• 대한전자공학회논문지SP
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• 제46권5호
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• pp.151-161
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• 2009

Audio Video Standard (AVS)는 중국내의 멀티미디어 응용기기를 위해 개발된 오디오/비디오 압축 표준이다. AVS는 표준화 코덱 중 성능이 가장 우수한 것으로 알려진 H.264/AVC에 비해 낮은 복잡도의 비디오 알고리즘을 사용하면서도 비슷한 RD 성능을 보인다. AVS 비디오 코덱은 VGA급 이상의 영상을 타겟으로 하기 때문에 큰 해상도에서 압축효율이 좋은 $8{\times}8$ 단위 블록의 예측 및 변환 알고리즘을 사용한다. 현재 중국에서 IPTV 및 모바일 애플리케이션을 위한 코덱으로 AVS를 사용하는 비중이 높아지고 있어 국내의 기업 및 연구소에서도 AVS를 위한 애플리케이션 및 칩 개발을 위한 연구가 진행되고 있다. 본 연구에서는 AVS 비디오 복호화기 알고리즘을 분석하고 이를 바탕으로 하여 불필요한 메모리 연산이 없도록 AVS 비디오 복호화기를 구현하고 이를 TI의 Davinci EVM보드에서 최적화하였다. 또한, 제안한 복호화기에 고속의 VLD 알고리즘을 적용하고 linear assembly로 디블록킹 필터를 구현하는 등 DSP에 적합하도록 최적화를 진행하였다. 이를 통해 AVS의 참조 소프트웨어인 RM 5.2J 복호화기와 비교하여 $500%{\sim}700%$의 복호 속도 향상을 이루었다.

• 한국음향학회지
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• 제20권1호
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• pp.56-61
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• 2001

본 논문은 비동기 방식의 IMT-2000 단말기용 ASIC (주문형 집적회로)에 포함되는 음성부호화기 알고리즘인 AMR(Adaptive Multi Rate) 보코더의 실시간 구현에 관한 것이다. 구현된 AMR 보코더는 12.2kbps에서 4.75kbps까지 8가지의 다중 비트율을 가지고 있으며, 인코더와 디코더 기능 외에 VAD (Voice Activity Detection) 블록과 SCR (Source Controlled Rate operation) 블록 등의 부가기능 및 시스템과의 접속 처리를 위한 프레임 구성 기능도 구현되어 있다. AMR 보코더를 구현하기 위하여 설계된 DSP (디지털 신호처리기)는 TeakLite 코어를 기반으로 하여 메모리 블록, 직렬접속 블록, CPU와의 접속을 위한 레지스터 파일 블록, 인터럽트 제어회로 등으로 구성된 16비트 고정 소수점형 DSP이다. 실시간 구현 방법에서는 메모리의 효율적인 관리를 통하여 계산량을 최적화하여 최대 동작 계산량을 약 24MIPS로 줄였으며, 구현된 AMR 보코더는 3GPP의 표준 시험 벡터를 모두 통과하여 검증을 완료하고, 실시간 보드 시험에서도 안정적으로 동작하는 것이 확인되었다.

• 제어로봇시스템학회논문지
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• 제5권6호
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• pp.691-697
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• 1999

This paper describes the implementation of a high speed image processing board. This image processing board is consist of a image acquisition part and a image processing part. The image acquistion part is digitizing the image input data from CIS and save it to the dual port RAM. By putting on the dual port memory between two parts, during acquistion of image, the image processing part can be effectively processing of large-volume image data. Most of all image preprocessing part are integrated in a large-scaled FPGA. We arwe using ADSP-2181 of the Analog Device Inc., LTD. for a image processing part, and using the available all memory of DSP for the large-volume image data. Especially, using of IDMA exchanges the data with the external microprocessor or the external PC, and can watch the result of image processing and acquired image. Finally, we show that an implemented image processing board used for the simulation of image retreval by the one of the typical application.

• 한국정밀공학회지
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• 제26권7호
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• pp.51-57
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• 2009

In this paper, we studied on an attenuation effect of automobile exhaust noise according to the direction of canceling speaker in duct-acoustic ANC system. Automobile exhaust noise was recorded at 800rpm, 3500rpm and 5000rpm of a diesel engine. Directions of canceling speaker can be set to $30^{\circ}$, $90^{\circ}$ and $150^{\circ}$ against the primary noise flow by acrylic ducts to be made for the experimentation. DSP board used to control the ANC system. The algorithm of this ANC system applied the Filtered-x-LMS algorithm that is modified to compensate for a property of DSP input signal and the secondary-path effect. As an experiment result, the direction of canceling speaker was proved to influence the reduction effect of noise. The $150^{\circ}$ duct in the attenuation effect of noise showed a better result than the $90^{\circ}$ or $30^{\circ}$ duct.

