io due to the different perception mechanisms in the human eye and ear. Video is judged by three parameters, namely display technology, size, and resolution: Display Technology: TFT LCD (thin film transistor liquid crystal) technology is the key display technology used in mobile phones, laptops, projectors, and flat screen TVs. Next Generation Mobile Communications Ecosystem Although it is well suited for graphics and text it has been challenged by a new display technology OLED (organic light emitting diode). OLED offers brighter colors, smaller form factor and lower power consumption which makes it more cost effective than TFT LCD. Display Size: Another element is the size of the screen which is comparatively smaller than the computer and TV. The size of phones ranges from 2-3.5 inches, with smartphones tending to be larger. DVB-H is a mobile TV standard which supports 7 inch display sizes. Display Resolution: QVGA (quarter video graphic array) is the key standard used in display resolution. QVGA is a type of resolution whose dimensions are 320x240 pixels. It supports an aspect ratio5 of 4:3 which is compatible with mobile phones, but not with TVs which require 16:9 ratio. 9.12.2.1.1 Audio and Video Quality The video quality is determined by the format and coding technology used. MPEG-4 AVC (also known as H.264 in ITU) is the primary audio and video codec of choice. The QoS acceptability is dependent on the mobile TV service being considered. The required bit rate will be high for sports like football, but will be low for news. For QVGA displays, the following video service bit rates can be used: Highest level of video quality is 300 kbps or higher applicable for all live services. Medium level of video quality is 200 to 300 kbps, applicable for most live services except for sports. Low level video quality is 100 to200 kbps, applicable for some live services. Audio quality requirement is less stringent for most services except for music. Advanced Audio Coding (AAC) is a standardized, lossy compression and encodi