• Title/Summary/Keyword: Matching frequency

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An improved block matching algorithm for fast motion estimation (고속 움직임 추정을 위한 개선된 블록 정합 방식)

  • 문용호
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.28 no.5C
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    • pp.539-547
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    • 2003
  • According to the PDE scheme, it is desirable to make the value of SAD to be rapidly increased in motion estimation. In this paper, we propose a new block matching algorithm based on the combination of a new scan and search order. In the proposed scan order, a current block is divided by the frequency that is estimated by summing the difference between the mean and the values of the pixels. And then the calculation of SAD is performed from the highest frequency area. In the proposed search order based on DC difference between the current and the candidate block, candidate blocks with low DC are early checked in motion estimation. Simulation results show that the proposed method achieves about 6% computational gain compared with the conventional methods.

A Study on Design and Fabrication Method of Tap-Offs with Broad-Band Characteristics of for CATV Systems (CATV 시스템용 광대역 특성을 가지는 신호분기기의 설계 및 제작법에 관한 연구)

  • ;;高橋道;石川朝;小峰仁(H. Komine)
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.9 no.3
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    • pp.399-409
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    • 1998
  • In this paper, the broad-band design theory for weakly-coupled Tap-Off for CATV systems has been described and the transmission line impedance matching method has been proposed. The fabricated weakly-coupled Tap-Offs based on the above theory and method have been much improved in the frequency characteristics compared with conventional ones. Thus, the useful bandwidth of weakly-coupled Tap-Offs have been extended from 5 to 2000 MHz. It is also recognized that turn numbers of the coils composing the transformer are not integers but 0.9, 1, 1.9, 2, 2.9, etc., in the actual circuits. Further, the practical measurements of the frequency characteristics for a fabricated weakly-coupled Tap-Off show very good agreements with theoretical results, and hence, the validity of the proposed design theory and transmission line impedance matching method have been confirmed.

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A Study on Digital Sound Source based LED Color Matching Algorism using Moving Average Filter (이동평균 필터방식을 이용한 디지털음원 기반 LED컬러 매칭 알고리즘에 관한 연구)

  • Lee, Seonhee;Lee, Junghoon;Cho, Juphil
    • Journal of Satellite, Information and Communications
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    • v.9 no.4
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    • pp.69-72
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    • 2014
  • Recently, lighting systems using audio signal of audible frequency and frequency spectrum of visible lighting are studied. And various related products are being sold and released commercially. Also demands of emotional matching algorithm and system which includes effective and methodical designs are being increased. And the importance related with this scheme has increased. In this Paper, we configures a system for digital sound source based LED color control. And we develop algorithm to control LED color for the system configuration. Also we demonstrated the usefulness of the algorithm through experiment with simulation using LED color control system. We expected to be useful in a variety of fields and applications using proposed digital music based LED color control system.

Thai Classical Music Matching Using t-Distribution on Instantaneous Robust Algorithm for Pitch Tracking Framework

  • Boonmatham, Pheerasut;Pongpinigpinyo, Sunee;Soonklang, Tasanawan
    • Journal of Information Processing Systems
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    • v.13 no.5
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    • pp.1213-1228
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    • 2017
  • The pitch tracking of music has been researched for several decades. Several possible improvements are available for creating a good t-distribution, using the instantaneous robust algorithm for pitch tracking framework to perfectly detect pitch. This article shows how to detect the pitch of music utilizing an improved detection method which applies a statistical method; this approach uses a pitch track, or a sequence of frequency bin numbers. This sequence is used to create an index that offers useful features for comparing similar songs. The pitch frequency spectrum is extracted using a modified instantaneous robust algorithm for pitch tracking (IRAPT) as a base combined with the statistical method. The pitch detection algorithm was implemented, and the percentage of performance matching in Thai classical music was assessed in order to test the accuracy of the algorithm. We used the longest common subsequence to compare the similarities in pitch sequence alignments in the music. The experimental results of this research show that the accuracy of retrieval of Thai classical music using the t-distribution of instantaneous robust algorithm for pitch tracking (t-IRAPT) is 99.01%, and is in the top five ranking, with the shortest query sample being five seconds long.

Electrical Variable Capacitor based on Symmetrical Switch Structure for RF Plasma System (대칭적인 스위치 구조 기반 RF 플라즈마 시스템 적용 전기적 가변 커패시터)

  • Min, Juhwa;Chae, Beomseok;Kim, Hyunbae;Suh, Yongsug
    • The Transactions of the Korean Institute of Power Electronics
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    • v.24 no.3
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    • pp.161-168
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    • 2019
  • This study introduces a new topology to decrease the voltage stress experienced by a 13.56 MHz electrical variable capacitor (EVC) circuit with an asymmetrical switch structure applied to the impedance matching circuit of a radio frequency (RF) plasma system. The method adopts a symmetrical switch structure instead of an asymmetrical one in each of the capacitor's leg in the EVC circuit. The proposed topology successfully reduces voltage stress in the EVC circuit due to the symmetrical charging and discharging mode. This topology can also be applied to the impedance matching circuit of a high-power and high-frequency RF etching system. The target features of the proposed circuit topology are investigated via simulation and experiment. Voltage stress on the switch of the EVC circuit is successfully reduced by more than 40%.

