SDA9489X ETC [List of Unclassifed Manufacturers], SDA9489X Datasheet - Page 13

• Manufacturer Part Number: SDA9489X
• Description: PIP IV Advanced SOPHISTICUS High-End Picture-In-Picture ICs
• Manufacturer: ETC [List of Unclassifed Manufacturers]

SDA 9489X
SDA 9589X
4.2
Horizontal and vertical sync pulses are separated after elimination of the high frequency
components of the CVBS signal by a low pass filter. Horizontal sync pulses are
generated by a digital phase-locked-loop (DPLL). Its time constant is adjustable between
fast and slow behavior in four steps (PLLITC) to consider different input sources (e.g.
VCR). Noisy input signals become more stable when a noise-reduction is enabled
(NSRED). Additionally weak input signals from a satellite dish (’fishes’) become more
stable when SATNR is enabled. Both should be enabled to have best available
performance. When NOSIGB is enabled, a colored background is shown instead of the
picture when PIP is out of synchronization. The detected line standard is indicated by
SYNCSTAT.
4.3
The system is able to decode NTSC and PAL signals with a subcarrier of 3.58MHz and
4.43MHz (PAL B/M/N/60, NTSC M/4.4) as well as SECAM signals with 4.05/4.2MHz
subcarrier. The system may be forced to a certain standard, or an automatic standard
detection can be used (CSTAND). For automatic standard detection, some standards
which are not likely to be received can be ignored to improve the detection process.
Depending on the detected line standard (525 or 625 lines) the color standard detection
circuit searches for 60 Hz signals (NTSC-M / PAL-M / PAL 60 / NTSC44) or 50 Hz signals
(PAL-B / SECAM / PAL-N) respectively. Within each line standard, the standard is
detected by consequently switching from one to another. This standard detection
process can be set to medium or fast behavior (LOCKSP). In medium behavior 30 fields
(in fast 20) are used to detect the standard. If not being successful within this time period
the system tries to detect another one. For SECAM detection, a choice between two
recognition levels is possible (SCMIDL) and the evaluated burst position is selectable
(BGPOS).
.
Table 4-3
For getting the chrominance information the digitized video signal is multiplied with the
regenerated color subcarrier once in-phase and once phase-shifted by 90°. After
lowpass filtering digital UV is available for PAL and NTSC. The subcarrier is regenerated
Micronas
CSTANDEX
D1
0
0
1
1
.
D0
0
0
1
1
Inset Synchronization
Chroma Decoding And Standard Identification
Considered color standards for automatic standard detection
NTSC-
M
PAL60
PAL-N
PAL-M
PAL-B
Preliminary Data Sheet
System Description
SECAM
NTSC
44
4-13