SAA7129H NXP Semiconductors, SAA7129H Datasheet - Page 11

• Manufacturer Part Number: SAA7129H
• Manufacturer: NXP Semiconductors

Specifications of SAA7129H

• Adc/dac Resolution: 10b
• Screening Level: Commercial
• Package Type: PQFP
• Pin Count: 44
• Lead Free Status / RoHS Status: Compliant

Philips Semiconductors
9397 750 14325
Product data sheet
7.3.3 Video Programming System (VPS) encoding
7.3.4 Closed caption encoder
7.3.5 Anti-taping (SAA7128H only)
7.4 RGB processor
7.5 SECAM processor
TTXRQ provides a fully programmable request signal to the teletext source, indicating the
insertion period of bitstream at lines which are selectable independently for both fields.
The internal insertion window for text is set to 360 (PAL-WST), 296 (NTSC-WST) or 288
(NABTS) teletext bits including clock run-in bits. The protocol and timing are illustrated in
Figure
Five bytes of VPS information can be loaded via the I
appropriate format into line 16.
Using this circuit, data in accordance with the specification of closed caption or extended
data service, delivered by the control interface, can be encoded (line 21). Two dedicated
pairs of bytes (two bytes per field), each pair preceded by run-in clocks and framing code,
are possible.
The actual line number where data is to be encoded in, can be modified in a certain range.
The data clock frequency is in accordance with the definition for NTSC-M standard
32 times horizontal line frequency.
Data LOW at the output of the DACs corresponds to 0 IRE, data HIGH at the output of the
DACs corresponds to approximately 50 IRE.
It is also possible to encode closed caption data for 50 Hz field frequencies at 32 times
horizontal line frequency.
For more information contact your nearest Philips Semiconductors sales office.
This block contains a dematrix in order to produce red, green and blue signals to be fed to
a SCART plug.
Before Y, C
difference signals and 2 times oversampling for luminance and 4 times oversampling for
color difference signals is performed. The transfer curves of luminance and color
difference components of RGB are illustrated in
SECAM specific pre-processing is achieved by a pre-emphasis of color difference signals
(for gain and phase see
A baseband frequency modulator with a reference frequency shifted from 4.286 MHz to
DC carries out SECAM modulation in accordance with appropriate standard or optional
wide clipping limits.
After HF pre-emphasis, line-by-line sequential carriers with black reference of 4.25 MHz
(Db) and 4.40625 MHz (Dr) are generated on a DC reference carrier (anti-Cloche filter;
see
Figure 16
23.
B
and C
and
Figure
R
signals are de-matrixed, individual gain adjustment for Y and color
Rev. 03 — 9 December 2004
Figure 14
17) using specified values for FSC programming bytes.
and
Figure 15
SAA7128H; SAA7129H
Figure 12
respectively).
2
C-bus and will be encoded in the
and
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Figure 13
Digital video encoder
respectively.
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