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PDF VPC3242D Data sheet ( Hoja de datos )

Número de pieza VPC3242D
Descripción Comb Filter Video Processor
Fabricantes Micronas 
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MICRONAS
ADVANCE INFORMATION
VPC323xD,
VPC324xD
Comb Filter Video
Processor
Edition Jan. 19, 1999
6251-472-1AI
MICRONAS

1 page




VPC3242D pdf
ADVANCE INFORMATION
VPC 323xD, VPC 324xD
Comb Filter Video Processor
1. Introduction
The VPC 323xD/324xD is a high-quality, single-chip
video front-end, which is targeted for 4:3 and 16:9, 50/
60 and 100/120 Hz TV sets. It can be combined with
other members of the DIGIT3000 IC family (such as
DDP 33x0A/B, TPU 3040) and/or it can be used with
3rd-party products.
The main features of the VPC 323xD/324xD are
– high-performance adaptive 4H comb filter Y/C sepa-
rator with adjustable vertical peaking
– multi-standard color decoder PAL/NTSC/SECAM
including all substandards
– four CVBS, one S-VHS input, one CVBS output
– two RGB/YCrCb component inputs, one Fast Blank
(FB) input
– integrated high-quality A/D converters and associ-
ated clamp and AGC circuits
– multi-standard sync processing
– linear horizontal scaling (0.25 ... 4), as well as
non-linear horizontal scaling ‘panorama vision’
– PAL+ preprocessing (VPC 323xD)
– line-locked clock, data and sync, or 656-output inter-
face (VPC 323xD)
– display and deflection control (VPC 324xD)
– peaking, contrast, brightness, color saturation and
tint for RGB/ YCrCb and CVBS/S-VHS
– high-quality soft mixer controlled by Fast Blank
PIP
processing
for
four
picture
sizes
(1--,
4
-1-,
9
--1----,
16
or
-1--
36
of
normal size) with 8 bit resolution
– 15 predefined PIP display configurations and expert
mode (fully programmable)
– control interface for external field memory
– I2C-Bus Interface
– one 20.25 MHz crystal, few external components
– 80-pin PQFP package
1.1. System Architecture
Fig.1–1 shows the block diagram of the video proces-
sor
CIN
VIN1
VIN2
VIN3
VIN4
VOUT
RGB/
YCrCb
FB
RGB/
YCrCb
Analog
Front-end
AGC
2 × ADC
Adaptive
Comb
Filter
NTSC
PAL
Color Y
Decoder
NTSC
PAL
SECAM
Saturation
Tint
Cr
Cb
Mixer
Y 2D Scaler
PIP
Cr Panorama
Mode
Cb Contrast
Brightness
Peaking
Output
Formatter
ITU-R 656
ITU-R 601
Memory
Control
Y/G
Analog
Component U/B
Front-End
V/R
4 x ADC FB
Processing
Matrix
Contrast
Saturation
Brightness
Tint
Y
Cr
Cb
FB
I2C Bus
Clock
Gen.
Sync
+
Clock
Generation
Y OUT
CrCb
OUT
YCOE
FIFO
CNTL
LL Clock
H Sync
V Sync
AVO
Fig. 1–1: .Block diagram of the VPC 323xD
Micronas
20.25 MHz I2C Bus
5

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VPC3242D arduino
ADVANCE INFORMATION
VPC 323xD, VPC 324xD
color killer operation; they are used for automatic stan-
dB dard detection as well.
PAL/NTSC
dB
2.3.6. Color Killer Operation
The color killer uses the burst-phase/burst-frequency
measurement to identify a PAL/NTSC or SECAM color
signal. For PAL/NTSC, the color is switched off (killed)
as long as the color subcarrier PLL is not locked. For
SECAM, the killer is controlled by the toggle of the
MHz burst frequency. The burst amplitude measurement is
used to switch-off the color if the burst amplitude is
below a programmable threshold. Thus, color will be
killed for very noisy signals. The color amplitude killer
has a programmable hysteresis.
SECAM
MHz
Fig. 2–5: Frequency response of chroma filters
2.3.4. Frequency Demodulator
The frequency demodulator for demodulating the SE-
CAM signal is implemented as a CORDIC-structure. It
calculates the phase and magnitude of the quadrature
components by coordinate rotation.
The phase output of the CORDIC processor is differ-
entiated to obtain the demodulated frequency. After
the deemphasis filter, the Dr and Db signals are scaled
to standard CrCb amplitudes and fed to the cross-
over-switch.
2.3.5. Burst Detection / Saturation Control
In the PAL/NTSC-system the burst is the reference for
the color signal. The phase and magnitude outputs of
the CORDIC are gated with the color key and used for
controlling the phase-lock-loop (APC) of the demodula-
tor and the automatic color control (ACC) in PAL/NTSC.
The ACC has a control range of +30 ... –6 dB.
Color saturation can be selected once for all color
standards. In PAL/NTSC it is used as reference for the
ACC. In SECAM the necessary gains are calculated
automatically.
For SECAM decoding, the frequency of the burst is
measured. Thus, the current chroma carrier frequency
can be identified and is used to control the SECAM
processing. The burst measurements also control the
2.3.7. Automatic standard recognition
The burst-frequency measurement is also used for
automatic standard recognition (together with the sta-
tus of horizontal and vertical locking) thus allowing a
completely independent search of the line and color
standard of the input signal. The following standards
can be distinguished:
PAL B,G,H,I; NTSC M; SECAM; NTSC 44; PAL M;
PAL N; PAL 60
For a preselection of allowed standards, the recogni-
tion can be enabled/disabled via I2C bus for each stan-
dard separately.
If at least one standard is enabled, the VPC32xxD
checks regularly the horizontal and vertical locking of
the input signal and the state of the color killer. If an
error exists for several adjacent fields a new standard
search is started. Depending on the measured line
number and burst frequency the current standard is
selected.
For error handling the recognition algorithm delivers
the following status information:
– search active (busy)
– search terminated, but failed
– found standard is disabled
– vertical standard invalid
Micronas
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