Simulation and Integrated Circuit implementation of All pass and Bandpass filter
03 Jul 2020-pp 1-5
TL;DR: This paper talks about the effect of distortion on speech or audio signal and aims to prove using a MATLAB simulation, why human ear is not perceptive to phase distortion and a bandpass filter designed is also implemented to filter out undesirable frequencies which may be present along with the input signal.
Abstract: This paper talks about the effect of distortion on speech or audio signal and aims to prove using a MATLAB simulation, why human ear is not perceptive to phase distortion. A bandpass filter designed is also implemented to filter out undesirable frequencies which may be present along with the input signal. This was carried out in software and hardware. The inspiration is drawn from various research papers and articles online and it is very intriguing to work with All pass filters given the wide scale real-life applications of All pass filters in places where one could never even imagine for them to be present.
References
More filters
Journal Article•
27 citations
"Simulation and Integrated Circuit i..." refers background in this paper
...Phase Distortion: In digital signal processing, phasefrequency [1] distortion is called as a change in the waveform’s shape, which occurs when (a) the phase response of the filter is non-linear in the frequency range of interest....
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TL;DR: A new technique for designing the all-pass-based notch filter that has the mirror-image symmetry relation between the numerator and denominator polynomials and a relationship between the pole angel and the zero angle is derived.
Abstract: In this brief, a new technique for designing the all-pass-based notch filter is proposed. An all-pass-based notch filter consists of an all-pass filter, which has the mirror-image symmetry relation between the numerator and denominator polynomials. With this property, a relationship between the pole angel and the zero angle of an all-pass-based notch filter is derived. Knowing this relationship, we can design an all-pass-based notch filter by assigning the pole position according to the zero position. The process of the new technique is illustrated in this brief. Moreover, experiments are presented to examine a track of the pole position at the specific frequency and to demonstrate a design example of an all-pass-based notch filter.
11 citations
"Simulation and Integrated Circuit i..." refers background in this paper
...The APF can be constructed using bulk delay with feedback and feedback paths [6], for this application....
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TL;DR: In this paper, an improved version of the all pass filtering technique is presented and the factorized APF (fAPF) technique for non-minimum phase models is presented to suggest a simple solution.
Abstract: One of the problems of the inverse model-based control techniques is the stability of the identified inverse model after the estimation process by the recursive least square (RLS) method. One solution is to use the all pass filtering (APF) technique to transform non-minimum phase models into minimum phase models [9]. However, there are several cases not cured by the all pass filtering method when the all pass filter algorithm is implemented on the hardware. In this paper, an improved version of the all pass filtering technique is presented to deal with the non-minimum phase models. The factorized APF (fAPF) technique for non-minimum phase models is presented to suggest a simple solution. A simple method for avoiding the calculation of complex numbers is also presented for the easy implementation. Several examples are given to support the proposal.
6 citations
TL;DR: Simulations reveal that the proposed Blaschke interpolation based all-pass filter design is able to produce filters that closely match the target phase response accurately with much lower complexity than prior approaches.
Abstract: Obtaining a rational all-pass filter that matches a target phase response is a common problem in signal processing. Typical approaches have generally focused on optimizing filter coefficients while minimizing the deviation from the target phase response. However, these approaches typically do not offer a guarantee of exact match of the phase or any conditions on group delay. In this letter, we propose a Blaschke interpolation based all-pass filter design, wherein, if the phase response is known at $n$ distinct frequencies, an all-pass filter that exactly satisfies the target values can be obtained. Moreover, the group delay at the interpolating points can be optimized or tuned to control the phase response for remaining frequencies. Simulations reveal that the design method is able to produce filters that closely match the target phase response accurately with much lower complexity than prior approaches.
6 citations
Additional excerpts
...APFs[5] are used in digital reverberators....
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01 Dec 2018
TL;DR: In this paper, the authors proposed a triple-band hexagonal-spiral (HS) band-pass filter for GSM 900 MHz and WLAN (2.4 GHz) applications.
Abstract: In this communication, multi-wideband micro-strip Hexagonal-Spiral (HS)band-passfilter is presented. The proposed multiband band-pass filterconsists of four spiral shunt quarter-wavelength short-circuited stubs separated by connecting lines with length of $\boldsymbol{\lambda}\mathbf{g}/2$ and $\boldsymbol{\lambda}\mathbf{g}/4$ , respectively. Appropriate transmission zeros are generated to isolate the bands of proposed band-pass filter, as desired. From the simulated results, the offered wide bandwidth observed for dual band-pass filter is 240 MHz (0.8 GHz to 1.04 GHz) and 250 MHz (1.18 GHz to 1.43 GHz). The bandwidth for the proposed triple band pass filter are 220 MHz (0.64 GHz to 0.86 GHz), 100 MHz (1.38 GHz to 1.48 GHz), and 400 MHz (2.31 GHz to 2.71 GHz). The triple band HS filter is fabricated and tested with network analyzer. The measured results are in good agreement with the simulation results. These filters are suitable for GSM 900 MHz and WLAN (2.4 GHz) applications.
4 citations