Universal tuner: a video streaming system for CPU/power-constrained mobile devices

Richard Han, Ching-Yung Lin, John R. Smith, Belle Tseng, Vida Ha

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review


Due to the limited processing capability, memory constraints, and the power budget of mobile clients, multimedia coders and/or decoders are often difficult to implement on wireless handheld PDAs. In this Universal Tuner project, we designed and implemented a wireless video streaming system that transcodes MPEG-1/2 videos or live TV broadcasting videos to the BW or indexed color Palm OS devices. In our system, the complexity of multimedia compression and decompression algorithms is adaptively partitioned between the encoder and decoder. A mobile client would selectively disable or reenable stages of the algorithm to adapt to the device's effective processing capability. Our variable-complexity strategy of selective disabling of modules supports graceful degradation of the complexity of multimedia coding and decoding into a mobile client's low-power mode, i.e. the clock frequency of its next-generation low power CPU has been scaled down to conserve power. We modified the structure of the standard motion-compensated DCT video codecs to implement a simplified the encoder on a PC server and the decoder on a complexity-constrained PDA viewing client.
Original languageEnglish
Title of host publicationMULTIMEDIA '01: Proceedings of the ninth ACM international conference on Multimedia
Place of PublicationNew York, NY
PublisherAssociation for Computing Machinery, Inc
Number of pages2
ISBN (Print)9781581133943
Publication statusPublished - 2001
Externally publishedYes
EventACM International Conference on Multimedia (9th : 2001) - Ottawa, Canada
Duration: 30 Sept 20015 Oct 2001


ConferenceACM International Conference on Multimedia (9th : 2001)
Abbreviated titleMM01


  • Compression
  • decompression
  • algorithms
  • partitioning
  • complexity
  • mobile
  • wireless
  • PDA
  • cell phone
  • graceful degradation
  • codec
  • multimedia
  • video
  • image
  • audio


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