Q-67107-H5237 데이터 시트보기 (PDF) - Micronas

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Q-67107-H5237

PRIMUS Powerful Scan Rate Converter including ultistandard Color Decoder

Micronas 

SDA 9402/02S(A31)

Preliminary Data Sheet 02.2001

System Description

5.1.5 Chroma Decoder

ACC

generator

bell filter

FM demod.

(cordic)

deemphase

filter

CVBSin

IF-prefilter

SECAM

only

PAL/NTSC/

SECAM

filter

subsampling

chroma

filter

chroma

filter

burstakku

SECAM

H/2 switch

PAL

SECAM in

PAL/NTSC in

colorkiller

loop filter

PAL/SECAM

delay line

lock

detection

UVout

PAL/NTSC

only

sin/cos

rom

DTO

identifi-

cation

Figure 5-6 Chroma decoding overview

The digital multistandard chroma decoder is able to decode NTSC and PAL signals with

a subcarrier frequency of 3.58MHz and 4.43MHz (PAL B1)/M/N/602), NTSC M/4.4) as

well as SECAM signals with automatic standard detection. Alternatively a standard can

be forced. The demodulation is done with a regenerated color-carrier. For use of non-

standard crystals or factory adjustment, the frequency of the free-running regenerated

subcarrier can be adjusted between +/-270 ppm via SCADJ. For this purpose the crystal

deviation (SCDEV) can be read out via I²C after chroma PLL locking (indicated by

SCOUTEN) and can be stored in mC ROM for SCADJ. For test purposes, CPLLOF

allows a loop opening of the chroma PLL

For adjustment to the specific operational area an automatic norm detection is

selectable. Available 50 Hz color standards are PAL B, PAL N and SECAM. Available

60 Hz color standards are NTSC M, PAL M, PAL60 and NTSC44. For each line standard,

one or more color standards can be chosen for automatic standard detection. In addition,

a standard can be forced as well. Within each line standard, the standard is detected by

consequently switching from one to another. This standard detection process can be set

to slow or fast behavior (LOCKSP). In slow behavior, 25 fields are used to detect the

standard, whereas 15 fields are used in fast behavior. If unsuccessful within this time

period the system tries to detect another standard. For SECAM detection, a choice

between different recognition levels is possible (SCMIDL, SCMREL) and the evaluated

burst position is shiftable (BGPOS).

Color standard (STDET), line standard (LNSTDRD) and color killer status (CKSTAT)

can be read out.

1) PAL B is representative for PAL B/G/H/I/N

2) PAL60 and NTSC44 are nonstandard signals which are generated by some VCR or DVD player

Micronas

5-21

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