LG Electronics Inc. and Harris Corporation, common developers of the MPHä system (Mobile-Pedestrian Handheld) In-Band Mobile Digital Television, submitted this system to the ATSC (Advanced Television Systems) Committee), to be considered as a standard that would allow broadcasters to offer television signals digital, DTV, high-quality to a wide range of mobile devices and laptops. The ATSC is an international organization, without encouragement for profit, which voluntarily develops standards for digital television systems.
The ATSC Group of Technology and Standards requested technological proposals from part of the companies that offer systems aimed at facilitating the delivery of digital television programming and data to mobile and portable devices, through signals digital broadcast. LG and Harris submitted a proposal detailing its technology for mobile and portable DTV delivery, which is compatible with the ATSC standard.
Broadcast companies and electronic equipment considers that DTV for mobile devices and laptops could be an important source of opportunities and profits for device manufacturers and broadcast, and would generate new services for users End.
These new services, which would operate with ATSC-compliant broadcast transmissions, they would boost the consumer adoption of wearable devices who want value-added services, which are not currently available available through the usual television models open. With MPH, consumers can watch your shows favorites from local channels, watch movies and sports, review news and weather information, and access paid services, when they are traveling in vehicles at high speed or using portable video devices away from house.
Developed by Harris Corporation and LG Electronics, and their research subsidiary in the United States, Zenith, the MPH In-Band Mobile DTV system provides robust DTV signals to mobile and portable devices.
Harris and LG designed MPH for be fully compliant with the ATSC A/110 standard for distributed transmission. As such, the system offers a system highly compatible and easy to market, which has already been tested and proven.
So far, reliable reception of free-to-air television signals has been impossible in vehicles on the move or portable devices such as mobile phones or laptops. Unlike telephone networks Cellular, MPH technology uses a single transmitter by commercial and public broadcasters. For broadcasters, this new technology opens the doors to a new and potentially lucrative market.
MPH is a multi-flow system, whose the main destination is the existing DTV and HDTV services, and the MPH flow for one or more mobile or portable services. Some key attributes of the MPH system include:
- Compatibility with the existing transmission and reception equipment in 8-VSB of ATSC.
- Signal reception capacity high-speed broadcast with a single antenna.
- Use of practical devices and small without the need for multiple antennas.
- Saving capabilities of power in portable receivers.
- Flexibility both in data transfer as in robustness.
- Transfer efficiency data; and
- Using advanced coding video and audio in the MPH stream.
Another advantage of the MPH system is that does not require third-party service providers or agreements on the spectrum.
In your response to the request for proposals from ATSC, Harris and LG Electronics offered a technical overview of the MPH system, which improves the ability to areas such as Doppler and multipath: "Improvement is achieved by a combination of a perfected FEC (forward error correction) and aggregate instruction signals.
MPH system uses multiplexing temporary of common "main" transport packages or "normal" with improved packages, such that the only one modification to the main packages is their distribution. In addition, improved packages and instruction signals additional are encoded such that they are compatible with the FEC usual, ensuring 100% compatibility with receivers Existing. Traditional receivers ignore MPH packets as null packets and their contents are ignored.
Other parts of the response to ATSC: "The processing of the special physical layer of data MPH has been designed to occur in the exciter of transmission, without special processing in the multiplexer service. The needs of the service multiplexer will only be configured to provide all the main and improved data as part of a normal flow of ATSC packets, with sufficient null packages to allow the addition of FEC symbols in the Exciter. The existing studio-transmitter link is all what is required," the companies explain to ATSC.
"MPH is highly flexible in its use of data capacity, and can be statically controlled or dynamically to take from less than 200 kbps (for example, for simple audio or data service), up to multiple Mbps (when a single SD program is required on the channel main). The MPH flow by itself can consist of a single or multiple services, and the use of MPH does not obligate the use of the main stream for a single HD program or for multiple HD and SD. There is no limit to the number of MPH services allowed; there is only one limitation of the total data index. MPH has also been designed for full compatibility with the ATSC A/110 standard for distributed transmission", according to the proposal.
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