Daewoo Dtf 2950 Service Manual

CP-850FX Service Manual 
 
Europe R&D 
50 pixels by subsampling. To prevent the introduction of alias distortion low pass filters are used for 
luminance and chrominance processing. The horizontal prescaler consists of two main 
subsampling stages. The first stage is a scaler for rational decimation factors in a range of 1 to 2. 
The second stage decimates in integer steps (1,2,3,4...32). 
 
5.3.1.8.2 Noise Reduction 
The structure of the temporal motion adaptive noise reduction is the same for luminance...

CP-850FX Service Manual 
 
Europe R&D 
51 5.4.2.3  Luma Contrast and Brightness 
The luminance signal is multiplied by a factor of 0...2 (contrast adjustment). The signal can be 
shifted by ±100% of its maximal amplitude with the digital brightness value 
 
5.4.2.4  Black Level Expander/Compressor (BLEC) 
The black level expander/compressor modifies the luminance signal with an adjustable non-
linear function to enhance the contrast of the picture. 
Dark areas are stretched to black, while bright areas...

CP-850FX Service Manual 
 
Europe R&D 
52 by over and undershoots at the chroma transition, the sharpened chroma signals are limited to a 
proper value automatically  
 
 
  
a) Cr Cb input of CTI 
b) Cr Cb input + correction signal 
c) sharpened and limited Cr Cb
 
 
 

CP-850FX Service Manual 
 
Europe R&D 
53 5.4.2.10  Analog Back End 
The digital RGB signals are converted to analogue RGB by three 10-bit digital to analogue 
converters (DAC). Each RGB signal has two additional DACs with 9-bit resolution to adjust 
analogue brightness (40% of the full RGB range) and cutoff / black level (60% of the full RGB 
range). An additional fixed current is applied for the blanking level. 
The back-end supports the insertion of two external analogue component signals, only one is...

CP-850FX Service Manual 
 
Europe R&D 
54 pass filtered with the according gain and time constant. The result is used to attenuate the RGB 
outputs by adjusting the white drive multipliers for the internal (digital) RGB signals, and the 
analog contrast multipliers for the analog RGB inputs, respectively. The lower limit of the 
attenuator is programmable, thus a minimum contrast can always be set. If the minimum contrast 
is reached, the brightness will be decreased to a programmable minimum as well....

CP-850FX Service Manual 
 
Europe R&D 
55 ƒ Attenuation Measurement and Compensation 
ƒ  Group Delay Measurement and Compensation 
ƒ  Exact Decoding of Echo Disturbed Signals 
 
 
5.5.3 PORTS 
ƒ  One 8-bit I/O-port with open drain output and optional I 2 C Bus emulation support (Port 0) 
ƒ  Two 8-bit multifunction I/O-ports (Port 1, Port 3) 
ƒ  One 4-bit port working as digital or analogue inputs for the ADC (Port 2) 
ƒ  One 2-bit I/O-port with secondary functions (P4.2, 4.3, 4.7) 
5.5.4 μ-CONTROLLER I/O...

CP-850FX Service Manual 
 
Europe R&D 
56 5.5.6 AUTOMATIC PICTURE FORMAT SWITCHING 
When AUTO mode is selected by the user, the television will automatically select the picture 
format for the user. If the user does not want to accept this selected format, he can always 
override the setting by use of the ZOOM control on the remote control. 
 
The received information used for automatic picture format control (only while AUTO is selected) 
is supplied from two sources; 
ƒ  By WSS data (Wide Screen...

CP-850FX Service Manual 
 
Europe R&D 
57 5.5.6.2  SCART Pin 8 Data (Slow Switching) 
When there is a signal from SCART 1 pin 8 or SCART 2 pin 8 (named the Slow Switching SSW 
signal) the TV will enter AV mode, unless the user forces another source (which is possible even 
though slow switching is present). 
 
 Aspect Switching Format  Name 
Position Ratio Voltage Level Tube 16:9 Tube 4:3 
CENTRE 4:3 HIGH 4:3 FULL SCREEN 
CENTRE 16:9 MEDIUM FULL SCREEN 16:9 
 
The SCART 1 signal SSW1 has priority over...

CP-850FX Service Manual 
 
Europe R&D 
58 FULL SCREEN  100%  100% Picture is displayed filling 
the full screen (width and 
height) Standard 16/9 
picture with 576 
active lines 
PANORAMA 
(not AUTO) 100% 100% Picture is displayed filling 
the full screen (width and 
height) by incorporating a 
non-linear horizontal 
geometrical error Used to fit a picture 
with 4:3 format on a 
16:9 screen by 
stretching the picture 
geometry at the 
borders 
FAVOURITE 
(not AUTO) 100% to 
133% 75% to 
100% Customised...

CP-850FX Service Manual 
 
Europe R&D 
59 5.5.7  EXTERNAL SOURCE CONTROL LOGIC 
The following schematic, illustrates the logic of control for the two SCART connectors. 
 
 
The terms used in the schematic are described below; 
 
1.  AUTO represents a situation where the television has self-selected its picture source. This 
could be when the SCART SLOW SWITCHING pin has gone to a high state, and the AV 1 
input is selected without the intervention of the user. 
2.  FORCED represents the change of source...