4K2HD Mini-Converter v1.15r1 4
www.aja.com
Chapter 1 – Introduction
Overview
AJA’s 4K2HD downconverts professional SDI 4K/UltraHD signals to HD resolution
using AJA’s high-quality scaling for cost-effective monitoring and conversion.
4K2HD’s HD-SDI and HDMI outputs are both live all the time, producing fantastic-
looking HD images for on set monitoring or direct-to-air broadcast. 4K2HD
supports high frame rate (HFR) 4K/UltraHD inputs at 50/59.94/60fps and converts
the 2K/HD output to 50/59.94/60fps for accurate viewing. 4K2HD’s configuration
options can extract a 2K/HD resolution image from the 4K/UltraHD input to
provide a one-to-one pixel image for 4K/UltraHD focus checks on 2K/HD displays.
Configuration can be set remotely via AJA Mini-Config software control over USB.
4K2HD Operating Modes
4K2HD has three working modes: 4K Down-Conversion mode, Non-4K mode,
and Center Cut mode. The first two modes are selected automatically depending
on the input video. These modes can also be manually set using the Mini-Config
application.
• 4K Down Conversion mode: If the format of the input video is detected as 4K
or UltraHD format, or the unit is configured by Mini-Config, 4K/UltraHD input
video is down-scaled to 2K/HD video and then output on both the HDMI and
the SDI outputs.
• Non-4K mode: If the format of input video is detected as non-4K video
source, e.g. 720p60, or the unit is configured by Mini-Config, 4K2HD will not
try to make 4K/UltraHD video from four video inputs. Instead, it will output
video to HDMI/SDI from the selected SDI input.
• Center Cut mode: 4K2HD will be in Center Cut mode if the input video is 4K/
UltraHD format, and the mode has been enabled through Mini-Config. In this
mode the 2K/HD center of 4K/UltraHD input video will be output to the HDMI
and SDI outputs. No down-scaling occurs, and the output format is either
1920x1080 or 2048x1080 (depending the input source and the 2K cropping
configuration).