• 한국소음진동공학회논문집
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• 제19권3호
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• pp.251-260
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• 2009

In this paper, we studied on an attenuation effect of automobile exhaust noise according to the direction of canceling speaker in ANC system. Automobile exhaust noise was recorded at 800 rpm, 3500 rpm and 5000 rpm of a diesel engine. Directions of canceling speaker can be set to $30^{\circ}$, $90^{\circ}$ and $150^{\circ}$ against the primary noise flow by acrylic ducts to be made for the experimentation. DSP board with TMS320C6416 chip of Texas Instrument Co. used to control the ANC system. The algorithm of this ANC system applied the Filtered-x-LMS algorithm that is modified to compensate for a property of DSP input signal and the secondary-path effect. As an experiment result, the direction of canceling speaker was proved to influence the reduction effect of noise. The $150^{\circ}$ duct in the attenuation effect of noise showed a better result than the $90^{\circ}$ or $30^{\circ}$ duct.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1990년도 하계학술대회 논문집
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• pp.106-112
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• 1990

본 논문은 디지탈 거리 계전 방식의 구현을 위해 최적 FIR 필터를 사용하는 알고리즘을 제시한다. 이 알고리즘은 고장 발생시 과도 현상에 의한 임피이던스 궤적의 영향 면에서 볼 때, 기존의 디지탈 거리계전 알고리즘이나 Kalman 필터를 이용한 거리계전 알고리즘 보다 훨씬 유리하여 고장 발생 시 빠르고 정확한 고장 판단과 고장점의 산출을 제공한다. 이러한 알고리즘은 EMTP를 통해 생성된 고장 데이타의 실시간 적용을 통해 입증되었고, 이의 실시간 구현은 모토롤라 DSP (Digital Signal Processor) 56001을 연산 전용의 프로세서로 사용한 디지탈 보호계전 시스템을 통하여 성공적으로 수행되었다.

• 디지털산업정보학회논문지
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• 제15권4호
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• pp.31-40
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• 2019

This paper proposes an adaptive PCIe system for TI C66x DSPs. Conventionally, the PCIe system provided by the C66x is a system dependent on the structure in which the primary core writes an application to the DSP memory through the PCIe interface, then activate the secondary core. Due to the dependency between the cores, when developing a project using a PCIe interface, the remaining cores have to be programmed with a concern of the primary core used as the PCIe interface. Therefore, in order to de-couple the connections among the cores, an adaptive PCIe system is proposed, in the paper, in which the cores operate independently compared to the conventional system. Since the core used as the PCIe interface only runs PCIe related operations in the new system, the remaining cores can be fully utilized without concerning the connections with the core for PCIe interface. In order to verify the feasibility of the proposed adaptive PCIe system, the implementations of LTE-A down link, and IEEE 802.11ac are carried out using the evaluation board which includes a TMS320C6670 chip. Altogether, these results support that we demonstrated that the digital signal processing systems with the PCIe Interface can be developed more rapidly by applying the proposed system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 D
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• pp.2784-2786
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• 2000

Mobile robots include control modules for autonomous obstacle avoidance and navigation. They are range modules to detect and avoid obstacles. motor control modules to operate two wheels. and encoder modules for localization. There is needed an appropriate controller for each modules. In this paper. a control system. including 18 channels for Sonar sensors. 4 channels for PWM modules. and 4 channels for encoder modules. is proposed using TMS320C32 DSP adopted with CAN. The board communicates with other modules by CAN. so that mobile robots can perform several tasks in real time. So we can realize on autonomous mobile robot with basic functions such as obstacle avoidance by using the developed controller. Especially. this controller has 100 msec scan time for 16 sonar sensors and can detect closer objects comparing with standard sonar sensors.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 추계학술대회 논문집 학회본부
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• pp.462-463
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• 1996

This study describes the dissipation factor measuring techniques of insulating oil on the operating, transformer by using digital signal processing. After applying voltage to the sensor which is installed in a transformer, acquiring source voltage and current of sensor and using cross-correlation techniques, we can check the dissipation factor of insulating oil. To improve measuring accuracy and the speed of process, we use hardware such as TMS320C31 DSP board and analog filter and software such as fast cross-correlation techniques, rectangular window, and digital filtering techniques. We simulated the measuring accuracy and the degree of the noise effect of this new measuring techniques by computer simulation, and compared the simplified measuring devices with Schering Bridge on degraded insulating oil. The result showed that this measuring technique can be used as diagnostic method on the pole transformers.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 추계학술대회 논문집 학회본부
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• pp.270-272
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• 1996

This paper describes the dissipation factor measuring techniques of insulating oil on operating pole transformer by using digital signal processor. After applying voltage to the electrodes which is installed in a transformer, acquiring source voltage and current of electrodes and using cross-correlation techniques, we can check the dissipation factor of insulating oil. To improve measuring accuracy and the speed of process, we use hardware such as TMS320C31 DSP board and software such as cross-correlation techniques and rectangular window techniques. We simulated the measuring accuracy and the degree of the noise effect of this new measuring techniques by using computer simulation, and compared the simplified measuring devices with schering bridge on degraded insulating oil. The result showed that this measuring technique can be used as diagnostic method on the pole transformers.