• Title/Summary/Keyword: Digital structure design

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Distributed Arithmetic Adaptive Filter Structure for Low-power Digital Hearing Aid Processor Implementation (저전력 디지털 보청기 프로세서 구현을 위한 Distributed Arithmetic 적응 필터 구조)

  • 장영범;이원상;유선국
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.53 no.9
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    • pp.657-662
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    • 2004
  • The low-power design of the digital hearing aid is indispensable to achieve the compact portable device with long battery duration. In this paper, new low-power adaptive filter structure is proposed based on distributed arithmetic(DA). By modifying the DA technique, the proposed decimation filter structure can significantly reduce the power consumption and implementation area. Through Verilog-HDL coding, cell occupation of the proposed structure is reduced to 33.49% in comparison with that of the conventional multiplier structure. Since Verilog-HDL simulation processing time of the two structures are same, it is assumed that the power consumption or implementation area is proportional to the cell occupation in the simulation.

Development of the Digital Controller for High Precision Digital Power Supply (고정밀전원장치를 위한 디지털 제어기 개발)

  • Ha, K.M.;Lee, S.K.;Kim, Y.S.
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2006.06a
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    • pp.249-250
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    • 2006
  • In this paper, hardware design and implementation of digital controller for the High Precision Digital Power Supply (HPDPS) based on Digital Signal Processor (DSP) and Field Programmable Gate Array (FPGA) is presented. Developed digital controller is composed of high resolution Digital Pulse Width Modulation (DPWM) and high resolution analog to digital converter circuit with anti-aliasing filter. And Digital Signal Processor (DSP) has the capability of a few micro-second calculation time for one feedback loop. 32-bit DSP and DPWM with 150[ps] step resolution is used to implement the HPDPS. Also 18-bit 2 mega sample per second ADC board is adopted for the developed digital controller. Also, hardware structure of the developed digital controller and experimental results of the first prototype board for HPDPS is described.

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The Design of Digital Audio Interpolation Filter (디지털 오디오용 보간 필터 설계)

  • 이정웅;신건순
    • Proceedings of the IEEK Conference
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    • 2000.11a
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    • pp.93-96
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    • 2000
  • This paper has been proposed an audio DAC structure composed of FIRs and IIR filters as digital interpolation filter to integrate the off-chip analog low-pass filter on-a-chip. The passband ripple(< 0.41${\times}$fs), passband attenuation(at 0.41${\times}$fs) and stopband attenuation(> 0.59${\times}$fs) of the Δ$\Sigma$ modulator output using the proposed digital interpolation filter had ${\pm}$ 0.001 [㏈], -0.0025[㏈] and -75[㏈], respectively. Also the inband group delay was 30.07/fs[s] and the error of group delay was 0.1672%. Also, the attenuation of stopband has been increased -20[㏈] approximately at 65[㎑], out-of-band. Therefore the RC products of analog low-pass filter on chip have been decreased compared with the conventional digital interpolation filter structure.

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Parallel Structure of Viterbi Decoder for High Performance of PRML Signal (PRML신호용 고성능 Viterbi Decoder의 병렬구조)

  • Seo, Beom-Soo;Kim, Jong-Man;Kim, Hyong-Suk
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.58 no.4
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    • pp.623-626
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    • 2009
  • In this paper, we applied new analog viterbi decoder to decode PR(1,2,2,1) signal for DVD and analyze the specific and signal characteristics. We implemented the parallel analog viterbi decoder and the convolution digital viterbi decoder(the digital PRML) utilizing the technology of analog parallel processing circuits. The proposed analog viterbi decoder can replace the conventional digital viterbi decoder by a new one. Our circuits design the low distortion and the high accuracy over the previous implementation. Through the parallel structure of the proposed viterbi decoder, we got the achievement of the decoding speed by the multiple times.

A High-Efficiency Driver Design for Mobile Digital Audio Speakers (모바일용 디지털 오디오 스피커를 위한 고효율 드라이버 설계)

  • Kim, Yong-Serk;Rim, Min-Joon
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.60 no.1
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    • pp.19-26
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    • 2011
  • In this paper, we designed Interpolation FIR(Finite Impulse Response) filter and 1-bit SDM(Sigma- Delta Modulator) for small digital audio speaker, which has low power consumption and high output characteristics. In order to achieve high linearity and low distortion performance of the systems, we adopt Type I Chevychev FIR filter which has equiripple characteristics in the pass band and proposed high efficient FIR filter structure. SDM is the most efficient modulation technique among the noise shaping techniques. In this paper, we implemented SDM using CIFB(Cascade of Intergrators, Feed-Back) which is generally used in DAC of small digital audio speakers. The proposed SDM structure can achieve high SNR, high-efficiency characteristics and low power consumption in mobile devices. Also considering manufacture of SoC(System on Chip), we performed simulation with Matlab and Verilog HDL to obtain optimal number of operational bits and verified a good experimental results.

