• Title/Summary/Keyword: 필터의 길이

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A Study on Speaker Normalization using VTN (VTN을 이용한 화자 정규화에 관한 연구)

  • 손창희;손종목;배건성
    • Proceedings of the IEEK Conference
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    • 2001.09a
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    • pp.499-502
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    • 2001
  • 본 연구에서는 화자에 따라 서로 다른 성도의 길이에 의해 발생하는 음성인식 시스템의 성능 저하를 줄이기 위하여, VTN(Vocal Tract Normalization)을 음성인식 시스템에 적용하고, 주소 인식 실험을 통하여 인식 성능을 평가하였다. 또, VTN을 CMN과 동시에 적용하여 인식 실험을 하였다. 실험에서는 화자간 성도길이의 차이를 반영하기 위하여 13개의 Warping 계수에 대해 필터 뱅크를 이용한 선형 Warping 방법을 적용하였다. 실험결과, Baseline 인식 시스템에 비하여 VTN을 적용하면, WER(Word Error Rate)이 1.24% 감소하였고, CMN과 VTN을 동시에 적용한 실험에서는 Baseline 인식 시스템과 비교하여 WER이 0.33% 감소 하였지만 VTN을 적용한 실험결과와 비교하면 오히려 0.91% 증가하였다.

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The Intrusion sensor using the variations of speckle patterns (스페클 패턴을 이용한 침입자 센서)

  • Park, Jae Hui;Gang, Sin Won
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.38 no.3
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    • pp.82-82
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    • 2001
  • 스페클 패턴은 다중모드 광섬유 내를 전파하는 모드 사이의 간섭현상 때문에 발생하는 검은 무늬로서, 외부 섭동 (perturbation)의 크기에 따라 패턴이 바뀌게 된다. 이 현상을 이용하여 본 연구에서는 스페클 센서를 제작하여 실험을 통해 시설물을 원거리, 실시간 원격 감시가 가능하고 매우 민감한 침입자 센서로 응용 가능함을 확인하였다. 본 연구에서는 감도를 높이고 구조를 간단하게 하기 위해, 공간필터를 사용하는 대신 광검출기 홀더를 길이 가변이 가능하도록 지그를 제작하여 사용하였으며, 정류기와 FVC를 사용하여 외부 섭동의 지속시간과 크기를 알 수 있었다.

A Coaxial Band Rejection Filter using a Quarter Wavelength Choke Structure (4분의 1 파장 초크 구조를 이용한 동축형 대역억제필터)

  • Han, Dae Hyun
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.11 no.3
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    • pp.313-318
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    • 2018
  • A coaxial band rejection filter is designed and fabricated for a beam interacting cavity. The proposed filter has a quarter wavelength choke for the dominant mode of the cavity. The equivalent circuit of the coaxial band rejection filter is presented and the ABCD parameter os each part is derived to obtain the ABCD parameter of the entire filter. The scattering matrix was obtained from the ABCD matrix and the was simulated by MATLAB using the obtained scattering matrix. The coaxial band rejection filter structure was simulated using HFSS, and the results confirmed the simulation using the equivalent circuit was useful. The designed coaxial band rejection filter was fabricated with 6-1/8 flange. The fabricated filter was measured using a transition from 6-1/8 flange to N-type flange. The insertion loss of the fabricated filter is greater than 25 dB in the dominant mode of the cavity and less than 0.25 dB in the first higher order mode. The measurement results are in good agreement with the simulated results and meet the design specification.

Pipelining of orthogonal Double-Rotation Digital Lattice Filters for High-Speed and Low-Power Implementation (고속 및 저파워 실현을 위한 직교 이중 회전 디지털 격자 필터의 파이프라인화)

  • 정진균;엄경배
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.19 no.12
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    • pp.2409-2417
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    • 1994
  • The ODR(orthogonal double-rotation) digital lattice filters have desirable properties for VLSI implementation such as local connection, regularity and pipelinability. These filters are also known to exhibit good numerical behavior for finite precision implementation. Although these filters can be pipelined by the cut-set localization procedure, it should be noted that the maximum sample rate obtained by this technique is limited by the feedback computations. In this paper, a pipelining method for the ODR digital lattice filter is proposed, by which the sample rate can be increased at any desired level. it is also shown that the low-power CMOS digital implementation of ODR digital lattice filters can be done successfully using our pipelining method. The pipelining method is based on the properties of the Schur algoithm, constrained filter design methods, and the polyphase decomposition technique.

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Analysis of Broad- Band Grating Filter Response in Integrated Optics (집적 광학용 광대역 격자 필터의 해석)

  • 김언균;신상균
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.19 no.6
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    • pp.55-61
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    • 1982
  • An analytic solution for the spectral response of linearly-chirped grating filter is derived, which takes the finite physical length of filter into account. In the usual case of broad-band linearly-chirped grating filter the analytic solution is expressed in terms of elementary functions, by approximating asymptotically the involved parabolic cylinder functions over different ranges of its argument. It is also shown that derived results are general enough to include previously-available approximations as particular cases, and that they agree well with the numerical solutions based upon the Runge-Kutta method.

