STV0042 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
STV0042 Datasheet PDF : 37 Pages
| |||
STV0042/STV0056 APPLICATION NOTE
3 - APPLICATION NOTES
3.1 - Video Processing
Figure 3 and Figure 4 respectively give the architecture of the video processing part of the STV0042 and
STV0056 circuits.
Figure 3 : STV0042 Video Processing Block Diagram
LPF
NTSC
PAL
VIDEEM2/22kHz
13
VIDEEM1 UNCL DEEM
15
12
B-BAND IN 17
22kHz
TONE
G
±1
Baseband
Deemphasized
÷2
CLAMP IN
10 CLAMP
S2 VID RTN
8 CLAMP
STV0042
Normal
VCR / Decoder Return
+6dB
+6dB
6
S2 VID OUT
To Decoder or VCR
5
S1 VID OUT
To TV
Figure 4 : STV0056 Video Processing Block Diagram
I/O/22kHz 29
B-BAND IN 20
LPF
NTSC
PAL
VIDEEM2/22kHz
16
VIDEEM1 UNCL DEEM
18
15
22kHz
TONE
G
±1
Baseband
Deemphasized
÷2
CLAMP IN
13 CLAMP
S3 VID RTN
5 CLAMP
S2 VID RTN 11 CLAMP
S1 VID RTN
4 CLAMP
STV0056
Normal
Decoder Return
VCR Return
TV Return
BLACK LEVEL
ADJUST
+6dB +6dB +6dB
789
S3 VID OUT
S2 VID OUT
To Decoder
To VCR
To TV
Basically those block diagrams contain two mains parts : the baseband video processing an a switching
matrix.
4/37
Share Link: 