ml86v7668a Oki Semiconductor, ml86v7668a Datasheet - Page 10

• Manufacturer Part Number: ml86v7668a
• Description: Ntsc/pal/secam Digital Video Decoder
• Manufacturer: Oki Semiconductor

Luminance Block
The luminance block removes sync signals from the luminance data after Y/C separation, and performs
adjustments such as luminance level adjustment and luminance image quality correction and adjustment. Digital
decoded data that conforms to ITU-R BT.601 can be output.
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OKI Semiconductor
Pixel Position Correction Function
Digital AGC Function
Image Quality Adjustment
This function corrects sampling error in asynchronous sampling and loss of PLL synchronization. Error
correction is made in the horizontal direction, which improves vertical line jitter on the screen.
# Related register: $22/SYNC3
This function adjusts the output level of luminance signals.
Adjustment is automatically performed by the digital AGC, but the adjustment can also be set manually by
using an internal register to set digital MGC. In the digital AGC mode, the sync level is compared with a
reference value to determine the amplification ratio of the luminance level. The default is automatically
adjusted to sync level 40IRE, but the level can also be adjusted by an internal register. In the digital MGC mode,
the signal amplification ratio and the black level are adjusted with register settings. The black level is adjusted
by means of pedestal level adjustment.
Regarding the AGC function, in addition to the output level adjustment function in the digital section, the input
level adjustment function of the AMP in the analog section also operate separately.
# Related registers: $30/AGCC, $31/AGCRC, $37/LOFLC, $36/CLC
The following image filters are provided for adjusting luminance image quality.
Refer to the User's Manual for the characteristics of each filter.
- Edge enhancement pre-filter
This filter is for enhancing the edge of a luminance signal
The two filters of a pre-filter and a sharp filter operate simultaneously.
# Related register: $35/LUMC4[7]
- Aperture bandpass filter and coring filter that are used for contour compensation
These filters are adjusted using the following registers:
- For setting the aperture band-pass filter coefficient:
# Related register: $35/LUMC4[6:5]
- For setting the range of coring
# Related registers: $35/LUMC4[4:3]
- For setting aperture weight
# Related register: $35/LUMC4[2:0]
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