A Multimedia Service Implementation Using MJPEG and QCELP in Wireless Handset

  • Gu-Min Jeong
  • Seung-Won Na
  • Doo-Hee Jung
  • Jun-Ho Kang
  • Gu-Pil Jeong
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3597)

Abstract

In this paper, a fast implementation of JPEG is discussed and its application to multimedia service is presented for mobile wireless internet. A fast JPEG player is developed based on several fast algorithms for wireless handset. In the color transformation, RCT is adopted instead of ICT for JPEG source. For the most time-consuming DCT part, the binDCT can reduce the decoding time. In upsampling and RGB conversion, the transformation from YCbCr to RGB 16 bit is made at one time. In some parts, assembly language is applied for high-speed. Also, an implementation of multimedia in wireless handset is described using MJPEG (Motion JPEG) and QCELP(Qualcomm Code Excited Linear Prediction Coding). MJPEG and QCELP are used for video and sound, which are synchronized in handset. For the play of MJPEG, the decoder is implemented as a SW upon the MSM 5500 baseband chip using the fast JPEG decoder. For the play of QCELP, the embedded QCELP player in handset is used. The implemented multimedia player has a fast speed preserving the image quality.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • Gu-Min Jeong
    • 1
  • Seung-Won Na
    • 2
  • Doo-Hee Jung
    • 3
  • Jun-Ho Kang
    • 4
  • Gu-Pil Jeong
    • 5
  1. 1.Dept. of Electrical EngineeringKookmin UniversityKorea
  2. 2.Terminal Development Team, SK TelecomKorea
  3. 3.Dept. of Electronic EngineeringKorea Polytechnic UniversityKorea
  4. 4.NeoMtel CooperationKorea
  5. 5.School of Electrical Engineering and Computer EngineeringChungbuk National UniversityKorea

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