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參數(shù)資料
| 型號： | 935261351112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 顏色信號轉(zhuǎn)換 |
| 英文描述： | COLOR SIGNAL DECODER, PDIP32 |
| 封裝： | 0.400 INCH, PLASTIC, SOT-232, SDIP-32 |
| 文件頁數(shù)： | 46/47頁 |
| 文件大?。?/td> | 390K |
| 代理商： | 935261351112 |
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1996 Jan 17
8
Philips Semiconductors
Preliminary specication
I2C-bus controlled, alignment-free PAL/NTSC/SECAM
decoder/sync processor with PALplus helper demodulator
TDA9144
Colour decoder
The PAL/NTSC demodulator employs an oscillator that
can operate with either crystal (3.6 MHz or 4.4 MHz). If the
I2C-bus indicates that only one crystal is connected it will
always connect to the crystal on the reference crystal input
(pin 30). The Hue signal which is adjustable by I2C-bus, is
gated during the burst for NTSC signals.
The SECAM demodulator is an auto-calibrating PLL
demodulator which has two references. The reference
crystal, to force the PLL to the desired free-running
frequency and the bandgap reference, to obtain the
correct absolute value of the output signal. The VCO of the
PLL is calibrated during each vertical blanking period,
when the IC is in search mode or SECAM mode.
If the reference crystal is not 4.4 MHz the decoder will not
produce the correct SECAM signals. Especially for
PALplus and NTSC applications, an internal bypass mode
of the external baseband delay line (for instance
TDA4665) is added, controlled by bus bit BPS (bypass
mode) and has a gain of 2. The bypass mode is not
available for SECAM.
Comb lter interfacing
The frequency of the active crystal is fed to the Fscomb
output, which can be connected to an external comb filter
IC (e.g. SAA4961). When bus bit ECMB is LOW, the
subcarrier frequency is suppressed and its DC value is
LOW. With ECMB HIGH, the DC value is HIGH with the
subcarrier frequency present, and I2C-bus output bit YC
and the input switch are always forced in the Y/C mode,
unless an external current sink (e.g. from the comb filter)
prevents this, as pin Fscomb also acts as input pin. In this
event the subcarrier frequency is still present on the same
DC HIGH level
PALplus helper demodulation
PALplus has been introduced to come to an evolutionary
introduction of wide screen transmissions with backward
compatibility with PAL 4 : 3 TV sets. A PALplus signal has
the format of a standard analog PAL composite signal
containing 430 PAL picture lines in letter box format (lines
60 to 274 and 372 to 586), together with helper
information contained in the black bands above and below
the visible letter box area (lines 24 to 59, 336 to 371,
275 to 310, and 587 to 622).
A viewer with a 4 : 3 TV set will see a letter box picture:
black bars of 1
8 picture height at the top as well as at the
bottom with a 16 : 9 picture in between (see left-hand side
picture of Fig.4).
A wide screen viewer without PALplus decoder will only
see the centre picture of Fig.4, or the right hand side
picture when a zoom option is available, however with only
430 lines of vertical resolution.
When a wide screen viewer has a PALplus decoder, it
expands the letter box format to a full-size wide screen
picture with a vertical resolution of 574 lines. The decoder
uses the helper lines information, hidden within the black
bars. See the right-hand side picture of Fig.4.
Furthermore a PALplus signal will deliver full luminance
bandwidth by an Y/C separation technique called ‘Motion
Adaptive Colour Plus’ (MACP). Using this technique, the
signal becomes free from cross colour and cross
luminance. This algorithm requires MACP pre-processing
in the PALplus encoder at the studio output.
The PALplus parts which the TDA9144 processes are in
short:
Helper demodulation and multiplexing helper with letter
box luminance signal
Chrominance trap bypassing if necessary
Creation of reference line 22 (see Fig.5)
Creation of black set-up and helper set-up
Correct blanking and timing reference for the necessary
post processing ICs.
Fig.4 Possible PALplus picture displays.
handbook, full pagewidth
430
picture
lines
574
picture
lines
helper lines
MBG903
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