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PDF UPD64083 Data sheet ( Hoja de datos )
| Número de pieza | UPD64083 | |
| Descripción | 3 Dimensional Y/C Separation IC with On-Chip Memory | |
| Fabricantes | NEC | |
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NEW PRODUCTS 2
THREE-DIMENSIONAL Y/C SEPARATION IC WITH ON-CHIP MEMORY
µPD64083
Ikuo Hirama*
The µPD64083 is a single-chip NTSC 3-D
Y/C separation IC that achieves superior
TV picture quality by incorporating the
conventionally external 4 Mb frame
memory on the chip.
Introduction
The recent advent of flat-screen, LCD, and
PDP panel televisions has brought significant
increases in demand for larger screens with
higher resolution, and a higher screen quality to
match. A better picture quality than that provided
by the conventional terrestrial TV broadcasts
(NTSC signals) both in Japan and in North
America is being especially looked for due to
the arrival of high-picture-quality digital media,
such as the increasingly popular DVD video and
Japan’s BS Digital satellite TV service, which
started last year. Not limited to television,
demands for high-quality terrestrial NTSC
signals are also being felt in related fields, such
as high-picture-quality digital image recording
devices (DVD recorders, hard disk recorders)
and PCs that include TV functions.
The key to improving the picture quality of
NTSC signals is a high-precision Y/C separation
function. Most televisions employ two-
dimensional Y/C separation performed using
inter-line processing, but this kind of separation
invariably results in “cross color” (color noise
such as fine diagonal lines occurring in the
pattern) and “hanging dots” (network noise that
occurs on the edge of the color).
In order to solve these problems, NEC has
been developing and commercializing a range
of motion-adaptive 3-D Y/C separation ICs that
can be used to minimize cross color and hanging
dot noise.
Development Background
Almost all wide TVs and most 29-inch or over
4:3 TVs in the Japanese television market
incorporate a 3-D Y/C separation function, as
do most 30-inch or over and 50-inch class
projection TVs in the North American market.
Realizing that 3-D Y/C separation ICs are the
key device in these large-size televisions, NEC
Photo 1 NEC's 3-D Y/C Separation LSI with On-Chip Memory "µPD64083"
has focussed considerable development
resources in this area and has gained a reputation
from both television makers and end users for
providing products that are superior in terms of
functionality, performance and price: an effort
that has been rewarded with the achievement of
a 70% or more share in this market.
However, 3-D Y/C separation systems have
tended to be complex and expensive, due in part
to the necessity of providing memory to save
picture data on a frame-by-frame basis.
Moreover, the EDO DRAM that was
conventionally attached externally for this
purpose was a major source of noise, which then
had to be countered by even more complex board
design, resulting in even higher cost.
Against this background, NEC has now
developed the µPD64083, a new single-chip 3-
D Y/C separation IC that realizes high-precision
separation by incorporating on the chip the 4 Mb
memory that was conventionally attached
externally (Photo 1). With this new IC, users
can now create a high-picture-quality, noise-free
3-D Y/C separation system with little effort.
The development roadmap of NEC’s 3-D Y/
C separation ICs is shown in Figure 1.
Product Outline
This IC integrates on one chip all the functions
required for Y/C separation of terrestrial
broadcasts (NTSC signals) for high-picture-
quality TV, including a 2-channel 10-bit A/D
converter, clock generator, 2-channel 10-bit D/
A converter, I2C bus register, motion-adaptive
3-D Y/C separation, motion detection,
nonstandard detection, and frame recursive noise
reduction.
Figure 2 shows a block diagram of the
µPD64083.
Either a composite signal or separate signals
(S pin input) can be input as the input signal. If
the former is input, the 3-D Y/C separation
function can be used, and if the latter, the noise
reduction function can be used. Furthermore,
for a composite or luminance signal, not only is
the 10-bit A/D converter used, but the signals
are also processed internally in 10 bits, giving
this IC the industry’s highest grayscale
reproduction performance as a consumer TV
signal processor. The incorporation of a number
of additional functions, including vertical border
correction, horizontal peaking, coring, ID-1
signal detection, and noise detection, also makes
this IC unrivaled in terms of versatility.
Features
1. Single-chip system
Whereas previous 3-D Y/C separation systems
were made up of a number of different chips
(memory, etc.), the µPD64083 integrates all
these functions on a single chip. Now, all that
needs to be provided externally are several
discrete circuits such as a picture I/O circuit, 20
MHz crystal for clock generation,
*Digital Consumer Group, Sales Engineering Division (Published January 2002)
1 page | ||
| Páginas | Total 3 Páginas | |
| PDF Descargar | [ Datasheet UPD64083.PDF ] | |
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