UPD64084 NEC, UPD64084 Datasheet - Page 22

• Manufacturer Part Number: UPD64084
• Description: THREE-DIMENSIONAL Y/C SEPARATION LSI WITH ON-CHIP MEMORY
• Manufacturer: NEC

8. NONSTANDARD SIGNAL DETECTION BLOCK
TV game signals, and Laser-Disc special playback signals. The detection result is used to stop inter-frame video
processing. (and selects intra-field video processing forcibly.)
8.1
f
serial bus. If the circuit detects a nonstandard signal, it stops using the frame comb filter. The detection result can be
read using OHSDF on the serial bus.
8.2
and f
be set. If the circuit detects a nonstandard signal, it stops using the frame comb filter, YNR, and CNR. The detection
result can be read using OVSDF on the serial bus.
8.3
such as a laser-disc special playback signal. The sensitivity of detection is set using LDSR on the serial bus. If the
circuit detects a nonstandard signal, it stops using the frame comb filter, YNR, and CNR. The detection result can be
read using LDSDF on the serial bus.
8.4
8.5
is set using WSCOR on the serial bus. The detection result can be read using WSL on the serial bus; it is not used in
the IC. The detection result can be processed in a microprocessor to find a weak electric field.
22
SC
This block detects nonstandard signals not conforming to the NTSC standard, such as VCR playback signals, home
The horizontal sync nonstandard signal detection circuit detects signals not having a standard relationship between
The vertical sync nonstandard signal detection circuit detects signals not having a standard relationship between f
The frame sync nonstandard signal detection circuit detects signals out of horizontal sync phase between frames,
It is possible to specify either forced standard or nonstandard signal control using NSDS on the serial bus.
The noise level detection circuit detects a noise level in the flat portion of a video signal. The sensitivity of detection
and f
V
signal
Video
input
Horizontal Sync Nonstandard Signal Detection
Vertical Sync Nonstandard Signal Detection
(f
Frame Sync Nonstandard Signal Detection
Forced Standard or Nonstandard Signal Control
Noise Level Detection
H
H
= 262.5f
(f
SC
= 227.5f
f
SC
V
) like a VCR special playback signal and home TV game signal. The sensitivity of detection cannot
trap
WSS
H
) like a VCR playback signal. The sensitivity of detection is set using VTRR and VTRH on the
separation
Sync
Figure 8-1. Nonstandard Signal Detection Block Diagram
WSC
counter
Coring
LDSR
VTRH
VTRR
HV
Data Sheet S16021EJ2V0DS
signal detection
signal detection
signal detection
Horizontal sync
nonstandard
Vertical sync
nonstandard
nonstandard
Noise level
Frame sync
detection
H: Nonstandard
signal detected
WSL
OVSDF
OHSDF
LDSDF
Forced standard or
nonstandard signal
Read register
NSDS
control
Mixer
Signal to stop using YNR, CNR,
Inter-frame processing control
and frame comb filter
PD64084
NSTD
LINE
H