Zenith IQC50H94 Technical Training Manual - Appendix 1
Appendix 1
94
Zenith D3 Flexcoverter Description
Analog TVs use interlaced scanning and Digital TVs use progressive scan. The 94/95 series TVs are
Digital TVs, so therefore they use progressive scan.
Zeniths new D3 FLEXCONVERTER allows the 94/95 Series TVs to accept and display NTSC signal
sources plus all ATSC digital to analog converted signal sources. The flexconverter looks at the signal
coming into the TV set and converts it to best fit the TVs display area or allows it to pass through unaf-
fected. Thus, the very best possible picture can be displayed on the screen from any signal source. The new
D3 Flexconverter is smart enough make the input source signal best fit the 4:3 display aspect ratio of the 94/
95 series RPTVs, since it must make the proper display decision it is much more than a line doubler; it is a
video processor. A line-doubled picture would simply be compressed in the 16:9 format thus causing the
lines to thicken, overlap and distort the picture.
In Diagram A, a DTV signal of 4:3 and 480p is allowed to pass through unaffected, since 480p is the native
format for the 95/95 series RPTV. A standard broadcast or cable signal at 270i will be processed by the
D3 Flexconverter and upconverted to be displayed at 1080i in a 4:3 aspect ratio. The 480i signal from a
converted digital to analog source such as a DVD or DBS is processed and converted to 480p.
In Diagram B, the DTV signals output by a digital STB of 480i, 480p and 720p with an aspect ratio of 16:9
are changed to 480p, but, as a result of the smaller vertical displayed image size of the 16:9 picture, the
actual viewable scan lines are 360p AVSL (Active Video Scan Lines).
In Diagram C, the 16:9 by 1080i is processed and displayed at 810i in the vertically compressed picture
image area of the 4:3 screen. The 810i of AVSL meets the CEA requirements to be labeled HDTV Monitor
(HD Capable).
So therefore, the NEW D3 Flexconverter makes the 94/95 series RPTVs perform at optimum levels on
either analog or D to A converted signals.