Design and Implementation of a Digital Evidence Management Model Based on Hyperledger Fabric

  • Jeong, Junho;Kim, Donghyo;Lee, Byungdo;Son, Yunsik
    • Journal of Information Processing Systems
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    • v.16 no.4
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    • pp.760-773
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    • 2020
  • When a crime occurs, the information necessary for solving the case, and various pieces of the evidence needed to prove the crime are collected from the crime scene. The tangible residues collected through scientific methods at the crime scene become evidence at trial and a clue to prove the facts directly against the offense of the suspect. Therefore, the scientific investigation and forensic handling for securing objective forensic in crime investigation is increasingly important. Today, digital systems, such as smartphones, CCTVs, black boxes, etc. are increasingly used as criminal information investigation clues, and digital forensic is becoming a decisive factor in investigation and trial. However, the systems have the risk that digital forensic may be damaged or manipulated by malicious insiders in the existing centralized management systems based on client/server structure. In this paper, we design and implement a blockchain based digital forensic management model using Hyperledger Fabric and Docker to guarantee the reliability and integrity of digital forensic. The proposed digital evidence management model allows only authorized participants in a distributed environment without a central management agency access the network to share and manage potential crime data. Therefore, it could be relatively safe from malicious internal attackers compared to the existing client/server model.

A study on the combination of transmedia and gamification and the structure of game design (트랜스미디어와 게이미피케이션의 결합과 게임 디자인의 구조에 대한 고찰)

  • CHO, Il-hyun
    • Journal of Digital Convergence
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    • v.18 no.4
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    • pp.433-438
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    • 2020
  • With the rapid development of media environment and contents production technology, the era of multi-platform convergence transmedia has emerged, and communication method through trans media contents has attracted attention. Transmedia content refers to the concept of translating individual content into multi-platforms, which creates an expanded worldview of convergence. In addition, the interaction generated in this process is very important and difficult to control in the progress of the content. In this paper, we focused on the combination of transmedia content and gamification concept as a solution, and based on the 'MDA framework' which is a theoretical system of analysis and approach for implementing game design, We looked at the structure. It is expected that a review of the fundamental game design structure, which establishes a prediction system of value and fun experiences through the balance of technology and emotions, will be helpful as a basis for designing trans media contents.

Study on the Method of Building Library for Integrated Design in Construction (건설 통합 설계를 위한 라이브러리 구축 방법에 관한 연구)

  • Song, Choon-Dong;Jeon, Yoong-Il;Kim, Hual-Soo
    • Journal of The Korean Digital Architecture Interior Association
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    • v.2 no.1
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    • pp.16-23
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    • 2002
  • The Subject of this research is building integrated library to supported to CAAD of the A.E.C field that is oriented to the environment of integrated design. In this research, we design and implement a new library model as a solution of design-data sharing and multi-displaying that is on the rise among many problems in construction integration. We name this integrated library ACO(Actual Component Object) and using the ACO, we can share data without loss in the fields such as construction, estimation, structure. Together with this, the different expressions along each field provide the solution of sharing both graphic data and non-graphic data. This ACO is a newly conceptualized Library that is able to supply a composite structure to an architect(designer) through the internet-based ACO System. To the ACO System that supplies those ACO service, we introduce the concept of DBMS in design and design administrator, and we investigate the solutions that enable an architect to use this ACO directly on the Web.

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Factor Analysis and Content Development of Digital Text Structure for Designing Visual Experience in e-Book Interface (e-Book 인터페이스에서 시각적 경험 설계를 위한 디지털 텍스트 구조의 물리적 요인분석 및 콘텐츠 개발)

  • Sung, Eun-Mo
    • The Journal of the Korea Contents Association
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    • v.11 no.11
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    • pp.79-90
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    • 2011
  • The purpose of this study is to explore physical factor of digital text structure for designing e-Book interface and to develop prototype of e-Book interface by applied these factors. To address this goal, explore factor analysis and confirmatory factor analysis were employed, 237 university students were the participated in this study. According to a result, 29 items for physical feature of digital text structure were developed, 9 factors of digital text structure were also extracted; volume, depth, density, space, layout, format, signal, size, and length. Besides, to identify structure of pre-defined 9 factors, confirmatory factor analysis was conducted. As a result of CFA, the factor structure was supported by all of model fit indices.

The Cognitive Ecological Characteristics in Folded Space and Their Effects (폴드공간의 인지생태론적 특성과 그 효과)

  • Kim Joomi
    • Korean Institute of Interior Design Journal
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    • v.14 no.3 s.50
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    • pp.181-190
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    • 2005
  • In accordance with the rapid growth of digital media in 1990s, the state of indetermination that is found in digital process has been emphasized in the field of natural science and philosophy. Digitalized space design has been dramatically developed and it raised heated debate and comment on 'folded space' The purpose of this thesis is to explore how the cognitive-ecological factors constitute fold structures in space design of the late 20th century. Syntax of space structure and geometric composition were analyzed to define what types of cognitive-ecological factors are contrived in the process of visual information. In particular, I put higher theoretical emphasis on what characteristics are ensued in the process of structuring spaces than any other subjects. Through theses analyses and discussions, I raised questions on what principles are operating to create new space design that counts on non-linear structure and its formational process. And I also observed what influences these structural principles of design could fundamentally bring to human beings. First, I proposed that we could overcome reductionist space design through cognitive-ecological approach. Some key concepts such as affordance, parallel processing, and redundancy were adopted as defining elements of non-linear structures. As a result of analyses, I found that the cognitive-ecological approach could substitute the reductionist space design of the past. What is also found is that the three variables are the ultimate ecological elements. In addition, as a methodological concept of fold structures, the form of 'topology' was highlighted because it could be a supporting idea to the cognitive-ecological factors. Second, I claimed that non-linear design is more experiential than rational linear design, and it is more efficiently correspondent to human being than any other forms. What is intended and implied in non-linear structure is also indicated.