Monday, November 21, 2011

Legend Silicon brings US legacy ATSC broadcast reception one step closer to cars and mobile devices

FREMONT, USA: Legend Silicon Corp., a leading technology company delivering semiconductor solutions for the global Digital TV (DTV) market, announced SuperTV technology critical to solving diversity and mobile reception issues inherent in the US legacy Advanced Television Systems Committee (ATSC) Digital Terrestrial Broadcast (Free-to-Air) market.

No diversity or mobile reception solutions currently exist in this space, thereby limiting the delivery of free (advertiser-supported) television broadcast in 1080i resolution beyond fixed, stationary DTV with roof-top antennas. SuperTV accelerates and makes possible a higher level of mobility ultimately paving the way for car TV and mobile TV reception of legacy over-the-air (OTA) ATSC television broadcasts throughout the United States.

"We believe SuperTV will usher in a new era for OTA TV broadcasting industry in the US where mostly indoor-viewing of legacy ATSC TV will be expanded to car TVs, tablet PCs and other mobile devices," said Raj Karamchedu, Legend Silicon COO and VP of Product Marketing. "Moreover, expanding TV viewership in this way will have a positive impact on advertising revenue as mobile audiences with personal TV devices will have on-the-go access to the local television signal in full HD. Another game changer will be SuperTV reception technology co-existing with the reception of the emerging ATSC Mobile standard whose target markets are smart phones with screen sizes smaller than tablet PCs."

By way of background, US legacy ATSC broadcasts use single-carrier technology with an 8-VSB modulation scheme. Unlike the multi-carrier DTV standards of other countries, such as China's DTMB standard (uses a combination of single-carrier and multi-carrier technologies), or Europe's DVB-T and Japan's ISDB-T standards in which mobile TV reception isn't an issue, no commercially feasible solution is available in the US for the mobile reception of legacy ATSC television signals.

This stems from the fact that smooth DTV reception in a mobile environment, e.g. car TV, not only requires more than one antenna at the receiver, but often three or four antennas as is commonly seen with car TVs in Japan. Additionally, a receiver must combine separate signals at the antennas effectively for maximum performance, i.e. no reception blind spots, incorporating a special technique known as maximal-ratio combining (MRC).

At the core of SuperTV technology is Legend Silicon Corp.'s patent-pending MRC diversity technology for single-carrier terrestrial television broadcasts. First developed to solve the issues that surround the high-performance car DTV reception of single-carrier OTA broadcasts of the China DTMB standard, SuperTV technology is already in mass production in Legend Silicon Corp.'s dual-mode terrestrial-cable DTV demodulator for national CTTB standard broadcasts in China. Legend Silicon Corp. is also a co-inventor of China's GB20600-2006, the national standard for DTV broadcast (also known as CTTB or the DTMB standard).

Legend Silicon Corp. is currently developing an FPGA-based demonstration system for live car TV reception of legacy ATSC broadcasts for the US market. This demonstration platform is expected to be available in Q1 2012.

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