SDA9401 Datasheet, PDF (17/69 Pages) List of Unclassifed Manufacturers – Scan Rate Converter using Embedded DRAM Technology Units

SDA 9401
6.3.2 Horizontal compression
The horizontal compression compresses the incoming signal horizontally by a constant factor. For
the Y and UV signal the same filter characteristics are used. The horizontal compression can be
switched off.
The table below shows the relation between the parameter HDECON and the compression factor.
Input write parameter: HDECON
HDECON (1Ch)
00
01
10
11
no horizontal compression
factor 2
factor 4
not defined
The APPLIP (Active Pixels Per Line Input, see also chapter Input sync controller (ISC) on page 9)
value defines the length of an active line. Inside the SDA 9401 the number of active pixels per line is
APPL (Active Pixels Per Line) and its value depends on the chosen horizontal compression factor
HDECON. The table below explains the connection between APPL and APPLIP (see also chapter
Output sync controller (OSC) on page 29).
Connection between APPL and APPLIP
Mode
no horizontal compression (HDECON = ’00’)
horizontal compression, Factor 2 (HDECON = ’01’)
horizontal compression, Factor 4 (HDECON = ’10’)
MULTIPIC > ’0’ (dominant, see also chapter Multipicture display on
page 18)
APPL
APPLIP
(APPLIP + 1) / 2
(APPLIP + 3) / 4
45
Micronas
17
Preliminary Data Sheet