Daewoo DTC-20T2, DTZ-29U7/U3, DTZ-2881/28W8 Features, Analogue Video Processing all versions

CP-520/520A/520F Service Manual

4.1.4FEATURES

Analogue Video Processing (all versions)

·Multi-standard vision IF circuit with alignment-free PLL demodulator

·Internal (switchable) time-constant for the IF-AGC circuit

·Switchable group delay correction and sound trap (with switchable centre frequency) for the demodulated CVBS signal

·DVB/VSB IF circuit for preprocessing of digital TV signals.

·Video switch with 3 external CVBS inputs and a CVBS output. All CVBS inputs can be used as Y-input for Y/C signals. However, only 2 Y/C sources can be selected because the circuit has 2 chroma inputs. It is possible to add an additional CVBS(Y)/C input (CVBS/YX and CX) when the YUV interface and the RGB/YPRPB input are not needed.

·Automatic Y/C signal detector

·Adaptive digital (4H/2H) PAL/NTSC comb filter for optimum separation of the luminance and the chrominance signal.

·Integrated luminance delay line with adjustable delay time

·Picture improvement features with peaking (with switchable centre frequency, depeaking, variable positive/negative peak ratio, variable pre-/overshoot ratio and video dependent coring), dynamic skin tone control, gamma control and blue- and black stretching. All features are available for CVBS, Y/C and RGB/YPBPR signals.

·Switchable DC transfer ratio for the luminance signal

·Only one reference (24.576 MHz) crystal required for the TCG m-Controller, digital sound processor, Teletext and the colour decoder

·Multi-standard colour decoder with automatic search system and various “forced mode” possibilities

·Internal base-band delay line

·Indication of the Signal-to-Noise ratio of the incoming CVBS signal

·Linear RGB/YPBPR input with fast insertion.

·YUV interface. When this feature is not required some pins can be used as additional RGB/YPBPR input. It is also possible to use these pins for additional CVBS (or Y/C) input (CVBS/YX and CX).

·Tint control for external RGB/YPBPR signals

·Scan Velocity Modulation output. The SVM circuit is active for all the incoming CVBS, Y/C and RGB/YPBPR signals. The SVM function can also be used during the display of teletext pages.

·RGB control circuit with ‘Continuous Cathode Calibration’, white point and black level off-set adjustment so that the colour temperature of the dark and the light parts of the screen can be chosen independently.

·Contrast reduction possibility during mixed-mode of OSD and Text signals

·Adjustable ‘wide blanking’ of the RGB outputs

·Horizontal synchronization with two control loops and alignment-free horizontal oscillator

·Vertical count-down circuit

·Vertical driver optimized for DC-coupled vertical output stages

·Horizontal and vertical geometry processing with horizontal parallelogram and bow correction and horizontal and vertical zoom

·Low-power start-up of the horizontal drive circuit

Analogue video processing (stereo versions)

·The low-pass filtered ‘mixed down’ I signal is available via a single ended or balanced output stage.

Analogue video processing (mono versions)

·The low-pass filtered ‘mixed down’ I signal is available via a single ended output stage

Digital Video Processing (some versions)

·Double Window mode applications. It is possible to display a video and a text window or 2 text

DTV R&D Europe 21