Dual Tds

Dual Tds

China Managed to Implement Terrestrial Hdtv and

Until the Olympics open in Beijing in August, the transmissions will have been available in the rest of the host cities: Tianjin, Shanghai, Shenyang, Qingdao, Qinhuangdao, as well as in Guangzhou and Shenzhen industrial zones. China plans to deploy the infrastructure in the whole country by 2010.
HDTV broadcasts will be available also via mobile devices. Intel, in cooperation with Silicon Legend, has prepared Intel Centrino processor dedicated for reception of the Chinese television. In June there are expected laptops from leading manufacturers, which will enable the users on the go to watch transmissions of the Olympic Games in HDTV standard. These will be products of Lenovo, HP, Asus, Sony, Samsung, and Toshiba for Chinese market.

Dual-standard digital terrestrial television DMB-TH (Digital Multimedia Broadcasting - Terrestrial / Handheld) adopted in China is a major development of the previous standards, allowing to broadcast TV programs to household televisions and various mobile receivers, both in SDTV and HDTV resolution.
Among the European DVB-T, American ATSC, Japanese ISDB-T, and Chinese DMB-TH, the latter is the most advanced standard.
It is based on TDS-OFDM (Time Domain Synchronous - Orthogonal Frequency Division Multiplexing) modulation, being a development of OFDM used in DVB-T, and much more complex than ATSC (8VSB).
The new modulation technique allows to implement (similarly to regular OFDM) multi-channel transmission that is needed for broadcasting large data streams, especially in the case of HDTV. Advanced TDS-OFDM modulation additionally improves transmission parameters through time domain division.

The Oriental Pearl Tower - the third tallest tower in the world. The TV tower broadcasts programs for inhabitants of Shanghai area.

3D in HD - three-dimensional TV. Korean concern Hyundai is now introducing 46-inch television allowing to watch 3D images in HD resolution. The viewer has to use special glasses. The TV set is another 3D display on the market, but for the first time supported by distribution of adequate signal. Japanese cable TV - BS11 - provides short programs (10 minutes or so) that enable the users to feast their eyes on the third dimension. The television costs about 4800 USD.
3D in HD
The concept of generating moving three-dimensional images has been known for over a hundred years.
To create a sense of tree-dimensional depth, the brain of the viewer has to be given two images, from the left and right eye. The images can be simultaneously recorded by a special arrangement of two cameras, or generated by a computer using appropriate software.

3D displays can be divided into two main groups - those requiring use of special glasses and those "glasses-free". The pioneer of "glasses-free" solutions is Sharp - in 2002 the company developed technology utilizing a special filter placed in front of the screen, known as parallax barrier, which diversified the images viewed by the left and right eye.

The method of generating two images by computer means has been used by Philips (WOWvx). The same method for creating quasi-3d images has been applied by Samsung and Mitsubishi.
DLP televisions from Samsung come equipped with adequate software packages and glasses, which allows to convert standard video into quasi-3D images. Similar technology is available in LaserVue televisions from Mitsubishi.

About the Author

I work in marketing & PR department in Dipol. Dipol is a warehouse for TV-Sat, WLAN and CCTV systems.

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