TMC22X5YA datasheet(42/84 Pages) FAIRCHILD

Part #	TMC22X5YA

Description	Multistandard Digital Video Decoder Three-Line Adaptive Comb Decoder Family, 8 & 10 bit

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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TMC22x5yA

PRODUCT SPECIFICATION

42

REV. 1.0.0 2/4/03

phase relationship to the chroma on 1H. Therefore normally

0H and 2H are added together to produce the average luma

across 3 lines and this is then subtracted from 1H to produce

the combed chroma.

Figure 7. Chrominance Vector Rotation in PAL and NTSC

YC Line-Based Comb Filters

The luminance and chrominance signals, are by deﬁnition,

already separated for YC inputs. However, if the original

source was composite, there is a distinct possibility that there

is some residual luminance (cross color) in the chrominance

signal and some residual chrominance (cross luma) in the

luminance signal. It is therefore legitimate to treat these

signals as if they were simply the output from bandsplit

ﬁlters and process the luma and chroma signals accordingly.

D1 Line-Based Comb Filters

A D1 data stream consists of multiplexed Y, CB and CR

component data. If the original source was composite there

maybe luminance (cross color) in CBCR and chrominance

(cross luma) in Y. In the ﬁrst case any luminance that was

passed through a demodulator along with the chroma to

produce the baseband CBCR color difference signals would

have the same characteristics as chroma. That is to say, the

cross color would advance by 180

° every line in NTSC and

every 2 lines in PAL. It is therefore possible to remove this

cross color in a comb ﬁlter. In the latter case any chromi-

nance that is still in the Y data can obviously be removed in a

comb ﬁlter as well.

The original source for the D1 signal could also have been

computer graphics. In this case, the comb ﬁlter can be used

to remove the picture ﬂicker and convert the output to RGB.

NTSC Frame and Field Based

Decoders

Composite Frame-Based Comb Filters

In NTSC the chrominance vectors advance by 180 degrees

every line, therefore after 525 lines the 2 adjacent frame lines

0H and FR0H and the two consecutive ﬁeld lines FR0H and

FR1H are 180 degrees apart. The ﬂat color on FR0H and

FR1H can be added or subtracted to provide the luminance

or chrominance to subtract from 0H.

Figure 8. Chrominance Vector Rotation Over 4

Fields in NTSC

Composite Field-Based Comb Filters

In NTSC ﬁeld based comb decoders, there is an external

delay of 263 lines, therefore the 2 adjacent picture lines 0H

and F0H and the two consecutive ﬁeld lines F0H and F1H

are 180 degrees apart. The ﬂat color on F0H and F1H can be

added or subtracted to provide the luminance or chromi-

nance to subtract from 0H.

PAL Field Decoders

Composite, PAL Field Comb Filters

In PAL ﬁeld based comb decoders, there is an external delay

of 312 lines, therefore the 2 adjacent picture lines 0H and F0H

are 180 degrees apart. In ﬁelds 5, 6, 7, and 8 the U and V

vectors are 180 degrees advanced from ﬁelds 1, 2, 3, and 4.

Figure 9. Chrominance Vector Rotation

Over 4 Fields in PAL

PAL

NTSC

LINE no

V

U

V

U

Q

I

V

U

V

U

V

U

N+1

N

N+2

N+3

N+4

M

M+1

M+2

M+3

2H

1H

0H

65-22x5y-48

FIELD

0

1

LINE no

Q

I

22

21

23

24

283

284

285

286

FIELD 1

FIELD 2

FIELD 3

FIELD 4

(1H)

(0H)

(F1H)

(F0H)

(FR1H)

(FR0H)

65-22x5y-49

V

U

V

U

V

U

V

U

V

U

24

23

25

26

336

337

338

65-22x5y-50

LINE no

FIELD 1

FIELD 2 FIELD 3 FIELD 4

(0H)

(F0H)

(FR0h)

(FR0H)

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