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Performance Analysis of an Inverse Notch Filter and Its Application to <i>F<sub>0</sub></i>Estimation

Circuits and Systems 2013年第1期4卷 117-122页

作者： Yosuke Sugiura arata kawamura Youji Iiguni Graduate School of Engineering Science Osaka University Osaka Japan

In this paper, we analyze an inverse notch filter and present its application to F0 (fundamental frequency) estimation. The inverse notch filter is a narrow band pass filter and it has an infinite impulse response. We derive the explicit forms for the impulse response and the sum of squared impulse response. Based on the analysis result, we derive a normalized inverse notch filter whose pass band area is identical to unit. As an application of the normalized inverse notch filter, we propose an F0 estimation method for a musical sound. The F0 estimation method is achieved by connecting the normalized inverse notch filters in parallel. Estimation results show that the proposed F0 estimation method effectively detects F0s for piano sounds in a mid-range.

关键词： Band Pass Filter Inverse Notch Filter Impulse Response Analysis

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An Adaptive Howling Canceller Using 2-Tap Linear Predictor

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Circuits and Systems 2013年第1期4卷 6-10页

作者： Akira Sogami Yosuke Sugiura arata kawamura Youji Iiguni Department of Systems Innovation Graduate School of Engineering Science Osaka University Toyonaka Japan

This paper proposes an adaptive howling canceller using notch filter and 2-tap linear predictor, where howling consists of a single sinusoidal signal whose magnitude is much greater than other frequency’s magnitudes. The employed 2-tap linear predictor can quickly detect howling due to its high convergence speed. Although the output signal of the 2-tap linear predictor cannot be directly used as one of a howling canceller, we can obtain the frequency of howling from the filter coefficient. We utilize the filter coefficient of the 2-tap linear predictor to design a notch filter which achieves a very narrow elimination band. The designed notch filter removes only howling and retains other desired signals. Simulation results show that the proposed adaptive howling canceller can quickly detect and effectively remove howling.

关键词： Howling Canceller Linear Predictor Notch Filter Single Sinusoidal Signal Convergence Speed

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Effects of the Produced Water from a Sour Oilfield in South Kuwait on the Production Tubing

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Journal of Water Resource and Protection 2023年第7期15卷 358-375页

作者： Feras Al Salem Vijo Poulose Kazuyuki kawamura arata Nakamura Hakim Saibi Thies Thiemann Department of Biology College of Science United Arab Emirates University Al Ain United Arab Emirates Department of Chemistry College of Science United Arab Emirates University Al Ain United Arab Emirates Technology and Research Center Japan Organization for Metals and Energy Security (JOGMEC) Chiba Japan Department of Geosciences College of Science United Arab Emirates University Al Ain United Arab Emirates

Kuwaiti oil production faces a growing challenge in the increasing quantities of produced water generated in the production of oil. The high water cut of the produced fluid from the wells and the high salinity of the produced water lead to significant degradation of subsurface equipment, specifically the production tubing. Debris generated through the degradation of the inner part of the tubing becomes a constituent of the scaling that deposits in the tubing and blocks the flow of the production fluid, inducing higher maintenance costs. This paper looks at the characteristics of the scaling in regard to the produced water and outlines the economic impact of the produced water induced degradation of the tubing structure.

关键词： Produced Water Scaling Production Tubing Corrosion SEM-EDS WD-XRF XPS

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