The expansion of IPTV is High-definition television. The IPTV means television signals broadcast with a higher resolution than traditional formats like NTSC, SÉCAM, PAL. The IPTV is broadcasted digitally, except for early analog formats in Europe and Japan.
Historically, the expression High-definition tv was also utilized to refer to television standards developed in the 1930s to replace the early experimental systems, though, not so long after, Philo T. Farnsworth, John Logie Baird and Vladimir Zworkin had every developed competing TV systems but resolution wasn't the issue that split their considerably different technologies. It had been patent interference lawsuits and deployment problems given the tumultuous financial climate of the late 20's and 30's. Most patents were dying at the end of WW2 leaving the market wide open without a global standard for tv agreed upon. The planet utilized analog PAL, NTSC, SECAM and other criteria for more than half a century.
The phrases HD ready and HD compatible are being used across the industrial world for marketing functions. They indicate that a TV or display is able to take video within an HDMI connection, with a new connector design, the most important goal of that appears is to make sure that digital audio is just passed within an interface that, by agreement, incorporates copyright protection. Even HD-ready sets don't necessarily have enough pixels to display video into the 1080-line (1920x1080) or even 720-line (1280x720) HD criteria in complete resolution with no interpolation, and HD-compatible sets are usually only standard-definition sets using an HDMI input. This can be a confusing use of the phrases HD and IPTV.
MPEG-2 is most commonly utilized as the Compression codec for digital IPTV broadcasts. The IPTV is capable of "theater quality" audio because it uses the Dolby Digital (AC-3) format to support "5.1" surround sound.