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Partial H-plane Filter with Periodic Structure (주기 구조를 이용한 Partial H-plane Filter)

  • Kim Dong-Jin;Chung Woo-Sung;Lee Jeong-Hae
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.17 no.8 s.111
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    • pp.746-752
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    • 2006
  • In this paper, a compact partial H-plane filter with periodic structure is proposed. Guided wavelength of periodic structure' is reduced by slow wave effect. Cross-section and length of partial H-plane filter with periodic structure are considerably reduced by 75% and 30%, respectively, as compared with conventional E-plane filter. In addition, spurious responses of the bandpass filter are improved. To design bandpass filter with periodic structure, we have analyzed a periodic structure of partial H-plane waveguide and derived equations of the periodic filter. Measured results are in good agreement with simulated results.

A Design of Current-Mode Analog FIR Filter for Wireless Home Network (주파수가변형 무선PAN단말을 위한 전류모드 아날로그 FIR 필터의 설계)

  • Kim, Seong-Kweon;Kim, Kwang-Ho;Cho, Ju-Phil;Cha, Jae-Sang
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.10
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    • pp.35-40
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    • 2006
  • In this paper, a current-mode analog variable finite-impulse-response (FIR) filter with variable tap coefficient circuits is proposed for frequency selective wireless personal area network(WPAN) system or terminals. From the circuit simulation the operation of the 7-tap FIR filter is confirmed. The 0.0625-step tap coefficient circuit is designed and fabricated with $0.8[{\mu}m]$ CMOS technology. The proposed FIR filter has a variable length of taps and variable coefficients, so it has a potential for being used to frequency selective WPAN system or frequency selective wireless communication terminals.

Extended Target State Vector Estimation using AKF (적응형 칼만 필터를 이용한 확장 표적의 상태벡터 추정 기법)

  • Cho, Doo-Hyun;Choi, Han-Lim;Lee, Jin-Ik;Jeong, Ki-Hwan;Go, Il-Seok
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.43 no.6
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    • pp.507-515
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    • 2015
  • This paper proposes a filtering method for effective state vector estimation of highly maneuvering target. It is needed to hit the point called 'sweet spot' to increase the kill probability in missile interception. In paper, a filtering method estimates the length of a moving target tracked by a frequency modulated continuous wave (FMCW) radar. High resolution range profiles (HRRPs) is generated from the radar echo signal and then it's integrated into proposed filtering method. To simulate the radar measurement which is close to real, the study on the properties of scattering point of the missile-like target has been conducted with ISAR image for different angle. Also, it is hard to track the target efficiently with existing Kalman filters which has fixed measurement noise covariance matrix R. Therefore the proposed method continuously updates the covariance matrix R with sensor measurements and tracks the target. Numerical simulations on the proposed method shows reliable results under reasonable assumptions on the missile interception scenario.

Influence of the Parameters of a Heater Array Inducing a Thermo-optic Long-period Grating on its Power Consumption (열광학 장주기 격자를 유도하는 히터 배열의 인자들이 파워 소모에 미치는 영향)

  • Kwon, Min-Suk
    • Korean Journal of Optics and Photonics
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    • v.19 no.4
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    • pp.315-319
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    • 2008
  • We investigate theoretically the power consumption of a notch filter using a thermo-optic long-period grating, which is induced by a heater array consisting of periodic heaters and pads made of metal thin-film. Since the power consumed by the heater array is converted to joule heat that generates the thermo-optic long-period grating, the characteristics of the notch filter are dynamically controlled by adjusting it. The power necessary for appropriate coupling efficiency depends on the parameters of the heater array, which are the width and length of a heater, pad width, and the thickness of the thin-film. We explain an approximate method of analyzing the influence of the parameters on the consumed power. Using the analysis method, we simulate the change of the power depending on the parameters. From the simulation, we suggest a few guidelines on the parameters required to reduce the power.

Finding the true length of a line and an ellipse from optical Hough transform results (광학적 Hough변환 결과로부터 직선과 타원의 실제 길이 추출)

  • Park, Sang-Guk;Kim, Seong-Yong;Kim, Su-Jung
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.37 no.3
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    • pp.39-47
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    • 2000
  • In this paper, we propose a new method of finding the true length of the line and long axis of the ellipse at the $\theta$=$\theta$o+ 90$^{\circ}$ and short axis of the ellipse at the $\theta$ = $\theta$o from the Hough transform (HT) results. Through the simulations, we showed that the true length of the line and ellipse could be obtained with 98 % accuracy by using the distance from the maximum envelope to the minimum envelope. To compare the simulation results with the experimental results, we performed optical experiments by using a HT CGH filter. Through the experiments, we showed that our results were very similar to those of the simulation.

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