is rejected more efiectively. Several fllters are fabricated and measured to demonstrate the design.
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Harmonic Pass-Band suppression in coupled-serial-shunted lines Elliptic Band-Pass filters
2009 International Conference on Wireless Communications & Signal Processing, 2009Co-Authors: Lin-chuan TsaiAbstract:A synthesizing method is presented to design Elliptic Band-Pass filters in the microwave frequency range. The Elliptic Band-Pass filter is implemented by using a coupled-serial-shunted line structure. Using a continuous perturbation of wiggly-groove and ring resonator of the couple line the harmonic Pass-Band of the filter is rejected. An Elliptic Band-Pass filter is implemented to validate this method correct by measuring.
Shunsuke Koshita - One of the best experts on this subject based on the ideXlab platform.
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high performance variable Band Pass Band stop state space digital filters using gramian preserving frequency transformation
Digital Signal Processing, 2014Co-Authors: Shunsuke Koshita, Keita Miyoshi, Masahide Abe, Masayuki KawamataAbstract:This paper presents a simple state-space-based method for design and realization of variable Band-Pass/Band-stop IIR digital filters. Our proposed variable filters not only allow us to tune the frequency characteristics, but also ensure high-performance with respect to finite wordlength effects such as L"2-norm dynamic range scaling, limit cycles, roundoff noise, and coefficient sensitivity. We achieve this property using the Gramian-preserving frequency transformation, which is implemented by replacing each delay element in a given prototype filter with a second-order all-Pass function that has the four-multiplier-lattice structure. It is shown that our proposed variable filters are described in a rather simple form without the need of the inverse matrix that appeared in the conventional Gramian-preserving frequency transformation. Moreover, we show the high-performance of our proposed method in comparison with other possible types of frequency transformations that are implemented by the typical one-multiplier/two-multiplier-lattice forms and the direct form.
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High-performance variable Band-Pass/Band-stop state-space digital filters using Gramian-preserving frequency transformation
Digital Signal Processing, 2014Co-Authors: Shunsuke Koshita, Keita Miyoshi, Masahide Abe, Masayuki KawamataAbstract:This paper presents a simple state-space-based method for design and realization of variable Band-Pass/Band-stop IIR digital filters. Our proposed variable filters not only allow us to tune the frequency characteristics, but also ensure high-performance with respect to finite wordlength effects such as L"2-norm dynamic range scaling, limit cycles, roundoff noise, and coefficient sensitivity. We achieve this property using the Gramian-preserving frequency transformation, which is implemented by replacing each delay element in a given prototype filter with a second-order all-Pass function that has the four-multiplier-lattice structure. It is shown that our proposed variable filters are described in a rather simple form without the need of the inverse matrix that appeared in the conventional Gramian-preserving frequency transformation. Moreover, we show the high-performance of our proposed method in comparison with other possible types of frequency transformations that are implemented by the typical one-multiplier/two-multiplier-lattice forms and the direct form.
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adaptive iir Band Pass Band stop filtering using high order transfer function and frequency transformation
Interdisciplinary Information Sciences, 2013Co-Authors: Shunsuke Koshita, Masahide Abe, Yuki Kumamoto, Masayuki KawamataAbstract:Received April 24, 2013; final version accepted October 22, 2013This paper proposes a new unified framework for the adaptive IIR Band-Pass/Band-stop filtering for detectionand enhancement/suppression of an unknown narrowBand signal immersed in a broadBand signal. In most of theconventional methods, which are well-known as the adaptive notch filtering, the adaptive Band-Pass/Band-stopfilter is restricted to a low-order transfer function. On the other hand, our proposed method can be applied toarbitrary high-order Band-Pass/Band-stop transfer functions in a simple manner. We derive this simple adaptivemechanism with the help of the frequency transformation and its block diagram representation. In addition, weprove that this result includes the conventional all-Pass-based adaptive notch filters as special cases. Moreover, wedemonstrate a significant property that the use of high-order adaptive Band-Pass/Band-stop filters yields muchbetter signal-to-noise ratio (SNR) improvement than the conventional low-order filters.KEYWORDS: signal processing, adaptive digital filtering, narrowBand signal, high-order transferfunction, frequency transformation
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Adaptive IIR Band-Pass/Band-Stop Filtering Using High-Order Transfer Function and Frequency Transformation
Interdisciplinary Information Sciences, 2013Co-Authors: Shunsuke Koshita, Masahide Abe, Yuki Kumamoto, Masayuki KawamataAbstract:Received April 24, 2013; final version accepted October 22, 2013This paper proposes a new unified framework for the adaptive IIR Band-Pass/Band-stop filtering for detectionand enhancement/suppression of an unknown narrowBand signal immersed in a broadBand signal. In most of theconventional methods, which are well-known as the adaptive notch filtering, the adaptive Band-Pass/Band-stopfilter is restricted to a low-order transfer function. On the other hand, our proposed method can be applied toarbitrary high-order Band-Pass/Band-stop transfer functions in a simple manner. We derive this simple adaptivemechanism with the help of the frequency transformation and its block diagram representation. In addition, weprove that this result includes the conventional all-Pass-based adaptive notch filters as special cases. Moreover, wedemonstrate a significant property that the use of high-order adaptive Band-Pass/Band-stop filters yields muchbetter signal-to-noise ratio (SNR) improvement than the conventional low-order filters.KEYWORDS: signal processing, adaptive digital filtering, narrowBand signal, high-order transferfunction, frequency transformation
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realization of variable Band Pass Band stop iir digital filters using gramian preserving frequency transformation
International Symposium on Circuits and Systems, 2010Co-Authors: Shunsuke Koshita, Keita Miyoshi, Masahide Abe, Masayuki KawamataAbstract:This paper proposes variable Band-Pass/Band-stop infinite impulse response (IIR) state-space digital filters with high tuning accuracy and reduced computational complexity. We derive our proposed variable filters from the Gramian-preserving frequency transformation based on the normalized lattice structure of second-order all-Pass functions. This approach gives a simple algorithm for control of the frequency characteristics of our proposed variable filters. In addition, we show that our proposed variable filters have smaller number of additions and multiplications than general state-space filters. Furthermore, it is shown that our proposed variable filters have the same controllability/observability Gramians as those of the prototype filters, regardless of the value of the tuning parameter. This property shows the high accuracy of our proposed filters with respect to quantization effects for all tunable frequency characteristics.
