• Title, Summary, Keyword: 놋치 필터

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A New Approach to the Maximum Dynamic Range of the High Order Band-Pass and Band-Reject Elliptic Filters (고차 대역통과 및 대역저지 타원 필터의 최대 동적구역을 실현하기 위한 새로운 접근법)

  • 박민식;이문호;김동용
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.10 no.5
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    • pp.250-257
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    • 1985
  • High order filters are usually realized by cascading second order stages. In this paper, a simple method of pole-zero pairing in the high order band-pass and band-reject filter realization of the elliptic functions is proposed for the enhancement of overall dynamic range. Futrhermore, the optimum sequence of the various biquads of high-pass notch, low-pass notch and symmetrical notch etc., is developed for the elliptic band-pass and band-reject filters.

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Representation of Serially Sectioned Images of Entire Human Body by Improvement of Notch Filter (놋치 필터 개선을 통한 인체 연속절단 영상 재현)

  • Park, Ki-Seok;Har, Dong-Hwan
    • The Journal of the Korea Contents Association
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    • v.11 no.5
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    • pp.15-24
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    • 2011
  • Recently various anatomic researches by using serially sectioned images in VK(Visible Korean) project are in progress. In that sense, it is very important and necessary to represent images which keep information of the original anatomic images. In this regard, there are some studies to get rid of slice patterns in coronal and sagittal images. However, according to the rapid spatial frequency changes, the ringing effect occurred in common. In addition, because of merge with the original images which have splice patterns, those patterns appeared again. Therefore, in this study we found effective color space to apply to FFT(Fast Fourier Transform) and notch filter in getting rid of the slice patterns. To verify this, we used RGB, LAB, CMYK, HSV and HSL color space. Secondly we got rid of and alleviated the ringing effect by improving notch filter. To verify this, we compared proposed method with previous study on the basis of original images by visual method and objective values. These result images are expected to contribute to anatomy research in relation to VK project.

Tracking Heart Rate Algorithm Based on PPG (PPG 기반 심박동수 추정 알고리즘)

  • Baek, Yong Hyun;Lee, Keun Sang;Park, Young Chul
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.2 no.3
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    • pp.71-78
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    • 2009
  • In this study, estimation of heart rate from measured PPG signal is proposed. PPG signal is to be measured blood flow in a blood vessel effected by systole and diastole. PPG sianl has single frequency so that PPG frequency can be tracked by 2nd IIR adaptive notch filter. PPG frequency is obtained continually from updating filter coefficient throughout adaptive algorithm and then the heart rate of human is approximately estimated.

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The Design of the Ultra-Wideband Slot Antenna by Using a Semi-Circular Extension (반원 확장을 이용한 초광대역 슬롯 안테나 설계)

  • Lee Jung-Nam;Lee Hyo-Kyoung;Jang Hwa-Yeol;Park Jong-Kweon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.16 no.9
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    • pp.941-948
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    • 2005
  • In this paper, we have proposed a Ultra-Wideband slot notch antenna by using a semi-circular extension. The proposed antenna cover the entire UWB band(3.1${\~}$10.6 GHz) and notch out the IEEE 802.1la frequency band(5.15${\~}$5.825 GHz) by inserting a $\lambda$/4 length slot into the patch. A prototype antenna was fabricated on FR-4( ${\epsilon}_r$ =4.4, substrate thickness=0.8 mm) and measured for VSWR characteristics. The measured notched frequency variations versus frequency for different slot length. The path loss and group delay were measured. The proposed antenna also show a good gain flatness(1.9 dBi) except the IEEE 802.1la frequency band.