參數(shù)資料
型號: KS0125
廠商: SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述: Multi-standard Video Encoder(多標準視頻編碼器)
中文描述: 多標準視頻編碼器(多標準視頻編碼器)
文件頁數(shù): 17/36頁
文件大?。?/td> 561K
代理商: KS0125
MULTIMEDIA VIDEO
KS0125
PAGE 17 OF 36
ON-SCREEN-DISPLAY (OSD)
The On Screen Display (OSD) allows the user to Overlay characters over the video. The desired characters and
their positions are programmed on the display screen via the 8-bit micorprocessor interface. Figure 15 shows a
block diagram of the OSD. The OSD block consists of a character display buffer RAM,a character-generation font
ROM,character location generation,character boundary location generation and OSD shaping circuits. The Timing
Generator Pixel Counter and Line counter of the KS0125 generate controls to define the OSD display area.The
RAM address defines where the character will be displayed. The RAM data output acts as the pointer to select a
particular character from the Character font ROM. The character location generator converts the 12-bit character
font ROM outputs to serial character streams, while the boundary location generator creates a boundary to
surround the character. Finally,the OSD shaping circuits performs character color selection and background color
selection. The OSD CB,CR and Y outputs are properly shaped by band-limited filters to reduce the ringing caused
by the abrupt amplitude changes
.
Figure 12. On Screen Display Block Diagram
OSD Color Selection And Background Color Selection
The OSD supports four different colors for the character display and two different background colors. The color
select ion for the character and the background and the background are controlled by the programmable REGB
control register . Tables 1 and 2 describle the OSD color selection and background color selection.
Notics that the user is recommended to choose the color white for the OSD character, bacause the KS0125 creates
less flicking effect at the character boundary when white is chosen.
Table 1. OSD Character Color Selection
REGB
Color
Selection
Comments
BIT(6:5)
00
WHITE
Default, 80% Intensity
01
CYAN
80% Intensity, 60% Saturation
10
GREEN
80% Intensity, 60% Saturation
11
MEAENTA
80% Intensity, 60% Saturation
Timing
Generator
Line
Count
Pixel
Count
Display
Buffer
RAM
Data
Address
M
I
Character
Font
ROM
Boundary
Location
Generator
Character
Location
Generator
Color Select
Character
Boundary
OSD
Chaping
CR
CB
Y
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