Min Zhong - One of the best experts on this subject based on the ideXlab platform.
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Tunable Bandwidth of Pass-Band metamaterial filter based on coupling of localized surface plasmon resonance
Optical Materials, 2015Co-Authors: Bing Han, Beibei Dong, Jingyu Nan, Min ZhongAbstract:Abstract A broad Pass-Band compound structure metamaterial is designed which consists of periodic two metallic particles and hole arrays. The operating Bandwidth of the designed structure reaches to Δf ≈ 33.8 THz. Physical mechanisms are analyzed and validated based on calculated electric field distribution that the interaction and coupled of LSP modes between two metallic particles leads to the Bandwidth increased and resonance frequency blue-shifted, while the interaction and coupled between metallic particle and metallic arrays results in the reduced of the Pass-Band. The Pass-Band can be expanded through reducing the permittivity of dielectric layer or reducing the width of the metallic particle (a). The effect of the angles of incidence on the Pass-Band is also analyzed for normal, 15°, 30° and 45°.
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Experimental and numerical study of a broad Pass-Band low-loss optical metamaterials filter
Optical Materials, 2015Co-Authors: Min ZhongAbstract:Abstract We present the simulation, and fabrication of an optical metamaterial filter. It consists of two silver layers and one SU-8 layer perforated with periodic sub-wavelength holes arrays which are prepared by optical lithography. Measured results indicate that a broad Pass-Band with over 96% transmittance across 90.0–105.0 THz frequency range can be obtained. Effective permeability, permittivity, and impedance are retrieved by applying S parameter retrieval method. These retrieved effective parameters show that the fabricated metamaterial filter can be modulated from a double negative material to a normal material in Pass-Band. Real parts of effective permeability and permittivity follow a similar slope results in well-matched impedance to free space, which leads to the broad Pass-Band. Furthermore, effects of nano-hole sidewall length ( w 2) and thickness of dielectric layer ( h 1) are experimental surveyed. The Pass-Band is expanded with w 2 increasing or h 1 reducing due to the reduced of strength of electromagnetic resonance.
Lau Chiew Tong - One of the best experts on this subject based on the ideXlab platform.
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novel approach to the design of weighted minimax quadrature mirror filters
Information Sciences Signal Processing and their Applications, 2001Co-Authors: A.p. Vinod, A.b. Premkumar, Lau Chiew TongAbstract:The weighted least squares (WLS) algorithm is widely employed for designing quadrature mirror filters (QMF) in the frequency domain. The equiripple nature of the WLS design and its performance near the filter Band edge have been reported to be better than that of the least squares (LS) design. It is known that these design techniques suffer from Pass-Band anomaly under different stop Band frequencies. We have proposed an algorithm to eliminate Pass-Band anomaly of LS design. In this paper, we show that WLS can be modified in way similar to that proposed for the LS design. The characteristics of the resulting filters satisfy the stop Band requirements and do not show anomaly in the Pass Band region.
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ISSPA - Novel approach to the design of weighted minimax quadrature mirror filters
Proceedings of the Sixth International Symposium on Signal Processing and its Applications (Cat.No.01EX467), 1Co-Authors: A.p. Vinod, A.b. Premkumar, Lau Chiew TongAbstract:The weighted least squares (WLS) algorithm is widely employed for designing quadrature mirror filters (QMF) in the frequency domain. The equiripple nature of the WLS design and its performance near the filter Band edge have been reported to be better than that of the least squares (LS) design. It is known that these design techniques suffer from Pass-Band anomaly under different stop Band frequencies. We have proposed an algorithm to eliminate Pass-Band anomaly of LS design. In this paper, we show that WLS can be modified in way similar to that proposed for the LS design. The characteristics of the resulting filters satisfy the stop Band requirements and do not show anomaly in the Pass Band region.
