ITU-R REPORT BT.1220 [ Active ]

Introduction

Television pictures wider than the conventional 4:3 aspect ratio have been available for many years through the medium of cinematographic film. However, the development of high definition television with an aspect ratio of 16:9 has increased the availability of wide aspect ratio source material and has led to the development of wide aspect ratio television displays. There is therefore considerable current interest in ways of using wide aspect ratio formats for 4:3 enhanced and conventional television systems, in addition to those of high definition described in Report 801. It is noted that many of the enhancements described in the context of 4:3 aspect ratio systems in Report 1077 can also be applied to the wider aspect ratio systems described here.

The problems of protection ratio and radio-frequency receiver characteristics will be studied in IWP 11/5 (see Decision 42).

The new wide screen formats may be used in several ways. For example, the total screen may be used to combine one main 4:3 picture and several smaller sub-pictures. These sub-pictures might provide a variety of other services, such as teletext, transmitted pages of text, transmitted stills, etc.

Decision 91 and Report 1224 describe the work to be done and the main results already reached on the matter of harmonization with other international standardizing bodies for industrial/consumer usage applications.