Samsung DVD-R130, Service Manual, Page: 113 / 130

Circuit Operating Descriptions
Samsung Electronics 13-11
13-4-5 NTSC/PAL Video Decoder (TW9909 : Video Decoder)
The TIC1 (Video Decoder : TW9909) device is a high quality, single-chip digital video decoder that digitizes and
decodes all popular baseband analog video formats into digital component video. The TIC1 (Video Decoder
:TW9909) supports the analog-to-digital (A/D) conversion of component RGB and YPbPr signals, as well as the
A/D conversion and decoding of NTSC, PAL and SECAM composite and S-video into component YCbCr.
This TIC1 (Video Decoder : TW9909) includes four 10-bit 30-MSPS A/D converters. and A/D conversion of 10bit
analog Video signal converted into Digital Video signal (ITU-R656 Format) is outputted via DIC1 (MPEG2
Decoder & Encoder with video Encoder) of digital part.
The following output formats supply 10-bit 4:2:2 YCbCr to the DIC1 (MPEG2 Decoder & Encoder with video
Encoder) of digital part.
On CVBS and S-video inputs, the user can control video characteristics such as contrast, Brightness, saturation,
and hue via an I2C DIC1 port [PIN V17, V18] interface.
The TW9909 decoder includes methods for advanced vertical blanking interval (VBI) data retrieval. The VBI data
processor (VDP) slices, parses, and performs error checking on teletext, closed caption (CC), Copy Guard Detect
Processing and other VBI data.
13-4-6 Amplifier (MM1623)
VIC1 is 6dB amplifier.
Based on CVBS signal, the final output level must be 2Vpp without 75ohm terminal resistance.
Because the level of video encoder output is only 1Vpp, the level is adjusted with the special amplifier.
When mute of pin 3 is high active, if the pin is floating and connect to power, the output signal is never out-
putted.
CVBS, Y, C, Y(R), Cb(B), Cr(R) outputted from video encoder are inputted to VIC1 [Pin4, 6, 2, 10, 12, 14] respec-
tively.
The signal to which gain is adjusted by amplifier is outputted from jack via 75ohm Resistance
(VR14, 15, 16, 23, 12, 13).