• Title/Summary/Keyword: Hardware Accelerator

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Implementation of Uncompressed Video Transmission System for Wireless Video Mirroring Service in Portable Multimedia Devices (휴대용 멀티미디어 기기에서의 무선 영상 미러링 서비스를 위한 비압축 영상 전송 시스템의 구현)

  • Lee, Sangjae;Jeon, Youngae;Choi, Sangsung;Cho, Kyoung-Rok
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38A no.4
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    • pp.381-391
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    • 2013
  • Wireless transmission of uncompressed video guarantees higher quality with lower latency than compressed video transmission. Although current wireless technologies cannot fully cover required data rates of about a few Gb/s for full high definition resolution, some wireless technologies such as ultra-wideband (UWB) provide 1 Gb/s data rate which is adequate for uncompressed video transmission in portable devices. In this paper, we propose an uncompressed video transmission system for wireless mirroring services in portable devices. We firstly simulated the performance of uncompressed video transmission using single or multiple 1 Gb/s UWB technology. Then we implemented hardware-based uncompressed video processing block and Gb/s wireless MAC accelerator. Finally, we show the implementation result and the demonstration of uncompressed HD video transmission using multiple 1 Gb/s UWB PHYs.

Implementation of Internet Terminal using G.729.1 Wideband Speech Codec for Next Generation Network (차세대 통신망을 위한 G.729.1 광대역 음성 코덱을 활용한 인터넷 단말 구현)

  • So, Woon-Seob;Kim, Dae-Young
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.10B
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    • pp.939-945
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    • 2008
  • Tn this paper we described the process and the results of an implementation of Internet terminal using G.729.1 wideband speech codec for next generation network. For this purpose firstly we chose a high performance RISC application processor having DSP features for speech codec processing and enhanced Multimedia Accelerator(eMMA) function for video codec. In the implementation of this terminal, we used G.729.1 codec recently standardized in ITU-T which is a new scalable speech and audio codec that extends 0.729 speech coding standard. To adopt G.729.1 codec to this terminal we transformed most of the fixed point C codes which require more complexity into assembly codes so as to minimize processing time in the processor. As a result of this work we reduced the execution time of the original C codes about 80% and operated in real time on the terminal. For video we used H.263/MPEG-4 codec which is supported by the eMMA with hardware in the processor. In the SIP call processing test connected to real network we obtained under looms end-to-end delay and 3.8 MOS value measured with PESQ instrument. Besides this terminal operated well with commercial terminals.