SAA7113H
Philips Semiconductors
9-bit video input processor
The SECAM processing contains the following blocks:
• Baseband ‘bell’ filters to reconstruct the amplitude and phase equalized 0° and 90°
FM signals
• Phase demodulator and differentiator (FM-demodulation)
• De-emphasis filter to compensate the pre-emphasized input signal, including
frequency offset compensation (DB or DR white carrier values are subtracted from the
signal, controlled by the SECAM switch signal).
The burst processing block provides the feedback loop of the chrominance PLL and
contains:
• Burst gate accumulator
• Color identification and color killer
• Comparison nominal/actual burst amplitude (PAL/NTSC standards only)
• Loop filter chrominance gain control (PAL/NTSC standards only)
• Loop filter chrominance PLL (only active for PAL/NTSC standards)
• PAL/SECAM sequence detection, H/2-switch generation
• Increment generation for DTO1 with divider to generate stable subcarrier for
non-standard signals.
The chrominance comb filter block eliminates crosstalk between the chrominance
channels in accordance with the PAL standard requirements. For NTSC color standards
the chrominance comb filter can be used to eliminate crosstalk from luminance to
chrominance (cross-color) for vertical structures. The comb filter can be switched off if
desired. The embedded line delay is also used for SECAM recombination (cross-over
switches).
The resulting signals are fed to the variable Y-delay compensation and the output
interface, which contains the VPO output formatter and the output control logic
(see Figure 10).
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© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 02 — 9 May 2005
12 of 75
NXP [ NXP ]
