scispace - formally typeset
Search or ask a question
Topic

Impulse noise

About: Impulse noise is a research topic. Over the lifetime, 4816 publications have been published within this topic receiving 63970 citations.


Papers
More filters
Patent
18 Dec 2000
TL;DR: In this paper, an impulse noise reducer detects impulse noise in an audio signal by detecting and smoothing the high-frequency amplitude of the audio signal, attenuating the non-smoothed amplitude according to the smoothed amplitude, and comparing the attenuated amplitude with a threshold.
Abstract: An impulse noise reducer detects impulse noise in an audio signal by detecting and smoothing the high-frequency amplitude of the audio signal, attenuating the non-smoothed amplitude according to the smoothed amplitude, and comparing the attenuated amplitude with a threshold. Impulse noise is discriminated from high-frequency audio components because the latter tend to occur in longer-lasting bursts and are therefore attenuated more strongly. The impulse noise reducer is simplified because it does not have to perform intermediate-frequency signal processing, and its sensitivity is not affected by adjacent-channel signals because these signals are substantially absent from the audio signal. The impulse noise reducer can be implemented by digital signal processing, and is suitable for use in a medium-wave AM audio broadcast receiver.

34 citations

Journal ArticleDOI
Sami Barmada1, Antonino Musolino1, Marco Raugi1, Rocco Rizzo1, Mauro Tucci1 
TL;DR: The aim of this paper is to study the problem of load-time variation in power line communication (PLC) systems and to analyze asynchronous impulsive noise and related channel variations due to switch commutations by using a numerical model of the time-varying communication channel developed by using scattering parameters in the wavelet domain.
Abstract: The aim of this paper is to study the problem of load-time variation in power line communication (PLC) systems and to analyze asynchronous impulsive noise and related channel variations due to switch commutations. A numerical model of the time-varying communication channel is developed by using scattering parameters in the wavelet domain. The proposed method uses the N-port description of the elements that constitute a time-varying PLC system in terms of real matrices with constant elements. This represents a valid alternative to the time domain description usually adopted for analyzing time-varying networks. The comparison with results obtained from other numerical models and with experimental data has confirmed the accuracy and the efficiency of the proposed method.

34 citations

Proceedings ArticleDOI
03 Nov 2011
TL;DR: In this article, a methodology based on median filters for the removal of salt and pepper noise by its detection followed by filtering in both binary and gray level images has been proposed in order to preserve the edges and fine details during filtering.
Abstract: A methodology based on median filters for the removal of Salt and Pepper noise by its detection followed by filtering in both binary and gray level images has been proposed in this paper. Linear and nonlinear filters have been proposed earlier for the removal of impulse noise; however the removal of impulse noise often brings about blurring which results in edges being distorted and poor quality. Therefore the necessity to preserve the edges and fine details during filtering is the challenge faced by researchers today. The proposed method consists of noise detection followed by the removal of detected noise by median filter using selective pixels that are not noise themselves. The noise detection is based on simple thresholding of pixels. Computer simulations were carried out to analyse the performance of the proposed method and the results obtained were compared to that of conventional median filter and center weighted median (CWM) filter.

34 citations

Journal ArticleDOI
TL;DR: These two schemes, namely, clustered simple polling and neighbor relay polling, are shown to be typically effective and efficient AMR schemes for overcoming the “silent node” problem associated with AMR systems.
Abstract: This paper presents analytical models to study the performances of two schemes for automatic meter-reading (AMR) systems using power-line-communication (PLC)-access networks. These two schemes, namely, clustered simple polling and neighbor relay polling, are shown to be typically effective and efficient AMR schemes for overcoming the “silent node” problem associated with AMR systems. The analytical models also present the analysis of two different topological structures, radial and tree, of the PLC-access network assuming an automatic three-level clustering mechanism. The performances of the AMR schemes in terms of data-collection delay and throughput under impulsive noise interference are analyzed. The models are used to study the optimum packet size and data rate to mitigate the effect of impulsive noise on AMR system performance. Through comparison of the analytical results with the simulation results, it is verified that the analytical models have been accurately developed.

34 citations

Journal ArticleDOI
TL;DR: It is demonstrated that the impulse noise generated from clipping AM signals limits QAM bit-error performance in AM-VSB/M-QAM hybrid optical transmission systems.
Abstract: We demonstrate that the impulse noise generated from clipping AM signals limits QAM bit-error performance in AM-VSB/M-QAM hybrid optical transmission systems. A new technique is developed to adequately predict QAM bit-error rate by defining a measurable parameter which can be obtained from impulse counting using a standard spectrum analyzer. >

34 citations


Network Information
Related Topics (5)
Wireless
133.4K papers, 1.9M citations
72% related
Fading
55.4K papers, 1M citations
71% related
Communications system
88.1K papers, 1M citations
71% related
Feature extraction
111.8K papers, 2.1M citations
70% related
Wireless sensor network
142K papers, 2.4M citations
69% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202371
2022168
2021111
2020175
2019206
2018210