Results 261 to 270 of about 555,673 (291)

Noise reduction for 3-D IIR digital filters with discrete error feedback coefficients

48th Midwest Symposium on Circuits and Systems, 2005., 2005
In this paper, we propose a new design method for error feedback (EF) with discrete coefficients in order to reduce the roundoff noise in 3-D IIR digital filters. The lower bound estimation principle is used so that finding the optimum solution. Using the proposed method, the EF designed by the proposed method has guaranteed optimality.
Masayoshi Nakamoto, Tsuyoshi Yoshiya, Takao Hinamoto   +2 more
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Error feedback for noise reduction in 2-D digital filters with quadrantally symmetric or antisymmetric coefficients

Proceedings of 1997 IEEE International Symposium on Circuits and Systems. Circuits and Systems in the Information Age ISCAS '97, 2002
A novel method of applying the error feedback with quadrantally symmetric or antisymmetric coefficients in two-dimensional recursive digital filters is proposed. In order for the error feedback coefficients to be represented by the set of integers, the output noise variance of the filter is discretely optimized by using the depth-first-search strategy ...
Takao Hinamoto, Naoki Kuroda, T. Kuma
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Analysis of neural networks efficiency when accounting for weight coefficients jitter, leading to reduction in output signal/noise ratio

Neurocomputers, 2021
Setting up artificial neural networks using iterative algorithms is accompanied by fluctuations in weight coefficients. When an artificial neural network solves the problem of allocating a useful signal against the background of interference, fluctuations in the weight vector lead to a deterioration of the useful signal allocated by the network and, in
S. V. Zimina
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Functions for noise reduction in acoustic standards: evaluating reverberation time, mean absorption coefficient, and a novel approach

INTER-NOISE and NOISE-CON Congress and Conference Proceedings
Contemporary European acoustic standards utilize dimensioning functions based on either reverberation time or mean absorption coefficient. For spaces with the primary goal of noise reduction, achieving consistent overall sound pressure level (SPL) reduction, regardless of room sizes and shapes is evidently desirable.
Thomas Ziegler
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Analysis and prediction of the noise reduction coefficient of lightly-needled Estabragh/polypropylene nonwovens using simplex lattice design

The Journal of The Textile Institute, 2013
This work aims to predict the noise reduction coefficient (NRC) of nonwoven layers produced from Estabragh/polypropylene blends of fibers. Estabragh is a natural hollow fiber which can be expected to have excellent sound insulation properties. In addition to the investigation of Estabragh’s unique properties in association with the sound absorption ...
Sanaz Hassanzadeh, Hossein Hasani, Mohammad Zarrebini   +2 more
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Image Noise Reduction in Computed Tomography with Non-Local Means Algorithm Based on Adaptive Filtering Coefficients

Acta Optica Sinica, 2020
蔡玉芳 Cai Yufang, 陈桃艳 Chen Taoyan, Jue Wang, 姚功杰 Yao Gongjie   +3 more
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Spaced object absorbers, sound absorption coefficients, and the noise reduction coefficient rating in architecture

The Journal of the Acoustical Society of America, 2021
Spaced object arrays (e.g., vertical baffles) are a growing trend for reverberation time reduction in architectural spaces. Unfortunately, the acoustical considerations for these products are significantly more complex than traditional continuous ceiling treatments.
openaire   +1 more source

Neural Networks and Support Vector Regression Models to Evaluate Energy Efficiency-Noise Reduction Coefficient Correlation

2025 International Conference on Circuit, Systems and Communication (ICCSC)
Rachid Lagtayi, Lamya Lairgi, Yassir Lairgi, Ahmed Khouya, Abdelmajid Daya   +4 more
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Examples of optimal noise reduction filters derived from the squared Pearson correlation coefficient

2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2014
This paper studies the problem of single-channel noise reduction in the time domain. Based on some orthogonal decomposition developed recently and the squared Pearson correlation coefficient (SPCC), several noise reduction filters are derived. We will show that the optimization of the SPCC leads to the Wiener, minimum variance distortionless response ...
Jiaolong Yu, Jacob Benesty, Gongping Huang, Jingdong Chen   +3 more
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Noise reduction in seismic data using Fourier correction coefficient filtering

GEOPHYSICS, 1997
The correlation coefficient between two frequency (or two wave number) componets equals the cosine of their phase‐angle difference. This relation can be exploited to build a filter that separates noise from signal in seismic data in either the F‐X or F-K domain (termed “correlation coefficient filtering”).
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