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PDF TDA9170 Data sheet ( Hoja de datos )
| Número de pieza | TDA9170 | |
| Descripción | YUV picture improvement processor based on histogram modification | |
| Fabricantes | NXP Semiconductors | |
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Philips Semiconductors
YUV picture improvement processor based
on histogram modification
Preliminary specification
TDA9170
FEATURES
• Picture content dependent non-linear Y and U, V
processing by histogram analysis
• Adaptive and variable gamma correction controls
• Black and white stretch capabilities
• Transparent I2C-bus control
• On-chip window generator for valid histogram
measurement and black detection.
GENERAL DESCRIPTION
The TDA9170 is a transparent analog video processor
with a YUV interface. It offers three main luminance
processing functions any combination of which can be
selected.
The luminance transfer is controlled in a non-linear
manner by the distribution (in 5 discrete histogram
sections) of the luminance values measured in a picture.
As a result, the contrast ratio of the most important parts of
the picture will be improved.
Black restoration is available in the event of a set-up in the
luminance signal. A variable gamma function, after the
histogram conversion, offers the possibility of excellent
brightness control.
To maintain a proper colour reproduction, the saturation of
the U and V colour difference signals are controlled as a
function of the actual non-linearity in the luminance
channel.
The TDA9170 concept has maximum flexibility with the
optional on-board I2C-bus (including hardwired address
select) and window control. The supply voltage is 8 V. The
device is mounted in a 32 pin SDIP envelope.
ORDERING INFORMATION
TYPE NUMBER
TDA9170
NAME
SDIP32
PACKAGE
DESCRIPTION
plastic shrink in-line package; 32 leads (400 mil)
VERSION
SOT232-1
October 1994
2
1 page  
Philips Semiconductors
YUV picture improvement processor based
on histogram modification
Preliminary specification
TDA9170
ADAPTIVE WHITE-POINT STRETCHING
For dominant HM4 and HM5 voltages or large white parts
the histogram conversion procedure makes a transfer with
large gain in the white parts. However, the amount of light
being emitted from the picture is considerably reduced.
The white stretcher introduces additional overall gain for
increased light production and, as a result, violates the
principle of having a full-scale reference.
STANDARD DEVIATION
For pictures in which segments of the histogram
distribution are very dominant, with respect to the others,
the non-linear amplification should be reduced to
compensate for pictures with a flat histogram distribution.
The standard deviation detector measures the spread of
the histogram distribution in the segments HM1 to HM5
and modulates the user setting of the non-linear amplifier.
Non-linear amplifier
The stored segment voltages, relative to their average
value and averaged over two fields, determine the
individual gain of each segment in such a way that
continuity is guaranteed for the complete range. The
maximum and minimum gain of each segment is limited.
Apart from the adaptive white-point stretching the black
and white references are not affected by the non-linear
processing. The amount of linearity can be controlled
externally at AMPNLA (pin 3) or via the I2C-bus.
Variable gamma function
As well as the histogram conversion, a variable gamma
function can be applied to ensure excellent brightness
control. It is intended as an alternative to the DC-offset of
the classic brightness user control; it maintains the black
and white references. The gamma ranges from 0.5 to 1.5.
The gamma can be set externally at VARGAM (pin 2) or
via the I2C-bus.
Timing generator
The TDA9170 is equipped with a transparent internal
timing generator for window purposes. As a timing
reference the relevant sandcastle (SC) can be used. The
window enables the black measurement and the
histogram measurement circuitry. The internal timing
generator is basically intended for system invariant
operation. The default window handles all existing norms
and disables measurement in subtitles or logos. This
default window is preset at power-up and can be selected
with a logic HIGH level at the default window select DWS
(pin 1). If not selected the blanking of the sandcastle will
define the window borders.
However, using the I2C-bus and setting the WD1 and WD2
control bits (see Table 3), the window format can also be
user-programmed. The horizontal window generator
synchronizes on the rising edge of the burst key/clamp key
of the external sandcastle reference with an adjustable
window start and stop delay. The vertical window
generator synchronizes on the falling edge of the first burst
key/clamp key after a field pulse recognition.
I2C-bus specification
The I2C-bus is designed for transparent use. At power-up
all registers are preset for system invariant and external
control. All pins related to the I2C-bus can be left
open-circuit when the I2C-bus is in the standby mode. If
the sleep mode bit in the control register is set all settings
are left to bus control. For the relevant registers and
addresses see Tables 2 to 8.
Colour compensation
Non-linear luminance processing influences the colour
reproduction, mainly the colour saturation. Therefore, U
and V signals are also processed for saturation
compensation. The U and V input signals are clamped
during the logic HIGH period of the clamp which is defined
by the sandcastle reference and should be DC decoupled
with external capacitors.
October 1994
6
5 Page 
Philips Semiconductors
YUV picture improvement processor based
on histogram modification
Preliminary specification
TDA9170
SYMBOL
PARAMETER
CONDITIONS
Processing of measured histogram values
ADAPTIVE GAMMA CONTROL RANGE
Gadg(min)
Gadg(max)
minimum gain for HM1
maximum gain for HM1
ADAPTIVE GAMMA SETTING ADGAM (PIN 4); note 3; see Fig.8
Vadg(l)
Vadg(h)
IibADG
Gadp(min)
Gadp(max)
control voltage lower limit
control voltage upper limit
input bias current
minimum gain for HM1
maximum gain for HM1
no offset; GVAR = 1
no offset; GVAR = 1
ADAPTIVE GAMMA BY BLACK OFFSET
Gadb(min)
Gadb(max)
minimum gain for HM1
maximum gain for HM1
no offset; GVAR = 1
maximum offset;
GVAR = 1
WHITE-POINT STRETCH
Gwp maximum gain luminance for HM-pattern = 01103:
white stretch
Gnl = 1
Non-linear amplifier
NON-LINEAR GAIN SET BY HMX (PINS 16 TO 20)
Qnl(b)
Gnl(min)
Gnl(max)
segment bleeder accuracy
minimum gain segment
maximum gain segment
HM-pattern = 31100:
Gnl = 1
HM-pattern = 31100:
Gnl = 1
NON-LINEARITY SETTING AMPNLA (PIN 3); note 3
Vnl(l)
Vnl(h)
Iib(nl)
control voltage lower limit
control voltage upper limit
input bias current
DYNAMICS
td(nl) delay between linear and
non-linear path
Variable gamma
VARIABLE GAMMA CONTROL RANGE
GVAR(min)
minimum variable gamma
setting
GVAR(max)
maximum variable gamma
setting
MIN.
TYP.
MAX. UNIT
−1−
−3−
− 1.75 − V
− 3.25 − V
− − 0.1 µA
−1−
−3−
−1−
− 2.5 −
− 1.09 −
−−2%
− 0.36 −
− 2.28 −
− 1.75 − V
− 3.25 − V
− − 0.1 µA
− − 20 ns
− 0.5 −
− 1.5 −
October 1994
12
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet TDA9170.PDF ] | |
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