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Fractional vs Integer frame rates in UHDTV standards

InSync Technologies
First published: 01-03-2014
Size191.80 KB
Create DateJuly 7, 2014
Last UpdatedMay 22, 2015

There is general agreement that UHDTV will benefit from a higher frame rate than 60 Hz, due to the enhanced motion rendition which is so critical to picture quality at higher resolutions.

Therefore 120 Hz has already been included in the UHDTV1 systems definition, as published in SMPTE ST 2036-1 and recommended by ITU in Rec. BT 2020.

Some broadcasters would like to add 119.88 Hz (120/1.001) to UHDTV standards for easier integration with today's fractional standards.

There may be a supposition that conversion back to fractional standards could be achieved via frame drop/insertion, leading to lower complexity (and therefore lower cost) conversion products.

Others would prefer not to include new fractional frame rates in the standard, i.e. only allowing 120 Hz.

This allows for easier handling of audio and metadata, and avoids the need for drop-frame time code and the daily jam.

In this audio visual white paper, we discuss the issues relating to integer and fractional frame rates, not only considering the quality of conversion from 4K UHDTV material at 120 Hz down to today's fractional HD standard (1080 59p), but also looking at issues of time code, audio and metadata handling.



Fractional vs Integer Frame Rates in UHDTV Standards

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