Audio Considerations for Mobile DTV

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Mobile television is quickly emerging as a new medium for experiencing video programming. Devices are generally quite small and include handheld televisions, mobile phones, tablets, laptops and related devices. The dynamic range “comfort zone” used for mixing television audio for viewing on stereo or surround in-the-home televisions is far too wide for comfortable listening on typical “earbuds” or worse, the tiny speakers in the mobile device.

Dialogue intelligibility is a serious issue for these less-than-ideal transducers. Physical and electrical limitations impact audio quality and can reduce intelligibility. Further, the environments where mobile television would typically be used have a relatively high background noise loudness floor – if the volume is simply increased for acceptable intelligibility on soft passages, loud passages run the risk of outstripping device capabilities or worse, potentially causing uncomfortably loud audio.

The goal is to deliver to the viewer the most satisfying experience appropriate for widely varying individual listening environments. Research has shown that attempts to improve mobile audio by simply employing traditional broadcast audio processing systems actually make things worse.



  Date and Time

  Location

  Contact

  Registration



  • 600 Mountain Avenue
  • Murray Hill, New Jersey
  • United States
  • Building: Bell Labs
  • Room Number: 6A-106

Staticmap?size=250x200&sensor=false&zoom=14&markers=40.6842504%2c 74
  • Joe Stack, BT Chair (609) 647-9677 Adriaan J. van Wijngaarden, IT Chair, avw@ieee.org
  • Co-sponsored by BT Chapter, IT, COMSOC, VTS Chapters
  • Starts 21 February 2014 08:00 AM
  • Ends 06 May 2014 04:00 PM
  • All times are America/New_York
  • No Admission Charge
  • Register


  Speakers

Tim Carroll of The Telos Alliance / Linear Acoustic

Topic:

Audio Considerations for Mobile DTV

This presentation includes a brief review of the audio portion of the ATSC specification for digital television, a discussion of the physical and electrical constraints inherent in typical mobile devices and an overview of the psychoacoustic aspects of listening in less-than-ideal environments. It then analyzes various approaches to handling audio for mobile TV including single-ended processing both pre- and post-transmission, metadata, and hybrid combinations of these techniques. Results of some real-world installations will also be described and recommendations for broadcasters and device manufacturers will be offered.

Biography: Tim Carroll is founder and president of Linear Acoustic Inc., the company behind the award winning AEROMAX® range of real-time and file-based audio loudness control solutions, and industry standard UPMAX® stereo/5.1 channel upmixing and downmixing technologies. The company provided its products technical services for NBC’s coverage of the 2008 Beijing Summer Games, the 2010 Vancouver Winter Games, and the 2012 London Summer Games. Linear Acoustic is a recipient of a Technology and Engineering Emmy Award for work on metadata and loudness. Tim is a member of IEEE, AES, SBE, SMPTE, and BKSTS and is a participant in the work of the ATSC and the EBU.

Tim Carroll of The Telos Alliance / Linear Acoustic

Topic:

Audio Considerations for Mobile DTV

Biography:

Tim Carroll of The Telos Alliance / Linear Acoustic

Topic:

Audio Considerations for Mobile DTV

Biography:

Tim Carroll of The Telos Alliance / Linear Acoustic

Topic:

Audio Considerations for Mobile DTV

Biography:





Agenda

This presentation includes a brief review of the audio portion of the ATSC specification for digital television, a discussion of the physical and electrical constraints inherent in typical mobile devices and an overview of the psycho-acoustic aspects of listening in less-than-ideal environments. It then analyzes various approaches to handling audio for mobile TV including single-ended processing both pre- and post-transmission, metadata, and hybrid combinations of these techniques. Results of some real-world installations will also be described and recommendations for broadcasters and device manufacturers will be offered.