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One-chip Microprocessor를 利用한 Taximeter 設計
鄭昌京 명지대학교 1983 明大論文集 Vol.14 No.-
One-chip microprocessor를 使用하여 Taximeter를 設計, 實用化하였다. 現在 使用되고 있는 機械式 Taximeter나 혹은 CMOS 論理소자를 利用한 電子式 Taximeter에 比해 매우 간단하고 技能을 추가할수 있었다. 또한 요금의 變更 및 故障의 수리가 容易한 回路를 設計하였다. Taximeter was designed and implemented using One-chip microporcessor, MC141200. Compare with mechanical type taximeter and electronic type taximeter using discrete CMOS logic, circuit is simple and more features are added with less components. And also it is cenvenient to change fare and easy for maintenance.
정창경 明知大學校 産業技術硏究所 1985 産業技術硏究所論文集 Vol.4 No.-
Taximeter and tachometer were designed with two CMOS one-chip 8bit microcomputer, MC146805G2 and MC146805E2. Compare with other type taximeters more functions and tachometer features were added with less devices. With a few interfaces printer also can be interfaced. Power consumption could be decreased and changing fare system and maintenance easily.
정창경 명지대학교 1986 明大論文集 Vol.17 No.-
45㎒∼70㎒의 주파수 대역을 갖는 FM통신용 frequency synthesizer로 분주기/위상검출기/기준주파수 분주기를 포함하는 집적회로(synthesizer)를 이용하여 설계하였다. single loop로 구성하므로써 pretuning을 사용치 않고 acquisition time을 2ms까지 줄일 수 있었다. 일반적인 discrete 및 counter회로를 사용한 회로에 비하여 소자 및 power를 줄일 수 있었으며 system의 noise를 개선할 수 있었다. Frequency synthesizer system for FM communication carrier(Bandwidth of 45㎒∼70㎒) was designed using a Integrated Circuits with divider/phase-detector and reference counter circuit using single loop concept, it was possible to decrease component, power consumption and to improve noise characteristics. Acquisition time without pretuning could be reduced to 2ms.
마이크로 컴퓨터의 병렬형 CRT 입출력 방식과 Prototype Program development System에 관한 연구
정창경 대한전자공학회 1977 전자공학회지 Vol.14 No.4
본 연구에서는 microcomputer system과 CRT를 병렬로 interface하는 방식에 대하여 검토하였다. 병렬형 CRT입출력 방식은 직렬형 입출력 방식에 비해서 소자의 수를 줄일 수 있고 또한 현저하게 입출력의 속도를 개선할 수 있었다. 그리고 이 방식을 응용한 system으로서 prototype program development system을 제작하였고 programroqkf시 이 system이 유용하게 사용됨을 볼 수 있었다. A parallel mode CRT interfacing technique has been suggested for a microcomputer system. The number of components and the I/O speed were improved significantly by this technique. As an appliation of this technique, a prototype program develoment system was designed and tested experimentally for the use fulness in prototype program developmenting.
정창경 明知大學校 産業技術硏究所 1990 産業技術硏究所論文集 Vol.9 No.-
Spread spectrum is a good candidate for improving capacity of mobile radio. High capacity mobile radio multiple access scheme has been suggested with slow frequency hopping multiple access method. CDMA combines with TDMA and coding technique, system capacity can be increased without BER increase. It is shown that the suggested method is capable of offering capacity improvement in cellular and cordless telephone channel. Upper and Lower bound error rates are calculated approximately.
저 지연시간 CELP 음성 부호화기 성능 개선에 관한 연구
鄭昌京,張泰成,李乃仁 明知大學校 産業技術硏究所 1994 産業技術硏究所論文集 Vol.13 No.-
This paper presents a good-quality 8 kb/s speech coder which has one-way coding delay less than 5 ms. The coder achieves one-way coding delay of less than 5 ms by masking both the LPC predictor and the excitation gain backward-adaptive, and by using a small excitation vector size of eleven samples. We propose a low delay excitation reconstruction algorithm based on a vector quantized multi-tap adaptive codebook or a single gain fixed codebook in producing a good quality speech signal operating at 8 kb/s.
鄭昌京,任祥均 明知大學校 産業技術硏究所 1994 産業技術硏究所論文集 Vol.13 No.-
In this paper, we researched about CELP(Code-Excited Linear Prediction) Speech coding algorithm using efficient pseudo-stovhastic block codes, adaptive-codebook and improred fixed-gaim-codebook. The pseudo-stochastic block codes refer to stochastically populated block codes. The adaptive-codebook made with previous prediction speech data by storage-shift register. This CELP coding algorithm enables the coding of toll quality speech at bit rates from 4.8 kbits/s to 9.6 kbits/s. This algorithm was realized with TMS320C30 microprocessor in realtime.