subject: Digital Tv, High Definition Digital Television Based On A Large Collection Of Knowledge [print this page] The United States first proposed, and after eight years of technology development, the Federal Commission (FCC) has finally formalized in 1995, HDTV terrestrial
Broadcasting And product specifications. In 1998, the United States has formally launched digital high-definition programming to the 2006 analog TV will be completely eliminated, replaced by a digital high definition television. Europe, Australia also has in 03 years, in 2004 begin broadcasting digital television programs.
Existing digital TV and analog TV the biggest difference is that digital TV picture clear and stable image quality in the coverage area will not be the signal transmission distance and changes in the signal transmission throughout the process both outside noise will not affect the television image. The analog TV signal transmission distance will be farther along with the image quality worse. In recent years, technology companies began to develop stronger video processing circuit in digital signal processing technology to improve the performance of analog circuits
Example: the analog TV line frequency, field frequency increased, and the times to achieve progressive scan field (100HZ) scan, to eliminate flicker and improve picture quality. However, this digital television with the previously mentioned principle at work is completely different, the effect is much worse than digital television. For example: high-definition television display format 1920 1080i image pixel density of up to 135 movie film's picture quality. Digital TV also has a variety of different levels of image resolution display format. China's high-definition display format for the 1920 1080i/50HZ interlaced scanning, while the U.S. high-definition television display format 1920 1080i/60Hz interlaced, 1280 720P/60Hz progressive scan,
Standard Definition display format 720 480P/60Hz progressive scan, these are not analog television
Digital TV is shooting, editing, Make , Broadcast, transmit, receive and receiving broadcast television signals such as the whole process of use of digital technology. Digital high definition television is digital television (DTV) standard in the most advanced one, referred to as HDTV (HighDefinision TV).
Digital TV with high-quality Sound System, analog TV reception, high, low regulation, left channel balance, surround sound, such as loudness control switch functions. NICAM broadcast in a region, by remote control, set to automatically NICAM mode, the cursor can automatically identify whether the broadcast TV NICAM.
Digital TV (DigitalTV) including digital HDTV, digital SDTV and digital LDTV of three. Is the difference between the three main image quality and transmission channel bandwidth occupied different.
View from the visual effects, digital HDTV (1000 lines or more) for high-definition television (HighDefinitionTelevision) short, image quality can be at or near the level of 35mm wide-screen film; SDTV (500-600 lines), or standard-definition TV mainly corresponds to the resolution of existing television magnitude, its image quality
Studio Level; LDTV (200-300 line) or normal-definition television, mainly corresponds to the resolution of the current magnitude of VCD. Because digital television is the future trend, we now provide HDTV and SDTV, LDTV If no special instructions are to all-digital system.
States was October 1, 1999 50th Daqing parade conducted high-definition digital TV pilot. Development of HDTV for China's situation has become
TV Industry priority. Short, digital television means from the studio to
Launch
, Transmission, all links are used to receive digital TV signals or all of the signal propagation of the system is through a series of 0,1 numbers posed by digital stream for transmission, digital signal transmission rate of 19.39 megabytes per second section, such a large data stream transmission ensures high-definition digital TV, analog TV to overcome the deficiencies. As can also allow several standard digital TV signals simultaneously, under every digital channel can be divided into several sub-channels.
Digital Tv, High Definition Digital Television Based On A Large Collection Of Knowledge
