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Scan Rate Converter (SRC)
The 1H YUV signal is sent to the Matrix switch (U32201) from the YUV switching IC. Gemstar OSD is switched in at U32201 and both signals are sent to the digital decoder. The digital decoder takes the resulting YPrPb signal from the Matrix switch, digitizes it, and formats it into a CCIR656 data stream. The decoder is sync master and provides horizontal and vertical signals to the Gemstar module. The digitized video and sync signals are passed to the de-interlace IC. This IC examines the incoming video data (storing fields at a time), and determines the best way of creating the interpolated lines. If there is no motion detected, the system repeats the previous field's information to provide a complete frame of non-moving video. If motion is detected, vertical/temporal filtering is applied to the lines and fields around the interpolated line to provide a best-case line. The resulting 2H scan-rate digital video is then fed to a triple DAC for conversion to an analog signal.

Gemstar OSD
H/V Sync

1H Y U V

Matrix Switch U32201
2H Y Pr Pb

Digital Decoder U32251

CCIR656 Digital Data

DAC U32501 RGB/YPrPb Switching U38200

Deinterlacer U32301

SGRAM U32302

2H Y Pr Pb

Film Mode Controler U32401