ml86v7668 Oki Semiconductor, ml86v7668 Datasheet - Page 10

• Manufacturer Part Number: ml86v7668
• 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. The
digital decoded data that is output conforms with ITU-R BT.601.
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Chrominance Block
This block decodes chroma data to Cb/Cr data and performs level adjustment and color adjustment. To eliminate
unnecessary bands, this block first passes data through a bandpass filter (bypass is possible) and then through an
ACC correction circuit to maintain a stable chroma level, before performing UV decoding. The result of the UV
decoding is passed through a low-pass filter and output as a chrominance signal.
# Related registers: $46/CHRSC1, $47/CHSC2
OKI Semiconductor
Pixel Position Correction Function
Digital AGC Function
Image Quality Adjustment
YC1[6:4]
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 rate of the
luminance level. The default is automatically adjusted to sync level 40IRE, but the level can also be adjusted in
an internal register. In the digital MGC mode, the signal amplification rate 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 adjust function in the digital section, the input level
adjust function of the AMP in the analog section also operate separately.
# Related registers: $30/AGCC, $31/AGCRC, $32/SSEPL, $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.
Aperture bandpass filter, coring filter for contour compensation, and luminance pre-filter
# Related register: $35/LUMC4
*000
001
010
011
100
101
110
111
Note: AGC (Auto Gain Control), MGC (Manual Gain Control)
2-line/3-line adaptive transition filter
2-line/3-line adaptive comb filter
3-line comb/trap adaptive filter
NTSC Y/C separation
3-line comb filter
Undefined
Undefined
Undefined
Trap filter
2-line comb/trap adaptive transition filter
2-line/3-line adaptive comb filter
PAL Y/C separation
2-line comb filter
Undefined
Undefined
Undefined
Undefined
Trap filter
PEDL86V7668-01
ML86V7668
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