SDA9410-B13 Datasheet, PDF (110/179 Pages) Micronas – Display Processor and Scan Rate Converter using Embedded DRAM Technology Units

SDA9410
Preliminary Data Sheet
Display processing
5.12.1 Peaking
The luminance peaking filter improves the over all frequency response of the luminance
channel. It consists of two filters working in parallel. They have high pass (HP) and band
pass (BP) characteristics. Their gain factors are separately programmable (I²C Bus
parameters BCOF 5Dh, HCOF 5Dh). The high pass and the band pass filters are
equipped with a common coring algorithm. It is optimized to achieve a smooth display of
grey scales, not to improve the signal-to-noise ratio. Therefore no artifacts are produced.
Coring can be switched off (I²C Bus parameter CORING, 5Ah). The figure below shows
the block diagram of the peaking block.
BCOF HCOF
BP
gain_bp
HP
gain_hp
CORING
PEAKING
Coring
YIN
Delay
YPEAK
Figure 53 Block diagram peaking
The transfer functions of the separate filters are listed below:
High pass Transfer function: HHP(z) = 1/16 (1-z ^-1)⁴
Band pass Transfer function: HBP(z) = - 1/8 (1-z ^-2)²
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Micronas