High Output Power and High Fundamental Leakage Suppression Frequency Doubler MMIC for E-Band Transceiver

  • Chang, Dong-Pil;Yom, In-Bok
    • Journal of electromagnetic engineering and science
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    • v.14 no.4
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    • pp.342-345
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    • 2014
  • An active frequency doubler monolithic microwave integrated circuit (MMIC) for E-band transceiver applications is presented in this letter. This MMIC has been fabricated in a commercial $0.1-{\mu}m$ GaAs pseudomorphic high electron mobility transistor (pHEMT) process on a 2-mil thick substrate wafer. The fabricated MMIC chip has been measured to have a high output power performance of over 13 dBm with a high fundamental leakage suppression of more than 38 dBc in the frequency range of 71 to 86 GHz under an input signal condition of 10 dBm. A microstrip coupled line is used at the output circuit of the doubler section to implement impedance matching and simultaneously enhance the fundamental leakage suppression. The fabricated chip is has a size of $2.5mm{\times}1.2mm$.

Ultra-small Marker Beacon Antenna with a Wide Frequency Tuneable Capacitive Plate

  • Park, Ju-Derk;Choi, Byeong-Cheol;Kim, Nam;Jung, Young-Bae
    • ETRI Journal
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    • v.38 no.5
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    • pp.879-884
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    • 2016
  • In this paper, an ultra-small marker beacon antenna operated in the VHF-band is proposed. This antenna has a modified linear IFA structure with a lumped capacitor and a capacitive plate for frequency tuning and impedance matching. The capacitive plate is directly connected to the end of a linear radiator and is separated from the antenna ground by 1 mm. The main operating frequency is mainly controlled by the size and dielectric constant of the capacitive plate. The lumped capacitor is useful for fine frequency tuning. Using the proposed structure, an ultra-small marker beacon antenna can be realized with a length of 0.04 ${\lambda}_0$.

Graphene Reconfigurable Antenna for GPS and Iridium Applications

  • Salem GAHGOUH;Ali GHARSALLAH
    • International Journal of Computer Science & Network Security
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    • v.23 no.3
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    • pp.203-207
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    • 2023
  • A frequency reconfigurable antenna based on graphene and used for multi-band wireless communications is presented in this article. The proposed antenna, which consists of two radiating rectangular loops with a graphene extension, is analyzed for Global Positioning System (GPS) and Iridium applications. Its operating frequency is tuned through the implementation of a layer of graphene and thereby adjusting the applied gate bias. Furthermore, the results show a novel use of graphene for microwave frequencies while achieving a frequency reconfiguration with an improvement of the impedance matching and the gain. The results also prove the importance of graphene, with its exceptional properties, for a promising future in nano-electronics.

A Study on the Broadband Microwave Amplifier Design Using Potentially Unstable GaAs FET (Potentially Unstable한 GaAs FET를 이용한 광대역 마이크로파증폭기에 관한 연구)

  • Hong, Jae-Pyo;Cho, Young-Ki;Son, Hyon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.12 no.1
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    • pp.19-26
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    • 1987
  • The broadband microwave amplifier in the 3~4GHz frequency range has been designed by using potentially unstable GaAs FET. Input matching network is designed by 14dB available power gain circles which are in the stable region. In order to obtain maximu, transducer power gain, output matching network which is in the stable region can be designed using Fano's bandpass matching network. The measured values of transducer power gain, $S_11$and $S_22$ show close agreements with the theoretical valuse.

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Analysis of Scattering Characteristics of a Rectangular Waveguide with Conducting Half Cylinders using the Mode Matching Method (모드매칭법을 이용한 금속의 Half Cylinder가 있는 구형 도파관의 산란 특성 해석)

  • 김원기;천동완;김상태;신철재
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.8A
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    • pp.962-971
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    • 2004
  • In this paper, we present the numerical analysis method for analyzing scattering characteristics of a rectangular waveguide with the conducting half cylinder using the mode matching method and compute scattering characteristics of a waveguide according to the rotation and changing radius of the half cylinder. Also, in conjunction with the generalized scattering method, the proposed method can be easily applied to a rectangular waveguide with cascade structure of conducting half cylinders. From the simulated result of a two pole filter, resonance frequency could be controlled by the rotation of half cylinders. The simulated result shows good agreement with the HFSS's result. The proposed structure and analysis method are easily applied to the design of waveguide components with conducting half cylinders.