Datasheet

TVP5150AM1

www.ti.com

SLES209E–NOVEMBER 2007– REVISED OCTOBER 2011

3.5 Luminance Processing

The luminance component is derived from the composite signal by subtracting the remodulated

chrominance information. A line delay exists in this path to compensate for the line delay in the adaptive

comb filter in the color processing chain. The luminance information is then fed into the peaking circuit,

which enhances the high frequency components of the signal, thus improving sharpness.

3.6 Chrominance Processing

For NTSC/PAL formats, the color processing begins with a quadrature demodulator. The Cb/Cr signals

then pass through the gain control stage for chrominance saturation adjustment. An adaptive comb filter is

applied to the demodulated signals to separate chrominance and eliminate cross-chrominance artifacts.

An automatic color killer circuit is also included in this block. The color killer suppresses the chrominance

processing when the burst amplitude falls below a programmable threshold (see I

C subaddress 06h). The

SECAM standard is similar to PAL except for the modulation of color which is FM instead of QAM.

3.7 Timing Processor

The timing processor is a combination of hardware and software running in the internal microprocessor

that serves to control horizontal lock to the input sync pulse edge, AGC and offset adjustment in the

analog front end, vertical sync detection, and Macrovision detection.

3.8 VBI Data Processor (VDP)

The TVP5150AM1 VDP slices various data services such as teletext (WST, NABTS), closed captioning

(CC), wide screen signaling (WSS), etc. These services are acquired by programming the VDP to enable

standards in the VBI. The results are stored in a FIFO and/or registers. The teletext results are stored only

in a FIFO. Table 3-1 lists a summary of the types of VBI data supported according to the video standard. It

supports ITU-R BT. 601 sampling for each.

Table 3-1. Data Types Supported by VDP

LINE MODE REGISTER

NAME DESCRIPTION

(D0h–FCh) BITS [3:0]

0000b WST SECAM Teletext, SECAM

0001b WST PAL B Teletext, PAL, System B

0010b WST PAL C Teletext, PAL, System C

0011b WST, NTSC B Teletext, NTSC, System B

0100b NABTS, NTSC C Teletext, NTSC, System C

0101b NABTS, NTSC D Teletext, NTSC, System D (Japan)

0110b CC, PAL Closed caption PAL

0111b CC, NTSC Closed caption NTSC

1000b WSS/CGMS-A Wide-screen signaling/Copy Generation Management System-Analog, PAL

1001b WSS/CGMS-A Wide-screen signaling/Copy Generation Management System-Analog, NTSC

1010b VITC, PAL Vertical interval timecode, PAL

1011b VITC, NTSC Vertical interval timecode, NTSC

1100b VPS, PAL Video program system, PAL

1101b Gemstar 2x Custom 1 Electronic program guide

1110b Reserved Reserved

1111b Active Video Active video/full field

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