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MPH or Mobile-Pedestrian-Handheld is the trademark of a modification of the 8VSB modulation system used for transmission of digital television using the ATSC system. The modification addresses a constraint of conventional ATSC transmission, in that reliable reception is difficult or impossible when the receiver is moving. The technology was jointly developed by LG and Harris. The name is a wordplay on MPH, the ubiquitous (in the U.S.) acronym for miles per hour.
The MPH system is a multiple-stream approach, with the main service stream for existing DTV and HDTV services, and the MPH stream for one or more mobile, pedestrian, and/or handheld services. Key attributes of the MPH system include:
- Backward compatibility with the existing ATSC 8VSB transmission and receiving equipment
- Capability to receive broadcast signals at high (mobile) speed with a single antenna
- Use of small handheld receivers without the need for multiple antennas
- Power savings in handheld receivers
- Flexibility in both data rates and robustness
- Use of advanced video and audio coding
References
- Harris Press Release, Harris Corporation, LG Electronics Announce In-Band Mobile DTV System..., http://www.harris.com/view_pressrelease.asp?act=lookup&pr_id=2105, retrieved on 5 April 2007, April 3, 2007.